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


Ok, reversed the direction of the torque [one mouse click and changed one
other setting.. I had it set up w/ 1800lb's /hole rather than 1800lb's total.. one
more mouse click to change than] After re-running it.. here's the results... they
look good to me..:) but then I'm not actually an engineer :)

Jarrett


Thanks Jarrett. That fixed it.  They do look good. As you pointed out
the spools will add stabilization. The deflections as is are down in the
range of less than a thou. The cups are lightly stressed so they could be
trimmed off by 45 degrees. I did not have Jeff do that as it would add to the cost.

 I may have to make some minor iterations having to do the the position of
the RX8 bolt so I'll tweek the higher stress areas to make it better while I am at
it.

Paul Lamar