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  #11  
Old 07-08-2017, 12:55 PM
Bituminous Bituminous is offline
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Hi Everybody - Thanks for all of the input. I did a static test of a D12-0. Not so bad, but not super. Video below

https://youtu.be/Llk70IAVhSY
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  #12  
Old 07-08-2017, 01:31 PM
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Quote:
Originally Posted by tbzep
Bob Kaplow used zero delay in SuperRoc before it was quickly outlawed. .
On what basis was it outlawed?
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  #13  
Old 07-08-2017, 01:35 PM
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Quote:
Originally Posted by Bituminous
Hi Everybody - Thanks for all of the input. I did a static test of a D12-0. Not so bad, but not super. Video below

https://youtu.be/Llk70IAVhSY
Teach those kids to countdown to ZERO!
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U.S. Rockets instaship. http://bit.ly/1aca7mA Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.
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  #14  
Old 07-08-2017, 02:16 PM
Bituminous Bituminous is offline
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Thanks Jerry. Will do.
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  #15  
Old 07-08-2017, 03:31 PM
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Quote:
Originally Posted by Jerry Irvine
On what basis was it outlawed?

Based on a ruling that the motor was not used as the manufacturer intended.



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  #16  
Old 07-08-2017, 03:33 PM
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Quote:
Originally Posted by Bituminous
Hi Everybody - Thanks for all of the input. I did a static test of a D12-0. Not so bad, but not super. Video below

https://youtu.be/Llk70IAVhSY

You obviously don't care whether the Saturn gets banged up!
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  #17  
Old 07-08-2017, 06:04 PM
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That makes a lot of sense. I've long since lost track of the number of things I've learned here.
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  #18  
Old 07-08-2017, 06:27 PM
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Quote:
Originally Posted by Bituminous
tbzep - I confess I did glue the $%{+ out of it. I used those molding oldies aftermarket nose and farings that added weight but strength. lesson indeed learned.

I'd use an E engine in a heartbeat but when I look at the launches (see videos themselves if you like) I'd be concerned it'd still be unstable. I did my best on the Cp-Cg thing

Think I might have to simply retire it on the shelf...if this D12-0 scheme does not work

Thanks

More glue is not better, contrary to popular belief... It adds weight not strength.

Lesson learned, hopefully...

Later! OL J R
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  #19  
Old 07-08-2017, 06:34 PM
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Quote:
Originally Posted by SEL
The one thing no one has mentioned here is do NOT use a D12-0! There is no ejection charge in -0 motors - they are meant to be used in the lower stage of multi-staged rockets only.

True, but -0 motors blow through the thinking propellant disk at near full combustion chamber pressure, which CAN potentially eject something, theoretically.... It's strong enough that countermeasures of some sort are usually necessary to slow stage separation, like taping motors together or vent ports to exhaust the gases from the blow-through...

The problem is most rockets are traveling their fastest at burnout which will strip the chute in a normal rocket...

Still not the ideal solution to his problem IMHO but theoretically it COULD work...

Later! OL J R
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  #20  
Old 07-08-2017, 06:36 PM
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Quote:
Originally Posted by luke strawwalker
True, but -0 motors blow through the thinking propellant disk at near full combustion chamber pressure, which CAN potentially eject something, theoretically.... It's strong enough that countermeasures of some sort are usually necessary to slow stage separation, like taping motors together or vent ports to exhaust the gases from the blow-through...

You're a little late there, buddy.



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