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Re: Bottle Rocket B
Posted: May 9th, 2011, 7:57 pm
by Cheesy Pie
Rockets either fall apart, land out of reach, or land in reach and intact. No inbetweens.
Re: Bottle Rocket B
Posted: May 10th, 2011, 1:17 pm
by Jimean716
fishman100 wrote:squash wrote:What amount of water is the best?
I seems that nearly 30% or 60% works well.
Thanks
I would think 60% would be too much; we were told at a competition that 50% "looked like an awful lot of water." But then we won
Jocool wrote:I had about 45%.
Same here
Our secret is putting in 22.5%. I know it sounds insane, but we did some testing on our rockets. In one scenario, the rocket started leaking slightly, and launched with only about 20% water left.
We got a new best time. We even shot it past the fence and into the 2 acre woods behind our school. We found it about 700 ft. away and the tip had been completely crushed, probably on impact.
Re: Bottle Rocket B
Posted: May 10th, 2011, 2:02 pm
by Tramsarran
Using 22.5% water, how long did you manage to keep it in the air?
Re: Bottle Rocket B
Posted: May 10th, 2011, 2:17 pm
by chlorine kills
Has anyone found the perfect balance of strength and lightness? I made a glider that worked perfectly, but it didn't get high enough... so it ended up not doing well.
Re: Bottle Rocket B
Posted: May 10th, 2011, 4:21 pm
by Cheesy Pie
Jimean716 wrote:fishman100 wrote:squash wrote:What amount of water is the best?
I seems that nearly 30% or 60% works well.
Thanks
I would think 60% would be too much; we were told at a competition that 50% "looked like an awful lot of water." But then we won
Jocool wrote:I had about 45%.
Same here
Our secret is putting in 22.5%. I know it sounds insane, but we did some testing on our rockets. In one scenario, the rocket started leaking slightly, and launched with only about 20% water left.
We got a new best time. We even shot it past the fence and into the 2 acre woods behind our school. We found it about 700 ft. away and the tip had been completely crushed, probably on impact.
What was your time? And time doesn't matter if it was ruined.
Re: Bottle Rocket B
Posted: May 10th, 2011, 5:53 pm
by Tramsarran
Not if you have the resources and knowledge to build someting very similar to or better than the ruined one.
Re: Bottle Rocket B
Posted: May 10th, 2011, 6:43 pm
by Cheesy Pie
Yeah. These are my good rocket points, in order of importance
Stays Intact and Follows Construction Rules
Time/Design
Height
Re: Bottle Rocket B
Posted: May 12th, 2011, 1:58 pm
by drifter601
what kind of launcher will they have at Nationals?????????????????????????????????
(ANY DIVISION C COMPETITORS MIGHT KNOW SINCE EGG-O-NAUT FROM LAST YEAR SHOULD USE THE SAME LAUNCHER.
Re: Bottle Rocket B
Posted: May 12th, 2011, 2:05 pm
by drifter601
space scientist wrote:Cheesy Pie wrote:What did the 30-second rockets look like? Don't worry; I'm not going to Nats.
The most effective design this year has been the backslider which will always (if it is a working backslider) be a fairly long (or super long) bottle rocket that is as lightweight as possible with the center of balance put halfway in between the center of pressure and center of lateral area. However, there may be some adjustments to adapt the rocket to certain weather conditions.
Edit: Never mind. I misread the question.
How do you find the center of pressure, and the "lateral area" means the lateral area of
just the cone, right????????
Re: Bottle Rocket B
Posted: May 12th, 2011, 2:06 pm
by drifter601
Oh no!!! 
,
the chance of precipitation in Nationals (saturday) is ........
60%!!!!!!!!!!! AAAAAHHHHH!!!!!!!
wind: from E at 10mph
Humidity: 58%
UV Index: 5 Moderate
Sunrise: 5:29 CT
High: 68 F
according to weather.com
