> > >> Let me know if you need more dimensions Jerry.
> > >> --
> > >> Paul Lamar ...No rotor no motor.
> > >
> > > Hi Paul,
> > > wasn't moving the prop out to 44 inches the way to go?
> > >
> > > Kind regards
> > > Thomas
> > >
> > > I am not sure. Depends on the weight and balance. Some guys are
> > > beefing
> > > up the tail so that adds weight back there. Beefing the tail on the
> > > rotary powered RV4 is unnecessary. Tracy has not had the tail skin
> > > cracking problems
> > > the Lycoming powered airplanes have experienced due to way less
> > > vibration.
> > >
> > > --
> > > Paul Lamar ...No rotor no motor.
> >
> > Thomas, most plans, using an 0-320, have the prop flange at around
> > 38 inches. I recommend standardizing the distance to 40 inches for
> > most rotary installations. Doing so provides some very useful
> > space between the engine and firewall. Note that a p ported engine
> > will probably weigh less than an 0320 FWF. The absolute minimum is
> > 36.75 inches if you want to be able to RR the water pump without
> > pulling the engine. If for c.g. reason the prop flange distance
> > needs to be some amount greater than 40 inches, we can do that. So
> > far only one engine installation has required more than 40 inches.
> > There are no serious c.g. issues swapping in the rotary but you will
> > probably have to fine tune with battery placement. Jerry
> >
>
> Basically I'm for moving the prop flange as far out as practicable,
> to gain more space under the cowling.
> But in the end the renesis FWF-kit should develop about the same
> amount of torsional moment relating to a plane of reference as a
> common O-320 FWF-kit would.
>
> That opens up two new problems to me. How much weighs a renesis
> [RX8 eng.] FWF-kit compared to a O-320 FWF kit and where is
> approximately the c.g. of a complete FWF-kit?
>
> best regards
> Thomas
>
> The RX8 engine weighs about the same as a 13B. If the flange
> on the 13B is set at 39 inches the weight and balance comes
> out about the same as Lycoming O-320. The CG of the engine/PSRU/prop
> combination is about near the flywheel end housing or perhaps
> one or two inches aft of that. The firewall forward weight
> is about 320 pounds. Obviously that is about the same for
> the Lyc O-320.
>
> http://www.rotaryeng.net/all-aircraft-engine-weights.txt
>
>
> Paul Lamar ...No rotor no motor.
>
Hi Paul an Jerry,
thanks for your efforts. Lets go with 40 inches.
best regards
Thomas
Thomas if you don't mind my asking what part of Germany
are you in?
--
Paul Lamar ...No rotor no motor.
Hi Paul,
Franconia. A little vileage near nuremberg.
kind regards
Thomas
I have some friends in Frankfurt. Been to Germany many times.
Nice country. Have you been to the Wankel Museum in
Altlrussheim?
Paul Lamar ...No rotor no motor.
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