REFLECTOR: Ivo and Vesta

nmflyer1 at aol.com nmflyer1 at aol.com
Thu Apr 23 22:27:48 CDT 2009


Scott. 

By no means am I a vibration specialist!? What I DO know is that the 90-degree V-6, Counterbalanced, and dynamically balanced to within a half a gram is a pretty smooth engine compared to antique style aircraft engines. I was asked about my setup in depth from Ivo himself. He also asked what my redrive ratio was, what kind it was (belt, and that helped dampen pulses a lot), what RPM I planned on cruising at, torque, HP, cruise speed, and a host of other things. Once he was comfortable that there was not a wicked harmonic/vibration problem, then he agreed to make me a prop. 

I do know that the flat style engines (specially the 4 cylinders) are, what I term, "thumpers". It is difficult with the room and weight/space requirements to get enough counterbalance to make the thing run smooth. I had a Porsche 944 for a while. It was a pretty simple inline 4-cylinder. They had to add 2 counter-balance shafts to make the thing run smooth. and boy did that work!, but it took room, complexity and weight. 

By the way, I asked M&J aircraft if they had a prop box for you. Manny said sure... but you'd have to cut off one of the blades so that you could use his 2-blade boxes. I will keep looking. 

Kurt 



-----Original Message-----
From: Scott Derrick <scott at tnstaafl.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Thu, 23 Apr 2009 5:14 pm
Subject: Re: REFLECTOR: Ivo and Vesta



Kurt,

    I wonder whats the difference in power pulses between a Chevy  V6
and a Continental flat 6?  Why does one hammer a prop and the other not? 

Scott


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