Building the [scratch] Mega Sprite (part 5)

I’m reasonably happy with the ring fin. There were some little gaps along the edges between layers but some yellow glue seems to have filled those pretty well. Now the flat fins. Normally when I paper fins, I cut out the fin, round the leading edge, then wrap a single piece of paper over the…

Building the [scratch] Mega Sprite (part 4)

I bought a piece of balsa. It came from Michael’s and I’m not terribly impressed with it; it’s rather warped. Still, it’s only going to be a thin skin on a thicker, flatter piece, so I think it’ll be all right by the time I’m done. I’m doing the fins like the Mega Mosquito. A…

Fives

The NAR is talking about having local clubs across the country do well-publicized launches, particularly of Saturn V models, on July 20, 2019 — the 50th anniversary of the Apollo 11 landing. We discussed it at our club and we’ll probably do it, especially since the third Saturday is a usual launch day for us.…

Building the [scratch] Mega Sprite (part 3)

Here’s the body tube with cardboard mock fins taped on, and the ring fin around that. Fin size looks pretty near perfect. Could stand to cut them a bit more generous I guess. I trimmed the plywood to size, having initially cut it about a half inch wide before gluing it on. One end isn’t quite…

Building the [scratch] Mega Sprite (part 2)

I did go and get a piece of 1/64″ plywood and I added it as an outside layer on the ring fin. More on that later. The ring fin is about 7 5/8″, maybe 7 11/16″, inside diameter. Let’s call it the latter, 7.688″. BT-80 outside diameter is 2.600″, so the fin height is to…

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…