Paul

 are you sure you want to use 7075??
 I have a great source for 7050 with certs cheap cheap cheap it's all
 boeing scrap.
 maore than you will ever use. My machine is not being used at the moment.
 I can machine the plates and squares
 if you send me the drawings.

 Tony

 I'll get back to you when I get back from check rides Tony.
 What dwg format can you use. We might try a built in planet
 carrier on the 4 inch aluminum shaft.

 Perhaps Ed needs something right at the moment?

 Paul Lamar


 This picture will give you a feel for the strength and robustness
 of this type of four inch diameter aluminum prop shaft  PSRU.


 Paul Lamar


 That looks like it otta handle it. The shafts on the 2.85 are 4.17", which
 leaves me with perhaps a .020 wall thickness; if I edm for 3/8 bolts. I
 could likely find 9mm bolts and end up with about .030". I don't know what
 the limit is for the lazer, or the minimum needed to provide a good surface
 for the pinion bearings to ride on.

 Ed Carver


I have opened an order with Sunshine metals. Order pending receipt of in
house credit app. and fund transfer. The base price for 28 inches of 4.25"
7075 t73 round bar is $205, of which you want 14". Tax and shipping will be
added to the end total.
This company will not let me pick it up directly:(

Ed Carver


OK Ed I am in for half.

------------------------------------------------------------

Ed, this is what the housing casting will look like more or less.

Most of the thick stuff at the back will be machined away to
leave a 3/8th thick flange to fit this bell housing.
Some of the gearbox will extend into the bell housing.

The idea here to keep the overall length, from block to
prop flange the same 14.5 inches as Tracy's and Ross's gear boxes.

It is  a trade off to make the pattern simple and cut
the overall cost of the casting. No core box is required.
However more molten aluminum is used.

As shown the casting is ten pounds but 3.4 pounds of that
will be machined away. Total housing weight will then be
about 7 pounds more or less.


Paul Lamar