#11
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Sadly, neither of us has that level of interest in the topic. Sounds like you do, however! Go for it and add to this thread. Research has been done on the duct sizing - Blackshire has the reports if you want them. No "rocket head" judges to worry about - this is a small scale event. Recessed motors, ducted motors, etc, in my experience, result in short-lived rockets due to scorching. Yes, you can add a certain amount of thermal protection, but you still get bubbled paint and burn damage. I did a finless rocket that was destroyed (burned through) after just three flights. A true ducted rocket fared much better. |
#12
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[1] The MBDA Meteor air-to-air missile (see: www.google.com/#q=meteor+ramjet+missile&* ); [2] The Orbital Sciences Corporation (OSC) GQM-163A Coyote supersonic target (see: http://www.google.com/#q=gqm-163a+c...rget+vehicles&* ), and: [3] The LTV ALVRJ (Advanced Low-Volume Ramjet [sometimes called Air-Launched Low-Volume Ramjet]), see: www.google.com/#q=Vought+ALVRJ&* I hope this material will be helpful.
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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 Last edited by blackshire : 03-12-2017 at 08:24 PM. |
#13
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There was an article in the Nov 1969 issue of Model Rocketry magazine about this...those old MRm contained a lot of useful technical articles!!!
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#14
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Not a believer in ducted rockets below 18" ID. The effect of putting the motor inside the bottom (or top on retro boost) has observable effects with minimal damage (Centuri Saturn V and this project's coupler concept).
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#15
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11-69 Damon Engineering precursor. Absolute altitude record. Krushnnik P 37+ |
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