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My bad, I was thinking about the 2408-21, which I now am reminded is a 1400kv motor. My point was that a higher KV and higher wattage motor will fly a plane better (easier, faster if propped for it) than a lower kv/lower wattage motor. Which i think Jack said more eloquently 8^) The upshot being as Emulsifier has found, the 2410 pulls the heavier plane around relatively easily from his observed capabilities and flight times, while the BW is working awfully hard to move even the lighter one.
My heaviest plane so far (quicksilver) is about 20oz (566gm), I've flown it with a bm2410-08 and sf9x7.5prop on 3s. Flys well (though I'd like a bit more speed and have since swapped in a 1400kv hobbypartz motor), but I wouldn't think of trying a 1300kv BW in it. My 42" span BluBaby is only about 14-15oz depending on battery, and with the 2410-08 and gws1080dd prop (on 2s) it's a nice overall flyer. Going to 3s and a 9" prop, she's definitely more spritely. My experience with the BluWonders is on planes in the 7-10 oz range and they fly them pretty well. The 1300kv is a nice easy flyer on 2s with an 8040prop. The 1700kv motors with 7x6sf and 2s on the SEMFF combat warbirds (7-8oz) fly pretty warbird-like. I also have a BBP51 that weighs 10oz and spans 35", and I fly it with the same motor/prop on 1k 3s and it flys like a warbird should. I'll admit I'm a lot less scientific in my motor/prop selection, as I typically use the wattmeter to check amp draw and insure I'm not cooking the motor, then take it out and fly. If I'm satisfied, good, if not then try another pitch or dia prop and recheck/re-flight test. But then I fly out behind my house, so can tinker to my heart's content as long as the wind's not too bad. |
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I fly my 350 auw bb33 with a 1300kv bw on 2s without any problems. When wind is above 10kmh it only hovers though. Then I switch to 3s on same 8x4 prop and issue is fixed. It's an UC wing, never tried kfm. On that 3s it's really overpowered. Loopings are very tight. Is only RET so limited aero
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Quote:
https://www.rcgroups.com/forums/show...5&d=1216529885 Also i am using gorilla glue. |
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Last edited by insistent; Apr 04, 2011 at 10:47 AM.
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Hi guys, thanks for the replies.
I am going to order another TP 2410 12Y 1000kv motor from GiantCod and pop that on the 33inch KFM3 blubaby. I have two of these motors on 33inch blu babies, one on my heavy blu baby and the other on my dad's blubaby, both perform very well. My dad's turns a 10 x 4.7 and gives unlimited vertical. I will also round the leading edge on the KFM3 wing, top half is 4 mm square spruce and bottom edge is 6mm XPS foam. I will also look at putting the UC wing on the plane and the KFM3 wing on my other blu baby. Will use advanced posting for images next time, live and learn. The blu wonder 1300 will be kept for a smaller backyard flyer next time, maybe a pizza tray plane with 9g servos. |
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Like this.: https://www.rcgroups.com/forums/atta...mentid=2265790 I described several things, so I am not sure which one you don't understand, so pics are 1k words... 3/16" dowels will glue into the leading and trailing edge of the wing. Here is a pic that demonstrates both these techniques in the same pic. https://www.rcgroups.com/forums/atta...mentid=2237745 In fact, on my dowels, I never even used glue, just Scotch gift tape, hundreds of flights, the dowel stayed put. The leading edge is the whole span, the trailing edge only goes from center out to where the taper starts. The ribs are not necessary if you use Blue core, fff or pbIII fff, but I have read others post that the foam board doesnt hold the shape well. Pat |
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Don't mean to interrupt, but just wanted to share my version. Let's call it a McQueen Gulf 917 tribute floatplane. That foam color made it obvious to me.
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double post
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The plan you are following is for the Under Cambered wing. Yes, it has a curve to it. The shape is dictated by curved line at the top of the 2 side fuselage pieces.
The flat wings that you see that have layers to them are the KFM2 and 3 varieties. The UC wing has more lift at a lower speed and is more floaty and therefore designed for slow flight so that beginers can get used to controling the airplane. Its not hard to do, go back to the begining of this thread. There are pics and a video of how you curve the wing, it is not difficult. |
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Democritus ,
That sir, is the finest paint scheme.! I notice a polaris in the background. Another excellent choice for the discerning foamy flyer.!! The polaris was my 3rd and favorite plane so far. Sincerely Pat |
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yes they are foam. and if you do nothing but click on a picture...then scan through nothing but pictures....it will answer alot of build questions.
good choice gorilla glue btw. use white.... squegee excess off and spritz with water from a sprayer 3 or 4 minute s to secure and double check alignment 10 minutes done move on to next step! keep us posted on your progress. lots of help here ask anytime! pat |
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The wing curvature ideally is a 4-40 undercambered wing. Meaning 4% (in height) of the wing root at 40% of the root. It doesn't really matter if you get too much curvature, I've done several that were about 10-40 (10% height) that still flew successfully. Actually I think it gives a bit more lift and floaty feel to the plane, but I have no way of actually measuing that. |
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