Paul--
No, I do not have the cowl. The plans I have for the actual cowl are
very faded (the plans are over 45 years old) and much of the detail for
the interior is missing; however, it drawn on a 1:1 scale and the
distance from the firewall to the prop flange seems to be 33.75". From
the top, (approx. 29" from firewall) the cowl does not narrow until the
nosebowl, at this juncture it appears to be 32" across--give or take.
The attached are PDF files of the "general arrangement" on a scale of
1:10 and all dimensions are given in inches.
If you need more info, I will dig up as much as I can.
Tom
OK Tom I 'll go with what I got so far.
--
Paul Lamar ...No rotor no motor.
Tom, when using Tracy's drive, the minimum distance from the
firewall to the prop flange is around 36.75 inches. This provides
the minimum space between engine and firewall to remove the water
pump. I suggest you consider using a prop to flange distance of 40
inches as this will leave room to mount stuff on the firewall and
also to route the exhaust. Jerry
That is still open Jerry. There is a nose landing gear to contend
with. It may be greater than 40 inches.
Paul Lamar ...No rotor no motor.
Greater than 40 inches is fine. I suggest 40 inches as a practical
distance to have room for a nice installation and 36.75 inches as a
physical limit below which one may not go. Jerry
---------------------------------------------------------
OK this one is 38 inches. Will require a custom pan. The
rear mount will be the strut type down to the nose gear
strut. Might as well use all that structure. This is preliminary
as there are a lot more tubes that support the nose gear strut
I will draw in shortly.
---------------------------------------------------
Here is the nose gear stuff. The yellow green tubes
are already there.
--
Paul Lamar ...No rotor no motor.
Paul--
Thanks for the design. What do you recommend for sizes and thicknesses
of 4130 tubing for the various components?Seems like the top tubes and
those for the nose gear are 5/8" and the bottom are 7/8".
And (pardon my ignorance) in utilizing the schertz beam, what is done
with the firewall end of the engine to stabilize it? Do you recommend
using shims at the firewall to create the various offsets to account for
P factor, etc.?
Tom
Patience Tom. Your getting the design for free :)
No shims. You will see shortly.
-----------------------------------------------------
Your tubes sizes are correct.
Shimming the mount at the firewall moves the prop flange
around alot so it might not fit a cowling.
These dwg's are based on keeping the prop flange in the
center of the cowling. The down thrust can be adjusted slightly
by using a left and right hand threaded rear motor mount rubber
ball joints and strut. I recommend using the 1/2 20 size.
Here are the rear mm dwg's. Oil pan and other dimensions will follow.
--
Paul Lamar ...No rotor no motor.
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