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Re: Ping Pong Parachute B/C
Posted: February 19th, 2020, 10:33 pm
by CookiePie1
builderguy135 wrote: ↑February 19th, 2020, 10:29 pm
CookiePie1 wrote: ↑February 19th, 2020, 10:17 pm
builderguy135 wrote: ↑February 19th, 2020, 10:11 pm
Both, but the parachute is usually worse.
ah, I see. Also side note, but why are you awake at 1:17 AM lmao
Lmao. I'm studying for a test tmmr and obviously procrastinating. Wbu?
lol im grinding an english project rn
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 6:46 am
by TheChiScientist
CookiePie1 wrote: ↑February 19th, 2020, 10:33 pm
builderguy135 wrote: ↑February 19th, 2020, 10:29 pm
CookiePie1 wrote: ↑February 19th, 2020, 10:17 pm
ah, I see. Also side note, but why are you awake at 1:17 AM lmao
Lmao. I'm studying for a test tmmr and obviously procrastinating. Wbu?
lol im grinding an english project rn
Yet you are here talking on the PPP forums while working lol...
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 7:15 am
by lavarball
TheChiScientist wrote: ↑February 20th, 2020, 6:46 am
CookiePie1 wrote: ↑February 19th, 2020, 10:33 pm
builderguy135 wrote: ↑February 19th, 2020, 10:29 pm
Lmao. I'm studying for a test tmmr and obviously procrastinating. Wbu?
lol im grinding an english project rn
Yet you are here talking on the PPP forums while working lol...
Im making a parachute in English rn
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:18 pm
by donutsandcupcakes
builderguy135 wrote: ↑February 19th, 2020, 9:47 pm
donutsandcupcakes wrote: ↑February 19th, 2020, 7:16 pm
Thank you for everyone's advice, draping the parachute on the tube and having ping pong ball on the side turned out to work the best for us when we tested today, so thanks everyone
Just wondering, does it lean to one side during launch?
It does lean but our parachute is deploying so not that worried about that prob rt now. Also, I have a question, how can I make sure that my rocket doesnt touch the ceiling? When we use 55 psi in our gym it works "ok" without touching the ceiling (our gym height is 20 something ft.) so if I use the same pressure in our competition are there chances it will touch the ceiling? If so is there something I can do to avoid that? other than taking our own pressure pump(but how does that change it?)
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:24 pm
by astronomybuff
What material do you guys recommend for the fins, and what type of tape do you use to tape them (masking, duct)?
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:34 pm
by knightmoves
donutsandcupcakes wrote: ↑February 20th, 2020, 12:18 pm
Also, I have a question, how can I make sure that my rocket doesnt touch the ceiling? When we use 55 psi in our gym it works "ok" without touching the ceiling (our gym height is 20 something ft.) so if I use the same pressure in our competition are there chances it will touch the ceiling? If so is there something I can do to avoid that? other than taking our own pressure pump(but how does that change it?)
You need to know how high your rocket goes as a function of pressure, so you can adjust the pressure for whatever the competition area height is. You also have some uncertainty at the competition - the pressure gauge on the competition pump might not be calibrated the same as yours, and there might be a difference in the release mechanisms. So you might want to make your first attempt a little conservative (say target 3 feet below the ceiling or something) and then adjust your second attempt based on how high the first one actually goes.
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:38 pm
by donutsandcupcakes
knightmoves wrote: ↑February 20th, 2020, 12:34 pm
donutsandcupcakes wrote: ↑February 20th, 2020, 12:18 pm
Also, I have a question, how can I make sure that my rocket doesnt touch the ceiling? When we use 55 psi in our gym it works "ok" without touching the ceiling (our gym height is 20 something ft.) so if I use the same pressure in our competition are there chances it will touch the ceiling? If so is there something I can do to avoid that? other than taking our own pressure pump(but how does that change it?)
You need to know how high your rocket goes as a function of pressure, so you can adjust the pressure for whatever the competition area height is. You also have some uncertainty at the competition - the pressure gauge on the competition pump might not be calibrated the same as yours, and there might be a difference in the release mechanisms. So you might want to make your first attempt a little conservative (say target 3 feet below the ceiling or something) and then adjust your second attempt based on how high the first one actually goes.
Makes sense, thanks, does anyone know what type of launcher they are using at regionals? Or is it different for each competition?
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:43 pm
by knightmoves
donutsandcupcakes wrote: ↑February 20th, 2020, 12:38 pm
Makes sense, thanks, does anyone know what type of launcher they are using at regionals? Or is it different for each competition?
It'll be whatever the assigned event supervisor brings. But knowing "what kind" won't help you, as the differences will be down to that particular launcher, rather than the type of launcher. Just practice lots with your rocket, and you'll be in good shape.
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:47 pm
by donutsandcupcakes
knightmoves wrote: ↑February 20th, 2020, 12:43 pm
donutsandcupcakes wrote: ↑February 20th, 2020, 12:38 pm
Makes sense, thanks, does anyone know what type of launcher they are using at regionals? Or is it different for each competition?
It'll be whatever the assigned event supervisor brings. But knowing "what kind" won't help you, as the differences will be down to that particular launcher, rather than the type of launcher. Just practice lots with your rocket, and you'll be in good shape.
Ok thanks and ANOTHER question, sorry
, but what psi works best for you, since my rocket is kinda heavy I feel that 55 is always a minimum for me
Re: Ping Pong Parachute B/C
Posted: February 20th, 2020, 12:54 pm
by Airco2020
donutsandcupcakes wrote: ↑February 20th, 2020, 12:47 pm
knightmoves wrote: ↑February 20th, 2020, 12:43 pm
donutsandcupcakes wrote: ↑February 20th, 2020, 12:38 pm
Makes sense, thanks, does anyone know what type of launcher they are using at regionals? Or is it different for each competition?
It'll be whatever the assigned event supervisor brings. But knowing "what kind" won't help you, as the differences will be down to that particular launcher, rather than the type of launcher. Just practice lots with your rocket, and you'll be in good shape.
Ok thanks and ANOTHER question, sorry
, but what psi works best for you, since my rocket is kinda heavy I feel that 55 is always a minimum for me
You need to test and log your PSI/Height so you know when you get to competition. I'd work on reducing weight. You can only go to 65psi, so if you have a venue with a 30+ ft ceiling you won't be able to reach it which puts you at a big disadvantage.