Jerry,
I just talked to Ken at Vans. Stonewall. Call back next
Monday. I don't
have access to those drawings. The rotary has too many
problems. Just
get the mount from us and match drill it to the firewall.
etc., etc.,
etc. The one thing that he did say was that he thought the exact
location wasn't too critical. 'If you get it within 1/4" it will
probably be all right.' This from an "engineer!"
Rats. <other expletives deleted>
I notice that Conversion Concepts offsets the engine 1 degree.
To the
right for the RWS RD-1C 2.85 redrive. But that doesn't help much.
Where do we go from here?
Doc
No problem Doc we got it. If you have the cowl measure the lenght
of it to the prop flange hole from the back while
it is sitting on the floor pointing up. Most are 39 inches.
Paul Lamar ...No rotor no motor.
Don't have the cowl yet. Should I order it now? Conversion
Concepts says to
order the O-320 as it is longer than the O-360; but this is
kind of moot as
Vans doesn't approve of the O-360 in the 9. What do you think
of the James
cowl? All I have heard is that it is superior aerodynamically
and results in
~ 7 kt. speed improvement.
Doc
The James cowl is good. Better for the rotary.
We will need the length. I might have it. I'll look
around. Yep I have it. It is 37 inches long.
Paul Lamar ...No rotor no motor.
Doc
My C of G on the RV7 came out one American inch behind the usual
O 360
position with CC mount,James Cowl and Tracy box. There is lots
to cut off
the James Cowl, so you could position your engine further forward.
Ian.
Thanks Ian for the good news. Lighter is better.
Jerry Hey will be building the mount. You get this, Jerry?
Doc
Yes,I am looking forward to seeing how Paul handles the nose gear
socket. I am sure he will come up with a good design. This will be
the first time for me to build an SBeam mount with the nose gear a
part of the mount. The nose gear structure should be a good place for
the rear strut. Jerry
It will look exactly like this mount except the following
tubes will be kept.
The best way to do it and probably cheaper in the long run
and much more likely to fit perfectly is start with a Lyc
mount and cut way what you are not going to use.
--
Paul Lamar ...No rotor no motor.
I agree that would be easiest. Jerry
-----------------------------------------
Here are some jpgs of the RV6A motor mount.
Not final yet. The beam is not shown. Bushings
too close together.
Paul Lamar ...No rotor no motor.
-----------------------------------------------
Here is the engine super imposed on the James cowl
side view.
Ian is this about what yours looks like?
--
> Paul Lamar ...No rotor no motor.
Great drawing Paul.
Mine does not have the nose wheel. Much better for forced landings. My
engine is a little closer to the firewall. The James cowl is very close
to
the top of the engine. Too close to run the inlet pipes over the top.
Also
the space underneath is the wrong shape for a flat oil and water cooler
arrangement. The sump is closer than on your drawing. Sump to cowl is
250mm
except in the center where it is more and follows through to the exit
duct
area.
There is room if the oil and water rads are positioned in a vertical
wedge
shape. From memory my water (Evans) cooler is 250mm X about 600, (same
length as the Mazda oil cooler) X 50mm.
Ian in Perth
Looks like the trade off for a pointy nose is not worth
the loss of volume under the cowl in the places we
need it. However that is an RV8 cowl and not a RV9A cowl.
Was your James cowl specifically for a an RV7?
Paul Lamar ...No rotor no motor.
It was ordered for the RV7.
Ian
Thanks Ian.
I asked for a dwg from Will James. We shall see what I get.
In the mean time could you please take a couple of pictures for
me? One from the side about the same height above the ground.
And one from ladder looking down at the top of the cowl more
or less. You don't have to be suspended above the airplane.
Perhaps with the cowl off just sitting on its back side.
I can scale a lot off a few pictures.
Thanks.
Paul Lamar ...No rotor no motor.
OK Paul
It might be a few days. Don't forget the pulse length and voltage. I am not
going to fly again until it is sorted. Local Mazda say that there has never
been a failure of the igniters. I think the testers may have tried max and
min voltages testing on my engine.
Non Flying RV7 Ian.
I'll be working on the RX8 pulse length and voltage today.
I got a temporary parole from SWMBO.
Paul Lamar ...No rotor no motor.
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