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.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
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