Crayon 3E A lightweight Crayon packing triple 24mm mounts |
 |  |  |  |  |
| Lets start this build with motor mount tubes, first cut three 24mm heavy wall tubes at 12" or ye, doesn't matter as long as they're all the same length... |
| Then glue or epoxy two of them together on a flat surface like a tabletop. I used Titebond II yellow glue, it'll be plenty strong... |
| Once the two tubes have dried up enough to handle I glued the third one on the top, then used some 30min epoxy to attach the screw eye on top end for a rock solid shockie mount. |
| ...And a #8-32 bolt on the bottom. Fits better if you cut the head off first or use allthread. I used stainless steel hardware for both ends, since I got a habit of over engineering.... |
While the glue and epoxy on the MMT's were curing, I doodled up a plan for the fins. Just 1/8" 3-ply lite plywood from Michaels, Homer Teapot or Lowe's do fine too... |
The fins got cut out, and since the idea with this bird is to keep it low and slow, all the edges were left square. Root edges got beveled for wedge mounting... |
I used my fabulous (NOT) cheap (YES) Chinese drill press and burned a couple of cluster CR's out of 1/8" 3-ply lite plywood. Triple 24mm MMT's will do on this one... |
...since it ain't gonna be no HotRod. CR's got glued on and filleted withTitebond II yellow glue. You can use epoxy as well, but it makes things heavy really quick... |
Tack on the fins next so they butt on the aft centering ring, gives them quite a bit more strength. Then lay up two or three fillets and hang up the fincan to dry. A crystal I got from a late friend of mine radiates positive karma to the heart of a new rocket for good luck. Rest easy James 'Jim' McNair, you'll never be forgotten... |
It's time to work on the nose cone, first cut a disk of 1/8" ply to fit inside the Crayon plastic cone and bolt on a screw eye or like, scuff up the inside of the cone with coarse sandpaper, and use some 'Guerilla Glue' to put it all together. Follow the directions and lightly moisten the disk... |
...Then run a bead of glue on the inside shoulder of the cone, slip the disk in place and set a weight on top. I used a heavy piece of steel tubing left over from some other crazy project of mine... Finished nose cone assembly on the left. |