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The CiCi is also great. Mine has gotten stuck in the same tree twice and tumbled out the next day.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
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All of my gliders have been scratch-built from plans, and I have never put a drop of paint or any other kind of coating on any of them. I do carefully trim them so that they make respectable glides of 20-30 feet with hand tosses, but none of that is ever evident following a rocket-propelled boost into the sky. In the one good glide that I have gotten over the years the glider descended at about a 30-35 degree angle relative to the ground. The rest have been anywhere from 45 degree to over 60 degree parabolic flights. They have all been front-engine motor pop types like the Estes Falcon and the AMROCS Wombat. The one good glide was with the Wombat on a 1/2A6 and it had more than a little help from a gust of wind that blew across the field at just the right moment. I also tried several times to construct a flyable Astron Invader, tweaking the angle of the motor in relation to the wing, with zero success. (Every flight arced right into the ground under thrust, with the impact breaking the glider.)
I did build an Edmonds Micro Deltie once for competition, but upon ignition the glider shattered under the thrust of the 1/4A motor. I don't know what kind of magical touch is required to get anything like these to glide following a boost into the sky; I have never been able to find a way to acquire it even though I have been diligently searching for it for years.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#13
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#14
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Man, I can't imagine why you have such poor luck with your gliders. The Falcon and Wombat are not going to give you the best gliding performance, but they ought to do better than that! Do you know anyone who flies gliders well, or can you take a model to a launch/contest where there are folks flying gliders? Most anyone I know who flies gliders would be more than happy to check out your model and see what's going on. If you still want to give it a go, try the Tercel or Swift (front engine pop pod kits). For a minimal investment you can build one from the plans on the NAR boost glider page There are some complex models there, but the Honeybee, Delta Z, and Flybaby look to be pretty simple. The Manta is a pretty bullet proof glider of modest capability. Many use it to insure a qualified flight and many have won contests with them. There are articles on trimming and other techniques. Some of the other plans provide lots of detailed instructions for how to sand the airfoil and built the model that would apply to other designs. You can do this. Don
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Don SAM#513 NAR #11069 |
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In his "Handbook of Model Rocketry," G. Harry Stine wrote about 'fair-weather models' and 'foul-weather models' where boost-gliders (B/Gs) are concerned. The slower-gliding fair-weather B/Gs are somewhat tricky to trim (and sometimes -very- tricky to trim). They also require calm or nearly-calm wind conditions. The faster-gliding 'foul-weather' B/Gs have higher wing loading (they are heavier and/or have smaller wings) and good wind penetration, and they are less prone to being 'upset' (knocked into a stall or spin during the glide) by changing wind currents aloft. Such B/Gs are usually easier to trim for a good glide, and they also have more stable boosts because of their higher wing loading. Also: There are several 'foul-weather' boost-gliders that I think would work well for you. The Centuri Mini-Dactyl (see: http://www.semroc.com/Store/scripts...arts.asp?ID=591 [Semroc has *all* of its parts available!]) can fly with either one or both of its two delta wing/canard gliders, which makes it possible to simultaneously test two trimming techniques in one flight. The Centuri Hummingbird (see: http://plans.rocketshoppe.com/centu...F-2/cenKF-2.htm , https://sites.google.com/site/centurihummingbird/ , and http://www.semroc.com/Store/scripts...arts.asp?ID=566 ) is also a good 'foul-weather' B/G--it could also be flown with the streamer-recovered 13 mm motor mount that will come in Semroc's soon-to-be-released Red-Eye kit. The Estes Condor (see: http://www.semroc.com/Store/scripts...arts.asp?ID=134 [Semroc also makes its parts]) is another good one; being a parasite B/G that rides on the back of a large booster, it has straight and stable ascents. I hope this information 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 : 07-20-2013 at 01:27 AM. Reason: This ol' hoss done forgot somethin'. |
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I have had very good luck with the mini Dactyls. They are easy to build and trim.
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#17
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A Hummingbird clone flyway prompted this thread. I built it using the above recommended sites/plans, plus PDFs of the printed colors from another thread here at YORF.
I printed the parts with a laserprinter on wholesheet label stock, stuck it to heavy fiber file folders I found, and cut it out. Painted all none-printed surfaces - so a heavy glider. Not (usually) a long flier. Fast. Makes sudden lateral moves than can make for a long walk. But it had some really cool flights - cruising level just above the orchard trees, with the delay smoke trail coming out so it _really_ looks like powered flight. |
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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 : 07-21-2013 at 08:56 AM. Reason: This ol' hoss done forgot somethin'. |
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The flyaway was on an A8-3. I find that no matter how straight it boosts, at the end of boost, it arches over backwards in a large loop and levels out sometime before ejection. Except the flyaway, which did a tight loop up high and then glided out of sight.
I've read about the loop over and glide behavior with another kind of ejection glider - but I can't recall which right now. The BT-50 based Hummer Upscale I fly with an engine adapter that has a washer glued to the top. (And a streamer). Behaves the same. I think I've flown that one on a B - and fished it out of shrubs in an oak/hickory stand. Complete luck it didn't hang up higher. I've two gliders I've had no luck with. My Ringhawk downscale does the sliding transition - but never seems to have any forward motion afterward - it just falls gently to earth. My Flying Stovepipe is great with hand tosses - but I can't get the booster to disengage. |
#20
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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 : 07-21-2013 at 10:57 AM. Reason: This ol' hoss done forgot somethin'. |
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