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A lower temp iron-on covering would be better. Monokote requires high temps, thus expanding the beads. Ultracote is a lower temp covering I believe. Since I've mostly left balsa planes I've lost my covering touch so find paint works fine for me most of the time now.
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It looks way cleaner than paint. Yeah, I think it was Ultracote, iron was warm to touch I think it was about 13o degrees if I remember correctly. |
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If I use binoculars I can see it 3000 Ft up. While also have a telescope with others much distance |
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With a Graupner CAM folding PROP 9*6 I get this numbers http://www.undcon.com/2011/04/18/skywalker-maiden/ (See eagletree High Watts) |
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Welp, I'm putting together a shopping list from RCTimer for my skywalker. I was going to go with either a 1250kv or 1450 kv motor on a 9 inch prop with a 3 cell. I know I've asked this before, but I'd like any final suggestions regarding motors. Does anyone have an opinion on either the 1250 or 145kv motors?
http://www.rctimer.com/index.php?gOo...0&productname= 1250kv http://www.rctimer.com/index.php?gOo...1&productname= 1450 kv http://www.rctimer.com/index.php?gOo...2&productname= 60amp ESC Or maybe I could use the 1250 with a 10 inch prop? Thanks, -P.D. |
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You would have to generate your own test data. Looking at the published data on the 1250 kV motor. Model: BC3536-6 Motor size: Ф35*36mm Shaft size: Ф5.0*53.5mm Weight: 102g KV(rpm/v): 1250 Max Power: 500W Battery: 2-4Li-Po Test Prop: 10x4.7/9x4.5 Ri(M Ω): 0.034 ESC(A): 50A The 500W input is probably what they want to limit the motor to. On 3S (11.1V) the maximum current allowed then would be I=500W/11.1V = 45.5A. So install your prop and run it full throttle while monitoring the current. Any prop that will make the motor draw more than 45.5A is to "big" and you'll have to either or both reduce the OD and/or pitch. If these motors can take the same type of abuse that Scorpions would, my seat of the pants tells me that the 1250 kV unit will probably work with a 10" prop. The 1450 kV motor would be good with the 9" prop. |
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Last edited by henkvdw; Jun 09, 2011 at 12:15 PM.
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I have the Turnigy 3536-1450 with Hobbywing 60ampESC. With a 9x6 pusher, I am getting 60amps on the bench with a 3S battery, and that is too much amperage for the motor rated to 35Amps and 400ish watts. So, I am going to set my throttle travel adjustment on my radio to a max of 40 amps. Even at 40amps, it blows like a hurricane, if I find that I need more power, I might pick it up to 45 amps....
Btw, a 10" prop gets pretty close to anything you might have on the tail boom platform. |
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2 blade
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This is what I'm running. The motor does heat up quite a bit, but I wasn't sure how many amps it was pulling. I'll have to also trim my throttle. And, even on about 1/2-3/4 throttle this will climb at a 45 degree angle. If I run full throttle I can go vertical for awhile. You really don't need this much power, but it's nice having it for reserve power |
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A brushless motor will draw as much current as it can to achieve it's rated Kv RPM with the particular prop. If at 100% throttle it needs 60amps to achieve close to it's Kv, then at 50% throttle it will draw 60amps (or more!) for 50% of the time. (Delivering 50% the overall 'workdone', by consuming half the current load, half the time.) The drop in prop rpm is because the motor can't reach full Kv cause it's powers being cut away by the ESC. This means there will still be 60amps running through the motor coils... rated for 35A. It will heat up a lot and fail very early in life. Down prop it or down cell it, end of. You want a prop, where the motor draws 35-40A at WOT. |
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On the subject of power, I'm on my third outing now with my SW, it feels really under powered im using :-
KMS quantum 2814/09 motor 830 KV and supposed to run 20a continuous Ripmax dragon 45A ESC 9 x 6 APC Thin Electric Prop 3s 5000 lipo One cause of the under power may be the motor timing, motor says 20-30 deg but the esc default is 1 deg and the beeps for programming don't relate to the manual , even had my wife see if she could work them out, but to no avail. Most I'm seeing on the osd is 12amps wot. Could the timing make such a difference, or do I need a different esc , motor, prop?? |
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Last edited by omegamanuk; Jun 09, 2011 at 03:36 PM.
Reason: TYPO
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http://www3.towerhobbies.com/cgi-bin...?&I=LX1634&P=7 |
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Last edited by billyd60; Jun 09, 2011 at 08:11 PM.
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Targetlocman thanks for the quick reply, the motors a 2814/09 not 1814/09 as I typed, will see if I can get a 4 blade prop locally, as I understand it 9 id the diameter and 6 is the pitch, so a 9x 8 say would give more thrust?
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