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A lot of stiffness is added to the fuselage by the
two wing struts (when installed). Without the wing struts the fuselage
could start to twist and untwist with the Lycoming power strokes and should the
fuselages natural resonance frequency be near the rpm you are running it can
start to amplify and can cause the tail to twist sufficiently to cause
damage.
Since you are not faced with the heavy Lycoming
power strokes and the rpm of the rotary is likely to considerably higher than
the Lycoming (hopefully {:>)) I don't think you will have that problem.
However, you will still have the prop turning in one direction and fuselage
trying to turn in the opposite direction. I would bolt a wooden "fake"
spar in main spar slot with at least a couple of bolts each side and I would
anchor the left side (sitting in pilot's seat) to a ground tie down with a
rope. That would ensure that the CW turning prop (sitting in pilot's seat)
would not be able to turn the aircraft CCW.
Good Luck! Is this with turbo on or
not?
----- Original Message -----
Sent: Thursday, July 03, 2003 4:51
PM
Subject: [FlyRotary] First run
approaches
Greetings,
I’m hoping for a first engine run
this weekend, and had a question for all of you that ran before assembling
your planes. Van does not recommend running Lycoming engines with the
wings of the plane removed, because the power pulses will damage the
tail. That shouldn’t be a problem for me, but how about
torque? Do I need to be worried at all about the plane torquing to
one side? It doesn’t seem likely, but I thought I’d ask if anyone saw
much of a torque effect. This is with the prop, btw.
Thanks,
Rusty
Turbo 13B powered RV-3
(experimental aircraft)...Be Afraid :-)
1993 RX-7 R1... Not stock, carry
bail money :-)
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