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Old May 06, 2012, 05:12 PM
This Calls for a Sexy Party
StewieRC's Avatar
Minneapolis
Joined Sep 2010
639 Posts
Help!
a little bit bigger than 18-11

whats a power system thats little stronger than my current 18-11 motor with a 6x3 on a 2s ? i want something a little bit bigger and product about 50g more thrust and from hobbyking. How about some blu-wonder ?

p/s : i love my 18-11 system, i just want something a little stronger, my flying field is pretty small so i don't want something too big.
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Last edited by StewieRC; May 06, 2012 at 05:18 PM.
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Old May 06, 2012, 08:10 PM
Jack
USA, ME, Ellsworth
Joined May 2008
16,849 Posts
Here is the test data on your 10 gram 1811 motor at flybrushless.com:

http://www.flybrushless.com/motor/view/619

Here is the 20 gram D2211-1700:

http://www.flybrushless.com/motor/view/429

And here is the 2730-1300 (Silver Wonder)

http://www.flybrushless.com/motor/view/63

There is not a lot of choices between the 10 gram 1811 and the 24 gram 2730. The 2730 will give you double or triple the thrust of the 1811 on 2S.

Jack
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Old May 06, 2012, 09:32 PM
Registered User
Canada
Joined Nov 2000
6,953 Posts
the 2211 is significantly higher power. Actually reasonably close to a 2730, more than one would expect. Seems a few silly millimeters moment arm advantage Does make genuine difference :-)
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Old May 06, 2012, 09:44 PM
This Calls for a Sexy Party
StewieRC's Avatar
Minneapolis
Joined Sep 2010
639 Posts
whats the difference between the price and color of the motor ?

http://www.hobbyking.com/hobbyking/s...idProduct=8614

http://www.hobbyking.com/hobbyking/s...idProduct=6311

i think the silver wonder is too big for my need. ( my 21 inch flying wing eat up space pretty fast at my flying field, but i think i can build a little bigger plane with big motor so i can fly higher - more space up there )
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Old May 06, 2012, 11:18 PM
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Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,179 Posts
Quote:
Originally Posted by StewieRC View Post
They are basically the same, but the '16g' (19g with mount) HXM2211 is $1 cheaper. Which color do you prefer?

You should get about 90g more thrust if you use a 7x4 slowfly prop, so the extra 10g motor weight is not worth worrying about. The 2730-1300 'silver wonder' would be overkill.

BTW I am using an HXM2211 on the tail of a GWS Dragonfly heli, and it runs much cooler and more efficiently than the stock brushed motor! I used a 3 pin servo plug and socket to allow the motor to be unplugged (either deliberately, or by accident) without straining the wires.
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Old May 09, 2012, 11:05 PM
This Calls for a Sexy Party
StewieRC's Avatar
Minneapolis
Joined Sep 2010
639 Posts
how big of a flying wing do you think i can build with the hexTronik 1700kv motor ?
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Last edited by StewieRC; May 09, 2012 at 11:23 PM.
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Old May 10, 2012, 06:19 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,849 Posts
The 16 gram HXM2211-1700, right? There is some prop testing data on that motor at flybrushless.com that will give you a good feel for the amount of thrust you can get with various sized props:

HXT - D2211-1700 - http://www.flybrushless.com/motor/view/429

Looking at that I'd think it would be good on builds that were in the 8-10 oz. or so range. The rule of thumb is that 0.33:1 is the minimum thrust to weight ratio for flight and that 0.5:1 is adequate for all around sports flying. So with 8 oz. of thrust even a 16 oz. build could still be a nice flyer.

A good candidate might be one of the scaled down Divinity 42 builds. That thread has info, and in some cases even plans, for 14, 16, 24, 30, 32, and 42 inch builds. The 14" build used the ultra light Plantraco electronics and motor.

The Divinity 42 build with Dollar Tree Readiboard foam were usually ready to fly at about 10 oz. or so so the Divinity 32 might be a good candidate. The plans for that one are here:

http://www.rcgroups.com/forums/showp...&postcount=202

My Divinity 32 built with foam board was right at 10 oz. ready to fly with a 2S 900 mAh LiPO
and a EMAX BL2205/22 (29 gram) motor. That motor was used because it was the lightest motor I had at the time but it was much more power than was needed. The plane flew nicely on a fraction of the available power and was like way beyond my talents or abilities at full throttle.

Jack
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Old May 10, 2012, 10:13 PM
This Calls for a Sexy Party
StewieRC's Avatar
Minneapolis
Joined Sep 2010
639 Posts
thanks, look like i'll order the HXM2211-1700, whats a good prop and esc combo ? 2s or 3s ?
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Old May 11, 2012, 05:33 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,849 Posts
The flybrushless.com link I posted above has some 7V (2S) prop testing data that should help you, and Dr Kiwi posted some 2S and 3S testing data here:

http://www.rcgroups.com/forums/attac...mentid=3662512

That is a 7A max motor so a 10A ESC will give you a little reserve, using an ESC that is rated 20% or higher than you'll need is a good thing for the ESC's service life and survivability.

If you want to zoom around fast look at the testing combos with the smaller direct drive props and 3S voltages, for slower flying, the slow fly props (on 2S or 3S as tested) work well.

Jack
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