Joseph M Berki wrote:

Paul,
        The radiator which I need to have built is 24" X 12" and will

sit next to

a stock Mazda oil cooler.  They will be mounted in a tray under the

main

spar at an angle downward.  A P51 scoop feeds this whit the inlet under
the main gear.  The aft end of the rad/cooler line up just behind

the fron

of the motor looking at it from the side.

Joe

OK I will draw it into the 3D.
Perry mentioned your engine looked a bit too far aft. How far is it

>from the e-shaft pulley to the firewall.

Paul Lamar

Joseph Berki wrote:

Paul,
         It is 27" from the firewall to the bellhousing location where the
ears are bolted.  Used this location because the widest point of the mount
is further forward than plate design making it easier to cowl.  Have you
tested the wedge duct / diffuser?  I thought the Caravan episode was a K&W
duct?  Thanks
Joe

No the Caravan test was a simple wedged shaped duct. The K&W duct has a few
problems for our use. Number one is; it is only valid for rads mounted
perpendicular to the axis of the duct. This means any tilting
of the rad becomes highly configuration sensitive and extensive
development would be required to insure uniform air flow through
the core. You could spend months with a test rig optimizing the
exact shape of the duct. Velocity taps should be used all
over the back side of the rad to insure uniform air flow.

The second major problem is the K&W is too long. In your case
it would be half the length of the fuse :)

BTW Those are real big problems with rads mounted on either
side of the PSRU in a tractor configuration. Thick or thin they
both have the same problems. Nobody is doing their homework on this.

Paul Lamar

Joseph M Berki wrote:

Paul,
         I will look and see if the wedge inlet is doable.  I will get
those dimensions for you also.  If I tilt the tray horizontal and the wedge
shape/scoop hangs down what is the dimension of the back side
diffuser?  What does the wedge inlet look like from the front/back?  

I don't understand the first question.
Inlet area is 25% to 30% of the core area.

Can the scoop opening be smaller than the width of the radiator? 

Yes but the inlet duct cross sections should be constant area up to where
the wedge starts.

Does it need a large area/volume like the K&W? 

No. One of the wedges advantages.

That is one of the reasons I tilted it so
a plenum could be built on the back side of the firewall occupying the
space between the firewall and engine.  I have some ideas for the augmenter
(incorporate the muffler into the augmenter) but there are som NACA reports
I would like to look at but I think they will not be of much help.

Joe

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.