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I'm firmly in the camp of "Use whatever setup makes sense for the project." For example, this SAC project (8.8 lbs of payload to 10,000 feet): Left to right: white nose cone (main chute), red switch band/avionics bay, black body tube (drogue chute), red payload bay, white booster. This is a...

From the perspective of simplified fluid mechanics, yes. Reason being, the terminal velocity equation: Considering the two cases (descent on a single large parachute and descent under two smaller parachutes of equivalent area): The mass (m) shouldn't differ much (couple of extra shroud lines...

There are a whole lot of University teams doing stuff like this. https://spaceportamericacup.com/ If you don't want to dig too much into the details: Take an 8.8 lb payload to 10k or 30k feet on a commercial, off the shelf (COTS) or student researched and developed (SRAD) motor. (Divisions by...

Don't need to thread shear pin holes, often makes them difficult to put in and take out. Sizing so a screw can slide in makes your life easier. Generally want it to be a little tight of a fit, so they don't fall out. (Rule of thumb: Use your thumb. Should be able to press in.) If you drill a...

Roll control was the objective of the Midwest High Power Rocketry Competition a few years ago. Two launches were required. On the first, the objective was to minimize the rocket's roll between burnout and deployment. On the second, the objective was to direct a fixed camera to cardinal...

Had a similar problem with bluetube (and phenolic) coupler with a carbon fiber body tube my team made in house (using bluetube coupler as a mandrel). Couldn't get good ejection in a ground test, vented too much gas. Wound up wrapping a new bluetube coupler with a layer fiberglass we had laying...

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My understanding is that the cloudiness is only surface level, likely caused by moisture. That's why I suggested a bunch of solvent based methods, to melt that layer. I don't know if Future would have the same effect, I haven't used it. But it's probably worth a test or two, if you've got the...

Give it a quick wipe with acetone. Might flow the surface and clear it up. If that doesn't work, resand with 600 and 800, then give it a light coat of your favorite rattle can clearcoat. Bunch of solvents in that, in addition to the clear, which can fill. If that doesn't work, you might need to...

I've been doing HPR as part of a University team for several years. Been reading bits and pieces around here about as long, and it was amazingly helpful, if time consuming. I helped some people build kits for Level 1 certs last year. Since I won't be able to help as much this year, I thought a...