 |
We found that 1.25" X
.120 wall square tubing fits the 8020 rail perfectly, accept that on our
tube the seam was close to the corner causing it to bind, a little work
with a die grinder and sandpaper roll cleaned that up. |
 |
| |
 |
About ¼" from the
bottom we drilled a ¼" hole and welded in a rivet that we had (a rod, bolt
etc. would work) to keep the rail from dropping to the bottom and binding
on any spatter from welding or debris that may fall into the base. On the
back of the adapter we drilled a 5/16" hole and welded a ¼" X 20tpi nut so
that a bolt threaded in the nut goes through the slot and bears on the web
of the rail to keep it from flying with the rocket! On the side we welded
a rivet cut to ½" to wrap igniter wires around. |
 |
| |
 |
On the front of the
adapter we welded a 1" long piece of 3/8" rod for the airframe to rest on.
We checked everything for fit, squared the adapter up on the base and
welded it solid. It turned out very solid, when the two knobs are loosened
about a half a turn and pulled up it releases the legs to fold along side
of the middle leg. |
 |
| |
 |
Here is the launcher
on its first test it launched 8 rockets from a 38 mm Fat Boy to the 28lb
8' tall Black Tester with no problems. The adapter is 8" long but it
probably only needed to be 5" the fit is very good! We fly on a desert
field most of the year its dirt, so we have not fitted a blast deflector,
but it would be easy to do. |
 |
| |
|
|
