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Graeme Toft
Joined: 09 Jan 2006 Posts: 123
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Posted: Sun Jul 23, 2006 7:02 pm Post subject: Setting prop to revs |
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Hi guys, I have my prop bolted on and will be experimenting with pitch soon but as I am unsure what my max static revs should be I am a bit concerned. Can some body with an NSI non turbo and ground adjustable prop tell me what revs I should expect to see for best results. I was getting 4700 rpm flat out but feel I should be seeing over 5500 rpm. The prop I have put on is a 72 inch 3 blade composite which when installed into the hub comes down to 70inch.
Regards
Graeme Toft
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janderson412(at)hotmail.c Guest
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Posted: Sun Jul 23, 2006 8:13 pm Post subject: Setting prop to revs |
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Fo a start Graeme, if you get 5000 static, that will certinly get you flying safely. At 4700 your'e very near top of the tq curve. John A.
Quote: | Hi guys, I have my prop bolted on and will be experimenting with pitch soon but as I am unsure what my max static revs should be I am a bit concerned. Can some body with an NSI non turbo and ground adjustable prop tell me what revs I should expect to see for best results. I was getting 4700 rpm flat out but feel I should be seeing over 5500 rpm. The prop I have put on is a 72 inch 3 blade composite which when installed into the hub comes down to 70inch.
Regards
Graeme Toft
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Graeme Toft
Joined: 09 Jan 2006 Posts: 123
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Posted: Sun Jul 23, 2006 10:09 pm Post subject: Setting prop to revs |
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Hi John, thanks for the advice. I've been following the threads going back and forth between yourself and others with your own plane and being at the same point myself with engine info requirements Im really close to flying. The problem I have is that I was sent an NSI data sheet on engine performance and in it the advice was that take off engine revs should be around 6200. I shook my head in disbelieve at these figures and asked a mate who overhauled my engine what he thought and he agreed that the figures were high. I was wondering if the figures quoted are for the NSI engine with the CAP system. I dont know if that would make any difference or not but 6200 seem very high and more a kin to the 2 stroke rev range than a four stroke. Figures quoted in the NSI EA 81 OPERATING LIMITS are as follows.
Idle RPM 1350-1400
Cruise RPM 3200-4500
Take off RPM 6200
Max Continuous RPM 5800
Never exceed RPM 6500
Regards
Graeme
[quote] ---
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janderson412(at)hotmail.c Guest
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Posted: Mon Jul 24, 2006 1:19 am Post subject: Setting prop to revs |
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Yes, they certainly seem high to me me Graeme....I have a friend with a normally asperated EA81 and limits 5500 max for t/o. Goes very well, he has upped the comp ratio a little and bigger carb. You can always set the prop to give you more RPM for that one-of if your underpowered a bit but will cost on cruise. But that little engine sure is going to last longer at lower RPM. Is it a std EA81 or have you tweeked it a little? I limit to 5000 for t/o but rearly need it and 4000 for cruise but then I'm turbo'd. John
[quote] Hi John, thanks for the advice. I've been following the threads going back and forth between yourself and others with your own plane and being at the same point myself with engine info requirements Im really close to flying. The problem I have is that I was sent an NSI data sheet on engine performance and in it the advice was that take off engine revs should be around 6200. I shook my head in disbelieve at these figures and asked a mate who overhauled my engine what he thought and he agreed that the figures were high. I was wondering if the figures quoted are for the NSI engine with the CAP system. I dont know if that would make any difference or not but 6200 seem very high and more a kin to the 2 stroke rev range than a four stroke. Figures quoted in the NSI EA 81 OPERATING LIMITS are as follows.
Idle RPM 1350-1400
Cruise RPM 3200-4500
Take off RPM 6200
Max Continuous RPM 5800
Never exceed RPM 6500
Regards
Graeme
[quote] ---
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Graeme Toft
Joined: 09 Jan 2006 Posts: 123
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Posted: Mon Jul 24, 2006 2:02 am Post subject: Setting prop to revs |
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John, its the NSI 108 HP model. I think they are tweeked up a bit because the standard EA 81 is much lower in HP than that. Im going to go with your figures when Im back in Yeppoon and see how it goes. I'll let you know the results.
Cheers
Graeme ----- Original Message -----
[quote] From: John Anderson (janderson412(at)hotmail.com)
To: kitfox-list(at)matronics.com (kitfox-list(at)matronics.com)
Sent: Monday, July 24, 2006 7:15 PM
Subject: Re: Setting prop to revs
--> Kitfox-List message posted by: "John Anderson"
Yes, they certainly seem high to me me Graeme....I have a friend with a normally asperated EA81 and limits 5500 max for t/o. Goes very well, he has upped the comp ratio a little and bigger carb. You can always set the prop to give you more RPM for that one-of if your underpowered a bit but will cost on cruise. But that little engine sure is going to last longer at lower RPM. Is it a std EA81 or have you tweeked it a little? I limit to 5000 for t/o but rearly need it and 4000 for cruise but then I'm turbo'd. John
[quote] Hi John, thanks for the advice. I've been following the threads going back and forth between yourself and others with your own plane and being at the same point myself with engine info requirements Im really close to flying. The problem I have is that I was sent an NSI data sheet on engine performance and in it the advice was that take off engine revs should be around 6200. I shook my head in disbelieve at these figures and asked a mate who overhauled my engine what he thought and he agreed that the figures were high. I was wondering if the figures quoted are for the NSI engine with the CAP system. I dont know if that would make any difference or not but 6200 seem very high and more a kin to the 2 stroke rev range than a four stroke. Figures quoted in the NSI EA 81 OPERATING LIMITS are as follows.
Idle RPM 1350-1400
Cruise RPM 3200-4500
Take off RPM 6200
Max Continuous RPM 5800
Never exceed RPM 6500
Regards
Graeme
[quote] ---
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Float Flyr

Joined: 19 Jul 2006 Posts: 2704 Location: Campbellton, Newfoundland
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Posted: Mon Jul 24, 2006 4:37 am Post subject: Setting prop to revs |
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they are high.... for a car. My subie red lines around 6200. I haven't had it much over 5000. I guess that's why airplane engines age in hours instead of hundreds of thousands of miles.
It sounds like they are saying up to 6200 maximum for lift off, 5800 max for climb out and cruise around 4000.
I would probably use 6000, 5500 and 4200 respectively.
Just a guess.
Noel [quote]
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_________________ Noel Loveys
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AMuller589(at)aol.com Guest
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Posted: Mon Jul 24, 2006 9:49 am Post subject: Setting prop to revs |
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These are the 2.2 liter 1999 engine limits recommended by EGGENFELLNER AIRCRAFT. As I recall the engine controller limits it to 6200 rpm
Engine speed (EIS)
Maximum 5600 rpm
Climb 5200 rpm
Cruise 4500 – 4800 rpm
Descent (sufficient to avoid gearbox rattle)
We were unable to get a good climb/cruise with the ground adjustable pitch set for 5200 rpm at takeoff and settled on 4700rpm. That gives about 145mph IAS but only 400 fpm rate of climb. Takeoff is about 380 ft however so it a;pears we are getting good enough takeoff horsepower. Eggenfellner said for the type prop we used 4700 was good for the takeoff rpm. He only recommends inflight adjustable props and his turbocharged engines are run at full throttle 4700rpm in the Rans aircraft.
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Graeme Toft
Joined: 09 Jan 2006 Posts: 123
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Posted: Mon Jul 24, 2006 1:22 pm Post subject: Setting prop to revs |
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Thanks Noel and AMuller.
Regards
Graeme
Do not archive
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wingsdown(at)comcast.net Guest
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Posted: Mon Jul 24, 2006 2:19 pm Post subject: Setting prop to revs |
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I would like to mention just incase you will be doing the initial test flights, some do, that as you lift off and the airspeed picks up the prop will unload and will RPMS increase. Not a big deal but should you go pass the 6200 rev limiter, if that is where you have it set, the engine will begin to cut out. Just pull back a bit on the go stick, but if you are not ready one might get spooked. Just thought I would mention it.
Rick
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Graeme Toft
Joined: 09 Jan 2006 Posts: 123
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Posted: Mon Jul 24, 2006 2:52 pm Post subject: Setting prop to revs |
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Thanks Rick, do you feel that if I set the static revs at 5500 it would avoid passing the 6200 limit when the engine unloads.
Regards
Graeme
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wingsdown(at)comcast.net Guest
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Posted: Mon Jul 24, 2006 3:09 pm Post subject: Setting prop to revs |
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Think I would try 5200 first. Allot will depend on how you prefer to climb, steep or shallow.
Rick
[quote]
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janderson412(at)hotmail.c Guest
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Posted: Mon Jul 24, 2006 3:29 pm Post subject: Setting prop to revs |
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The 2.2 is designed to handle the higher RPM due to o/h cam. EA81 at high rpm those push rods are getting a real hammering. ~j~
Quote: | These are the 2.2 liter 1999 engine limits recommended by EGGENFELLNER AIRCRAFT. As I recall the engine controller limits it to 6200 rpm
Engine speed (EIS)
Maximum 5600 rpm
Climb 5200 rpm
Cruise 4500 – 4800 rpm
Descent (sufficient to avoid gearbox rattle)
We were unable to get a good climb/cruise with the ground adjustable pitch set for 5200 rpm at takeoff and settled on 4700rpm. That gives about 145mph IAS but only 400 fpm rate of climb. Takeoff is about 380 ft however so it a;pears we are getting good enough takeoff horsepower. Eggenfellner said for the type prop we used 4700 was good for the takeoff rpm. He only recommends inflight adjustable props and his turbocharged engines are run at full throttle 4700rpm in the Rans aircraft.
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janderson412(at)hotmail.c Guest
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Posted: Mon Jul 24, 2006 3:32 pm Post subject: Setting prop to revs |
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Any advice like this is really good as on the first flight the heart is really pounding for the first few minutes and the brain can have trouble keeping up...if it's like mine...~j~
[quote] I would like to mention just incase you will be doing the initial test flights, some do, that as you lift off and the airspeed picks up the prop will unload and will RPMS increase. Not a big deal but should you go pass the 6200 rev limiter, if that is where you have it set, the engine will begin to cut out. Just pull back a bit on the go stick, but if you are not ready one might get spooked. Just thought I would mention it.
Rick
[quote]
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janderson412(at)hotmail.c Guest
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Posted: Mon Jul 24, 2006 3:45 pm Post subject: Setting prop to revs |
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What do you think Rick, it is better to have the prop set slightly on the fine side, don't need to use full throttle for the first t/o if it gets off ok, but there if you need it. I was truely amazed on first flight how quickly it flew. ~j~
[quote] Think I would try 5200 first. Allot will depend on how you prefer to climb, steep or shallow.
Rick
[quote]
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wingsdown(at)comcast.net Guest
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Posted: Mon Jul 24, 2006 4:00 pm Post subject: Setting prop to revs |
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I think that is a personal decision based on ones own experience and experience level. OK I will throw this out there. I would set it so you can reach pattern altitude before the prop unloads enough to hit the rev limiter. However with the fixed prop you also have to consider what the max cruise speed is you want to be able to attain. That seems to be the eternal compromise with a fixed prop. Your setting will fall in there some where. But for now altitude is definitely your friend.
Rick
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