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Old Mar 09, 2013, 05:21 PM
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pounditracing's Avatar
Joined Jan 2013
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9oz flying weight motor suggestions.

Hey guys, I'm building an outdoor 3d flat foam plane. It will be running a 20amp esc on 3 cells. Total weight is just under 9oz. My current motor is way to much so I'm searching for a new one but don't really understand all the KV and watt talk. Please help!
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Old Mar 09, 2013, 06:12 PM
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micka80ella's Avatar
Australia, QLD
Joined Apr 2012
360 Posts
http://adamone.rchomepage.com/
Use the wing loading page to calculate your stall speed to then allow you to choose a motor prop combo.
Or post up all the dimensions of the plane and its dry weight and we could have a fiddle with the online calcs to give you an idea.
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Old Mar 12, 2013, 05:06 PM
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Calculate Wing Loading, Area & Stall Speed
Wingspan: inches 26

Wing Root Chord: inches 7

Wing Tip Chord: inches5.5

Or the Average Chord: inches 6.3

Or the Wing Area: sq.in 163.8

Model Weight: ounces 8

Max Lift Coefficient:

WING LOADING: oz/sq.ft 7.3
g/sq.dm

CUBIC LOADING: oz/cu.ft. 6.59

STALL SPEED: mph 13.1

I'm not sure if that is what you were looking for but that is what I get when I put the numbers in.
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Old Mar 12, 2013, 10:00 PM
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United States, FL, Gulf Breeze
Joined Apr 2008
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I like the hobby king 24 gr hextronik 1500 kv motor on my 8 oz scratch built FoMoJo 30

FoMoJo30 maiden (7 min 51 sec)
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Old Mar 13, 2013, 01:33 AM
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Livermore, CA
Joined Sep 2004
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I run the 1300kv 24g Bluewonder from HobbyKing on a couple dozen planes and the 1500/1700Kv as well.
It powers my 10-13ozs planes with better than one to one thrust, about 14ozs of thrust on a 3 cell.
So for a 9oz plane, it should have enough power to do lots of 3D.
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