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bottle rocket fins and venturi

by crujones43, published

bottle rocket fins and venturi by crujones43 May 2, 2010

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Description

untested. inspired by this instructables.com/id/Soda-Bottle-Rocket./ I thought it would be fun to see if more thrust could be obtained by creating a venturi nozzle. Nozzle should spin onto bottle like a cap.

Recent Comments

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Any STLs to share?
This reminds me of the plastic water rockets sold in toy stores in the summer. If you extended and narrowed the nozzle and added a rim, the rocket could be pumped up with a water rocket pump, which would produce a pretty cool toy, if it could produce enough thrust to get off the ground.
Hi,

Straight fins add drag ... fins to force rotation add more drag ...

OTOH, straight fins might add a little more stability towards going straight from the launch pad ... but the launch pad needs to be level to achieve maximum altitude.

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Instructions

follow basic instructions in link above. launcher should epoxy into 1 inch pvc or abs. launch trigger is with 1/8 wire (coathanger will work). It may need a bead of silicone in the bottom of the launcher to create a good seal.
Any STLs to share?
This reminds me of the plastic water rockets sold in toy stores in the summer. If you extended and narrowed the nozzle and added a rim, the rocket could be pumped up with a water rocket pump, which would produce a pretty cool toy, if it could produce enough thrust to get off the ground.
Hi,

Straight fins add drag ... fins to force rotation add more drag ...

OTOH, straight fins might add a little more stability towards going straight from the launch pad ... but the launch pad needs to be level to achieve maximum altitude.
If the fins were made separate (or from another material) this would probably be printable! Might not be enough resolution to make the threads work, but it's worth a shot.
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