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  #31  
Old 04-29-2015, 03:36 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
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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  
Old 04-30-2015, 08:02 PM
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Quote:
Originally Posted by blackshire
Your paternalistic and presumptive attitude ("*when* you light the house on fire..."), plus the distressing tendency of the NAR to just ignore contest ideas and other suggestions from other members I know, have made very easy a decision that I've been wrestling with of late. I know of better and more fruitful places to spend the money that I've been spending on my annual NAR membership dues all these years. The international FAI/CIAM space modeling (model rocketry) community is far more open to input from others--the NAR would do well to learn to do the same thing, especially among its own members. I've often wondered why the NAR's membership has remained small, and its "We don't really want to hear from you if you aren't part of the inner circle--just send us your dues" attitude (which certainly isn't true of all NAR officials, but there are enough to exude that cultural feeling) is a factor. Also:If you think that little of the value of the information it contains, why not just give it away? I'm glad that Orville Carlisle developed the model rocket motor *before* such restrictions were put in place. It was almost in spite of himself that G. Harry Stine teamed up with Carlisle to create the hobby of model rocketry, as he couldn't believe that a mere shoe salesman could possibly have developed a complete, self-contained propellant/delay/ejection charge rocket motor and airframes for them (somewhere, Thomas Edison and other such un-lettered inventors smiled indulgently...).


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  
Old 05-04-2015, 09:25 PM
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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.
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  #34  
Old 03-07-2019, 07:41 PM
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Quote:
Originally Posted by Jerry Irvine
I sense summoning. My tooling vendor could easily custom make such an animal and if GH and a couple others would provide me the precise diameter and depth of the core and the precise diameter and taper of the throat and exit, it would be trivial to make tools for whoever wants them. I suppose one could also modify E9's to D30's as well. I have lost all of my mod notes from the 1970's.

Jerry


Here you go . . .
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  #35  
Old 03-08-2019, 07:56 AM
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Shreadvector Shreadvector is offline
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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:
Originally Posted by Ez2cDave
Here you go . . .
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  #36  
Old 03-08-2019, 08:49 AM
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Quote:
Originally Posted by Shreadvector
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.

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  
Old 03-08-2019, 11:21 AM
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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  
Old 03-08-2019, 11:25 AM
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Quote:
Originally Posted by Shreadvector
The attachment will be useless because it is for a motor that used the old super thick casing.


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.
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  #39  
Old 03-08-2019, 01:09 PM
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I've got some old A5-4's that could be cored....
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