Hello,
I'm apart of a team building a rocket for a competition where we carry 8.8 pounds of payload to a specified altitude. Our goal is 30,000 feet. The competition is the Spaceport America Cup IREC 2017. All the rules can be found on their website. (https://www.soundingrocket.org/sa-cup-documents--forms.html )
We are currently designing a 98mm MD and planning on launching on a motor around the N3301 from Cesaroni. From talking to other people and my research, I know this isn't going to be easy. I was hoping someone with experience building something this size can help. The team is worried about aerodynamic heating, fin flutter, whether the fins would stay attach, the heat and strength required for the epoxy, and anything else that might cause an issue. I've attached a copy of our current rocksim design so anyone can look over it.
General Design
Performance (rocksim flight simulation data on N3301)
Other design parameters and simulation results can be found in the rocksim file.
Currently plan on using Adtech 820 epoxy and some high temp epoxy (not sure what kind yet could use suggestions)
If possibly, having technical documents can be useful when presenting and verifying safety margins.
If someone can help, the team and I would appreciate it.
I'm apart of a team building a rocket for a competition where we carry 8.8 pounds of payload to a specified altitude. Our goal is 30,000 feet. The competition is the Spaceport America Cup IREC 2017. All the rules can be found on their website. (https://www.soundingrocket.org/sa-cup-documents--forms.html )
We are currently designing a 98mm MD and planning on launching on a motor around the N3301 from Cesaroni. From talking to other people and my research, I know this isn't going to be easy. I was hoping someone with experience building something this size can help. The team is worried about aerodynamic heating, fin flutter, whether the fins would stay attach, the heat and strength required for the epoxy, and anything else that might cause an issue. I've attached a copy of our current rocksim design so anyone can look over it.
General Design
- 98mm MD
- Standard dual deploy using Stratologger CF as primary and secondary deployment system (We have talked about the lack of oxygen for black powder charges at 30,000 feet but unsure what to do exactly)
- Filament wound fiberglass tubes for everything including couplers
- G10 or carbon fiber fins (haven't decided)
- Main about 91 inch diameter and drogue about 24 inch diameter (planning on using spherachutes for main and drogue with Kevlar harnesses)
- Aluminum tip nose cone (plan on having an all thread run down the length of it attaching to the bulk plate with some other electronics on board like a transmitter)
- Payload is required to fit inside 5x5x5 cm cube form factor (can have multiply cubes and can be anything, we plan on using metal cubes like brass and 3D print to fin tune the amount)
- Haven't decided using a tip to tip brace on the fins using composites or something else like Max Q Aerospace fin can yet.
- We are using a MD retention device off the shelf
Performance (rocksim flight simulation data on N3301)
- Max speed: Mach 1.94
- Max Gee force: 18.04
- Velocity at deployment: 46.52 ft/sec
- Apogee: 30907.68
- Launch Static Margin: 2.55
- Velocity at launch guide departure: 134.37 (using an 18 ft rail guide also require by competition rules to leave guide at 100 ft/sec or faster
Other design parameters and simulation results can be found in the rocksim file.
Currently plan on using Adtech 820 epoxy and some high temp epoxy (not sure what kind yet could use suggestions)
If possibly, having technical documents can be useful when presenting and verifying safety margins.
If someone can help, the team and I would appreciate it.
