Funkworks
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- Jul 28, 2018
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In the 80's, I had a comic where some guy escaped from some desert animal. Here's an article about it. And here's how the mythical escape was portrayed.
Well done.RockSim model isn't a perfect representation, but with the added fins around the ring fin (modeled as a cylinder in RockSim) I should have "good" margin for stability. The swingtest is a must I think. I will try it both with just the conical ring fin and with added external fins.
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And now for a couple pictures of the (hopefully) final design.
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And now for a couple pictures of the (hopefully) final design.
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Some cotton balls for display purposes?View attachment 454349
okay, this probably says more about me, but here goes,
the complete rocket is really cool, but can you please paint the tube some other color or put on some crazy decal or paint scheme that sort of hides that long cylindrical thing that comes out between his legs? It just looks kind of, well, wrong.
I see this as a prototype and at this stage, anything goes!... It just looks kind of, well, wrong.
Also: heads pops up so this one is not a human.... including the idea of making it big enough to actually put two motors in the jetpack, but to start I have settled with a Mandalorian wearing a jetpack figure with the rocket tube up through the legs and body ....
Did you try shortening the tube to the point that he is standing on the fin can, and then adding ballast at his head?RockSim model isn't a perfect representation, but with the added fins around the ring fin (modeled as a cylinder in RockSim) I should have "good" margin for stability. The swingtest is a must I think. I will try it both with just the conical ring fin and with added external fins.
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Painted the tube gray, and I do plan to add a "THIS IS THE WAY" decal.View attachment 454349
okay, this probably says more about me, but here goes,
the complete rocket is really cool, but can you please paint the tube some other color or put on some crazy decal or paint scheme that sort of hides that long cylindrical thing that comes out between his legs? It just looks kind of, well, wrong.
Completed a swing test tonight with the longer tube and it was stable. Total weight with a D12 is at 200g. I would have had to add significantly more "helmet weight" if I wanted to shorten the tube.Did you try shortening the tube to the point that he is standing on the fin can, and then adding ballast at his head?
Kick the tires and light the fires..Painted the tube gray, and I do plan to add a "THIS IS THE WAY" decal.
Completed a swing test tonight with the longer tube and it was stable. Total weight with a D12 is at 200g. I would have had to add significantly more "helmet weight" if I wanted to shorten the tube.
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One thing to be mindful of is the drag of the conical ring makes the rocket more stable than the simulation indicates.Painted the tube gray, and I do plan to add a "THIS IS THE WAY" decal.
Completed a swing test tonight with the longer tube and it was stable. Total weight with a D12 is at 200g. I would have had to add significantly more "helmet weight" if I wanted to shorten the tube.
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Congrat's are in order. Scratch builds rock! Awesome recovery crew, too!Maiden flight today. Flew slow and low on a C5-3. Good second flight too, but chute took too long to open and suffered some tube bending above the ring fin. But I'll take this as a win. He can be repaired, next flight will be on a D12.
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Wonder how much Disney would charge for marketing rights?You should sell this idea to Estes.
Given that I had to cut out a section of body tube just above the existing conical ring, I took you up on your suggestion @BABAR. I have increased the outside diameter to 9 inches, which required me to print the ring in 5 parts (my printer has a max build footprint of 5.5in x 5.5in) Rocksim model shows some margin for stability, and I will swing test with the ring temporarily in place to confirm stability. Mass of the new ring is 60g, while the old one was about 40g, so it did go up some.Very cool.
what’s the mass of the ring assembly itself?
I was wondering if the next rendition might work with a larger ring (like the diameter of the current edge of the outer fins), ditch the outside fins, use 3 or 4 internal dual purpose fins/spokes, and ditch the angle on the ring and the outer fins. I think such a construct would provide greater stability (good), possible less drag by ditching the angle on the ring (also good), but not sure of effect on mass of the fin can unit compared to current.
First, still looks great.Given that I had to cut out a section of body tube just above the existing conical ring, I took you up on your suggestion @BABAR. I have increased the outside diameter to 9 inches, which required me to print the ring in 5 parts (my printer has a max build footprint of 5.5in x 5.5in) Rocksim model shows some margin for stability, and I will swing test with the ring temporarily in place to confirm stability. Mass of the new ring is 60g, while the old one was about 40g, so it did go up some.
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