- Joined
- Apr 20, 2020
- Messages
- 393
- Reaction score
- 261
Hopefully the title says it all, I'm wanting to build a lateral spin recovered rocket in the style of a mosquito. Assuming I can get some quirks worked out this will turn into a build thread.
In the attached .ork files I have added a tube coupler, overridden to have the mass of empty engine casings after ejection. The stability is very near 0. The fins have square tabs that will likely be 90 degrees to the rest of the fin (in OR they are just part of the fin but straight boost shouldn't care, right?)
For boost the engine is held in with a size up motor hook (13mm use an 18mm hook, 18 uses a 24), at ejection the motor is kicked rearward and "hangs out" past the fins. The 13 mm model doesn't have a engine hook mass because I don't have one on hand to weigh
If anyone has done sideways spin I'm open to pro's and con's of this design. My biggest question though is regarding where the spin surfaces lie. Is 90 degrees from the rest of the fin the best location? Does the spinning part not being lined up over the recovery CG cause it to tumble instead of spin or is it irrelevant as long as the stability is at 0?
I noticed some threads using tube fins to accomplish spin but I have no idea how to sim the tube to get it to work. Unless I just extend the fin tabs to match the circumference?
In the attached .ork files I have added a tube coupler, overridden to have the mass of empty engine casings after ejection. The stability is very near 0. The fins have square tabs that will likely be 90 degrees to the rest of the fin (in OR they are just part of the fin but straight boost shouldn't care, right?)
For boost the engine is held in with a size up motor hook (13mm use an 18mm hook, 18 uses a 24), at ejection the motor is kicked rearward and "hangs out" past the fins. The 13 mm model doesn't have a engine hook mass because I don't have one on hand to weigh
If anyone has done sideways spin I'm open to pro's and con's of this design. My biggest question though is regarding where the spin surfaces lie. Is 90 degrees from the rest of the fin the best location? Does the spinning part not being lined up over the recovery CG cause it to tumble instead of spin or is it irrelevant as long as the stability is at 0?
I noticed some threads using tube fins to accomplish spin but I have no idea how to sim the tube to get it to work. Unless I just extend the fin tabs to match the circumference?