Zero Delay Engines for Booster Deployment?

[MetMan]

Can anyone give me an idea of the effectiveness of using B6-0 or C6-0 engines to deploy parallel stages? Essentially I want these engines to pop a nose cone off of a parallel stage to allow it to separate from the sustainer after/during motor burnout.

I've seen references to this technique but would like some hard facts and experiences if there are any out there. Thanks!

MetMan

 

[Micromeister]

0 delay booster motors expell enough gas forward at burn through to pop just about any cone. I've used the technique on several models. In several cluster models I forgot to vent the booster tubes.. using booster motors friction fit, and externally taped I have yet to keep the motors in the tubes after burnout... the report is even louder the tighter I tried to tape them in If you are ejecting nosecones up to BT-60 size you should have no trouble at all.

 

[MetMan]

Thanks Micromister--this pretty much confirms what I'd heard before.

MetMan

 

[thinker]

Will a D12 pop the nose con off a bt-80 tube w/o any problems?

 

[Justin Horne]

Using a booster? I don't know enough to answer. I do know i've used one with a charge to deploy in a 2.56 before, worked fine.

 

[thinker]

Oh sorry, I meant like a D12-52

 

[Justin Horne]

Ok, then yes, im sure it could. On the rocket I did it with, the charge was moving ~1.5 pounds of payload, and a 36 inch nylon chute, and shock-cord, so unless your cone is glued on, youll be fine...)

 

[thinker]

hehe cool, thx

 

[Micromeister]

usually on my BT-80 D12 powered models I use a BT-55 or BT-60 stuffer tube between the MMT and the Chute compartment. I've found a 12 to 14" chute compartment will handle up to a 48" nylon Hemi chute or two smaller chutes easily.
Hope this helps.

 

[thinker]

actually thats very helpful, I'll be doing that instead. thx for the info

 

[adrian]

Using a B6-0 or C6-0 to blow the nose off a paralle stage booster: yes, I have done this with a couple of models. I haven't tried it with a BT-60 but I have done it with a fairly long BT-55 - four of them, to be precise, on my Thunderbird missile.

Using a D12-5 to blow the parachute out of a BT-80: yes, the Thunderbird's sustainer does it. But in a couple of models using BT-80, I've fitted a piston made from a BT-80 coupler and a balsa disk, partly to improve ejection reliability and partly to save on wadding.