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Why exactly shouldn't you run a 914 without a prop?

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Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Apr 19, 2010 8:08 am Post subject: Why exactly shouldn't you run a 914 without a prop?

Hi Ron,

 	  Quote: 	
		   I will use on my 914 series with bypass fuel systems, with added 

 Europa twist of adding a second Andair 375 Gasculator to allow second 

 pump to have ability to draw from another source. I willl only use 

 Wacker spark plug thermal conductive compound.

Add to that  adequate cooling of the engine, with a correctly designed 
	


cooling duct and cowl flap.



 	  Quote: 	
		   I will check Carbon Monoxide levels above 100% power. I will if my 

 life were threatened by the  wastegate opening, would follow DO 

 procedure in operators manual to leave it closed until obsticle is 

 cleared.

Concerning the wastegate ensure good lubrication, and monitor the MP 
	


during the takeoff run and initial climbout. In our project, when 

operating from a low level aerodrome, takeoff  takes place about  10 

seconds after releasing the brakes and power reduction to 100% about 5 

seconds later.



 	  Quote: 	
		   I can go on and on, but if anyone is not following the above procedure 

 does it make them unsafe or putting life and engine at risk? If you 

 don't follow Mfgs. procedure perhaps the answer perhaps is yes, 

 perhaps no, need to take on a case by case basis. Rotax is not an 

 absolute advocate of only flying a 914 with a differential pressure 

 gauge IMHO they should be.

The initial subject was avoiding mishandling of the engine.
	


Yes monitoring the fuel pressure could add to the pilot's peace of mind, 

but it has no influence on the running of the engine. We monitor FF 

during takeoff.



 	  Quote: 	
		   BTW, did you ever verify with Carbon Monoxide test as suggested or 

 required by Rotax (older serial number engines and if you have a 

 Intercooler it is a requirement) that you are running rich enough on 

 all 4 cylinders above 100% power? If you didn't use Carbon Monoxide 

 detector, how did you verify?

Will verify if it applies to our engine. For the time being, plugs seem 
	


to be OK.



Best regards,

-- 

Gilles

http://contrails.free.fr

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rparigoris

Joined: 24 Nov 2009
Posts: 804

Posted: Mon Apr 19, 2010 10:33 am Post subject: Re: Why exactly shouldn't you run a 914 without a prop?

Hi Gilles

"Yes monitoring the fuel pressure could add to the pilot's peace of mind, 

but it has no influence on the running of the engine. We monitor FF 

during takeoff."

Lack of differential fuel pressure on take off leads to "running" of the pilot when engine plays mellow song of "silent night". You need between ~ 2 and 5 PSI differential. If low you could get proper fuel flow but on verge of not being able to meet crack pressure of fuel pressure regulator. Problem is if you have full float bowls and begin take off run, you will be in air with perhaps not enough runway to land on when they run out. Also when cruising it gives you a heads up to close at hand failure. Most culprits of low differential pressure is clogged fuel filter or gasculator/s. If you reduce power and can attain 2 PSI then you could probably gain yourself a little more time. At altitude where the pumps have to work hardest are where you will first see lower readings, a lower altitude may allow you to reach airport. Running lean at altitude is a very bad thing to do, fuel flow may be fine at less than 2 PSI, but go too much lower and fuel flow will suffer. Differential can give you a heads up to problem before it happens.

Ron Parigoris

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rparigoris

Joined: 24 Nov 2009
Posts: 804

Posted: Mon Apr 19, 2010 12:28 pm Post subject: Re: Why exactly shouldn't you run a 914 without a prop?

Heres someone else running without a prop. No question it revs quickly, but not unlike many motorcycles:

http://www.youtube.com/watch?v=tUrFJi93MIo

Jason, is this you?

Ron Parigoris

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