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Ah, but if you did it in rod-and-tube configuration....

Or if you made it one long grain, with the fastest propellant on the inside and the slowest on the outside...

Pink motors are often mixed red and blue grains.

I posted a video of the Radical Rocketeers launch.

I would ground test to find out. How big is the volume the motor needs to pressurize? You may need to add black powder (form a small cup with tape over the front of the motor).

Steadycam + optical sight. If you're looking at the screen, it's much harder to follow fast-moving rockets, but when you're looking at the real thing it's easy. The steadycam helps suppress shake.

http://www.youtube.com/watch?v=W6HhH-VuY8Q

Did you have to dump the cat out of the box? I've been curious.

Regarding that USC rocket, the heat got to the shoulder from the hotter, forward-facing parts of the nosecone via the carbon fiber. Regardless, I would always worry about West Systems softening, even...

I got the chance to see a TruCore motor in person last weekend, a 54mm, with a turned integral thrust ring. Pretty sweet.

I've always wondered this myself. The UI is far from clear and the documentation isn't helpful either in this particular situation.



Open OR, and then do file->open to open the Rocksim file. Do...

Caveat on what I wrote earlier: I hardly have spaghetti.

I prefer other pasta, like radiatore (which look like little heatsinks or car radiators...hence the name), which hold tons of pesto.

Or...

It depends. Sometimes the additional lever arm inside the rocket is nice (when the MMT is much smaller than the body tube), but other times the integrity of the airframe is more beneficial than a...

By "cruddy stuff underneath", I meant lesser adhesives like CA and 5-minute epoxy which, once covered up, do little aside from take up valuable bond area.

Dado slots are convenient, but a good fin...

Sauce mixed in.

But not just any watery soupy sauce, but crushed tomatoes boiled down to their thick, rich, flavorful essence.

I've stopped tacking fins on. It's 100% worth the time needed to glue them all in separately, if you don't have to deal with the cruddy stuff underneath.

Thermistors have a pretty slow response time.

That said, response time is exactly the thing: the motor stops producing thrust before the epoxy gets the chance to heat up, unless you're dealing...

It gets warm but not nearly enough to warrant JB Weld.

That's why I use the same popsicle stick I used for mixing. It takes a steady hand for a good fillet, but you get a fresh one every time.

Even so, it is amazing that all the thrust of an L2300G is held back by a thin little glue strip, keeping the motor from barreling straight through the rocket.

You don't even need that for an L3000.

On my L2300G-powered research rockets, all of the thrust goes through a 3/4" wide shear joint between an aluminum bulkhead and the inside of the 3"...

My suspicion is that being such a long rocket, the critical angle of attack before the rocket becomes unstable is fairly small. With the airframe flexing back and forth like that, the rocket reached...

Wow, overkill much?

If that's 54mm tubing, and the fincan is about 5 inches long, then there are about 35 square inches of contact area. West doesn't give a lap shear strength, but if it were...

I would size it for Loki motors, and cut a thin ring of 3" tube to slip over the AT case to keep it from sloshing around.

I... guess RadRock is my launch site, now that I'm back from school in Cali.

You have to see a Prefect or similarly high-ranking TRA person to take the test, but at the last launch Randy Appelbaum...

Like Troj said, the Tripoli Mentoring Program is your best bet. The contact with a more experienced member is very helpful. When I get my L2 status sorted out, if I'm still in the NJ area I'd be glad...

What weird attachment? You don't want to remove material, just rough up the surface. Though that's probably not needed anyway. Sorry about ruining your excuse.

Both will work well. Pick the one you prefer to work with.

Rough up the inside of the fincan and that will give better bond strength than drilling holes will.

Heat won't penetrate the paper tube fast enough to make too much difference. The bond area for an Acme fin can is enormous, so even if some strength is lost there is an excessive amount of reserve...

It depends on your deployment strategy. If you eject only the nosecone, the bundle coming out is critical. However, if you have the av-bay in the nosecone blow the rocket apart at the midpoint, then...

Longer wires are probably in order for the cable cutter.