Bottle Rocket B

[sciolyohio]

Any projected Nationals-winning times yet? I'm thinking around the same as last year, but I'm not sure.

The overall weight of rockets would be lighter, due to the usage of 1 liter bottles rather than 2, but the air compressed would also be less than a 2 liter, when both are pumped to a constant PSI.

And finally, a question: would ES(s) enforce the rule of only using carbonated beverage bottles as pressure chambers? For example, I've seen 1 liter SmartWater bottles being used before, but those aren't carbonated, are they? I say this because it really limits the shapes available to competitors, whether we're using a carbonated bottle or not, and it could put those who thought exclusively of carbonated bottles at a disadvantage, if non-carbonated bottles are loosely allowed. What are your thoughts on pressure chamber shapes/bottle brands?

This is just my thoughts but I think 18-20 for each launch would win.

[alenaluhoover]

For Division B in bottle rocket it says that "pressure vessels must be made out of a single 1-liter or less plastic carbonated beverage bottle" so for the nose, am I allowed to use a part of another bottle? Or does that violate the construction parameters?
Thanks

[y1008083]

Wright state first was like 18 seconds on 50psi

[Sasstiel]

This is my first year; anyone have any suggestions on how much water to put in the bottle? (like fraction/percentage wise) Thanks!!

[Fanglin]

This is my first year; anyone have any suggestions on how much water to put in the bottle? (like fraction/percentage wise) Thanks!!

Welcome to Bottle Rockets!!

The common standard I have noticed, is 1/3 of the bottle, (I mainly used between 400 to 600ml of water) <-- this was for 2 liter bottles though
but, I have noticed that it doesn't really matter how much water to air you have, just as long as it isn't the extremes. Usually there is a balance between propulsion and weight which events itself out. I'de say the Highest and Lowest I would do is 50% and 15%.

You should experiment this yourself, and see what works best for your rocket. I, after all, have never made a 1 liter bottle rocket before so there could be a big difference...

Anyway, I hope this helps!

[daycd]

Wright state first was like 18 seconds on 50psi

Was this an official time? A windy day? That is an incredible time. I'm guessing that 12 seconds is where a lot of the good teams will end up. With the exceptional teams being nearer 14 seconds.

[Zioly]

Wright state first was like 18 seconds on 50psi

Individual or combined?

EDIT: Just saw your other post, y. By total, you mean combined, I assume.

[y1008083]

Combined,i have the scores but their on a excel.

[y1008083]

Oh it was windy and snowing.

[kendreaditya]

From what I noticed from lunching bottle rocket, you have to have a windy day rocket and a non-windy day rocket. This is because when I use the mylar tube on a windy day the rocket can't gain height. However, when I use the T8 tubes I can get a lot higher. But if I use the T8 tubes on a non-windy day then the times are not as great as the mylar cones.

Does anyone have any suggestions for my rocket!