/diy/ - Do It Yourself

hey guys, It's OP

the idea is now a full-flegded project involving more people.

I am going to use a polystyrene box with some cheap ass camera with an sd card, a gps tracker, and probably a raspberry pi with termometer and barometer. Still wondering about backup gps. I estimate payload in the 500-1000 g range.

Balloon I'll order from the UK (1200 g, that's 35-36km burst height) and helium from a party store. For prediction of path there's a cool website that does it in real time. The parachute I made it today from plastic bags, ~ 1 m aperture, tested with some weigths and it works just fine. I'll have to modify though because I used tape and I doubt that's a legal move at -50? + humidity, think I'll just sew it.

Total price: under 300? assuming I can get the camera for free somewhere (I think I can.) 200? if I drop the onboard computer.

(for those who are wondering: this would be 70? less if I lived in the UK and didn't have to order the balloon.)

Is it true that knots in ropes are weakened by water? How and how do I prevent it?