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robertbroadwelljr
Joined: 26 Oct 2010
Posts: 1
Location: cHAPIN, SC
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 Posted: Wed Nov 17, 2010 9:03 pm Post subject: Rotax 912 throttle return springs |
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I have a Sport Cruiser with a 912ULS engine. I noticed the other day while doing an inspection that the throttle return springs seem to be weakening. When the throttle is pushed to the WOT position, there seems not to be enough pull to smartly engage the the throttle to the wide open stop. When the plane sits idle, the throttle is closed. In this position, the springs remain under maximum stretch tension. I am going to replace them, but was wondering if anyone else has encountered this situation or any complications from it.
Advance thanks for any replies.
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Thu Nov 18, 2010 5:04 am Post subject: Re: Rotax 912 throttle return springs |
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I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
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Thom Riddle
Buffalo, NY (9G0)
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dashwood
Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada
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| Posted: Thu Nov 18, 2010 5:34 am Post subject: Re: Rotax 912 throttle return springs |
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i had the same problem. make sure the cable and linkages are all free, and carbs are set right and all engine mounts are in good shape.. I had to change my springs once. no biggie and not expensive. mostly did it for piece of mind. if you think its a problem its not worth fussin about just change them.having someone else Tell you something is good and then still worrying about it isn't worth the stress
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Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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trigo(at)mail.telepac.pt
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| Posted: Thu Nov 18, 2010 6:40 am Post subject: Rotax 912 throttle return springs |
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That’s right Lucien, that’s the right way to do it!
After the last shutdown of the day, push that throttle all the way in.
But don’t forget to put a line on your check list, on the Start-up procedure, that goes something like “Throttle – pull back to idle”, obviously before the “Start the engine” line
Carlos
[quote] --
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flyadive(at)gmail.com
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| Posted: Thu Nov 18, 2010 10:44 am Post subject: Rotax 912 throttle return springs |
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Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
[quote] --> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
“Everyone is entitled to his own opinion, but not his own facts.”
Daniel Patrick Moynihan
Read this topic online here:
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dashwood
Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada
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| Posted: Thu Nov 18, 2010 12:27 pm Post subject: Re: Rotax 912 throttle return springs |
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just a question... does leavin the carbs wide open let air into the engine, good or bad,,, and let more air into the carb chambers to allow varnishing inside little passages.. and / or to engines exposed to the weather maybe water into the engine///. i understand the filters are in place but i have hear of engines being drowned in heavy rain. mostly from water saturation of the filters causing problems though.
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Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money |
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dashwood
Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada
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| Posted: Thu Nov 18, 2010 12:33 pm Post subject: Re: Rotax 912 throttle return springs |
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quote=== I know I'm late on entering this Throttle Return Spring discussion. �
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What�position�does it return the Throttle to?
Barry��
the spring is on each carb so if there is a throttle linkage problem( break or failure of a connection) the engine goes to full power. good on takoff and landings , not soo good at the fuel pump or near a hanger.. the throttle system in a ch701,601,750 has been criticized for being too complicated
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Ross Alexander: CH701 driver 912ul 788tt
It only takes two things to fly, airspeed and money |
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kevann(at)gotsky.com
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| Posted: Thu Nov 18, 2010 12:59 pm Post subject: Rotax 912 throttle return springs |
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The throttle return springs pull the throttles wide open. So if the throttle cable fails, you have lots of power instead of no power.
Kevin
[quote] ---
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Nov 18, 2010 2:34 pm Post subject: Rotax 912 throttle return springs |
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Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
| Quote: | Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
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--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
[quote][b]
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_________________
The smallest miracle right in front of you is enough to make you happy.... |
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flyadive(at)gmail.com
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| Posted: Thu Nov 18, 2010 3:10 pm Post subject: Rotax 912 throttle return springs |
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Rick:
That is the answer I was hopping to get. I do not see any reason to go the other way.
Thanks Rick,
Barry
On Thu, Nov 18, 2010 at 5:29 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
[quote]Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
| Quote: |
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
|
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
_blank">http://www.matronics.com/contribution
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
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[b]
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Thu Nov 18, 2010 5:51 pm Post subject: Rotax 912 throttle return springs |
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I always thought the springs on the 912 were set to open the throttles not
close them.
Am I wrong?
Noel
--
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Thu Nov 18, 2010 6:30 pm Post subject: Rotax 912 throttle return springs |
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Then the question should be why have a spring at all... From what I see all it does is put pressure on the throttle cables. Wouldn’t it be better not to have springs at all?
BTW the 582 with the Bing carbs will go to idle if the cable breaks
Noel
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Richard Girard
Sent: November 18, 2010 6:59 PM
To: rotaxengines-list(at)matronics.com
Subject: Re: Re: Rotax 912 throttle return springs
Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
--> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
“Everyone is entitled to his own opinion, but not his own facts.”
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319901#319901
===========
="_blank">www.aeroelectric.com
ooks.com" target="_blank">www.buildersbooks.com
et="_blank">www.homebuilthelp.com
="_blank">http://www.matronics.com/contribution
le, List Admin.
===========
-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
===========
http://forums.matronics.com
===========
| Quote: | | _blank">www.aeroelectric.com.com" target="_blank">www.buildersbooks.com="_blank">www.homebuilthelp.com_blank">http://www.matronics.com/contributionist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-Listtp://forums.matronics.com |
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
0123456789 | Quote: | | _blank">www.aeroelectric.com |
0 | Quote: | | _blank">www.aeroelectric.com |
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[quote][b]
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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thesupe(at)hotmail.com
Guest
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| Posted: Thu Nov 18, 2010 7:58 pm Post subject: Rotax 912 throttle return springs |
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These (912) carbs are constant velosity carbs and the slides are raised or lowered by more or less vacuum. When the engine is not running, the slides are at the bottom, no matter where the throttel is set. Take care, Jim Chuk
> Subject: Re: Rotax 912 throttle return springs
| Quote: | From: dashwoodlock(at)hotmail.com
Date: Thu, 18 Nov 2010 12:27:46 -0800
To: rotaxengines-list(at)matronics.com
--> RotaxEngines-List message posted by: "dashwood" <dashwoodlock(at)hotmail.com>
just a question... does leavin the carbs wide open let air into the engine, good or bad,,, and let more air into the carb chambers to allow varnishing inside little passages.. and / or to engines exposed to the weather maybe water into the engine///. i understand the filters are in place but i have hear of engines being drowned in heavy rain. mostly from water saturation of the filters causing problems though.
--------
Ross Aalexander: CH701 driver 912ul 450tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319955#319955
=====================
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dirtfly7(at)yahoo.com
Guest
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| Posted: Thu Nov 18, 2010 8:13 pm Post subject: Rotax 912 throttle return springs |
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--- On Thu, 11/18/10, FLYaDIVE <flyadive(at)gmail.com> wrote:
| Quote: |
From: FLYaDIVE <flyadive(at)gmail.com>
Subject: Re: RotaxEngines-List: Re: Rotax 912 throttle return springs
To: rotaxengines-list(at)matronics.com
Date: Thursday, November 18, 2010, 4:08 PM
Rick:
That is the answer I was hopping to get. I do not see any reason to go the other way.
Thanks Rick,
Barry
On Thu, Nov 18, 2010 at 5:29 PM, Richard Girard <[url=/mc/compose?to=aslsa.rng(at)gmail.com]aslsa.rng(at)gmail.com[/url]> wrote:
| Quote: | Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <[url=/mc/compose?to=flyadive(at)gmail.com]flyadive(at)gmail.com[/url]> wrote:
| Quote: |
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <[url=/mc/compose?to=riddletr(at)gmail.com]riddletr(at)gmail.com[/url]> wrote:
|
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
| Quote: | | _blank">www.aeroelectric.com.com" target="_blank">www.buildersbooks.com="_blank">www.homebuilthelp.com_blank">http://www.matronics.com/contributionist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-Listtp://forums.matronics.com |
-= * AeroElectric www.h href="http://www.matronics.com/contribution">http://www.matronics.com/corget="_blank" href="http://www.matronics.com/Navigator?RotaxEngines-Lis target="_blank" href="http://forums.matronics.com">http://forums.matro===================Rick, On some Aircraft like the Rans S-7S the springs are changed on the engine to where the spring will pull it to idle. This is a safety feature that will keep your aircraft from running away from you on the ground and causing major destruction. |
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[quote][b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Nov 18, 2010 8:36 pm Post subject: Rotax 912 throttle return springs |
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Noel, You're right about the Bing 54 on the 582, a fact that keeps my cables lubed and inspected to excess. Which would you rather have if a throttle cable breaks an engine at WOT or an engine at idle. Think miles of trees underneath you and no clearing in sight. Jim, The throttle cable on the Bing 64 is connected to the throttle butterfly, not the piston. The butterfly sets the throttle and the piston does fine adjustment of the mixture my raising and lowering the jet needle in response to atmospheric pressure.
Joel, if that was your comment in the tiny, tiny print about changing over the throttle springs to pull the butterfly to idle, wheel chocks and checking the throttle position before starting the engine can keep your plane from running away. IF you're at 2000' over a forest with your wife or child on board when a throttle cable breaks and the engine goes to idle, I truly doubt you'll be calling that a "Safety Feature" right about then.
Rick Girard
On Thu, Nov 18, 2010 at 8:24 PM, Noel Loveys <noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)> wrote:
| Quote: |
Then the question should be why have a spring at all... From what I see all it does is put pressure on the throttle cables. Wouldn’t it be better not to have springs at all?
BTW the 582 with the Bing carbs will go to idle if the cable breaks
Noel
From: owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com) [mailto:owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com)] On Behalf Of Richard Girard
Sent: November 18, 2010 6:59 PM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: Re: Re: Rotax 912 throttle return springs
Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
--> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
“Everyone is entitled to his own opinion, but not his own facts.”
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319901#319901
===========
="_blank">www.aeroelectric.com
ooks.com" target="_blank">www.buildersbooks.com
et="_blank">www.homebuilthelp.com
="_blank">http://www.matronics.com/contribution
le, List Admin.
===========
-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
===========
http://forums.matronics.com
===========
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
012345 6789 012 34567890 123 4
5
|
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
[quote][b]
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dan(at)azshowersolutions.
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| Posted: Fri Nov 19, 2010 1:09 am Post subject: Rotax 912 throttle return springs |
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Richard, Having the carbs go to wide open might be a good thing as long as you are flying over a place you would never want to put down, however, there are other places I can think of it would be a disaster...think of taxiing in a public airport and then your engine goes wide open. I'm sure running into that King Air would ruin your day. I know many folks who take the springs off and leave them off. The other thing to think about is we have two carbs. What are the odds both of the throttle cables will fail at the same time? More than likely one will go and then you will have a very rough running engine with the carbs out of balance.
Just my 2 cents
[quote]
From: Richard Girard <aslsa.rng(at)gmail.com>
To: rotaxengines-list(at)matronics.com
Sent: Thu, November 18, 2010 9:33:45 PM
Subject: Re: Re: Rotax 912 throttle return springs
Noel, You're right about the Bing 54 on the 582, a fact that keeps my cables lubed and inspected to excess. Which would you rather have if a throttle cable breaks an engine at WOT or an engine at idle. Think miles of trees underneath you and no clearing in sight. Jim, The throttle cable on the Bing 64 is connected to the throttle butterfly, not the piston. The butterfly sets the throttle and the piston does fine adjustment of the mixture my raising and lowering the jet needle in response to atmospheric pressure.
Joel, if that was your comment in the tiny, tiny print about changing over the throttle springs to pull the butterfly to idle, wheel chocks and checking the throttle position before starting the engine can keep your plane from running away. IF you're at 2000' over a forest with your wife or child on board when a throttle cable breaks and the engine goes to idle, I truly doubt you'll be calling that a "Safety Feature" right about then.
Rick Girard
On Thu, Nov 18, 2010 at 8:24 PM, Noel Loveys <noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)> wrote:
| Quote: |
Then the question should be why have a spring at all... From what I see all it does is put pressure on the throttle cables. Wouldn’t it be better not to have springs at all?
BTW the 582 with the Bing carbs will go to idle if the cable breaks
Noel
From: owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com) [mailto:owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com)] On Behalf Of Richard Girard
Sent: November 18, 2010 6:59 PM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: Re: Re: Rotax 912 throttle return springs
Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
--> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
“Everyone is entitled to his own opinion, but not his own facts.â€
Daniel Patrick Moynihan
Read this topic online here:
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Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
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Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
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trigo(at)mail.telepac.pt
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| Posted: Fri Nov 19, 2010 2:26 am Post subject: Rotax 912 throttle return springs |
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Dan
In the first case you mentioned, when taxiing in a public airport and your engine goes WOT, you just flip your ignition switches to OFF, to avoid running into that expensive King Air.
In the other case, when only one cable will brake, you will certainly prefer to have a very rough running engine, but still be able to reach a suitable landing spot, than to choose the best tree branch to hit…
Please believe that those Rotax engineers already thought on all the possibilities, before deciding to put those return springs…
Carlos
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Dan Billingsley
Sent: sexta-feira, 19 de Novembro de 2010 9:00
To: rotaxengines-list(at)matronics.com
Subject: Re: RotaxEngines-List: Re: Rotax 912 throttle return springs
Richard, Having the carbs go to wide open [b] might[/b] be a good thing as long as you are flying over a place you would never want to put down, however, there are other places I can think of it would be a disaster...think of taxiing in a public airport and then your engine goes wide open. I'm sure running into that King Air would ruin your day. I know many folks who take the springs off and leave them off. The other thing to think about is we have two carbs. What are the odds both of the throttle cables will fail at the same time? More than likely one will go and then you will have a very rough running engine with the carbs out of balance.
Just my 2 cents
| Quote: |
From: Richard Girard <aslsa.rng(at)gmail.com>
To: rotaxengines-list(at)matronics.com
Sent: Thu, November 18, 2010 9:33:45 PM
Subject: Re: RotaxEngines-List: Re: Rotax 912 throttle return springs
Noel, You're right about the Bing 54 on the 582, a fact that keeps my cables lubed and inspected to excess. Which would you rather have if a throttle cable breaks an engine at WOT or an engine at idle. Think miles of trees underneath you and no clearing in sight.
Jim, The throttle cable on the Bing 64 is connected to the throttle butterfly, not the piston. The butterfly sets the throttle and the piston does fine adjustment of the mixture my raising and lowering the jet needle in response to atmospheric pressure.
Joel, if that was your comment in the tiny, tiny print about changing over the throttle springs to pull the butterfly to idle, wheel chocks and checking the throttle position before starting the engine can keep your plane from running away. IF you're at 2000' over a forest with your wife or child on board when a throttle cable breaks and the engine goes to idle, I truly doubt you'll be calling that a "Safety Feature" right about then.
Rick Girard
On Thu, Nov 18, 2010 at 8:24 PM, Noel Loveys <noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)> wrote:
Then the question should be why have a spring at all... From what I see all it does is put pressure on the throttle cables. Wouldn’t it be better not to have springs at all?
BTW the 582 with the Bing carbs will go to idle if the cable breaks
Noel
From: owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com) [mailto:owner-rotaxengines-list-server(at)matronics.com (owner-rotaxengines-list-server(at)matronics.com)] On Behalf Of Richard Girard
Sent: November 18, 2010 6:59 PM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: Re: RotaxEngines-List: Re: Rotax 912 throttle return springs
Barry, Unlike those on an automobile or other conveyance, the throttle return spring on an aircraft is there to make sure that if the throttle cable breaks the carb goes to wide open throttle.
Rick Girard
On Thu, Nov 18, 2010 at 12:41 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
Hey Guys:
I know I'm late on entering this Throttle Return Spring discussion.
But the questions I have are:
1 - Why is there a throttle return spring?
2 - What position does it return the Throttle to?
Barry
On Thu, Nov 18, 2010 at 8:04 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
--> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
I've never seen these springs to get noticeably weaker over time. I'm not saying they can't but spring steel takes a VERY LONG time to loose its springiness in normal service.
I suspect your cables might need lubrication or they have a tighter radius than desirable
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
“Everyone is entitled to his own opinion, but not his own facts.”
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319901#319901
===========
="_blank">www.aeroelectric.com
ooks.com" target="_blank">www.buildersbooks.com
et="_blank">www.homebuilthelp.com
="_blank">http://www.matronics.com/contribution
le, List Admin.
===========
-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
===========
http://forums.matronics.com
===========
| Quote: | | _blank">www.aeroelectric.com.com" target="_blank">www.buildersbooks.com="_blank">www.homebuilthelp.com_blank">http://www.matronics.com/contributionist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-Listtp://forums.matronics.com |
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
012345
67890123
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
4
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri Nov 19, 2010 4:35 am Post subject: Re: Rotax 912 throttle return springs |
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It is standard aviation practice to spring load the throttle arm to wide open.
Several years ago, one my partners in a Cherokee 140 had the throttle cable break during flight and it went to full throttle which enabled him to get home and landed deadstick after turning off the fuel and then the mags. Cable replaced and we were back to flying.
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Don't worry about old age... it doesn't last very long.
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jlatimer1(at)cox.net
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| Posted: Fri Nov 19, 2010 7:13 am Post subject: Rotax 912 throttle return springs |
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Before messing with the springs on the 912, you need to read this builders account of his mishap with only a couple of hours on his plane. http://ch601.org/stories/croke_crash.htm Jerry 601HDS 912ULS N316JL
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