08-30-2013, 03:33 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Originally Posted by tmacklin
My how time flies!
I have a couple of email addresses for David and that one rings a bell. I think I'll drop him a note just for the hell of it. Thanks!
I don't know if an endburning grain will work with sugar and saltpeter. You'll notice in my video that the thrust portion of the burn only took about 0.75 of a second, followed by a long delay with zero thrust. The thrust happened while the core grain burned and it took about 5 or 6 seconds to burn the remaining 1/2 inch comprising the delay. That's a pretty slow burn when one considers that an Estes C6 goes through about 1.5 inches of BP grain in only 1.8 seconds.
One way to find out.  |
You're most welcome. I haven't viewed the video yet (I have a dial-up connection). Maybe adding a little sulfur to the sugar propellant would slow its burning rate (I believe Dr. Z uses sulfur in his Rapier motors' propellant to do that). Hmmm...an easily-reproducible jet motor design based on the five-cent sugar rockets would enable David to sell another book (he could self-publish it [Print-On-Demand] at no cost)... |