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-   -   Question about propeller position (http://forum.canardaviation.com/showthread.php?t=6934)

xpmt 11-18-2016 02:55 PM

Question about propeller position
 
This is a question for anyone on the site who can answer it. A number of builders elected to install Mazda rotary engines, These required PSRU,s, Until recently, they could use Real World Solutions units which are coaxial with the engine output shaft. These are no longer available. A good substitution is the Ballistic unit. It raises the drive line about 4 1/2" Does this adversely affect flight behavior or is it not relevant?

TMann 11-18-2016 03:56 PM

Re: Question about propeller position
 
Actually, I believe the RWS PSRU is being pursued by some members of the Fly Rotary group.
I would start there.
www.flyrotary.com

xpmt 11-18-2016 05:30 PM

Re: Question about propeller position
 
T-Mann;
Thanks for reply

Andrew Anunson 11-19-2016 02:05 PM

Re: Question about propeller position
 
Quote:

Originally Posted by xpmt (Post 78256)
A good substitution is the Ballistic unit. It raises the drive line about 4 1/2" Does this adversely affect flight behavior or is it not relevant?

Yeah, that would change the behavior of the aircraft. If your engine is making 600 lbs of thrust, and the thrust is 4" higher than it should be, then that will create a force that works to lower the nose of the aircraft in flight.

Your canard will need to create an additional 20 lbs of lift when you go from engine at idle power to full power (while in flight). This will create lots of bad issues, such as having to adjust your trim every time you adjust engine power.

Small changes, such as a half inch or so, won't be noticeable.. but 4 1/2" could make your plane a real handful to fly.


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