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  #31  
Old 08-27-2013, 04:29 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by Ez2cDave
Don't forget the October Science "BRAVO-NINER" motors . . .

http://www.privatedata.com/byb/rocketry/octoberscience.pdf
All I got when I clicked on the URL was an "Address not valid" message.
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  #32  
Old 08-27-2013, 09:27 PM
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Quote:
Originally Posted by blackshire
All I got when I clicked on the URL was an "Address not valid" message.


http://www.privatedata.com/byb/rock...oberscience.pdf

I just tried this and it worked

http://tinyurl.com/p5llq24
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  #33  
Old 08-27-2013, 10:01 PM
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Originally Posted by Ez2cDave
Thank you for re-posting this! The sugar propellant is certainly much safer to mix and "pour" than the zinc/sulfur propellant. While the PVC motor case could potentially form shrapnel in the event of a CATO, it's safer than a metal case.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
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http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
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  #34  
Old 08-27-2013, 10:41 PM
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Quote:
Originally Posted by blackshire
Thank you for re-posting this! The sugar propellant is certainly much safer to mix and "pour" than the zinc/sulfur propellant. While the PVC motor case could potentially form shrapnel in the event of a CATO, it's safer than a metal case.


I never messed around with Zinc / Sulfur aka "MICROGRAIN" . . . I have heard that static electricity could set it off, right in your face.

http://www.raketenmodellbau.org/repository/archive/704
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  #35  
Old 08-29-2013, 11:19 AM
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Here https://www.youtube.com/watch?v=gdEije_CvQg is a 1/2" ID KNSU motor built according to specifications in David Sleeter's book, Amateur Rocket Motor Construction.

Produced almost 2 LBS peak thrust on 9 grams of fuel. Not bad and I still have all my fingers.
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  #36  
Old 08-29-2013, 04:40 PM
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Quote:
Originally Posted by Ez2cDave
I never messed around with Zinc / Sulfur aka "MICROGRAIN" . . . I have heard that static electricity could set it off, right in your face.

http://www.raketenmodellbau.org/repository/archive/704
It is static-sensitive, yes. I believe Dr. Z (Dr. Jan Zigmund) used a deliberately "watered-down" (intentionally "oxidizer-rich" or "oxidizer-lean") zinc/sulfur mixture in his early Rapier single-use jet motors (Jetex replacement motors), but abandoned it because of the combination's sensitivity.
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http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
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  #37  
Old 08-29-2013, 04:46 PM
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Quote:
Originally Posted by tmacklin
Here https://www.youtube.com/watch?v=gdEije_CvQg is a 1/2" ID KNSU motor built according to specifications in David Sleeter's book, Amateur Rocket Motor Construction.

Produced almost 2 LBS peak thrust on 9 grams of fuel. Not bad and I still have all my fingers.
Your video doesn't have descriptive text accompanying it (having a rather slow connection, I haven't downloaded and watched it yet). Does KNSU stand for potassium nitrate (KN) sulfur (SU)?
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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Last edited by blackshire : 08-29-2013 at 04:47 PM. Reason: This ol' hoss done forgot somethin'.
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  #38  
Old 08-29-2013, 06:46 PM
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Quote:
Originally Posted by blackshire
Your video doesn't have descriptive text accompanying it (having a rather slow connection, I haven't downloaded and watched it yet). Does KNSU stand for potassium nitrate (KN) sulfur (SU)?


KN = Potassium Nitrate
SU = Sucrose (confectioners sugar)

Sleeter refers to this fuel as KS in his 2004 book, which also contains a small percentage of sodium bicarbonate (baking soda) to reduce the burn rate. There is no sulfur in this formula as there was in the formula referenced in the Bravo Niner booklet and as originally published in Sleeter's earlier efforts. Sleeter uses a dry rammed method and the motors produced are core burners.

I don't wish to disclose Mr. Sleeter's exact formulas as his work is copyright protected. Used copies of his 2004 book is available through Amazon by various vendors at inflated prices.
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  #39  
Old 08-29-2013, 07:19 PM
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Thank you. He sent me a couple of his "The Incredible Five-Cent Sugar Rocket" reports and Micro-Sonde model rocket plans a little while back. I used to have his book on making black powder motors.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
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  #40  
Old 08-29-2013, 09:05 PM
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Quote:
Originally Posted by blackshire
Thank you. He sent me a couple of his "The Incredible Five-Cent Sugar Rocket" reports and Micro-Sonde model rocket plans a little while back. I used to have his book on making black powder motors.


You are most welcome.

Hmmm, "....a little while back". Like how long ago? The reason I ask is I haven't or seen much about him in a good while. He seemed to have vanished from the mid-nineties until he published his masterpiece in 2004. I wonder, is he writing another book?
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