Air Trajectory B/C

[windu34]

Im just stating what i believe to be the purpose. Its likely nobody at nats used the graphs the way i described

Right, I understand. This is why I said we disagree. But that is OK

I just got the new rules and there is a little less room to make adjustments between shots. And less height to drop the weight. I'm pretty sure our design from last year will not work with the rule changes. I guess that is their intent.

Yeah. Its gonna be tough with the new height restriction

[N_Selwa]

can u use a counter wieght for air trajectory in division b

[laidlawe18]

What do you mean by a counter weight?

[bernard]

can u use a counter wieght for air trajectory in division b

How are you using it? If you use a weight on your device to stabilize it and it does not contribute to the launch force, then it should be allowed. Disclaimer that this isn't the place for official clarifications.

[Sidvin]

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid

[windu34]

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid

Do you have access to a 3-D printer?

[bernard]

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid
:)

O-ring around a plastic part, which can be easily designed and 3D printed if you have access to that. If not, try 3 disks: 2 a bit larger and 1 a bit smaller in diameter. Drill a hole down the middle of all disks, sandwich in this order through a threaded rod: large, smaller, large; the o-ring goes around the smaller one. Use nuts/washers to fix the disks in place. I can make a diagram in a day if this isn't clear. And use lubrication. You might need 2 pistons on a rod (kind of like a barbell) so the piston only moves linearly...

[Argus]

Has anyone seen a successful device using a piston? I'm sure it is possible but i havent seen a really good one at a competition and if anyone did use one what kind of scores did you get?

[bernard]

Has anyone seen a successful device using a piston? I'm sure it is possible but i havent seen a really good one at a competition and if anyone did use one what kind of scores did you get?

We used a bike pump last year, which involves a piston, not made by us though. It can work quite consistently. And a bonus is that all the parts are made in factories so they are close enough to perfect.

[brayden box]

Last year we used a piece of PVC pipe, about 5 inches tall, filled it with rocks, and used air pressure, dropping it down another bigger PVC pipe. Looks like it will be a lot harder than it was last year.