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Believe it or not, wet epoxy.

It is a composites trick to use ca to help stick fabric in a layup when there is a problem. A tiny bit of CA to tack fabric in place. The epoxy acts as a medium speed...

Wool should also work.

Gerald

I have a 54mm with slightly less length of payload bay, and pack a 54" Spherachute in there. It has to be packed a very specific way and yes it is a tight fit. I use 0.8g BP for deployment and it...

Kevlar has some plusses and some minuses. On the plus side, it is relatively low density and has fairly good tension properties - strength and stiffness. It also has excellent vibration damping. On...

6 ft rail, about 1 1/4" per degree off vertical. 10' rail, about half a degree per inch tilt.

Gerald

Black powder residue + moisture = acid. It is corrosive. My terminal blocks are now on the inside of the electronics bay and I pass the ematch wires through a hole in the bulkhead. The hole is sealed...

No I haven't tried Blue Tube. Not knowing what is in it, I'm not super inclined to try. I used PML or other tubes containing phenolic because of the phenolic. Phenolic forms a char layer which is...

Some slight change of plans for the motor for URRF. It turns out that none of the new batch of liners I picked up will fit in my motor case. They are all slightly large. I have one old liner left and...

West has pretty much the lowest Tg of anything you can get your hands on. I've had that discussion with one manufacturer already. I don't think the person listened.

West is readily available but...

Actually, I'd rather see the gel coat cones dropped in favor of alternative methods. Judging from what I've seen, the mold isn't sufficiently rigid. New molds could be pulled from a filament wound...

I picked up a couple 75mm and one 38mm LE phenolic liner and casting tube sets. Initial impression - I'm impressed!

Gerald

The smaller the diameter and the greater the speed, the more important fin alignment becomes. At 3000ft/sec for a 3" diameter rocket, fins misaligned systematically by 0.001" and 10" long fins...

For fin alignment...

I've had a small project of my own on the back burner for a while, but nothing I want to report. At the rate things are going, it may not even happen until next year. But a...

Donjordan,

If you are level 2 and US, ask in the research forum.

Gerald

Unless I'm mistaken, that needs to be attributed to XKCD. That's unless you're the author.

Gerald

It is easy to underestimate the forces involved with rockets. I like to assume that the nosecone could end up with a brief stress at 30G due to sub-optimal recovery and size everything to be able to...

For RasAero, did you enter the exit cone diameter of the nozzle, and is that fully expanded or not? It will affect the results, as will changes in burn time. Drag is lower when the motor is...

There are also acoustic differences due to the geometry of the gas volume. The resonance and damping behavior will be a bit different. Plus for the same impulse, acoustic energy has to pass through a...

"Ve have ways of making you talk!"

Just replace the whole lower section with a motor case and nozzle carrier, and bolt the fins to that!

Gerald

Hi Jon,

Welcome to Rocketry Forum!

You might not have noticed but this thread is about 11 months old. Chances are the chute is no longer available. You can send a PM to the person to inquire......

For the tips of the fins to provide any stabilizing effect to speak of, they need to be thinner than the chord-wise dimension by quite a bit. With this fin shape, they will unfortunately have to be...

I've got a Shockwave I could part with since I haven't used it yet.

Gerald

For smaller (and subsonic) rockets like this, I'd recommend considering push pins. They are more convenient.

Gerald

Thanks Keith; I guess I'm not on the list and neither is a friend of mine. I think we're at 4 telemetrum right now and two or three will have this issue (two having demonstrated it in flight). I'll...

Another thanks to Nick!

http://www.rocketryforum.com/showthread.php?37382-Sprite-6-quot-and-a-baby-O&p=429141#post429141 - you'll have to go through the thread for some details.

In my case the hatch is a segment of a...

http://www.rocketryforum.com/showthread.php?37382-Sprite-6-quot-and-a-baby-O (mine) which was inspired by Jerry O'Sullivan's IRIS (you can search and find info about it, including at vahpr which is...

Tight; I just don't like the concept of something attached with a screw being able to spin.

Gerald

I'm thinking Aeropoxy will wet out the fiberglass just fine. Depending on how tight the weave, you might have to work at it a bit though.

I'm lazy in some ways, and I use a lazy composite trick....