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Water Rockets

by capella_ben Apr 10, 2014
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Will it fit a standard 2 liter bottle found in the states?

Not as-is. If the bottle has the straight neck (like the one in my picture) you could scale the model to fit. If you do, be sure to NOT make the top too thick as it will then be too heavy. You do need some weight on the nose but not too much.

Thank you for the reply, I will make this in a few day's in black pla!

I'm building a bottle rocket for physics and I really like this idea, but we are using 2 liter bottles instead of the 1.25 liters. I can't seem to figure out how to angle the fins, how would I do that?

It is designed to simply use a bottle with a straight edge at the neck. If you can find a 2 liter bottle with a straight neck, then you can upscale it a little as use it as-is.

It is pretty hard to design it for a curved neck as there are a few different bottle shapes out there.

We used these with my middle school students and modified a bit mostly for size. Thanks!

Are these designs for United States style of soda bottles?
I tried to use these and I am new at this - just checking, I teach Physics and it appears that the sizes ore incorrect.
Any suggestions to correct this would be utterly appreciated.


The first thing I would try is to simply scale the model.

How far is it out? Is the model too big or small?

If you don't have much luck I can make some modifications, but you will have to give me accurate dimensions.


Will try, I have resized to 122% or ~ 108 mm. I resized the “cone”, "Base" and “air speed flap from the Water Rocket Parachute Deployment System. I will let you know how it goes.
Thank you,
Pittsburgh PA, USA

You might try to shrink the bottle itself in hot water. Could be useful for small adjustments. Good luck.