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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Mon Jul 27, 2009 1:53 pm Post subject: turbo control motor switch |
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Is it me?
In aligning the switches and allowing for spares etc., I came across
an admonition to interrupt the wires #14 & #2 'twixt turbo motor and control
box with an ON/OFF switch. It is not provided but allows for a shut-off of
the automatic adjustment of the gate in case it goes wild....
I went through the Europa installation book of words and found no
mention of same, but the Rotax install manual brings it up in one small
sentence.
I missed that.
Then I began to read back, and found the MAIN 914F manual page 213/
1997/02/01- the harness chart - and no interruptor switch there either, but
it's on the electrical circuit diagram on Installation page 74(? - I'm away
from paper).
Obviously I used the wrong source from time to time and neglected the
pursuant pages when setting up. The 'structions say a guarded or protected
switch is needed.
Just a precaution..........
Cheers, Ferg
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rparigor(at)suffolk.lib.n
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| Posted: Mon Jul 27, 2009 2:45 pm Post subject: turbo control motor switch |
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Hi Ferg
Figured would mention that for those operating a 914, you should be familiar with a RTCA DO 178 B take off as depicted in the 914 operators manual.
To make things simple, the complex sensor riddled 914 has those sensors connected to the TCU (Turbo Control Unit). The TCUs only decision making it is capiable of is to leave the wastegate opened, or close it.
If you are counting on war emergency power (115%) to clear that 150 foot tree at the end of your 800 foot runway in the middle of the summer that is situated on the peak of a mountain, it would be a real drag if your TCU for one of many reasons descided to turn your Belsh fire 914 into a 912. If you turn off TCU with wastgate closed and use your throttle to limit boost to maximum, you can be assured wastegate will at least remain closed. This would not be a good idea for long periods of time, but to clear hazard, a good thing to know about.
Another attribute to knowing your power plant, is you can cycle things and shut off servo with wastegate full opened. This way if you have some sort of malfunction, just turn it into a 912.
Just a side note, if you overboost a 914 because for whatever reason the wastegate is remaining closed, the fuel pressure regulator can not keep up with demands of motor and you will run out of gas in carb float bowls, when enough gas fills bowls engine will come back to life, and run out again, etc. etc. anyway if you were able to turn off turbo by opening wastegate, motor is just a 912 and chances are things will be fine till you get on ground. If you had a differential fuel pressure gauge you could see the tail wagging the dog. If you use throttle to limit MP, for a short time not too bad a thing, but you can overspeed turbo and make it work plenty hard with the restricted outpu, not too good for long life of turbo.
Anyway if you fly a 914, be very familiar how to reboot or cycle TCU and practice to learn what is normal, and if all else fails practice how to just plain turn it off. Also if you are depending on more than what your motor can put out as a 912 to clear an obstruction, practice DO 178 b take offs.
Ron Parigoris
Visit - www.EuropaOwners.org
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Ivor Phillips
Joined: 16 Jan 2006
Posts: 253
Location: London UK
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| Posted: Mon Jul 27, 2009 11:56 pm Post subject: turbo control motor switch |
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All I did Ferg was put a small push button switch (to open) in the feed to the servo, apparently this is in case the servo starts to hunt! Just press the button and the servo will reset it self, Never needed to use it so far 
regards
Ivor
| Quote: | Is it me?
In aligning the switches and allowing for spares etc., I came across
an admonition to interrupt the wires #14 & #2 'twixt turbo motor and control
box with an ON/OFF switch.
|
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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budyerly(at)msn.com
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| Posted: Tue Jul 28, 2009 11:43 am Post subject: turbo control motor switch |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Ferg,
No it just takes keeping up with the manuals. Not that you have a life beyond building the Europa. Check the new on line rotax site and get the latest manual.
I prefer a momentary mini toggle switch without guard. Don't use a clunk on and off one as a momentary push stops the cycling of the servo motor. I use an led yellow and red with the switch next to it as my standard.
Other changes are the fuel pump notes and very often missed is having a secondary power source for the aux boost pump. I have used a second battery, off the alternator feed as recommended by rotax and off a battery emergency bus. Of course you can be the office of redundant redundancy and what if what you want.
Keep your fuel filters clean and keep building. Flying is more fun when you know the plane is done right....
Bud
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