#21
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Actually, yes, there is more on this project:
I mentioned I ordered a 3D printed escape tower from Shapeways. There were problems. As noted, the top of the escape rocket was missing. Also, as I compared it to my plans (David Weeks drawings), I noted that the lower diagonal and the cap were not properly positioned with the lower diagonal attaching below the cap. I cut these parts off and switched their positions using JB Weld and some Evergreen round styrene to replace the trimmed-off diagonal. It looks much better now. Other problems include a missing conduit to the escape rocket and the mounting hole being slightly too large. I received the replacement top of the escape rocket in the mail today. I've also worked with the designer to correct the problems and to reduce the price. I should receive v.2 in the mail in a few days. I will test fit it to the K-41 capsule and to a Dr. Zooch capsule and if I get really lucky, and can find it in my parts box, to the Semroc BT-60 capsule as well. All of these are balsa 1/42.7 scale for BT-60. I will post pictures when the new tower comes in. And it will absolutely be launched, maybe by Yuri's Night. Now, Dlazarus' picture shows a later Centuri/Estes Mercury capsule at 1/35 scale. I haven't worked on that one yet, but that may be a future project. Shapeways does have some significantly more accurate, larger Mercury towers and capsules available but they are pretty darn expensive. If I run across one, I'll post a link.
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NAR 79743 NARTrek Silver I miss being SAM 062 Awaiting First Launch: Too numerous to count Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774 On the Bench: 2650; Dream Stage: 1/39.37 R-7 |
#22
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You can bye a new Capsule and LES from Estes #1921 Mercury/Redstone now for BT-70
http://www.estesrockets.com/034125-...e-plastic-parts
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NAR # 91740SR C.R.A.S.H. - NAR Section #482 SAM Member #0153 "I said Lunch, not Launch!" - Far Out Space Nuts |
#23
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Actually, its NOT BT-70. Its the old Centuri/Semroc ST-20 tube.
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NAR 79743 NARTrek Silver I miss being SAM 062 Awaiting First Launch: Too numerous to count Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774 On the Bench: 2650; Dream Stage: 1/39.37 R-7 |
#24
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Once built, I 'painted' my K-41 MR tower with 30-minute epoxy thinned 50/50 with Acetone.
The thinned epoxy soaks into tne wood and really strengthens it.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#25
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And that's exactly what I'm going to do with the 3D printed tower.
Pictures this weekend.
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NAR 79743 NARTrek Silver I miss being SAM 062 Awaiting First Launch: Too numerous to count Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774 On the Bench: 2650; Dream Stage: 1/39.37 R-7 |
#26
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I built mine using carbon fiber rods. Used Medium CA to bond. Its bullet proof. Also built the SEMROC Little Joe II in same manner. | can squeeze the hell out of the tower and its solid!!
__________________
NAR # 91740SR C.R.A.S.H. - NAR Section #482 SAM Member #0153 "I said Lunch, not Launch!" - Far Out Space Nuts |
#27
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Quote:
Wow, you must have been doing something right! I built one from carbon fibre rod and used CA to bond it, but I felt that adhesion of the glue was poor. I don't trust the tower at all and have never had the nerve to launch. Joe |
#28
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I recommend using medium CA, not thin for building the tower. It will be very strong. I did not use an accelerator.
__________________
NAR # 91740SR C.R.A.S.H. - NAR Section #482 SAM Member #0153 "I said Lunch, not Launch!" - Far Out Space Nuts |
#29
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Alrighty guys,
Attached are pictures (one with flash and one without) of the 3D printed towers on both the K-41 capsule AND the Dr. Zooch capsule. They are made of PVC-like material that is surprisingly tough. Typical of 3d printing, they are rough to the touch. As I indicated above, I'm going to "paint" them with finishing resin which will both smooth them out and add strength. Recall that the K-41 capsule is to be rigged to parachute suspended horizontally. There's no way the aerospike would survive a point-down landing. Yes, I know this is going slowly. . . . I didn't get a Yuri's Day or a Big Al Cinco de Mayo launch because the weather's been so crappy. So I'm shooting for a Memorial Day launch, with K-41 to take to the skys after 41 years. I'll post more pictures in coming days. I've got some Rescue Sandhawk pictures, too.
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NAR 79743 NARTrek Silver I miss being SAM 062 Awaiting First Launch: Too numerous to count Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774 On the Bench: 2650; Dream Stage: 1/39.37 R-7 |
#30
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Looking good, Mark !
__________________
When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
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