> > > >> hi, group does anyone know of anyone documenting an RX8

conversion on

     > the
     > > > >> web. : cliff
     > > > >
     > > > > Sure Don Dunbar is installing an RX8 engine in his Mustang

II. There

     > may be
     > > > > others.
     > > > >
     > > > > Paul Lamar

     > > > Tracy Crook is already flying one.
     > > > Bulent
     > >
     > > What else do you know about this Bulent?
     > > I am surprised I havent heard anything from Tracy on this.
     > > I guess he is pretty busy. Probably trying to fly off the 40

hours before

     > > Sun & Fun. My guess is he is also using the 2.85 six pinion

gear box.

     > >
     > > I better bring the Everett Hatch Memorial Fund check book in

case he

     > > decides to enter the Sun 100 race and average more than 220

MPH.

     > >
     > > Paul Lamar

     Richard wrote:
     >
     > As far as I know, Tracy is flying the 2.85 gear on his 13B with a

new prop.

     > He is checking out this combination before putting it on the

Renisis.

     > Sorry Tracy, I should have left it to you, just couldn't.
     >
     > Richard Sohn

     No sweat Richard, glad to have help getting out the details.
    Very busy getting plane ready for Sn'F.  Up to my ears in fiberglass

doing plastic

     surgery on cooling inlets.  Airflow changes with right hand prop

made this necessary.

     Tracy

Wow Tracy if the 2.85:1 alone is making that much more HP on takeoff what
is going to happen when you get the RX8 engine in there? :)

BTW what prop pitch and diameter are you using?

Paul Lamar

There you go Paul - confusing torque with horsepower - P factor
is not all torque but swing a "big" prop they are closely related
Vance

No I am not :) He is running more RPM with the 2.85:1 hence in a free breathing
rotary HP is directly proportional to RPM. 2.85/2.17 X 180 HP = 236 HP!!!!
Tracy has a street ported engine so peak HP is probably up around 8500 RPM.

BTW I don't expect the RX8 engine to generate much more HP than a current
street ported 13B.

So you think it is prop gyro torque? When Tracy says "big prop" he is probably
means 74 inches instead of 69 inches. Hardly a huge change in rotational inertia.
The usual problem with too much power is the airplane flies before the control surfaces 
become effective. What killed most Gee Bee pilots was the airplane would leave the 
ground before the ailerons became effective and rolled over. Either that or 
the helical slip stream is impinging on the vertical stabilizer turning the 
airplane.

Tracy, what is your new prop diameter and pitch?

Paul Lamar
 
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