View Full Version : 66" 300s Extra what setup ???

10-07-2006, 12:04 AM
Hi Guys,

This will be my first glow to electric conversion...

My plane is a 66" wingspan 300s Extra...

With all the radio gear in the plane (Servos/Receiver/Receiver Battery) and the plane she weighs in at 5 Lbs 14oz...

I'm looking for suggestions for an AXI motor, Castle Creations ESC and Lipos...

My style of flying will be pattern/artistic aerobatics, not really interested in 3D flying....

Any suggestions would be a great help...

Thanks in advance,


10-07-2006, 05:00 AM
4130/16 (or Eflight Power 60), CC Phoenix 80, 15x10 to 16x10 APC eprop and a 6s lipo that can deliever 50 amps. (TP 4200,4000, 6000,Polyquest 3700,4400 etc)


10-16-2006, 08:12 PM
Start with what you think your all up wait will be.
Then you work from there.

For just good aerobatics around 100 to 125 watts per pound will work
Watts is what fly the plane, Volts x amps = watts

Lets say the plane will weigh 6 1/2 pounds all up @ 100 watts per pound
= 650 watts.
You need to know max voltage and amp draw for motor to be used.
Good to 5S or 18.5 volts and 50 amps
Set up at 45 amps and 18.5 volts would be about 832 watts, Um don't really that much much so now go with
4S 14.8 volts x 45 amps = 666 watts, Now that is what we are looking for.
Now to pick out the battery, Need a battery that will hold voltage at 45 amps
4400 mAh at 12C rate = 52.8 amps, So now we know a battery in the range of 4000 to 4400 will do.
Hope this helps.


10-16-2006, 08:52 PM
Thanks guys....

Looks like I'm going with an AXI 4130/16 with a JetiAdvance PLUS 77 Amp ESC and a Thunder Power 6s 5000mAh eXtreme Series....

Do you guys think this setup will have enough Jam ???

(Plane + Radio Gear = 5lbs 14oz)
(Motor + ESC + Battery= 2.49 lbs)

The end result all up weight will total 8.5 lbs

Thanks again for all your help,


10-16-2006, 09:37 PM
Was going to see what the max watts for that set up would be but AXI does not give the max amp draw in there specs anymore, At least I don't see it.


10-16-2006, 10:29 PM
AXI 4130/16

Voltage range 16-24 cells or 5-8 Li-Poly RPM per Volt 390 RPM/V Max.
Efficiency 88% Max. Efficiency Current 18-40 A (>84%) Max.
loading 60 A / 30 s No load Current/10V 1.8 A Internal resistance 63 mohm
Dimensions 49.8 x 65.5 mm
Shaft Diameter 6 mm
Weight 409 g
Recommended model weight 3000 - 6000 g
Propeller range

16 cell prop 16" x 10"
20 cell prop 14" x 10"
24 cell prop 14" x 8"

10-16-2006, 10:48 PM
:) So @ 60 amp burst on 6S= 1332 watts 156 watts to the pound, Should get you in the air pretty qiuck.


10-16-2006, 11:10 PM
Yep....then it's up to me to try to figure out how to keep it in the air...

It's the old story...is the guy taking the dog for a walk or is the dog taking the guy for a walk ! :eek:

In any case I think it's going to be a lot of fun....

Thanks again for your help Milton...


11-02-2006, 10:00 PM
Yeah, Milton and i fly with a fellow that regularly flies his SIG Kadet Sr. on the 4130/16 and 6S2P 4200 Thunders. about 9-10 pounds All up.
He has flown with 17x10 and 18x10 for a couple years now.

He shortens the life of the batteries with the 18x10 but he is spoiled on the performance. His next packs (from Milton) will handle the amps better.
Your 6S 5000s should do just great.

This doesn't fly like your dad's kadet, this thing is awesome.
It won't pull out of hover, but does everything else well.
He regularly tears up the skies with Cubans/Hammerheads and other standard aerobatics.
So, you should have a blast with that setup.