> >Jerry,

 >
 >I had this idea quite some time ago but have not had
 >time to knock it out in Rhino. I think you
 >will find this much easier to fab than my original idea
 >of the aluminum spacers and rolled 3/16 sheet aluminum
 >tig welded to the spacers. You can weld this up anyway
 >you wish. It uses 1/2" 4130 .035 wall tubing bent using
 >a plywood form. The radius is about 7 inches. Heat the tubing,
 >clamp one end and pull it around the plywood form.
 >Not all diagonals will be needed to be bent to clear the
 >starter ring gear.
 >
 >I have never been entirely comfortable with the aluminum
 >block configuration for several reasons. High weight among
 >them. I like this idea a lot better.
 >
 >Paul Lamar

 Excellent idea.  Are the spools 3/4 inch o.d.?.  I have made steel
 tube benders before.  Half or 3/4" can be bent cold to 7" radiius.
 Nice thing is, this can be retrofitted to existing MMPs.

 --
 Jerry Hey

 Tailwind & Rotary Engine Support

 http://www.j-winddesigns.com

 mailto:j-winddesigns@thegrid.net

You only need a welded on washer on the aluminum side of the spool.
The rest of the spool can be made from 1/2 inch .049 wall tubing.
That should give about a 10 MM (.3937") ID. Run an "X" (.3970")
size drill through them to clean them out. One or two will have
to be turned on a lath because of the hollow dowel pins extending
out of the rear end housing. On those two spools extend them into
counter bores in the back side of the  motor plate to locate it.

Lets see about 16 inch diameter 50 inches of 1/2 at .035 is about
.8 pounds for the diagonals. Lets say one pound. .4 pounds for the
spools. Should weigh around a pound and half for the whole thing.

BTW on the starter side one short straight one will do between
the starter bolt and the 10 mm bell housing bolt.
Not shown in the rendering. Here is a pic.

Consider me as your first customer. I hereby order one
as soon as you can get it done.

O.K.  This is a neat project.    No need to ream the .049 of which I
have an abundance of small,  here-to-for  useless pieces from the
Lycoming engine mounts.  The 10mm bolt is a perfect non interference
fit.    Give me a month or six weeks

The designer gets a complementary sample.    Jerry

Thanks Jerry.

Paul Lamar
 
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