You are trying to do this with a very small displacement

engine(almost half

the size of the 3.2L), which means you will really have to wind

it

<<<snip>>>

rotor head, but I assure you our criticism is
only intended

to be constructive. I hope you make us all look like fools,

because I hate

to be the bad guy, but I also worry about the safety of your

engine choice.

Monty

Paul, The best piston sound I ever heard was a P-38
turning onto the runway and pouring the coal to it
for take off. Virg

Well, again, I'm in a huge crowd of one.  I'd like the engine and prop
both to be whisper quiet.  Yes, I know that is impossible with current
technology with the prop, but the engine can be mostly silenced --
tradeoff between power/weight and noise.

AI Nut

Actually Al,

You are not alone in that regard. I too would like a whisper quiet aircraft
engine and prop. I got started flying in sailplanes and I have never gotten
over the relaxing effect of soaring with bald eagles in silence. One of the
reasons that I looked at using a piston engine was being better able to
silence the exhaust. I am not convinced that this is not possible with
rotary, merely more of a challenge. The new side exhaust engines will help
this, and a turbo will help out as well.  The only way to make a prop quiet
is to turn it slowly, which means it has to be big, which creates problems
in a high speed Xcountry design. So I guess I'll go for reasonably quiet in
my Xcountry plane, and go soaring when I really want tranquility.

Monty

One of my reasons for choosing a turbo.

Paul Lamar
 
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