Bottle Rocket B

UnknownyMous
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Re: Bottle Rocket B

Postby UnknownyMous » February 18th, 2012, 7:59 pm

Oh. Okay.

I have one more question, do we have to bring our bottle rockets in a box or something to the competition?
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Re: Bottle Rocket B

Postby quizbowl » February 18th, 2012, 8:01 pm

UnknownyMous wrote:Oh. Okay.

I have one more question, do we have to bring our bottle rockets in a box or something to the competition?

Erm, you don't have to, but then again, why wouldn't you want to protect your bottle rocket from possible breakage?
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Re: Bottle Rocket B

Postby rishj09 » February 21st, 2012, 3:43 pm

T_Paine wrote:
TAZmaniandevil wrote:Hi! I am doing bottle rockets for the first time this year, and i was looking and saw that lots of people attached a long cone to the front of their rocket. I was wondering if anyone could please tell me what to make that cone out of. :D


It was really differed from rocket to rocket for us. One of our rockets with wrapping paper did well. The other went like a foot and nose-dived down.

My coach said that cones will break after one flight..... so we use small water bottles all the way up to the top.
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Re: Bottle Rocket B

Postby fishman100 » February 21st, 2012, 3:50 pm

rishj09 wrote:My coach said that cones will break after one flight..... so we use small water bottles all the way up to the top.

I've seen a few rockets with water bottle/cup nose cones (there's one in the Image gallery, IIRC) and those tended to have a lower time than those built with another material, such as the wrapping paper.

The nose cone will break depending on a variety of factors; CG and CP (which ultimately affect the flight of the rocket), wind, landing, etc. If your rocket is made of a fragile material then it's more susceptible to breaking than a sturdier material, but a heavier material for the nose cone will shift the CG. Also if the rocket nosedives then yes the cone will most likely break (our rule was if the nose cone was still intact upon a nosedive, then it's too strong).

How are you connecting the water bottles? Tape? Are you experiencing stability problems with your nose cone?
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Re: Bottle Rocket B

Postby UnknownyMous » February 21st, 2012, 5:19 pm

I'm so nervous... The competition for me in TX is only THREE days away.
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Re: Bottle Rocket B

Postby fishman100 » February 21st, 2012, 6:03 pm

UnknownyMous wrote:I'm so nervous... The competition for me in TX is only THREE days away.

You have a competition on a Friday? And good luck!
Last edited by fishman100 on February 22nd, 2012, 6:21 pm, edited 1 time in total.
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Re: Bottle Rocket B

Postby jma » February 21st, 2012, 7:00 pm

Our rockets both got under 4 seconds on the competition last Saturday :cry: . Their noses were bent on the way up and caused the rockets to go down because our cones weren't strong enough. It was very sad for us. We spent a lot of time practicing. I think the homemade launcher we used at home was not sealed as tightly as the one at the tournament( I heard a pop sound and the rocket went up very fast). We got 16-17 seconds during our practices at home (except we did have a few bad flights that we thought were caused by wind).

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Re: Bottle Rocket B

Postby UnknownyMous » February 21st, 2012, 7:23 pm

jma wrote:Our rockets both got under 4 seconds on the competition last Saturday :cry: . Their noses were bent on the way up and caused the rockets to go down because our cones weren't strong enough. It was very sad for us. We spent a lot of time practicing. I think the homemade launcher we used at home was not sealed as tightly as the one at the tournament( I heard a pop sound and the rocket went up very fast). We got 16-17 seconds during our practices at home (except we did have a few bad flights that we thought were caused by wind).


Aww, I'm sorry :cry:. Well, at least you tried your best.
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Re: Bottle Rocket B

Postby jma » February 22nd, 2012, 6:23 pm

UnknownyMous wrote:
jma wrote:Our rockets both got under 4 seconds on the competition last Saturday :cry: . Their noses were bent on the way up and caused the rockets to go down because our cones weren't strong enough. It was very sad for us. We spent a lot of time practicing. I think the homemade launcher we used at home was not sealed as tightly as the one at the tournament( I heard a pop sound and the rocket went up very fast). We got 16-17 seconds during our practices at home (except we did have a few bad flights that we thought were caused by wind).


Aww, I'm sorry :cry:. Well, at least you tried your best.

Thanks, UnknownyMous. We'll try to do better at the State tournament.

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Re: Bottle Rocket B

Postby UnknownyMous » February 23rd, 2012, 11:34 am

Do you think that we should put a weight in the rocket to like control the stability or something?
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Re: Bottle Rocket B

Postby rishj09 » February 23rd, 2012, 3:59 pm

fishman100 wrote:
rishj09 wrote:My coach said that cones will break after one flight..... so we use small water bottles all the way up to the top.

I've seen a few rockets with water bottle/cup nose cones (there's one in the Image gallery, IIRC) and those tended to have a lower time than those built with another material, such as the wrapping paper.

The nose cone will break depending on a variety of factors; CG and CP (which ultimately affect the flight of the rocket), wind, landing, etc. If your rocket is made of a fragile material then it's more susceptible to breaking than a sturdier material, but a heavier material for the nose cone will shift the CG. Also if the rocket nosedives then yes the cone will most likely break (our rule was if the nose cone was still intact upon a nosedive, then it's too strong).

How are you connecting the water bottles? Tape? Are you experiencing stability problems with your nose cone?



We use tape.... and our rockets get about 15 sec per flight
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Re: Bottle Rocket B

Postby mtheleman » February 24th, 2012, 11:28 am

jma wrote:I think the homemade launcher we used at home was not sealed as tightly as the one at the tournament( I heard a pop sound and the rocket went up very fast).


As long as your homemade launcher will get up to 60psi and hold it for a few seconds, you should be okay. Our launcher usually makes a popping sound. The key is to launch in many different weather conditions while keeping the other launch variables (PSI) the same.
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Re: Bottle Rocket B

Postby jma » February 25th, 2012, 6:49 pm

mtheleman wrote:
jma wrote:I think the homemade launcher we used at home was not sealed as tightly as the one at the tournament( I heard a pop sound and the rocket went up very fast).


As long as your homemade launcher will get up to 60psi and hold it for a few seconds, you should be okay. Our launcher usually makes a popping sound. The key is to launch in many different weather conditions while keeping the other launch variables (PSI) the same.

My launcher actually gave us very good results but my concern is that it is not reliable. While we got very good results at home, we got a very bad score at the tournament. We are trying to figure out what was wrong so we won't get the same problem at the state tournament. I am listing all the possible problems that I can think of here and I really appreciate any opinions or ideas.
1. Bottle nozzle was small ( I used Safeway 1 litter soda). I think when the nozzle is fixed too tightly ( the popping sound was from the launcher at the tournament), it will take more power to push the rocket off the launcher therefore there is not much energy left to push the rocket higher. It only went up for less than 2 sec., then it went down.
2. The nosecone was not strong enough. 1 of our nosecones was made from 1 layer of thin mylar film and another one was a long plastic tube from home depot ( we cut part, between the 2 ends, of the tube out and covered the tube with laminate plastic to make the nose lighter). I saw that the tube bent on it way up.
Both of my rockets have 3 fins, they are made by manila folder and plastic sign. I used programs on the computer to calculate CLA and CP and both of the rockets have CG in between CLA & CP ( not in the middle though).

We are unsure what the problem is. I wish we could afford the commercial launcher. Does anyone have an extra one that you want to sell?

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Re: Bottle Rocket B

Postby fishman100 » February 26th, 2012, 6:26 am

My launcher actually gave us very good results but my concern is that it is not reliable. While we got very good results at home, we got a very bad score at the tournament. We are trying to figure out what was wrong so we won't get the same problem at the state tournament. I am listing all the possible problems that I can think of here and I really appreciate any opinions or ideas.
1. Bottle nozzle was small ( I used Safeway 1 litter soda). I think when the nozzle is fixed too tightly ( the popping sound was from the launcher at the tournament), it will take more power to push the rocket off the launcher therefore there is not much energy left to push the rocket higher. It only went up for less than 2 sec., then it went down.
2. The nosecone was not strong enough. 1 of our nosecones was made from 1 layer of thin mylar film and another one was a long plastic tube from home depot ( we cut part, between the 2 ends, of the tube out and covered the tube with laminate plastic to make the nose lighter). I saw that the tube bent on it way up.
Both of my rockets have 3 fins, they are made by manila folder and plastic sign. I used programs on the computer to calculate CLA and CP and both of the rockets have CG in between CLA & CP ( not in the middle though).

We are unsure what the problem is. I wish we could afford the commercial launcher. Does anyone have an extra one that you want to sell?

1 layer of mylar and the plastic tube/laminate doesn't sound sturdy enough, especially if you saw the nose cone bend as it made its way up. Try using multiple layers of the mylar/plastic tube, etc. It shouldn't add too much weight but it will make the cone sturdier.

Did they use the Aquaport launcher at the tournament? If so, then try to use a bottle with the same size nozzle as a standard 2-liter bottle, because they fit perfectly onto the Aquaport (and if you're correct about the nozzle being too small, then that will solve your problem).
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Re: Bottle Rocket B

Postby jma » February 26th, 2012, 7:39 pm

Fishman100,
We don't know what type of launcher they used at Regionals, but I know it's not the Aquaport Launcher. Thank you very much for your help.


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