Paul,
Is there a link somewhere detailing the work on the 20B HR 2 ? I
have considered building a plane like this (not for time-to-climb)
and wondered what kind of modifications the builder has made to
handle the power. Also, what kind of top / cruise speeds he's
expecting.
Also thinking about 13B Mustang 2, but like the higher speeds of the
HR better.
Dennis Lithgow, PE
By "HR" I think you mean the Harmon Rocket. The 20B 3 rotor is more
or less just the same as a 2 rotor installation only longer MM
tubes. The Harmon Rocket would accommodate the extra weight of a
stock 3 rotor no problem.
The motor mount tubes would be longer and the latest Ford six pinion
based PSRU would be strong enough for a non turbo 3 rotor. We will be
using the silicon rubber coupling on the TTC engine with the Bell 47
gear box..
In P-port form you would have 375 HP to work with at 7500 RPM.
We are working on the all aluminium time to climb 2 rotor engine
with turbo and it weighs less than 200 pounds. Far less weight than
the 6 cyl the HR normally uses and with the pilot is in the back seat
we have an aft CG problem.
Modifications were made to accommodate the necessary tanks for oil,
water and alcohol fuel. Nothing was done to the air frame as the
anticipated climb speed is about 100 MPH at a 45 degree angle of
attack. Considerable modifications where made to our normal cooling
system to accommodate the 45 degree angle of attack and vastly
increased HP. I have no idea how fast it would go as we have not
thought about a cowling yet.
You would not have those problems with a stock 3 rotor converted to
p-ports.
Dan Gray is a good man at SZP that could help you finish the air
plane. He has now and will have lots more experience. I won't be
around for ever :-)
Paul Lamar
When I didn't hear from you, I thought you had been raptured.
Peter Duffecy
You are living in a dream world Peter :-)
Paul Lamar
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