28 ounces is 1.75 Pounds. So you want something in the 175 to 250 watt range. You can always stack in more but that is the range I would consider for plenty of power.
Using the electrify calculator we can see what they would recommend in an Rimfire out runner.
I set the max prop to 10 inches. You could go larger if you like
I will set battery at 3S
Aerobatic performance
[TABLE]
[TR]
[TH]Best Combination
[/TH]
[TH][/TH]
[/TR]
[TR]
[TD="align: right"]Performance
[/TD]
[TD]Aerobatic
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Electrifly Rimfire Motor
[/TD]
[TD]35-30-950 / GPMG4590
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Ratio
[/TD]
[TD]N/A
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Drive
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Propeller
[/TD]
[TD]10x4.5 in., Electric
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Battery
[/TD]
[TD]1250 mAh, 11.1v
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD="align: right"]ESC
[/TD]
[TD]SS-35 / GPMM1830
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]ESC Motor Adapter
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Motor Mount
[/TD]
[TD]Medium / GPMP1255
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Current Draw
[/TD]
[TD]18.1 amps
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Speed
[/TD]
[TD]29 mph
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Thrust
[/TD]
[TD]28.6 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Weight of Power System
[/TD]
[TD]7.53 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Flight Time at Full Throttle
[/TD]
[TD]4 minutes
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Watts per Pound
[/TD]
[TD]114.29
[/TD]
[/TR]
[/TABLE]
Or this for very high performance
[TABLE]
[TR]
[TH]Best Combination
[/TH]
[TH][/TH]
[/TR]
[TR]
[TD="align: right"]Performance
[/TD]
[TD]3D Flyer / High Performance
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"] Electrifly Rimfire Motor
[/TD]
[TD]35-30-1250 / GPMG4595
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Ratio
[/TD]
[TD]N/A
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Drive
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Propeller
[/TD]
[TD]10x7 in., Electric
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Battery
[/TD]
[TD]2100 mAh, 11.1v
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD="align: right"]ESC
[/TD]
[TD]SS-35 / GPMM1830
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]ESC Motor Adapter
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Motor Mount
[/TD]
[TD]Medium / GPMP1255
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Current Draw
[/TD]
[TD]27 amps
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Speed
[/TD]
[TD]54 mph
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Thrust
[/TD]
[TD]39.9 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Weight of Power System
[/TD]
[TD]10.13 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Flight Time at Full Throttle
[/TD]
[TD]5 minutes
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Watts per Pound
[/TD]
[TD]171.4
[/TD]
[/TR]
[/TABLE]
Last edited by aeajr; 01-28-2014 at 09:08 PM.