REFLECTOR: Ivo and Vesta

[Scott Derrick]

Kurt,

Yeah I figured the V configuration, balancing, dampers all help.  My
Continental has 4 harmonic balancers  but  I think they are  to reduce 
stress on the crank shaft, not dampen pulses out to the prop, but maybe
thats all the same thing.  

I do agree there are antiquated aspects about the Lycosaurs, but they do
put out 75% power all day long at an amazingly low weight to power
ratio..  

I bought 3 of those cardboard tubes they sell at HD, to make cement 
piers.  They are  very tough and light.  I'm going to fabricate a box
today.. thanks for looking,

Scott

nmflyer1 at aol.com wrote:
> 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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