Fluburtur
Cardboard Boy
About 6 months ago I had the idea to make a rocket propelled rc plane (and rocket too) so I started building some candy rocket motors. I dont really like how commercial rocket engines burn, very hard for half a second so I wanted one that could burn for a longer time but providing lower thrust, more like a real rocket.
Of all my testing not a single one worked correctly. Either that had like no thrust, blew the nozzle off or started spitting out excess potassium nitrate. I stopped doing those while I was working because I had no time but built one again yesterday, here is the result.
As you can see the burn is rather unstable, it looks like it is increasing in presure gradually until a presure burst appears then it cycles again. During the burst it actually produces a ton of thrust so I want to have it in that state all the time. My nozzle in that test was 8mm and the core around 10, I will try later today with a 5mm nozzle and 10mm core hopefully.
I wanted to keep this little project secret until I had a working rocket plane but I didnt think it would take that long so I will gladly accept any help.
Of all my testing not a single one worked correctly. Either that had like no thrust, blew the nozzle off or started spitting out excess potassium nitrate. I stopped doing those while I was working because I had no time but built one again yesterday, here is the result.
As you can see the burn is rather unstable, it looks like it is increasing in presure gradually until a presure burst appears then it cycles again. During the burst it actually produces a ton of thrust so I want to have it in that state all the time. My nozzle in that test was 8mm and the core around 10, I will try later today with a 5mm nozzle and 10mm core hopefully.
I wanted to keep this little project secret until I had a working rocket plane but I didnt think it would take that long so I will gladly accept any help.