stunthanger.com
Building Tips and technical articles. => 1/2 A building. => Topic started by: ray copeland on April 04, 2008, 10:04:19 PM
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Rumbler kit from Minnesota Modeler. Great kit, perfectly fitted pieces and easy assembly. Sporting a Norvel .061 ame with in-wing bladder and weighing in at a hefty 5.8 oz. w/o fuel. Can't wait to get this one on a set of 42 foot lines!! >:D
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Say Ray, looks pretty good...get ready for a handful!
You'll have a blast.
--Ray
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Ray, that looks like it would truely be a blast to fly. Hope it flies as well as it looks. DOC Holliday
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Hi Ray,
Looks really good!
Noticed the fuel pinch off. Are you running pressure, or a balloon tank?
Bill
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Hi Bill, this one is pressure, ame's mostly require either muffler pressure or a bladder. Have never tried crankcase pressure. I actually have run a couple of ame's on balloons with a successful 4-2-4 , not really trying to , guess i just had the needle set just right, it was pretty impressive with these little motors on 30 foot lines like i fly in the backyard. In my opinion for stunt flying 1/2a's, balloons don't get the credit or the research and refinement they should. If the engine you are using does not require pressure i would much rather use a balloon than any hard tank i have tried. I am still researching this theory but right now it is 2 to 1 in favor of balloons. Still trying to find the right set up for the holding tank for up to 1 oz. Would love to find a way to use a thick baggie to hold the balloon on the plane instead of a plastic bottle. Still looking, that's what makes this a never ending search!, and fun!
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That Rumbler is one mean flying machine...you better not try it on 30' lines! 42' recommended.
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Ray,
Thanks for the info.
Jim Walker came up with a brilliant idea for a balloon tank holder, over fifty years ago!
His RTF Firebaby used a simple molded canopy, that snapped onto the balsa fuselage right behind the engine mount. The hollow canopy held the balloon tank, with a small hole in the front of the canopy for the fuel line to exit. I don't remember what kind of engine runs I got with that set up, but it must have worked pretty well, as many of us have very fond memories of flying the Firebaby successfully!
The tank was a bit higher than most would like on a modern stunter, but the Firebaby flew mostly upright anyway, with that undercambered wing.
Bill
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For holding the balloon, check out my Sky Sport model. Those cheek cowls are really a tank holding box! ;D
The model was published in Flying Models July 2007 and is now an RSM kit, so you can look at it on Eric's website: www.rsmdistribution.com
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Clever. Looks good too.
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So far, it has racked up 3 trophies in 1cc competition and a first place in Advanced Profile at the Southwick Memorial contest in Phoenix. A highly competitive design! (Modesty is only one of my MANY virtues) VD~