Rocket Nozzle

[Dave_C]

I thought some of you might have some interest in this rocket nozzle that I made for my brother in Iowa.

It fits a 3" X 24" motor that uses KNO3 and sugar as a propellant. Uses about 5# of fuel, goes to about 10,000 feet.

The Nozzle is made of 12L14 steel. The blank was about 4.375" X 2.875". I drew the drawings in VISIO to the specs I was given by the rocketeer and I actually hit them! (Surprise, )

It took me 7 hours to make this one. Actually about 2 hours worth of lathe work and 5 hours of scratching my head to figure out how to go about it.

It is a typical 60/30 inclusive angle C/D nozzle with a .620 throat and a 10:1 expansion ratio. Exit cone is 1.960" I think.

Sure was fun making it!

Dave C.

[Andypullen]

Looks like the nozzles we made for the hybrid rocket engine this past year....

The first one was made of steel and it burned out after 2 seconds.....It was burning polyethylene.

Nice work...

Andy Pullen

[Harold_V]

Very pretty work!

Harold

[gmann109]

Nice work. Reminds me of my past experiences working with engines in Aerospace.

Most liquid rockets have vernier engines with small thrust chambers like this one. They control the rotation of the missle. Some were liquid propellent like on the Atlas, Jupiter and Thor and others used piped exhaust gases like the Titan missile.

The verniers were on the sides of the main body of the missile and were moveable (gimballed). They were usually arond 1,000 pounds of thrust or less.

[BobWarfield]

Looks like the nozzles we made for the hybrid rocket engine this past year....

The first one was made of steel and it burned out after 2 seconds.....It was burning polyethylene.

Nice work...

Andy Pullen

Andy, did you use some other alloy to keep it from burning up?

Best,

BW

[Dave_C]

Here is a pic of the nozzle in progress. You can see the insert made to hold the right end of the nozzle while I turned the OD. It is cut to the same 30 degree taper as the nozzle so it fits very well. I had to put oil on it so it would come out after I got the OD done. Holds very well though.

Dave C.