Ping Pong Parachute B/C

[HippoLowercase]

I've been reading that 3/2 of the parachute's diameter is a good length for the shroud lines, but it feels too long... Any thoughts on the lengths or is 3/2 actually optimal?

[Hartman]

I've been reading that 3/2 of the parachute's diameter is a good length for the shroud lines, but it feels too long... Any thoughts on the lengths or is 3/2 actually optimal?

I personally use around 2/3 the diameter of my parachute, but nothing less than the radius, cuz I found that the parachute will just flutter.

[MTV<=>Operator]

Can the ping pong ball count as the nose of the rocket?

[vehicleguy]

Can the ping pong ball count as the nose of the rocket?

No I don't believe it counts, so the nose must be blunt even without the ping pong ball.

[donutsandcupcakes]

Can the ping pong ball count as the nose of the rocket?

No I don't believe it counts, so the nose must be blunt even without the ping pong ball.

If we put duct tape on the edges of the tube (in the tube design) then will it count as being blunt?

[vehicleguy]

To be considered blunt, the rocket must pass through rule 3.c. Basically a bottle cap must be placed on the nose, and as long as the inside of the cap does not touch the nose, it will pass. See the rule for the specific bottle cap dimensions.

[ET2020]

Does anyone know how to prevent larger parachutes from collapsing in on themselves? I have a 25 cm radius parachute that works perfectly, but when I tried making a 40 cm radius it had a tendency to partially collapse a few seconds after deployment, making mostly useless. Any suggestions on how to fix this?

[CookiePie1]

Does anyone know how to prevent larger parachutes from collapsing in on themselves? I have a 25 cm radius parachute that works perfectly, but when I tried making a 40 cm radius it had a tendency to partially collapse a few seconds after deployment, making mostly useless. Any suggestions on how to fix this?

first, check that there isn't any static cling on it. The static cling issue can be solved with some baby powder or cornstarch. second, the parachute might be too heavy for your ping pong ball. Maybe try a lighter material or possibly add some weight to the ball? I'm not really a fan of the middle hole thing but maybe that's also worth a try.

[xiangyu]

Does anyone know how to prevent larger parachutes from collapsing in on themselves? I have a 25 cm radius parachute that works perfectly, but when I tried making a 40 cm radius it had a tendency to partially collapse a few seconds after deployment, making mostly useless. Any suggestions on how to fix this?

first, check that there isn't any static cling on it. The static cling issue can be solved with some baby powder or cornstarch. second, the parachute might be too heavy for your ping pong ball. Maybe try a lighter material or possibly add some weight to the ball? I'm not really a fan of the middle hole thing but maybe that's also worth a try.

Haha I disagree, I'm a fan of the "middle hole thing" also known as a vent. IMO it stabilizes the parachute and makes it deploy faster.

In addition, be careful if you decided to go the (inferior) adding weight route, as recent SOINC FAQ stated that "No, a weight of any kind may not be added to the ping pong ball." However, if you choose, you may be able to get around that by just using tape to add weight.

Xiangyu

[Hartman]

Does the hole thing reduce time, though?