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For a typical water rocket, it doesn't matter much. Three squares or triangles, about four to ten square inches in size, 120 degrees apart, as far below the center of mass (balance point) as you can put them, will do well enough. Use any stiff plastic and a lot of Duct Tape. Try to glue them on as close to vertical as you can - or if you want the rocket to spin, try tilting them all the same way a couple degrees. (A small amount of spin may help stability; a lot will cut down your altitude greatly). A water rocket isn't going to be very stable at the best of times, since the water tends to slosh around, and the fins can't do much about that. (A little bubble bath in the water, shaken up to get some foam, may help.)

yah but whatever else u wnt man(:

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Q: What is the best design for bottle rocket fins?
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What can be done to help a bottle rocket fly straight?

Add guide fins to the body of the rocket.


How do you think your bottle rocket will fly?

by water being placed into the bottle and then, when you launch your rocket, the rocket will spin (if it has at least 2 fins) and the water will spurt out and make the rocket go higher in the air. (Tip:the more it spins,the higher it will fly)


What is the best fin size for a 2 liter bottle rocket?

There does not appear to be a "best" size. It depends on a number of factors, to include the bottle used (brand of drink & manufacturer), type of rocket, distance aiming for. One common element to consider is drag. Larger fins have greater surface and mass which will directly affect the altitude your rocket can reach.


How does newton's first law realte to rocket movement?

Newton's first law, which dictates that objects will maintain their current states of stillness or motion unless acted upon, affect rockets in two ways.First, it establishes the need to exert a massive force to get a rocket off the ground: not only to simply get moving but also the overcome the force of gravity being exerted on the rocket while on the ground.Second, it explains why rockets do not need so much thrust once they do get into space. According to the first law, as long as the rocket doesn't have to alter its speed or direction, it doesn't need to exert any more force. This is why space-bound vessels are calculated on such careful trajectories--to allow for their natural tendencies of motion to carry them to their destinations.


What makes a rocket fly straight?

A bullet flies almost at a straight line because: 1) it has a very high velocity 2) it spins around itself, and due to the conservation of angular momentum it is less affected by air drag.

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