5" Motor Page 2

5 " Motor Page 2 Click Here for Page 1
For round two we had cases cut from the same 5" x .125" 6061 tube, two for 3 grain and one for a 4 grain.

The nozzles are made from the base of a large electrode used in an arc furnace at a metal foundry, pretty poor quality, but the price is right... Free!


The nozzles came out very nice for free graphite, the 75 mm nozzle is for scale, them are some manly nozzles! The first side of the bulkhead being finished by boring the smoke grain hole to size for the 1" PVC pipe that we cast our smoke grains in.


The grains are plain KNO3/Sorbitol with 1.5" cores, a 24 mm, 75 mm and bottle are for scale, big grains 6.25lb each! The 3 grain motors were flown for the first time on 4-3-2004, more photos on that launch page.


The disassembled motors looked good. In one motor we used two insulating disks on the bulkhead and three on the other, the insulating disks are made from Formica sheet (like used on counter tops). Three is the way to go with a five second burn, the third disk is almost new and the bulkhead is very clean.


The liner worked well, it's paper from Missile Works. The nozzles were not eroded at all in their first firing! In the last picture the sanding marks are still visible from making it! Yes, the picture was taken after the launch!

Best if viewed in Microsoft Explorer 4.0 or above. Send any comments to Webmaster@trailertrashaerospace.com