Well for now I need something to keep it from separating at the coupler that will be the av bay in a couple of months.
Another is that I have a couple of rockets that are tall. Too tall for transport. Like my mean machine I finished tonight. I need to use something very light weight to pin the coupler for launch.
Shear pins are good to prevent drag separation, which happens at higher altitudes.
So why are you bothering with shear pins?
I know shear pins are the new "in" thing, but I never used shear pins til I flew my L3 rocket, and only because my TAP said I needed them (not that I argued). A properly fitted friction fit will work on any rocket. I've flow L1 and L2 DD rockets for years without shear pins and still do. My opinion; don't use shear pins unless it is a heavy fiberglass rocket, friction fit will work for the lighter paper tube rockets just fine.
Have you ever augmented the deploy charge on your motors? I'm wondering about the feasibility of adding another few mg of bp to the stock charge to ensure pressure.
IMO you are taking the wrong approach, and making a problem that doesn't exist. simply add tape to the transition to tighten the fit, and drill a small (1/16") hole to equilibrate the internal pressure in the booster. Since you "over-built" AKA "made a lead-sled" out of the booster you should not drag separate after burnout and before motor ejection, and there shouldn't be any need to augment the motor if you haven't altered the physical volume inside the rocket.Awesome Bob. Thanks. I was wondering about pressure. I may not even try shear pins on the mean machine. It was more theory for DD than a determined course. The argent is almost absolutely going to need them. The transition is so loose it's scary. I totally overbuilt the booster. I'm taking no chances on failure for my L1 cert. I'm not too worried about failing the BT on the booster, it's stouter than I would have expected. But failing the payload seems much more possible.
Have you ever augmented the deploy charge on your motors? I'm wondering about the feasibility of adding another few mg of bp to the stock charge to ensure pressure.
I was just looking at the motor ejection vs volume. The same ideas used in calculating DD variable charges for deployments. Some rockets use .4g for deploy. Some use 1.2g. Was simply asking since it could affect shearing the pins. It's just questions to learn. Theory for now. Not practice.
You are basically building a DD rocket but want it to hold together during single deploy flights? You can use small plastic reusable rivets at the sections you want to hold together or just go ahead and tap it and use the 2-56 nylon screws that you intend to use for shear pins in DD. With no charge separating the pinned sections, they shouldn't shear. Like was mentioned earlier though reinforce the holes somehow. (I am finishing my Estes Partizon with future DD in mind and that is how it is set up. But then again I've neveri flown DD myself sooo....)
Mike
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