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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

FIN GUIDES

Members post instructions to construct water rockets, launchers, deployment systems, staging mechanisms, splicing bottles, and payloads.
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bugwubber
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FIN GUIDES

Post by bugwubber » Thu Nov 20, 2014 10:05 pm

Best method I've seen yet for marking fin lines on your rocket body.

http://www.masa-rocketry.org/tech/Fin%2 ... 0Guide.pdf

This template generator makes it easy to print your rocket body and fin cross section. Use spray contact cement to apply the paper to foam board and then cut out the cross section to make a nice fin holder.

http://www.payloadbay.com/index.php?pag ... =FINGUIDES


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Re: FIN GUIDES

Post by Water Rocket Expert » Fri Nov 21, 2014 11:27 am

Thanks for these!


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Re: FIN GUIDES

Post by bugwubber » Fri Nov 21, 2014 2:21 pm

Water Rocket Expert wrote:Thanks for these!

Make sure when you print the pdf from payloadbay that fit to page isn't selected. My printer tried to scale it since the orig page is 11×17


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Re: FIN GUIDES

Post by Water Rocket Expert » Fri Nov 21, 2014 4:27 pm

bugwubber wrote:
Water Rocket Expert wrote:Thanks for these!

Make sure when you print the pdf from payloadbay that fit to page isn't selected. My printer tried to scale it since the orig page is 11×17
Thanks for letting me know, I just did that!


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Re: FIN GUIDES

Post by U.S. Water Rockets » Sat Nov 22, 2014 12:36 pm

bugwubber wrote:Best method I've seen yet for marking fin lines on your rocket body.

http://www.masa-rocketry.org/tech/Fin%2 ... 0Guide.pdf

This template generator makes it easy to print your rocket body and fin cross section. Use spray contact cement to apply the paper to foam board and then cut out the cross section to make a nice fin holder.

http://www.payloadbay.com/index.php?pag ... =FINGUIDES

Doesn't everyone do it like that?



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bugwubber
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Re: FIN GUIDES

Post by bugwubber » Sun Nov 23, 2014 3:59 pm

U.S. Water Rockets wrote:
bugwubber wrote:Best method I've seen yet for marking fin lines on your rocket body.

http://www.masa-rocketry.org/tech/Fin%2 ... 0Guide.pdf

This template generator makes it easy to print your rocket body and fin cross section. Use spray contact cement to apply the paper to foam board and then cut out the cross section to make a nice fin holder.

http://www.payloadbay.com/index.php?pag ... =FINGUIDES

Doesn't everyone do it like that?
Haven't seen that particular method referenced on utube. In the past, I just folded the paper in thirds or quarters. That usually had a little bit of error in it.


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Re: FIN GUIDES

Post by U.S. Water Rockets » Mon Nov 24, 2014 9:33 pm

bugwubber wrote:
U.S. Water Rockets wrote:
bugwubber wrote:Best method I've seen yet for marking fin lines on your rocket body.

http://www.masa-rocketry.org/tech/Fin%2 ... 0Guide.pdf

This template generator makes it easy to print your rocket body and fin cross section. Use spray contact cement to apply the paper to foam board and then cut out the cross section to make a nice fin holder.

http://www.payloadbay.com/index.php?pag ... =FINGUIDES

Doesn't everyone do it like that?
Haven't seen that particular method referenced on utube. In the past, I just folded the paper in thirds or quarters. That usually had a little bit of error in it.

We created our box fin design to eliminate the guesswork. The trick with paper seems really obvious, but it does little to get the fins perpendicular to the body tube. That's why we designed the box fin method.



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Re: FIN GUIDES

Post by bugwubber » Mon Nov 24, 2014 10:53 pm

U.S. Water Rockets wrote: We created our box fin design to eliminate the guesswork. The trick with paper seems really obvious, but it does little to get the fins perpendicular to the body tube. That's why we designed the box fin method.
Definitely, the box fins worked really well for us this summer. My daughter decided to dispense with the calculations and found if she folded a piece of extra long fin material into a V shape and then placed it over a bottle laying on the table, she could cut the V at the point where the ends touched the table, and then just cut the 3rd fin to the same length.


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Re: FIN GUIDES

Post by U.S. Water Rockets » Sun Nov 30, 2014 10:55 pm

bugwubber wrote:
U.S. Water Rockets wrote: We created our box fin design to eliminate the guesswork. The trick with paper seems really obvious, but it does little to get the fins perpendicular to the body tube. That's why we designed the box fin method.
Definitely, the box fins worked really well for us this summer. My daughter decided to dispense with the calculations and found if she folded a piece of extra long fin material into a V shape and then placed it over a bottle laying on the table, she could cut the V at the point where the ends touched the table, and then just cut the 3rd fin to the same length.
That sort of thing definitely works, but we found over the years that some people actually hated it if we suggested "eyeballing" a measurement in our tutorials, because they were afraid of getting it wrong. So we try to give detailed measurements where possible. Everyone is happy then, and people who are comfortable with making up their own dimensions will do so anyhow.



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