Search found 21 matches

by ImNotSmart
March 7th, 2015, 5:51 am
Forum: 2015 Study Events
Topic: Astronomy C
Replies: 147
Views: 27732

Re: Astronomy C

Hey everyone! I have a few questions about the practice test this year. First of all, is there any particular way to determine a star's spectral type from its temperature, or do I just have to approximate it with an H-R diagram? If it's the latter, could someone link me to an H-R diagram good enough...
by ImNotSmart
March 7th, 2015, 4:16 am
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

Hello! I'm currently using a stomp rocket as the base for my design. The tube connected to the stomp rocket is a fraction of an inch in diameter. I've tested the design with the actual rocket, and it can fire the correct distance. However, I have been unsuccessful in connecting the tube to the PVC ...
by ImNotSmart
March 6th, 2015, 8:42 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

Hello! I'm currently using a stomp rocket as the base for my design. The tube connected to the stomp rocket is a fraction of an inch in diameter. I've tested the design with the actual rocket, and it can fire the correct distance. However, I have been unsuccessful in connecting the tube to the PVC p...
by ImNotSmart
March 1st, 2015, 4:25 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

Would that allow the weight to slam into the piston with more force to launch the ball further? Yes it would!. At fist I had both combined and had a very similar problem to the one you have. But now I am able to reach the required distance. Are you using a device similar to mine? How did you keep t...
by ImNotSmart
March 1st, 2015, 4:02 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

Ok so I'm trying a piston design. It's pretty simple - I have a 4 inch PVC pipe which connects to a thin plastic tube which connects to the barrel where the ball is launched from. My piston is a 3 inch PVC pipe with 2 caps on the ends which are just the right size so when I put my piston PVC in the...
by ImNotSmart
March 1st, 2015, 3:42 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

Ok so I'm trying a piston design. It's pretty simple - I have a 4 inch PVC pipe which connects to a thin plastic tube which connects to the barrel where the ball is launched from. My piston is a 3 inch PVC pipe with 2 caps on the ends which are just the right size so when I put my piston PVC in the ...
by ImNotSmart
March 1st, 2015, 3:04 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

If you don't put your ball into your PVC barrel and put your hand over the end of the barrel, do you feel air coming out? A little bit but definitely not enough to launch the ball. I'd like to see a video because I'm not sure what is wrong from your descriptions. I think unfortunately I'm going to ...
by ImNotSmart
March 1st, 2015, 6:52 am
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

My bike pump is releasing air - I'm just pretty sure that its not enough. Just to give you an idea, if I take out the adapter and connect the hose directly to the barrel, the ping pong ball does not budge when I pump down the handle. I have been putting the hose head over the barb but it hasn't see...
by ImNotSmart
February 28th, 2015, 5:53 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

The threaded end (left side) of the brass hose barb is screwed into the PVC end cap (which I've drilled a hole into). The bike pump head fits onto the barb end of the brass hose barb and is tightened. The ball is inserted into the PVC so the outermost tip of the ping-pong ball is flush with the PVC...
by ImNotSmart
February 28th, 2015, 5:07 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 108995

Re: Air Trajectory B/C

The threaded end (left side) of the brass hose barb is screwed into the PVC end cap (which I've drilled a hole into). The bike pump head fits onto the barb end of the brass hose barb and is tightened. The ball is inserted into the PVC so the outermost tip of the ping-pong ball is flush with the PVC...

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