Bottle Rocket B

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bernard
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Bottle Rocket B

Postby bernard » Fri Jun 17, 2016 5:00 am

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Re: Bottle Rocket B

Postby freed2003 » Fri Sep 09, 2016 2:14 pm

Does anyone think that a bottle glider would be optimal since the bottle is smaller?
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Re: Bottle Rocket B

Postby SPP SciO » Fri Sep 09, 2016 10:18 pm

I don't know about "optimal" but certainly worth experimentation!

I'm looking for suggestions on quality launchers - my priority criteria are ease of use (with a bike pump rather than compressor), durability next, and finally cost. We've been using a contraption with the zip tie collar and pvc tubing but it's super annoying to get the fit right.

I remember seeing a link to a site that supplied the launchers used at nationals, but a quick googling couldn't find it. While I'm asking questions, anyone have a table comparing psi, wind speed, and open area for launching practice? We are an urban school and have lost a few rockets to various rooftops in the past!
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Re: Bottle Rocket B

Postby freed2003 » Sat Sep 10, 2016 2:53 am

The site might have been this: https://wardsci.com/store/product/14458 ... launch-pad s
since they're the official kit supplier or something
Are there any parks you can use?
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Re: Bottle Rocket B

Postby SPP SciO » Mon Sep 12, 2016 3:43 pm

freed2003 wrote:The site might have been this: https://wardsci.com/store/product/14458 ... launch-pad s
since they're the official kit supplier or something
Are there any parks you can use?


Wow - I'm surprised I didn't see that - I saw a handful of other launchers on Ward but I missed that one. I'm thinking that must be the same as the standard one on this page: http://www.nerdsinc.com/products/ That was the site I had seen a while back.

As for parks, there are a couple in the neighborhood, but with trees and typically lots of people - plus it's a lot trickier in general to go off campus to practice. We've got a field attached to our school that's the most convenient spot, but it's only about 50m x 50m (http://goo.gl/Ycf51Z). We'll see. Hopefully they'll build these rockets before there's snow everywhere and being outdoors is unpleasant.

Edit - answered my question - https://spaceflightsystems.grc.nasa.gov ... safety.htm This offers good guidelines for practice location space
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Re: Bottle Rocket B

Postby daycd » Mon Sep 12, 2016 8:58 pm

SPP SciO wrote:I'm looking for suggestions on quality launchers - my priority criteria are ease of use (with a bike pump rather than compressor), durability next, and finally cost.


Not mentioned yet is the aquaport II launcher. We have used the predecessor and it is very easy to use and reliable.

http://www.pitsco.com/Aquaport_II_Water_Rocket_Launcher

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Re: Bottle Rocket B

Postby abartonkc » Thu Sep 22, 2016 2:37 pm

Does anyone know if the Bottle Rocket event this year will have the "egg" component?

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Re: Bottle Rocket B

Postby Jaol » Thu Sep 22, 2016 3:20 pm

I believe it does.
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Re: Bottle Rocket B

Postby Castle_Dynamo » Sun Sep 25, 2016 11:15 pm

Jaol wrote:I believe it does.

AAAAAARRRRRGH

That means I have to attack the egg with bubble wrap again!

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Re: Bottle Rocket B

Postby Zioly » Fri Sep 30, 2016 12:46 am

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?
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Re: Bottle Rocket B

Postby bernard » Fri Sep 30, 2016 4:32 am

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?

I'm guessing the carbonated beverage rule is there because bottles for carbonated beverages are designed to withstand the higher pressures of carbonated beverages. Think of the very thin water bottles you see now; they're not as thick as carbonated beverage bottles because they don't need to be. If you fill a weak bottle with lots of air, the chance for explosions is greater.
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Re: Bottle Rocket B

Postby SPP SciO » Sat Oct 01, 2016 9:42 pm

Zioly wrote:
And finally, a question: would ES(s) enforce the rule of only using carbonated beverage bottles as pressure chambers?


100% - as said above, it's a safety concern. Labels are required, and it's pretty easy to tell by looking at it - carbonated beverage bottles have that indented pattern on the bottom, which pops out if it's under unsafe pressure - sort of like a pre-explosion warning.
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Re: Bottle Rocket B

Postby abartonkc » Tue Oct 04, 2016 7:31 pm

Since we have never done this event previously, I have a couple of questions with regards to the egg.

Does the egg need to be placed into an easily accessible compartment or can it be placed in a location that will then be sealed up by tape during the launch?

What can you bring with you to prepare the rocket with the egg and prior to launch? Are there any restrictions? Is the egg only placed in the rocket during the 10 minute window prior to launch or can it be loaded prior to that?

Thanks.

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Re: Bottle Rocket B

Postby Zioly » Wed Oct 05, 2016 9:15 pm

abartonkc wrote:Since we have never done this event previously, I have a couple of questions with regards to the egg.

Does the egg need to be placed into an easily accessible compartment or can it be placed in a location that will then be sealed up by tape during the launch?

What can you bring with you to prepare the rocket with the egg and prior to launch? Are there any restrictions? Is the egg only placed in the rocket during the 10 minute window prior to launch or can it be loaded prior to that?

Thanks.


Run down of how the competition and the egg will work:

1. You've built your rocket. It can hold an egg in ANY possible way, as long as tape/glue does not adhere to said egg. Therefore, it can be in a compartment. In fact, that is the only logical way that I see it.

2. Once arriving at the launch site for competition, you must select 2 eggs that the judges will provide for you. Once the eggs are selected, you must place the egg(s) in their separate rockets.

3. You have 10 minutes to prep your rockets for launch. (Although the judges don't really care about it, from past experience.)

Hope this helps. If not, please respond with more questions.
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Re: Bottle Rocket B

Postby Unome » Wed Oct 05, 2016 9:47 pm

Zioly wrote:(Although the judges don't really care about it, from past experience.)

I would caution that this is strongly dependent on the particular event supervisor; though they are in theory all supposed to stick to the rules, sometimes they do not.
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