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Re: Bottle Rocket B
Posted: January 25th, 2017, 12:26 pm
by sciolyohio
Zioly wrote: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.
Bottle Rocket B
Posted: February 1st, 2017, 7:04 pm
by 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
Re: Bottle Rocket B
Posted: February 1st, 2017, 7:54 pm
by y1008083
Wright state first was like 18 seconds on 50psi
Re: Bottle Rocket B
Posted: February 3rd, 2017, 6:46 am
by Sasstiel
This is my first year; anyone have any suggestions on how much water to put in the bottle? (like fraction/percentage wise) Thanks!!
Re: Bottle Rocket B
Posted: February 3rd, 2017, 4:44 pm
by Fanglin
Sasstiel wrote: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!
Re: Bottle Rocket B
Posted: February 5th, 2017, 5:12 pm
by daycd
y1008083 wrote: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.
Re: Bottle Rocket B
Posted: February 5th, 2017, 7:25 pm
by Zioly
y1008083 wrote: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.
Re: Bottle Rocket B
Posted: February 6th, 2017, 2:27 pm
by y1008083
Combined,i have the scores but their on a excel.
Re: Bottle Rocket B
Posted: February 6th, 2017, 2:28 pm
by y1008083
Oh it was windy and snowing.
Re: Bottle Rocket B
Posted: February 6th, 2017, 6:06 pm
by 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!