lakeroadster
When in doubt... build hell-for-stout!
Nice paint job! What is the recovery system? The motor tube ejects & then the rest of it tumbles down?
LINK
Nice paint job! What is the recovery system? The motor tube ejects & then the rest of it tumbles down?
Thanks. I picture is worth a 1000 words.
One of lakeroadster's CAD drawings is worth about 10,000.Thanks. I picture is worth a 1000 words.
Do you want a 3D printed version of this? Would be a pretty easy design to create in Tinkercad so you can 3D print a field of them -- or should I say a Rocket Garden full of them
My mindsim says that the spheres at least will have quite a bit of base drag. I'd say the same of the wide fins, but I'm not sure how the very canted trailing edge impact that in the real world.The swing test for this rocket seemed rock solid stable, yet the Open Rocket simulation reflected a stability caliber of only 0.189.
I went back and updated the Open Rocket Simulation to have the base vortex cone discussed in the Apogee Peak of Flight Newsletter #145.
This change increased the stability caliber from 0.189 to 0.642. Additionally I think the wide fin profiles and the sphere's produce enough drag that the stability is likely higher than 1 caliber.
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Yes, that.To me it looks a lot like a shuttlecock, and we know those will fly with a rocket motor in them.
and if possible a long launch control wire. But I do expect it'd be good, thanks to it's resemblance to a shuttlecock.I would probably err on the side of caution for the first couple flights, i.e. still day, plenty of initial thrust, and if possible a longer rod...
How did you arrive at that cone size? If I remember the article correctly, the base of the cone is supposed to be the same diameter as the base of the rocket body. Your cones appears to be much bigger around than your body tube.I went back and updated the Open Rocket Simulation to have the base vortex cone discussed in the Apogee Peak of Flight Newsletter #145.
Launch Report
My wife and I launched the Red Columbine.
The rocket flew rock solid stable on an Estes D12-3 BP motor. An impressive rocket to watch due to its non rocket looking profile.
This is a rear eject spool design and there were no issues with deployment. It's my first scratch build design to utilize rear eject, as well as a nylon 18" parachute. I'm a fan.
No damage occurred upon ground impact.
I gained a lot of respect for you folks that post up flight videos and photos. We were so focused on not losing the rocket since it was its maiden flight, that I wasn't able to get any apogee or recovery photo's.
So... my apologies in advance for the poor-quality photos and video.
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I seem to get more realistic Sims leaving the base drag cone in there....but my sample size is low and I'm using an Estes altimeter, so scientific my results are not.
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