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Launch pad for 29mm MD rocket

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rockets

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OK. Today I bought 10 ft. stick of 3/4 inch PVC. I have heard that people make MD pads with PVC.
If my rocket is 20 inches long & 29mm diameter, how long should the 3 different pipes be???
Thanks,
 

blackbrandt

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Run a sim on openrocket and see how long your guidance system has to be.
 

cavecentral

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Not sure what minimum size would be. Are you using a launch lug, rail buttons, or neither (tower)?

Many altitude seekers build a tower to not use a lug / button so they have less drag. They are usually 2 aluminum L's that sandwich each fin - 6 total for 3 fins. I seen them maybe 3-4' long? All the L's attached to a solid point so the fins slide between them. Looks like a really long fin alignment guide.
 

retortec

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blackbrandt has the right idea. More g's at launch the shorter the launch support. Cutting your pvc to the proper length and fixing the ends to a base in a pattern to support the body tube will give you a basic tower. 3/4" is a bit big and a little flexy without a hailo on top. Try a fourme search for "tower" and you will get plenty of ideas.
 

TRFfan

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I have an idea for a cheap and good launch tower. PM me and Ill tell you the details.
 

TRFfan

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It's an idea i got from a friend. Take a retangular wood block and put 4 metal rods in it so that they are aligned properly. Then put a metal plate on the bottom to be like a blast deflector.
 

retortec

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I have been trying to fined pictures of my first plywood tower but no joy. I recently moved so things are scattered and hard to fined. But I did fined my 1967 edition of the Handbook of Model Rocketry that originated the design. Three plywood uprights with finely finished edges facing the airframe. Mine had c-clamps holding the uprights in place. The clamps made fine adjustment and takedown easy. Low tech but this design works great. I used one for years.

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