morlock
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- Jun 18, 2014
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I'm in the final stages of design for my scratch payload two-stage rocket. I'm trying to apply the "Measure twice, cut once" maxim so I'm asking for your input and suggestions about the design. Below is snapshot of the Open Rocket design file. You can find the file here.
Here are two snapshots of the components and design station (ahem, kitchen table).
Here are some questions about the design for which I would appreciate your input:
1) Does the global design look sound?
2) Do the stability values (in BT caliber) seem OK?
3) For the payload area, I plan to use kevlar chord with loops to close the forward bulkhead (see figure below). The goal is to have a minimal weight system. The kevlar cables with loops are used with an S-biner to keep the top of the bay from opening. The nose cone is also attached to the S-biner so, in case it pops out, everything is still attached. Do you see any potential problem with this approach?
4) Is it standard to friction fit motors in two-stage rockets? Are there other approaches using motor hooks? For example, I have motor hooks for which the hook part is very thin (less than a millimetre). Could I put it between the two motors without problem?
5) I saw recommendations to use cellophane tape (not masking tape) to tape the two motors together. Is Scotch Tape a sort of cellophane tape?
6) How would you use motors with a length of 70 mm in the motor tubes made for 95 mm? I was thinking of using some sort of removable motor block to fill the exceeding 25 mm.
Thanks for your input, I hope to start the build real soon!
Here are two snapshots of the components and design station (ahem, kitchen table).
Here are some questions about the design for which I would appreciate your input:
1) Does the global design look sound?
2) Do the stability values (in BT caliber) seem OK?
3) For the payload area, I plan to use kevlar chord with loops to close the forward bulkhead (see figure below). The goal is to have a minimal weight system. The kevlar cables with loops are used with an S-biner to keep the top of the bay from opening. The nose cone is also attached to the S-biner so, in case it pops out, everything is still attached. Do you see any potential problem with this approach?
4) Is it standard to friction fit motors in two-stage rockets? Are there other approaches using motor hooks? For example, I have motor hooks for which the hook part is very thin (less than a millimetre). Could I put it between the two motors without problem?
5) I saw recommendations to use cellophane tape (not masking tape) to tape the two motors together. Is Scotch Tape a sort of cellophane tape?
6) How would you use motors with a length of 70 mm in the motor tubes made for 95 mm? I was thinking of using some sort of removable motor block to fill the exceeding 25 mm.
Thanks for your input, I hope to start the build real soon!
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