Paul,   next week I will celebrate my 68th birthday.  So far it has
   been fun.

    One change I am going to make is that I will no longer supply
   complete motor mounts.

   I am very interested in supplying a kit which includes the s-beam,
  oil
   pan and rear beam ready to bolt on with the appropriate Barry
   Mounts.   This is for the 13B, the Renesis, and the 20B. I have
   templates for all these.  Once these are bolted to the engine and
 the
   engine is jigged in place in front of the fuselage,  it is just  a
   matter of fitting the tubes. I have built a number of engine
  mounts in
   this manner and it is difficult to go wrong.

    BTW, while I prefer TIG welding, perfectly adequate welds can be
   done with a mig welder or Oxy/Actl.   For those who cannot weld,
  it is
   fun to learn and local community colleges have courses, the EAA is
   ready to  help, there are a ton of books and videos to show the
way.
   Just practice  until your welds are good enough for aircraft,
  usually
   a couple of hours is enough.   Or a local gun slinger can be hired.

   Jerry


   Sorry to hear that Jerry. What are you going to do with the jig?
   Do you know a local welder than can take over the jig. Keep me
   informed.

   Paul Lamar

  I will hold on to the jig for a bit to see if I change my mind. I
  could not bring myself to hand it over to someone who is not a
  talented, fully committed,  rotor head.  I will be glad to discuss
 the
  fixture in detail  with anyone who would like to build their
own.  It
  is not a small project.

    I am convinced the best way is to use the actual fuselage/firewall
  as a fixture.  An added advantage is that with the engine parked in
  front  of the firewall, it is a good time to think about cooling,
  intake and exhaust.

  Jerry

  With all due respect on the welding process,  MIG welding vs TIG
  welding really shouldn't be put into the same category. To MIG weld
  4130 correctly, a fair bit of training, special welder, more
training
  and a full understanding of the process should happen. Though the
  process can be made to look good, without the above in mind,
would be
  hard pressed to prove that it is good.  There are a few companies
  that do have all the requirements to make this happen.. but only a
  few.

      TIG  welding has been proven, tested over time and works. The few
  things that can go wrong with TIG welding show up immediately and
can
  be corrected.  MIG  induced cracks and stress points in tubing do
not
  show up so quickly.

      This has been proven over and over by people far smarter than I.

  We produce many specialized aircraft parts in the shop and try to
  study all of this to full extent.


  Scott- Iron Design L.L.C.

  You are welcome to your opinion,  but I have not found it difficult
  to set up the MIG welder to weld .049 wall 4130 which is the typical
  engine mount weld.  Do a few welds, test to destruction, adjust as
  required... continue this process until you are obtaining
  predictable, adequate results.  It is not a big deal. Be honest with
  your self when evaluating the test welds.

   A number FAA certified  aircraft such as the Decathelon, are built
  with MIG welding.  The FAA does not prohibit any type of welding.
  They do have standards for the RESULTS.    A 110 Volt MIG welder
  would cost about the same as a Oxy/Actl with torches and either one
  can be used to weld  aircraft.  BTW. if one is willing to practice,
  Oxy/Actl is very compelling. Thousands of EAA home builders have
  taught themselves to torch weld and have gone on to build nice
  aircraft.

  Jerry


  Jerry,
 I fully agree that MIG welding can be done, and yes as you said
 American Champion aircraft does do this process. As well as Aviat.

 As long as the new welder ( a person that decides he is going to
 build an airplane) does all the things you mention for testing...then
 great.. I guess the point I was trying to make, was if someone was to
 take  your fixture and decide they are going to start in and build
 mounts by MIG weldng them.. and do this without through testing..
 that I think would be mistake.

 With enough skill and process study...anything can work.

 The comfort level to a known strength is highest with gas welding-
 then tig- then MIG for 4130N material for new builders.

 I won't say any more.

 cheers

 Scott- Iron Design L.L.C.

 Cheers Scott, we agree in all points.   What  parts does your
 company produce?  Could you build engine mounts?  Jerry



Jerry,
    I build frames, tail feathers, tail wheels, motor mounts for ly-360
type 1's, main landing gears, rod spring stingers for tail wheel,
seats, control sticks, tork tubes and the list goes on.  If we feel
we (my brother and I) can't produce the best part for the best price,
we keep doing what we have been. The parts we make we do very well.
The basis of most of my work are Super cub type planes.   The Patrol
to be exact. 2 seat tandem.  But I also make hard fixtures for nearly
any part.
    I  use solidworks, to verify and design..(or the other way around)
I will follow this right up with just a few photos of work produced.
Scott