Bob,

They claim that the prop loses 4” of pitch at take off.  That would give you a 68 X 80 during static runup.  What static rpm do you get when you do the runup?  Do you have the 2.17 or the 2.85 ratio drive?

 

Bill B

 

 

The prop is a Prince P-tip composite propeller. 68” diameter x 84” pitch.  See http://princeaircraft.com/

 

Bob R

 

 

That really makes an aerodynamic installation!  Needlenose!  By the way, what kind of prop is that?

 

Bill B

 

 

Bill,

 

There is baffling along the sides of the radiator and oil cooler that cause all air entering the nose bowl openings to pass through the radiator and oil cooler (instead of around them) before it exits the bottom, where a large cowl flap regulates the amount of air flowing through the engine compartment.  See the attached pictures.  The oil cooler is at the top of the radiator.  Initially, my oil got too hot at high power settings, so I added a second Mazda 13B oil cooler (in series) and placed it right in front of the radiator.  It worked, and the oil temps are now about 10 degrees cooler than the water.  I keep the water temp at about 180 degrees F most of the time and never more than 200 degrees F.

 

The plane flies beautifully and is currently being painted.  Stay tuned for pictures of the finished project.

 

 

Bob J. Rogers

Mustang II

N62BT

 

Bob,

I noticed that you have the radiator mounted at an angle behind the engine.  Tell me again how you are ducted to and from the rad?  What about the oil cooler?  Where is it and how is it ducted.  What about any cooling issues?  How is your plane flying now that it has been a year?

 

Bill B

 

 

I am the guy in McKinney.  See http://www.eaa1246.org/projectsnplanesdisplay.asp?id=10 and http://www.eaa1246.org/videodisplay.asp?id=36

I am not an A&P.

 

Bob Rogers

Mustang II

N62BT

 

 

There’s also a guy in McKinney.  I can’t remember his name, but you could find it on the EAA website.

Bryan

 

 

Al,

I am about 70 miles SW of DFW at Pecan Plantation (0TX1), and Jason Hutchison also has a rotary-powered RV-6A here.  Feel free to visit anytime.  Neither of us is an A&P.

Bill Eslick