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Post by ps360pc on May 15, 2010 23:39:43 GMT 1
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Post by killioughtta on May 16, 2010 3:56:19 GMT 1
The GH2217-06 would be a LOT of power, good KV and should give you a nice ride. And YEAH, that IS a great deal with a 30A ESC. GraysonHobby is known for quality and they're in the U.S. so shipping shouldn't be much.
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Post by ginginho on May 16, 2010 9:35:39 GMT 1
They look like another re-badging of Suppo motors, so pretty good quality. The 1500Kv would need smaller props than stock, whereas the the 950Kv may require a 10 or 11" one. Some more info on these motors (and other windings) can be found here.Pretty good deal if the ESC is OK. |
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Post by ps360pc on May 16, 2010 16:16:24 GMT 1
Sweet thanks guys, I was thinking the 1500kv. Smaller prop yah, but I love the sound when those things wind up to high speed lol. Think I'll give this thing a shot. I'll try to figure out how to post a vid with this and my ailerons when I'm all done upgrading  I'm still a n00b so I doubt I'll go much past half throttle with this thing. |
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Post by flydiver on May 16, 2010 18:41:42 GMT 1
Make sure NOT to use a 'cub' prop. ONLY use the prop specified and it will be smaller due to higher KV. The plane may be faster but will have less torque most likely.
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Post by killioughtta on May 16, 2010 19:10:02 GMT 1
Make sure NOT to use a 'cub' prop. ONLY use the prop specified... Yup, as far as I've learned, you always prop for the power plant and not for the model. I always prop as directed by the motor manual. |
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Post by ps360pc on May 16, 2010 21:57:58 GMT 1
I sent them an email yesterday, and they said it's okay to use a 9X5 if you want to slow it down. Will have a touch more torque, less velocity. Better for a noob to start out with... sound accurate?
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Post by flydiver on May 16, 2010 22:46:26 GMT 1
Does NOT sound accurate. If it actually goes slower with a larger prop and more pitch (speed) then you are probably lugging the motor. This is from the Suppo page: A2217K-6 T 300 - 800 g 9*5 8*4 www.suppomodel.com/9x5 is probably for 2S but they aren't terribly specific about this which is NO surprise on Chinese (anything) specs. I wouldn't do this without a wattmeter. Over propping to grossly over propping motors is up there with the most common mistakes people make. |
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Post by ps360pc on May 17, 2010 16:06:32 GMT 1
Now I'm confused about something They recommend a 8X4 for a 3s and a 9X5 for a 2s Doesn't 3s have more power than a 2s? Why would you want a bigger, harder to turn prop used with a battery that has less power available? I may be completely wrong in my understanding here. Feel free to tear me apart |
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Post by ginginho on May 17, 2010 16:48:04 GMT 1
Now I'm confused about something They recommend a 8X4 for a 3s and a 9X5 for a 2s Doesn't 3s have more power than a 2s? Why would you want a bigger, harder to turn prop used with a battery that has less power available? I may be completely wrong in my understanding here. Feel free to tear me apart The recommendations are related to what is a safe size to use without pulling too many amps for the desirable (or specified) power output. A lower voltage (2S) will require more current to spin the same prop than a higher voltage (3S). The size goes down to keep a similar power output on the higher voltage. You could run it with the 8X4 on a 2S pack, but it wouldn't deliver the power. You could run it with a 9x5 on a 3S pack but at WOT you are likely to be outside of the motors efficient area, and may cook it (excess power in is lost as heat and effects the magnets if excessive over extended periods). This is known as over-propping as outlined above by Fly. |
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Post by ps360pc on May 17, 2010 16:51:42 GMT 1
Wow, I get it! You guys rock, thank you so much I'll be using 8X4 for sure, since I use 3s batteries hehe. |
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Post by flydiver on May 17, 2010 17:27:00 GMT 1
I had the same problem understanding that at first myself. It seems backwards.
Electric motors are constant RPM devices. They attempt to reach full speed depending on the voltage: more volts > faster.
Give them less volts they go slower so you can put a (somewhat) larger prop on. Go from 2S > 3S you've increased volts 30% and it will try to turn that prop 30% faster. If it is just too small a motor to do that then it bogs down, heats up, and ultimately fries. Hot motors are almost a sure sign of overpropping.
People who think they are getting more power by propping up may be getting a tad more if they don't go overboard but they are also making more heat = lost efficiency = shorter flight.
If unsatisfied with power, get a bigger motor and prop it right.
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