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  #21  
Old 06-01-2019, 05:31 PM
erik442's Avatar
erik442 erik442 is offline
The Alpha Kid
 
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Decals installed!
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  #22  
Old 06-22-2019, 10:07 PM
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erik442 erik442 is offline
The Alpha Kid
 
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Launch lugs finished and attached. Just received some G77 motors in the mailbox. Recovery system nearly complete.
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  #23  
Old 06-22-2019, 10:15 PM
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Earl Earl is offline
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You've put a lot of time and effort into this model, but it looks like it has come together very well.

Here's looking towards a very successful flight report decorated with spectacular launch photos!


Earl
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  #24  
Old 09-28-2019, 01:32 PM
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erik442 erik442 is offline
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Thanks for the compliment, Earl.
Too bad things didn't originally go as planned, but I now have the Soyuz all fixed up better than new. The crash was beneficial in identifying structural weak spots. (See Mission Control: August 11 Launch report) All the broken pieces have been reassembled and I've done a lot of internal reinforcing. I made bracing from .039 piano wire and attached it at the bottom to limit twisting of the boosters. It worked very well. The whole assembly is much more rigid.
Everything got a fresh coat of paint and I have upgraded the recovery system to 400lb. Kevlar.
All cord connections will now utilize split rings. It seems that the crash was due to the Kevlar cutting itself. I had tied small bowline knots on all the cord ends and the connected loops cut through each other when subjected to the forces of deployment. The 30" parachute that I wanted to use won't fit, so I may try two 18" and hope they don't get tangled up.
The weather here is exceptional and I want to try to fly it again soon.
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  #25  
Old 09-28-2019, 01:37 PM
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ghrocketman ghrocketman is offline
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The Aerotech H128 is under FAA propellant weight limits requring a HPR waiver.
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When in doubt, WHACK the GAS and DITCH the brake !!!

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ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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  #26  
Old 09-29-2019, 09:22 PM
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erik442 erik442 is offline
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I don't have an L1 certification or a big enough flying field, so I'll have to stick with the G motors.
Except for the delay being too long, I thought that G80 worked fine. It just had too much velocity when the chute deployed, which no doubt contributed to the Kevlar failure. I think your suggestion of a 4 second delay was spot on. I just couldn't get one to ignite. I didn't know until now that some propellants are easier to light than others.
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