Here is the preliminary proposed casting.
Would you people want the built in right angle 1 1/2 inch
pipes or would you want it without the pipes so you could
weld on what ever?
Right angle tubing would cost up to $30 each plus welding
so some money could be saved by casting them in.
This also has a couple of brackets for a rear motor mount.
I am still in the design stage so the brackets for the motor mount
will be beefed up somewhat over what is shown here even though the
rear motor mount load is minimal for most motor mount designs.
The availability of the casting will be well in the future but I
have to get the pattern made in the 3D machine soon.
Paul Lamar
Hi Paul,
Your rendering looks like a 12A. The attached 12A photo is the water
pump housing from a 1983 RX-7. (I think it was a 12A.) The second
photo is of the water pump housing for my second gen. 13B. I'm
interested if you are going to make the 13B version. I would vote for
having the pipes included. They could always be sawed off if someone
wanted to weld up their own.
How about extending the mm tabs out farther so that a rod could pass
between the pipes and go to the bottom of the firewall?
Bob White
- - - - - - -
http://www.bob-white.com
N93BD - Rotary Powered BD-4
You are right Bob. I used a 12A end housing to model the preliminary
design. You guys are getting sharp :)
I don't think I would want to run a strut to the bottom of the firewall.
Nothing really wrong with it but it gives me a tiny bit of insecurity
having the strut in compression. Tension is better as it is self
aligning. This is for the Don Dunbar style motor mount where the ball
jointed strut runs straight back to the firewall. Actually I first saw
this type of mount used on one of Everett Hatch's early airplanes.
Paul Lamar
I would like to see a picture or sketch of the Dunbar/Hatch mount. I
have a rod going from the bottom of the engine to the bottom of the
firewall. There dosen't seem to be a lot of lateral movement possible
because of the wide spacing on the front plate. I don't know if what I
have is adequate for flying, I may have to make some mods. I will get
some photos for a critique but it may be a couple of weeks.
Bob White
- - - - - - -
http://www.bob-white.com
N93BD - Rotary Powered BD-4
I don't think I have a picture of the Hatch mount but here are some of
Don Dunbars mount.
Paul Lamar
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