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

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Sun Apr 18, 2010 7:13 am Post subject: Why exactly shouldn't you run a 914 without a prop?

Very interesting stuff, perhaps a bit weight in the case of EPI who are 

selling a product and obviously would be making a case for the need. 

However in the case where they show the extreme torque spikes they have 

a prop on which increases the spike and the charts all are full throttle 

applications which do the same. These large torsion loads and vibrations 

may very well not present themselves in the case of a smooth idle at 

virtually closed throttle, in fact it seems likely to me that they would 

not.



Just to be clear, (and again I will never demand proof or challenge your 

opinion) is it your feeling that running in the state people are 

discussing here WILL cause harm, or merely a caution that harm MAY result.



A note of caution is always a good thing but my feeling is that 

exercising caution does not always mean that we must not do something at 

all. In the simplest case crossing the street requires caution, but the 

solution would not be to stay home.



On 18/04/2010 11:16 AM, Gilles Thesee wrote:

 	  Quote: 	
		   -The problem is, one cannot judge torsional vibrations just by eye or 

 ear, otherwise aero engineers would not resort to sophisticated 

 sensors and analysers, and their life would be easier.

 Here are a few links which could be of interest to people with a 

 mechanical mind (no maths) :

 http://www.enginehistory.org/NoShortDays/TV.pdf

 http://www.epi-eng.com/propeller_reduction_technology/torsional_vibration_issues.htm 



 http://www.epi-eng.com/piston_engine_technology/torsional_excitation_from_piston_engines.htm 

 Best regards,

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