Ok  Paul,

Sorry but I am going in circles again. I can understand the concerns of a
heavy flywheel going at 7,000 rpms. If it broke loose it would take out the
engine stand and sheet metal wall.

Wouldn't it be safer to remount the transmission and bellhousing and attach
a prop to the transmission output and engage  2nd gear.?  It will be a long
unit but they have been designed to work together:)

Paul since you have seen the workshop I use, it would be much easier for me
to whip something up in metal.

How about this?  Two or three equally weighted 34 "long   3.2mm thick 1 "
diameter pipes with sheet metal paddles welded onto the last third. The
center hub would be made from a piece of 6 in. diameter 6mm thick pipe with
a  backing plate welded on with 4 holes drilled into it to attach to the
transmission outlet drive. Whole thing mass balanced of course.

In addition he central hub needs three bosses to reinforce each hole around
the prop shafts.  The props could be rotated and locked in place (rotation
only) with set screws.  To keep them from going into orbit a ring can be
welded to each pipe on the inside of the hub.


I tried to draw it but I got stuck. I could probably make it faster:)

Doug in Japan

Your pulling my leg right? This thing will do real damage when
it throws one tube/blade at 2700 RPM. Make sure my buddy Yutaro is not
within a mile from this thing when you fire it up.

Stick with the wood design.
Paul Lamar ...No rotor no motor.

Paul

OK that is just as well as I checked out the old tranny today.  As you
suspected it is totally scrap.  Sitting in the rain and snow for several
gears apparently did it no good.   So its back to the wood unit you showed
and a bomb shelter for the cat:)  He likes to watch me work but he has to
stay home when I fire this one up.  Question Is plywood acceptable for this
spiral prop?


Doug Fir

That thing sat in the rain and snow for thirty years :)

Depends on the plywood. Most plywood has a low grade core which
just adds to the mass with out the tensile strength. Best to use
stright grain lumber. I know it is enpensive.

Paul Lamar ...No rotor no motor.

I would not use plywood, even aircraft plywood may not be strong enough.
Use lightweight hardwoods, the same ones use to make props.
Maple is what I used. You may have to go to a specialty hardwood store.

Perry Mick


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