6 replies to this topic

[rocket gary]

i have been haveing problems with all the rockets that i make when i try to put a payload on what iv been trying to do is make rockets that bang at the end of the fuel what i do is i make it the same way i would with any rocket clay at top bottom and drill one end but iv drilled a small hole at the top soo that it can ignite the payload but this just does not seem to work it will maby go 20 ft max and make a poping sound then hit the ground still alight and go bang could some one help me out and tell me where im going wrong iv just been makeing shells and i thought i could get a rocket to go much higher but just is not working im sure im just over looking some thing thanks all Gary

[MDH]

Hi gary,

You're going to have to be more specific about what kind of rocket you're making, the nozzle size, and the type of rocket fuel you are using.

Edited by MDH, 14 October 2009 - 09:18 PM.

[dr thrust]

hi gary, the "hole" as you call it in the top end plug is called the "passfire" as to the cause of the pop i'd hazard a guess and say the end plugs blowing out because its been weakened, try putting the hole closer to the side of the tube, and a thicker clay plug.
one question.. end burner or core burner?, end burner's are harder to dial in to lift a payload

[Sambo]

My guess is that you are making an endburner. I would say the nozzle is getting blown out, giving the popping sound mid flight. The fuel is still burning inside the casing giving no thrust so the rocket comes back down. The fuel then burns on the ground as you stated until reaching the bulkhead (top clay plug) and igniting the flash.

You need to ram the nozzle harder and maybe increase the nozzle diameter.

[CCH Concepts]

i have by no means got my rockets working well. but what i have found is a tool on ebay. its a brass tool, that has a plate with a spindle to give a center core. it also gives a taper to the nozzle hole.

the only thing i have added is a piece of 2"x2" with a hole that will sleeve the tube so the ramming doesn't burst the tube, as i only seem to be able to get spiral rolled tubes.

rocket tool

[rocket gary]

basicly these are very small rockets bottle rockets just to test so im not wasteing loads of bp on big rockets also there core burner i drill a small hole at the top side then fill it with flash were only talking enough space for 0.3g but just woulnt work rocket jumps of the tube and bangs the plug is going but how do i stop this ? thanks for ur input all

[dr thrust]

could be the delay grain, how much of a delay do you have above the core?