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Bit of a cross post from the 3d printing section, but anyways.
This came out of some parts that I had sitting around from some prototyping and had just stuck a nose cone on a body, and then was like... oh that is cool looking, will it fly? And then, that's cool but really just nose ejection? Why not rear ejection just for something different?
The Stinger! is a 70mm stubby with rear ejection! Designed to run on E30-7 and F44-8 at about 550' and 900' respectively. Its 13.6oz loaded without motor. As its a stubby, it did have to have a bit of nose weight added to it around 3 oz.
For deployment, will be using a JLCR with 200' deployment altitude with a 24" main flat parachute and no drogue.
Did I mention the entire thing is 3d printed outside of the 24mm tube used as a motor liner?
The engine mount slides out of the rear of the rocket upon ejection. Can do it friction fit or with shear pins. First flight I think I'll send it up with just friction fit. Not pictured is a kevlar shock chord that ties to a shock chord mount molded into the nose cone and a shock chord mount molded into the rear ejection pod - normally just use 4-5x length of the rocket.
Motor installation is pretty simple, just unscrew the engine retainer and slide motor in, then screw on retainer. Then just do normal packing for parachute and slide it into the body with the shock chord, and then the pod slides in and ready to launch.
First flight should be at NIRA on the 20th, so we'll see how it actually performs! Hoping for a good flight up, and its big enough and low enough that should be able to see the entire flight and the rear ejection!
This came out of some parts that I had sitting around from some prototyping and had just stuck a nose cone on a body, and then was like... oh that is cool looking, will it fly? And then, that's cool but really just nose ejection? Why not rear ejection just for something different?
The Stinger! is a 70mm stubby with rear ejection! Designed to run on E30-7 and F44-8 at about 550' and 900' respectively. Its 13.6oz loaded without motor. As its a stubby, it did have to have a bit of nose weight added to it around 3 oz.
For deployment, will be using a JLCR with 200' deployment altitude with a 24" main flat parachute and no drogue.
Did I mention the entire thing is 3d printed outside of the 24mm tube used as a motor liner?
The engine mount slides out of the rear of the rocket upon ejection. Can do it friction fit or with shear pins. First flight I think I'll send it up with just friction fit. Not pictured is a kevlar shock chord that ties to a shock chord mount molded into the nose cone and a shock chord mount molded into the rear ejection pod - normally just use 4-5x length of the rocket.
Motor installation is pretty simple, just unscrew the engine retainer and slide motor in, then screw on retainer. Then just do normal packing for parachute and slide it into the body with the shock chord, and then the pod slides in and ready to launch.
First flight should be at NIRA on the 20th, so we'll see how it actually performs! Hoping for a good flight up, and its big enough and low enough that should be able to see the entire flight and the rear ejection!
