Tamir Friedman
Active Member
- Joined
- May 26, 2021
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Hello,
Recently we established a new rocketry club in my University and we are currently working on a high powered rocket using the J425R Aerotech motor. As part of our design we are planning to have the rocket built of two carbon fiber tubes connected via a coupler at the middle. The top part of our rocket is going to have some sensitive electronics so we decided to have our rocket separate midway via the ejecting charge of our motor. I am currently working on designing the volume in the rocket dedicated for the recovery system and I have few questions as a first timer:
1. Would closing the volume via bulkheads glued using epoxy to the body tube would be sufficient to sustain the ejection charge and separate the rocket? Or will the whole thing will break into pieces if we attempted it? we are currently planning on using plywood bulkheads, but we also have fiberglass sheet that we can use to make the whole thing tougher.
2. Currently our design is very much "dumb design". It includes the coupler being epoxied to the top tube of the rocket and slided into the bottom tube, with no reinforcements (it will basically hold together via drag only). Are we underthinking it and the rocket will randomly separate mid flight by accident?
3. How do I calculate the amount of PSI required to separate the rocket?
Those are the dimensions of the recovery/ejection volume in the rocket:
- diameter - 10cm
- length - 28 cm
- coupler length - 20cm (10 cm into each tube)
- coupler and body tubes made of carbonfiber.
Thank you so much in advance!
Recently we established a new rocketry club in my University and we are currently working on a high powered rocket using the J425R Aerotech motor. As part of our design we are planning to have the rocket built of two carbon fiber tubes connected via a coupler at the middle. The top part of our rocket is going to have some sensitive electronics so we decided to have our rocket separate midway via the ejecting charge of our motor. I am currently working on designing the volume in the rocket dedicated for the recovery system and I have few questions as a first timer:
1. Would closing the volume via bulkheads glued using epoxy to the body tube would be sufficient to sustain the ejection charge and separate the rocket? Or will the whole thing will break into pieces if we attempted it? we are currently planning on using plywood bulkheads, but we also have fiberglass sheet that we can use to make the whole thing tougher.
2. Currently our design is very much "dumb design". It includes the coupler being epoxied to the top tube of the rocket and slided into the bottom tube, with no reinforcements (it will basically hold together via drag only). Are we underthinking it and the rocket will randomly separate mid flight by accident?
3. How do I calculate the amount of PSI required to separate the rocket?
Those are the dimensions of the recovery/ejection volume in the rocket:
- diameter - 10cm
- length - 28 cm
- coupler length - 20cm (10 cm into each tube)
- coupler and body tubes made of carbonfiber.
Thank you so much in advance!