Paul

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.htmlPaul 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
 computersdue 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

Oops, and here I thought I'd done it correctly. I'll re-do it here
as soon as
I get a second.

Jarrett

Thanks Jarrett sorry about the mix up.

Paul Lamar

No need to be sorry... wasn't your mixup :D

Jarrett

It was me. I was not clear :)

Paul Lamar