George,
  I'm in no hurry.  I still have a lot of work to do to the Long EZ

before

I'm ready to Mount the Engine (engine is still in the crate), maybe

3-4

months when I get back to work on it..  Just moved and changed jobs so

I

still have to unpack and set up the shop... Right now, I'm collecting

parts

and dreaming of when I can get back on task...  Your new bell housing

will

be a sweat touch...  question: I thought you would test the prototype

to

failure?? (i.e. bolt it on to a fixture and hang weights on an arm

until

if

cracks or deforms, so we will have an idea of where it will fail or

can

that

be predicted based on your modeling).

Mike C.
Long EZ, Long nose, 13 BREW

No point in that. We know what kind of gyro induced bending loads a prop

applies

to the bell housing so we will test it for stiffness when subjected to

those

loads. Namely 600 foot pounds. The failure stress level is way beyond

what

is

required for adequate stiffness. We will probably use the same equipment

Jerry

Hey used to test the motor plate for stiffness. Hopefully Jerry still

has

most

of the test rig parts. Jerry? The test applies twice the expected

torque.

Stiffness in the bell housing is required to keep Tracy's input shaft in
reasonable alignment when the aircraft is subjected to turbulent or

violent

maneuvers such as a stall or spin.

Paul Lamar

Mike,
I thought you wanted a bellhousing for your new machine 'Cosman Pacific
Flyer' - what's this Long Ez business.

Paul,
That's one awesome test rig, isn't it - my poor bellhousing !!
If it stands up well in that apparatus it will stand up to anything !

Paul & Butch,
Important question on the side wall stop (engine mount hump, at the top) .
I'm concerned that a straight cut in the top corner will induce a stress
area - should it be curved (concave) in this corner or am I overly
concerned.
George (down under)

Use a ball end mill.

Paul Lamar

George, I'm building a Long EZ.. The bellhousing shouldn't care.. or am I
missing something.  I was thinking the bellhousing would look a lot nicer
than the aluminum plate I currently have..

Mike C.

 
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