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Thomas,
Not trying to rain on your parade, but why do you
think that something designed to cool a 1500 hp WW2 fighter at speeds over 300
mph and then scaled to fit in your airframe is what you need for your
application?
You should calculate what your particular
situation needs and go from there. The math is not that hard, in fact I think Ed
has a spreadsheet he would probably be willing to share if you asked nicely. I
think he would even run some numbers for you. If you want to make it look like
the P51 installation fine, but size all the radiators, inlets and exits for your
speed, altitude and power levels. Then draw the P51 like scoop around that
and see if it still fits.
1.) determine how much HP you plan to make
continuously.
2.) figure out how much heat will be rejected at
that HP.
3.) figure out how fast your airplane will go with
that much HP.
4.) size inlet and exit accordingly.
5.) Check over range of altitudes repeat step 4 and
5.
6.) look at hot day takeoff and climb. size max
exit opening for that.
7.) compare your results to the other flying
examples closest to your application for a sanity check
8.) If you are the outlier you better understand
why or start over
I would look very closely at what Al G has done as
well as others successfully flying canard aircraft with rotaries. They have much
more in common with your application than the P51.
Monty
----- Original Message -----
Sent: Friday, January 29, 2010 9:36
AM
Subject: [FlyRotary] Tiff to CAD
Software
In
my efforts to transpose the TIFF image format of a Microfiche image of a hand
drafted blue print of the P-51 scoop and related
drawings.
As
you might imagine, just dealing with the grainy images is in itself somewhat
difficult but trying to translate it into a CAD drawing is even more
daunting.
SOLUTION:
I
scratched up a software program yesterday that will allow me to do the
following.
·
Import
a graphic file.
·
Determine
the scale (pixels to inch)
·
Select
a start point (lower left corner of my converted image)
·
Allow
me to trace the drawing and convert it to a CAD script using mouse clicks to
define points of the drawing.
It’s
more of a prototype at the moment but I can make it into a deployable
application once I make a few enhancements. I tested it on three of the images
yesterday and totally blew through the process creating scripts for the
radiator exhaust door, oil cooler exhaust door, front profile of the scoop
(oil cooler forward) and all the associated bulkhead drawings in a couple
hours.
The
end result is I can scale the scoop drawings at roughly 61% and have a full
size drawing to use as templates, etc. for my application. I plan of plotting
these out full size this weekend and start on the actual fabrication of the
scoop & diffuser.
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