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- Aug 27, 2011
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Warning--- Requires at least a 100 yard radius of flat parking lot or mown grass for complete recovery!
Video Here: https://www.youtube.com/watch?v=46ppJ5O1vYQ&feature=youtu.be
Since everything has already been done before, I won't claim this is original because some ( other and older) fart will tell me this is an old Estes design or something George Gassaway published a long time ago. Anyway, I thought it was fun.
The rubber band retention I have been using for my helirocs (Whopper Flopper Chopper, Dandelion Seed, Spyder) seemed like it might work for this.
Thing looks almost exactly like my 4 rotor helirocs on launch. Down the center is a BT-5 tube attached to a paper nose pyramid (the square version of a nose cone). The body tube acts as a "piston", the nose cone wraps around the OUTSIDE of the "sides" of the rocket (the "sides" would be "rotors" if this was a chopper.) Thus the nose pyramid acts as a retainer to keep them in place on ascent. The rubber bands (2) work the same as my helicocs, holding the "sides" in place AND holding the motor. At Apogee, ejection burns the rubber bands AND (hopefully) shoves the piston forward. Thus both the anterior pyramid retention and the posterior rubber band retention are released. The Nose Pyamid and body tube are attached (one piece) and have a some short streamers to slow them down on descent. The 4 "sides" are 1/8" balsa, with the fins integrated into the side (think FlisKits TiddlyWink). They flutter down, pretty slowly. Definitely an A8-3 rocket, as even with that engine, I am guessing Apogee at around 100 feet, scattered the 5 recoverable parts (4 sides and the body tube-Pyramid piece) over about 50 yards. DEFINITELY need good eyes (course would have HELPED if I'd painted it--- but as one poster here comments---some rockets need to earn their paint) to track the 5 pieces. Motor ejects, but this design WOULD support putting a piece of streamer on the motor for those of you in Brush Fire territory.
First flight was perfect. Second flight the rubber band I THINK held a moment, you can see on the post flight one of the "sides" is nearly burned through. I had debated putting a longer mylar strip on this, but I thought the "piston" would deflect the blast better. On my helirocs, I usually extend the mylar about 2-3 inches above the rubber band holes.
Anyway, I had fun (okay, I laugh like an idjit).
Definitely would NOT recommend this for an upscale, though!
![Detonator.jpg Detonator.jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/66/66687-8fc9c25365a541d88c79179181741096.jpg)
![DetonatorPartsPostFlight.jpg DetonatorPartsPostFlight.jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/66/66688-d74fc1f34ca3439d8945836169b06d18.jpg)
Video Here: https://www.youtube.com/watch?v=46ppJ5O1vYQ&feature=youtu.be
Since everything has already been done before, I won't claim this is original because some ( other and older) fart will tell me this is an old Estes design or something George Gassaway published a long time ago. Anyway, I thought it was fun.
The rubber band retention I have been using for my helirocs (Whopper Flopper Chopper, Dandelion Seed, Spyder) seemed like it might work for this.
Thing looks almost exactly like my 4 rotor helirocs on launch. Down the center is a BT-5 tube attached to a paper nose pyramid (the square version of a nose cone). The body tube acts as a "piston", the nose cone wraps around the OUTSIDE of the "sides" of the rocket (the "sides" would be "rotors" if this was a chopper.) Thus the nose pyramid acts as a retainer to keep them in place on ascent. The rubber bands (2) work the same as my helicocs, holding the "sides" in place AND holding the motor. At Apogee, ejection burns the rubber bands AND (hopefully) shoves the piston forward. Thus both the anterior pyramid retention and the posterior rubber band retention are released. The Nose Pyamid and body tube are attached (one piece) and have a some short streamers to slow them down on descent. The 4 "sides" are 1/8" balsa, with the fins integrated into the side (think FlisKits TiddlyWink). They flutter down, pretty slowly. Definitely an A8-3 rocket, as even with that engine, I am guessing Apogee at around 100 feet, scattered the 5 recoverable parts (4 sides and the body tube-Pyramid piece) over about 50 yards. DEFINITELY need good eyes (course would have HELPED if I'd painted it--- but as one poster here comments---some rockets need to earn their paint) to track the 5 pieces. Motor ejects, but this design WOULD support putting a piece of streamer on the motor for those of you in Brush Fire territory.
First flight was perfect. Second flight the rubber band I THINK held a moment, you can see on the post flight one of the "sides" is nearly burned through. I had debated putting a longer mylar strip on this, but I thought the "piston" would deflect the blast better. On my helirocs, I usually extend the mylar about 2-3 inches above the rubber band holes.
Anyway, I had fun (okay, I laugh like an idjit).
Definitely would NOT recommend this for an upscale, though!
![Detonator.jpg Detonator.jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/66/66687-8fc9c25365a541d88c79179181741096.jpg)
![DetonatorPartsPostFlight.jpg DetonatorPartsPostFlight.jpg](https://cdn.imagearchive.com/rocketryforum/data/attachments/66/66688-d74fc1f34ca3439d8945836169b06d18.jpg)