Times and sec/ft

[xiangyu]

Launcher inconsistencies is the biggest problem with this event. With one launcher, I use 10 psi and my rocket goes around 20 ft or so. At one of the invitationals I went too, I launched at 30 psi my first run and it went around 5 ft or so. I think next year there should be one or two launchers that competitions are required to use. There is just way too much variation depending on the launcher.

Yes, I had this happen. Did you bring your own pump? I know some have suggested bringing your own pump but I don't know if a different pump will "fix" the launcher...

[builderguy135]

on a side note, i asked the proctor the celing height and he actually told me 30 feet. I'm not sure where this measurement came from though.

Count the cinderblocks on the wall, they're 8 inches each. Gym is just under 21feet tall.

Also, the reason we got 4 seconds was because we had to modify the parachute to get it into spec and we got unlucky with the air pressure (first launch was wayy too low, second launch slammed the ceiling). Side note, some people with maroon hoodies were cheering when it failed both times lol, not sure why. Pretty sure it was a middle school too smh.

That's not okay for a team to do. When you say "unlucky" was that an error on the launcher side of things (where it didn't work correctly) or on the PSI you all wanted? I think we are going to see more and more issues with lack of consistency between launchers at different competitions. I know there is no good way to overcome this but was just curious. Are you all competing at MIT?

The first launch was realllly low, so about 8 feet (35 psi). The second launch was 50 psi, and it smacked the ceiling, but it probably would've gotten around 30 feet (20 foot ceiling lol). I've been getting the same problem with launchers too, especially between the launcher I use to practice and the launchers I've seen at competitions.

Also yeah, I'm going to MIT.

on a side note, i asked the proctor the celing height and he actually told me 30 feet. I'm not sure where this measurement came from though.

Side note, some people with maroon hoodies were cheering when it failed both times lol, not sure why. Pretty sure it was a middle school too smh.

i think i was sitting on the bleachers next to those guys...
competitor school or not, people need to learn about good sportsmanship... that was absolutely un-called for.

truly shameful behavior to cheer at another's misfortune.

i would disqualify them on the spot.

agreed. sad part is, this isn't even the first time this has happened and the supervisors don't really care. it happens at every regs and states i've been to as well but i guess you just get used to it ¯\_(ツ)_/¯

[lavarball]

idk if it’s just me or will 1ft/sec possibly not even be top 10 nats

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.

This didn’t age well

[builderguy135]

idk if it’s just me or will 1ft/sec possibly not even be top 10 nats

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.

This didn’t age well

lmao this was only a month ago. aren't people getting just under double that already?

[lavarball]

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.

This didn’t age well

lmao this was only a month ago. aren't people getting just under double that already?

[sciolyperson1]

This didn’t age well

lmao this was only a month ago. aren't people getting just under double that already?

[xiangyu]

lmao this was only a month ago. aren't people getting just under double that already?

Waiiiittt, people are getting 2.5 s/ft? And I thought I am doing good... xD

[will0416]

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.

This didn’t age well

lmao this was only a month ago. aren't people getting just under double that already?

what

[Hartman]

[quote=lavarball post_id=406866 time=<a href="tel:1579560562">1579560562</a> user_id=34271]
[quote=sciolyperson1 post_id=404990 time=<a href="tel:1577051381">1577051381</a> user_id=37001]
[quote=lavarball post_id=404989 time=<a href="tel:1577049656">1577049656</a> user_id=34271]
idk if it’s just me or will 1ft/sec possibly not even be top 10 nats

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.
[/quote]
This didn’t age well
[/quote]

lmao this was only a month ago. aren't people getting just under double that already?
[/quote]

...wtf

[Airco2020]

Most likely will, depends on the height of the gym they use for nats though. I'd estimate around 1.3 or 1.4sec/ft for first place.
A lot of the launching is highly dependent on the launcher itself, in practice we'd get upwards of 1.2sec/ft, but at competition not nearly as much due to the difference in psi throughout different launchers.

This didn’t age well

lmao this was only a month ago. aren't people getting just under double that already?

I'm gonna call BS on this. If you want over 2 sec/ ft the calculations say you need a domed chute with a 1.5m diameter that weighs 4 grams including the ball which is 2.8 g. Good Luck!