Ping Pong Parachute B/C

[xiangyu]

Thank you Xiangyu.
For the fins, what did you use? My engineering room at school has wood but I am not sure what is the best material.
Sorry for asking so many questions on this forum.

Don't apologize for asking questions! It's what get discussions going and helps everyone improve. We have been using fins cut out of foam boards. However, I'm not sure if that's the best materials since the foam boards are kind of thick. I think my team might try to 3d print some very thin fins. Otherwise, thin balsa fins would probably work well too. (Make sure it's not too thin as some strength is needed)

My coach got our launcher from amazon: https://www.amazon.com/EZ-Launch-Bottle ... 168&sr=1-7

This launcher works quite well imo. (You just hook a bicycle pump to it and you'll be ready to go)

I'm sure you could probably find videos to build your own for cheaper if your team's got the time. (It shouldn't be that complicated).

Xiangyu

[mynameisbob]

What's a good size for the parachute? I don't want it to be too big and have trouble opening, but I don't want it to be too small either and fall faster. is it mainly just trial and error or is there a size that just works well?
As for the material, I was planning on using vinyl tablecloth. It that too heavy?
Thanks,
Bob

[klastyioer]

What's a good size for the parachute? I don't want it to be too big and have trouble opening, but I don't want it to be too small either and fall faster. is it mainly just trial and error or is there a size that just works well?
As for the material, I was planning on using vinyl tablecloth. It that too heavy?
Thanks,
Bob

try something light yet durable
not too thick either
mostly trial and error, start small and work your way up, vise versa

[megrimlockawesom]

What's a good size for the parachute? I don't want it to be too big and have trouble opening, but I don't want it to be too small either and fall faster. is it mainly just trial and error or is there a size that just works well?
As for the material, I was planning on using vinyl tablecloth. It that too heavy?
Thanks,
Bob

Trial and error is the best way of determining your parachute size.

I've tried vinyl tablecloth, and in my experience it seems too heavy for a parachute.

[eagerlearner102]

Thank you Xiangyu.
For the fins, what did you use? My engineering room at school has wood but I am not sure what is the best material.
Sorry for asking so many questions on this forum.

Don't apologize for asking questions! It's what get discussions going and helps everyone improve. We have been using fins cut out of foam boards. However, I'm not sure if that's the best materials since the foam boards are kind of thick. I think my team might try to 3d print some very thin fins. Otherwise, thin balsa fins would probably work well too. (Make sure it's not too thin as some strength is needed)

My coach got our launcher from amazon: https://www.amazon.com/EZ-Launch-Bottle ... 168&sr=1-7

This launcher works quite well imo. (You just hook a bicycle pump to it and you'll be ready to go)

I'm sure you could probably find videos to build your own for cheaper if your team's got the time. (It shouldn't be that complicated).

Xiangyu

Thanks. By the way, did that launcher fit well with the 1 liter bottle?

[xiangyu]

Thanks. By the way, did that launcher fit well with the 1 liter bottle?

Yes, it fits very well, as long as the neck flange is smaller than 1.6 cm (As complied with the rules)

[bearasauras]

National just posted a rules clarification which limits the maximum pressure to 65 psi.

[DatSciolyBoi]

National just posted a rules clarification which limits the maximum pressure to 65 psi.

Nani

[eagerlearner102]

Are any of you using backsliders? Would that still follow the rules regarding the nosecone?

[JasperKota]

Can the same launcher used for Division B bottle rockets be used for this event as well?