AndyJ
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- Joined
- Jan 20, 2009
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Hi, I'm a long time reader, but I don't post often. I have been working on this custom built rocket for approximately a year, and would say that I'm 90% finished with the build including finishing and painting. The main step remaining is that I'm undecided on a nose cone, and had a small question on over-stability. I'm considering using a Premade Loc-Precision 3.90 inch nose cone or Vaughn Brothers nose cone of the same size (the main body tube is a Loc 3.90 Airframe). Ideally though, I would prefer a perfectly conical Nose Cone at a 1:1 Length to Diameter Ratio, but I'm not sure if the expense of having a custom made one can be justified.
The other question I had was that RockSim predicts my rocket to be overstable by 3.55 Calibers, though I suspect it will be less as the true center of mass is farther back. I was wondering how adverse an effect this over stability would have in mild conditions, say 10 mph winds.
Below are pictures of the current build, though I have extended the top portion by another 6 inches using a coupler. The fins are attached by punching small holes in the body tube and fins to create a better bond, and by using an epoxy mixed with chopped carbon fipers. The shock cord is a 1 inch elastic and I will be using a 36 inch military flare parachute. It is designed with a 29mm motor mount, though I regret not using a 38 and downsizing, though that can be for another project. I would appreciate any advice any of you rocketry veterans can offer, I'm all ears.
https://www.flickr.com/photos/40706270@N02/3748457128/
https://www.flickr.com/photos/40706270@N02/3747667965/
The other question I had was that RockSim predicts my rocket to be overstable by 3.55 Calibers, though I suspect it will be less as the true center of mass is farther back. I was wondering how adverse an effect this over stability would have in mild conditions, say 10 mph winds.
Below are pictures of the current build, though I have extended the top portion by another 6 inches using a coupler. The fins are attached by punching small holes in the body tube and fins to create a better bond, and by using an epoxy mixed with chopped carbon fipers. The shock cord is a 1 inch elastic and I will be using a 36 inch military flare parachute. It is designed with a 29mm motor mount, though I regret not using a 38 and downsizing, though that can be for another project. I would appreciate any advice any of you rocketry veterans can offer, I'm all ears.
https://www.flickr.com/photos/40706270@N02/3748457128/
https://www.flickr.com/photos/40706270@N02/3747667965/
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