how can i make a rocket engine that goes 50+ feet?

Question

i'm on a limited buget so i can't do anything too extravagant

Answer 1

For something that modest, I like the compressed air and water toy rocket. You can buy these (one has a max. of 150') or try to make one.

I've seen a little write-up on how to make one from a disposable water bottle or soda bottle. The hard part is the compressed air attachment and launcher. You might try to search high school education sites for a more complete description.

Answer 2

To your right you can see a picture of my small rocket collection. All of these, withMy rocket collection. exception of the largest one, are powered by ESTES class "A" through "C" rocket engines: Those are the pressed sulphur-rich black powder type, 75% KNO3, 10%S, 15%C with an Isp (specific impulse) of 80seconds. The smaller engines produce thrust between 2.5 and10Newtons for 0.5 to 2seconds+. The largest rocket uses "D" engines capable of up to 20Newtons thrust for 2 seconds. They can fly up to several hundred meters high, and can reach velocities of several hundred kilometers per hour. The ultimate challenge for me in rocketry is to break the sound barrier. Even with a reasonably small rocket this will require a very high power motor utilizing a high performance propellant (not black power of course). My research with high performance propellants has yielded some very good results, but due to lack of space I have never been able to make a full scale rocket with one such motor.

Answer 3

diet coke + mentos