Rocket Recovery

i need to make a bottle rocket for school?

i need to make a rocket with a recovery system like a parashoot. im using a 2 leter bottle and what ever rocket takes to longest to hit the ground wins. so i need to know how much to fill it up with water, what kind and how many fins to put on it what kind of nose cone on the parashoot so if someone has advice or a website plz i need help.

I think you mean a model rocket, not a bottle rocket. There is no recovery system for bottle rockets. I’ve never heard of one made of a bottle, but you could probably make one (my husband made one out of a salt shaker as a kid). They typically have 3 or 4 fins, a cardboard body tube, and a plastic or blasa nose cone. You go to a nearby hobby shop to get these, or check online. If you go to a hobby shop, take your bottle with you, so you’ll be able to measure it against the nose cones and body tubes. Take a body tube a little smaller than the hole in the top, drill a hole the same size in the bottom, and use the cardboard tube as your rocket inside the bottle. The nose cone should be the size that fits inside the body tube. I think the size you’re looking for would be a B20 body tube and a NC20 nose cone. When you get it home, cut it an inch or so taller than the bottle.

When you build, you might want to see if you can find pre-cut fins. If not, they should be made of balsa wood (also available at the hobby shop in sheets). About 1/8″ or 3/16″ balsa should work. When you cut them, start with 1, then use it as the template for the others. The leading edge (the one that fits against the rocket) should be the one that goes with the grain or the balsa might shred in flight (aka exceeding the speed of balsa). Make a paper template of the end of the bottle, and divide it into how ever many fins you have, making them equidistant from one another. Mark the bottom of the bottle there, then draw a line about 3″straight from that mark up, keeping it straight. That’s the line where the fins will attach.

When you cut your fins, use an x-acto knife. After the first one is cut, as I said, use it as the template, and once they’re all cut, set them together, like bread on a sandwich. Set down some fine grit sandpaper and gripping them all together in the exact same position, sand the two sides that don’t fit against the rocket. Put a thin bead of glue along the lead edge, and let it set for about 10 minutes (let it set over the edge of the table so it doesn’t get glue all over). Once it’s set, put another bead of glue along it and hold it in place along the bottle until it sets (chances are good they’ll come off a few times, but it even happens to master rocketmakers, so don’t worry).

While that’s setting up, work with the body tube. There are small rings called motor mounts that you can also buy at the hobby shop. You’ll need one of these. The motor will fit inside the body tube (you also get the motors at the hobby shop), and the motor mount keeps it from going too far into the body tube. Take the motor mount and put glue all the way around the outside of it, then push it into the body tube (the end that will go on the same end as the fins). Use a motor to push it in, leaving it so that the motor sticks between 1/2″ and 1″ out of the body tube. Let it dry.

The nose cone is a little more complicated, because you’re dealing with a lot of different things. You’ll need the cone, a metal screw eye, a piece of 1/4″ elastic about twice the length of your rocket, and a parachute. Start by cutting two small (1/4-1/2″) parallel slits about 1/2″ long (lengthwise) starting about 2″ from the top of the body tube.

Push the cardboard in the center in slightly, and thread about 2″ of the elastic through the hole from the inside. Glue it in place (on the inside of the tube). Take the nose cone and screw the screw eye into the bottom of it right in the center. Then tie the other end of the elastic to there.

My husband makes parachutes, so if you want some of his, go to jonrockets.com and order a Hartle Engineering parachute. Otherwise, you can buy some from the hobby store (I like his quality better, and I may be prejudiced, but all the rocketeers he knows like them better, and so do the rocket companies that use them). You’ll need to take the strings and cut them into 3 or 4 lengths (depending on whether the parachute is hexagonal or octagonal), put the reinforcements on the holes of the parachute, and tie the ends of the strings to each hole (one next to the other all the way around). Tie the center (now the ends of the strings at the bottom) together so it looks just a regular parachute. You can either tie that to the screw eye, along with the elastic, or you can fit it to a snap swivel like you use for fishing and snap that to the eye (that way you’ll be able to change parachutes quickly).

After all this, run a line of glue along the holes in your bottle and fit your body tube into it (the extra length should be at the top). let it set up, and you have a rocket!

When it’s time to launch, I have a few recommendations: use as big a parachute as you can fit in the body tube (18″ should

Supersonic Speed Demons – Rocket Recovery

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