What prop/battery/esc....for my motor? - RC Groups
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Jul 04, 2011, 04:10 PM
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What prop/battery/esc....for my motor?

Hello, I bought a motor from Castle Creations when they were having their garage sale.

There was very little info on the motor since it was a sample run for them to test.

here are the specs....

Weight - 350 grams
KV - 770v

I was wondering if anyone knows what prop/esc and battery combo would be best. It will most likely be going on a 3DHS 57" Extra 330 SC if it will work.
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Jul 04, 2011, 07:29 PM
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meshyx's Avatar
To match motors, you just need the weight and KV to get pretty close. I couldn't really find anything at hobbyking though. You should root through some online vendors and see if you find anything similar, and see what props / batteries they recommend.
Remember that the voltage you run it at will also determine the prop size.

A rule of thumb is 3 to 5 watts per gram of motor weight, so 1000w to 1700w for your motor.
Jul 04, 2011, 07:43 PM
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rick.benjamin's Avatar
Does your motor look like this? And, what is the shaft size?
Jul 04, 2011, 09:29 PM
Registered User
Originally Posted by rick.benjamin
Does your motor look like this? And, what is the shaft size?
My motor is green and it is a outrunner. The shaft size is 5mm.

I would like to use a 15" or 16" prop for 3d with plane if that helps.
Jul 05, 2011, 01:07 AM
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rick.benjamin's Avatar
What I think you have is a custom NEU motor.
I think it may be similar to a .46 glow fuel.

Meshyx is correct, and the size can be guestimated.

I have been collecting motor info on a database and see a corolation between shaft size, motor weight.

A low kv tells me this motor has lots of torque to swing a larger prop.

Here's a snapshot of the area I look at
Shaft weight kv batt cost name
5mm / 122g / 1100kv / 2-3s / $59.99 / E-flite Power 10
6mm / 290g / 0670kv / 4-5s / $89.99 / E-flite Power 46
8mm / 310g / 0670kv / 4-5s / $28.50 / MonsterPower 46
8mm / 420g / 0400kv / 5-7s / $35.40 / MonsterPower 60
Jul 05, 2011, 01:12 AM
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rick.benjamin's Avatar
"Exceed-RC's Monster Power Series motors give .10 to 1.60 size models the clean quiet convenience of electric power with an emphasis on power and durability. Pitted against any other their equivalent glow engine counterparts, these lightweight, high torque, high output motors will more than satisfy the most power hungry pilot.
The Monster Power 46 is designed to deliver the unordinary electric power for .40 to 46-size sport and scale rc planes weighing 4.0 to 7.0 pounds, .25 to 40-size 3D airplanes up to 5 pounds (2.2 kg), or airplanes requiring up to 925 watts of power. It is especially designed for the Hangar 9 .40-size trainers like the Alpha .40 (HAN2450), Arrow .40 (HAN2625) and warbirds like the T-34 Mentor 40 (HAN2425). Also a great match for sport planes like the Ultra Stick 40 (HAN1675 or HAN1690), Seagull Spacewalker 40 (SEA2050), and smaller sport 3D planes like the Twist 40 (HAN2650). "
Jul 05, 2011, 01:23 AM
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rick.benjamin's Avatar
Folks discussing this motor
Says monster motors equate to E-Flight Power series which recommends props 12x8 to 14x10 props

Your very best friend will be the wattmeter and a thermometer to work-out the particulars of your motor.
Good Luck

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