#31
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Most industries have a strong after-market vendor ecosystem. Model rocketry in uniquely mono-vendor, at any scale.
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#32
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Exactly... why I'm not a NAR member... No way will I spend $60 bucks on a NAR membership-- too little bang-for-buck return... and you're right about the general attitude *I* have experienced from NAR HQ before... I have to agree with everything you said, unfortunately. Later! OL JR
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#33
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Does anybody here know how to contact the author of this book, David G. Sleeter?
http://www.amazon.com/Amateur-Rocke...or+construction If you are serious about building core burning black powder motors, this is The Book. |
#34
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Here you go . . . |
#35
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The attachment will be useless because it is for a motor that used the old super thick casing. When they developed the modern thinner walled casing they were able to made a full C motor in the 18mm casings.
These super thick casings were the reason for Shorty motors. Cut off the unused mass of the 1/4A, 1/2A and A motors. B motors needed the full length. Estes has not made motors using that thick walled casing with the much smaller diameter internal propellant grain since the 1970's. Quote:
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-Fred Shecter NAR 20117 (L2) Southern California Rocket Association, NAR Section 430 |
#36
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In addition to the wall thickness issue, it doesn't give a measurement for the depth of the core. You have to extrapolate. There is a good chance the drawing's core depth isn't to scale.
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#37
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Re-reading the new posts in this old thread may cause me to dig out my homemade brass pintels, cut up some New England paper tubes and inhale some homemade black powder dust. Can't be any worse than congestive heart failure!
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#38
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Well, I guess the alternative is to use the "Guess, Drill, & Pray" method . . . Let us also not forget that the BP used back then was more energetic than current BP. |
#39
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I've got some old A5-4's that could be cored....
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