X-Mozilla-Keys:                                                                                 

Don Moncrieff wrote:

I'm a new kid on the 13 B block--getting a lot out of the Linux powered
conference.
My 13 B with stock turbo is going (hopefully) to fly a Coot.
Since the engine will be on a pylon and the prop will be pushing I have
room for whatever configuration seems good.
For a reduction drive I'd like to have a 9 or 10 inch offset. Any
advice? A trustworthy supplier?

On the turbo I'm thinking of leaving the waste gate valve controlled
automatically as in car use and making the switching actuator cockpit
controllable by connecting the wires of the solenoid valve to a switch
in the cockpit and leaving the vacuum tubes as set up in the car. Any
advice?
Thanks.
Don Moncrieff

Well Don I think you should use a planetary as the 9 or 10 inch
offset is going to add to the over all cross sectional area
of the Coot reducing its performance. You need to get
the engine up there as close to the center of the prop
disk as possible. The rotary is ideal in this regard
as it will almost fit in a 18 inch diameter cylinder.

You might however put the engine in the back
seat and use a really LOOOONG belt :-)

I also think you might need
a 3:1 PSRU and a really big dia prop to get plenty of static thrust
to get that baby up on the step. The one 13B rotary Coot in Oregon
that I know about is using nitrous oxide to help get it
up on the step and out of the water.

I can't say on the turbo question as I have never had any
experience with them. Perhps Paul Yaw can help you on that as
he has just completed a 13B turbo rotary engine for a sea plane.

Paul Lamar

Jeff Spitzer wrote:

Maybe for a pylon mount he'd be better off putting the engine low and
cramming all the junk above it.  Remember, Paul, you're thinking about
"normal" engine integration problems.  Plus, he doesn't necessarily have
excess space on the sides due to a 40" wide fuselage.  It's a pod!  If I
were doing a pylon pod, I'd want the engine on the bottom too.

Jeff Spitzer

 
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