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  #11  
Old 02-01-2021, 08:44 AM
shockwaveriderz shockwaveriderz is offline
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Quote:
Originally Posted by olDave
Not everyone wants to mess with adding electronics, electronic bays, batteries, external controls and switches, testing and arming modes, and all the rest. Many of us enjoy the simplicity of old-fashioned pyrotechnic staging.


EXACTLY. Thank you. said like a true powderburner. PLus there's the added expense and complexity of electronics staging.
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  #12  
Old 02-01-2021, 08:47 AM
shockwaveriderz shockwaveriderz is offline
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Originally Posted by tdracer
Perhaps someone from Aerotech can chime in, but I successfully drilled an F40-4W down to less than a second delay from burnout - story here:
https://www.oldrocketforum.com/showthread.php?t=18716
In short, staged a composite F40W to a BP F15-6 on an Estes Mammoth, using the F40W ejection charge to light the F15. Worked like a charm. My intent was for the ejection charge to fire less than a second after burnout - which is just what happened.

My concern with doing that AP to AP is that AP is far harder to ignite than BP - I don't think 4F black powder will reliably ignite AP. Perhaps if some small bits of AP propellant were added to the BP ejection charge?
I'd certainly do some ground testing before I tried flying it...


you know...in that link you posted username 5x7 says AT had booster motors in the 80's with 0 delay times......that's an interesting historical footnote that I was aware of..... if true, I wonder why they ceased making them? Has the internals of composite motors changed all that much since the 80's? I know Gary was active all the way back to the mid-70's with composites and he was part of SSRS ? (Crown Rocket Technology) and Composite Dynamics and other very early composite motor manufacturers back then.

sure enough.... I just got through reading a 1982 Crown Technology catalog (over on Niinfingers) and it has -0 composite motors . So what happened to -0 composite motors.?
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  #13  
Old 02-01-2021, 10:06 AM
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Chas Russell Chas Russell is offline
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If I recall correctly, the "booster" motors had a short delay and ignited a length of theralite to start the upper stage motor. Never did it so don't know how reliable that technique was. The big issue today is the unavailability of thermalite. The little that I have, for "historical" purposes, is probably unreliable. Usually the thermalite was sheathed in teflon tubing which greatly increased its burn rate.

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  #14  
Old 02-01-2021, 03:36 PM
shockwaveriderz shockwaveriderz is offline
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Quote:
Originally Posted by Chas Russell
If I recall correctly, the "booster" motors had a short delay and ignited a length of theralite to start the upper stage motor. Never did it so don't know how reliable that technique was. The big issue today is the unavailability of thermalite. The little that I have, for "historical" purposes, is probably unreliable. Usually the thermalite was sheathed in teflon tubing which greatly increased its burn rate.

Chas

thanks Chas.....back to the past into the Future
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  #15  
Old 02-01-2021, 03:50 PM
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I think the boosters were all endburners, it made the timing of burnout and staging easy.
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  #16  
Old 02-01-2021, 11:58 PM
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ghrocketman ghrocketman is offline
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It's another giant CROCK OF CRAPOLA from BATFE that Thermalite is not UNregulated.
Another Non-explosive they have granted power upon themselves to regulate.
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  #17  
Old 02-02-2021, 12:54 AM
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Quote:
Originally Posted by olDave
Not everyone wants to mess with adding electronics, electronic bays, batteries, external controls and switches, testing and arming modes, and all the rest. Many of us enjoy the simplicity of old-fashioned pyrotechnic staging.


I’m in that boat. The last time I went out to fly high power, back around 2000, I had a whopping two flights. Both were dual deploy. Granted, things are a little easier now, but I drove home questioing what in the world was I doing — driving that distance and getting two flights.
I fly F and G reloads occasionally, but I am in full “nostalgic model rocket building and flying” mode. I missed out on some great kits in the 70s and early 80s when I was in college, and then getting married and starting a family. I’m still on the lookout for some of the great kits from that time period.
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