Building the [scratch] Mega Sprite (part 1)

There was a rocket club meeting last night, and we brought Sprite-like objects. There was one nice mostly-assembled 3D Rocketry Circulus 3. There was one nice scratch BT-60 upscale. There were two Semroc clones, mine and a nice one. The other builder hadn’t primed and sanded before putting the ring and fin tips on, and…

Building the Semroc Sprite (part 5)

So I did more sanding and priming and sanding, and I glued the nose cone on, and I filled some dents and the nose/body seam with Bondo spot putty and sanded some more, and I went to put the ring fin on after, as the instructions recommend, sanding the fins down to achieve a snug…

Building the Semroc Sprite (part 4)

This isn’t normally painting season, but I want to apply and sand primer on the body and flat fins before adding the ring and fin tips, and I don’t want to postpone further work until May. So, after some cursory wood filler application on the fins, I took room temperature paint and rocket out into…

Building the Semroc Sprite (part 3)

The dried contact cement is… improved. Might never be beautiful. These days if I can remember to I prefer to glue launch lugs on before fins, so I did that. Much easier to line it up without fins in the way, especially these fins. These unshaped fins. The instructions specifically tell you not to shape…

Building the Semroc Sprite (part 2)

Start with the motor mount which, by volume at least, is nearly the entire rocket. The motor hook goes on the outside of the body tube, and then the Tyvek piece gets glued over that. (It was gauze in the original K-15.) I tried using yellow glue for that, but the Tyvek didn’t seem very…

Building the Semroc Sprite (part 1)

For its winter project, the Syracuse Rocket Club is making Sprites. This isn’t a group build of a single rocket but individual builds of a single design: the K-15 Estes Sprite, or Astron Sprite as it was first known when introduced in 1964. Looks like its first catalog appearance was 1966. I suppose if any…

Repairing giveaway rockets (part 5)

I’ve been dealing with a couple more giveaway rockets. I don’t know their history. Looks like both are based on failed rockets, but there are things I can only guess at. First rocket: There’s a piece of body tube, painted and with a sticker on it, with launch lug, engine block, and nose cone glued…