Paul,

I got the files and have the material here...I have enough to
make at least 8 plates.I will make 1 for inspection, then if you
want more...... the pressure caps can be done as well.. get the
geom and advise on material.... jeff

OK do we have any other  buyers? Speak up now.

Paul Lamar

Paul, can you publish the list
of those that spoke up so we can verify you have us down...
Count me in. Mike C. I don't have a list.


People should contact Jeff  directly.
jeff doddridge <4starr@cox.net

Paul Lamar
Paul, I  was reflecting on the beam plate design, in it's present
configuration. I  notice that the Barry cups are in essence butt
welded to the ends of the  beam. Given that the welding process
destroys the heat-treat properties of  the aluminum in the heat
afected zone, is this method of attachment strong  enough to hold
the engine and absorb all of the forces incurred? I'm not  an
engineer, but I do understand the welding process, so please
don't  take offense. I'm just posing a question.
C. Smith

Absolutely.
If you  take a 6.5 G hard landing drop in and assume the engine
weighs  300
pounds the shear force on the welds is 2000 pounds.
Lets assume for  the moment all force is applied to only
one cup. The one closest to the  engine.
If the total weld area taking both sides of the cup is .25 inch  by
3 inch long
that is an area of .75 inch. .125" per side.   Therefor the stress
is 2000 / .75
or 2,666 psi. The  tig weld  tensile strength is given in this
referencea about 25,000 psi so we have a  factor of safety of 10.
http://www.aps.anl.gov/Science/Publications/lsnotes/ls254/ls254.html
Paul  Lamar
Which is a HUGE under estimate. We are allowed to use  75Ksi in all
our welds here at my day job. [in 44w plate] W/  7018 [or equal]
welding materials.
[We're  talking MIG or Stick however.. I'm not sure about tig]
Fwiw


Jarrett
Would/could you please do an FEA with 700 ft  pounds of torque
combined  with 1800 pounds of down force  :)
Like Bob White crash. Full power full stall drop in crash  landing.
Paul Lamar
K, 700 torque thru the  bolt circle /mount holes. 1800lb's
vertical force, do we have any
coupled force from the weight of the engine and mounts deflecting?
Exact material? Are we talking a 3/8" weld fillet either side?
Btw,  I've now realized that your talking Aluminum, my weld strength
numbers [sited] are for 44w [steel].. just for the record :)
Jarrett
3/8th sounds about right.
I assume 6061 T6 at  least I hope so.
Paul Lamar

Forgot to ask, what is the  'book value' on the c-c distance
between the barry cups?
Thanks
Jarrett

21.750" center to center on the  cups.
The torque direction is the same as a standard prop
Looking  at it from the front it is counter clockwise.
Paul  lamar

Paul, I finally got this done yestarday. Had some issues  w/ my computers
due to stupid IT problems.. but thats a whole other  story :)

It looks like this is a pretty good solution. We're  seeing excessive
deflection
on the plate from the vertical which  actually wouldn't happen because of
the block stablizing the  plate.  I may play a bit more w/ this later here
and
see if I  can't get an even more realistic evaluation. Suffice to say that
it  looks good at this point.

Jarrett
I think we have the torque  backwards. Looking at the prop... from in front
of it
.... it  rotates counter clockwise. There fore the torque on the plate is
clockwise.
If the purple arrows are the direction they are  wrong.

The right mount from the pilots point of view has an  upload and the left
mount
has a down load.

Paul  Lamar



I'm interested in one.....$?
Marc  Wiese

Jeff?

Paul Lamar

Since you have gone this far, might as well just make the entire redrive !
! !

I would be interested in one, any word on teh cost ???

Stuart

I tend to agree :)

Paul Lamar