Hi Paul,

I started to fly my RV-7A, even with the help you provided, It took 9
years and 4 months and I still have finish work to do, Probably a
year worth of work.

I have one major issue with the propeller: Wood prop D = 76 in, Pitch
= 88 in, Static RPM = 5700

No increase in RPM with speed increase, Take off takes over 1500
feet Top speed 105 mph

I tried a Wood prop D = 69, P = 56, Static RPM over 7300 Could not
fly it because of vibration.

What would you suggest?

Thanks,

JP


Assuming you have a 2.85:1 gear box cut 4 inches off the first wood
prop diameter and rebalanced it.

Balance the second wood prop and try it again.

Pass a round bar through the hub and use horizontal and parallel
steel bars to static balance it.

Take some pictures of the intake manifold and email them to me.

Put the word "PRIVATE" in the email subject box if you don't want me
to publish them.

Paul Lamar


paul, curious: what's the interest in the intake? novice here, excuse me if is stupid question........
jess


The key to tuning a rotary engine is the design and construction of the intake manifold.

18 inch 2" OD  runners and a p-port is optimum.
Anything less that this is less power.

Paul Lamar


The Rotary Engine News Letter. Powered by Linux. ACRE NL web site.
http://www.rotaryeng.net. You Tube http://tinyurl.com/beqqxas.
Copyright 1998-2013 All world wide rights reserved.