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electric motor = 50 glow size

Old 03-28-2020, 07:12 PM
  #1  
skyhawk940
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Default electric motor = 50 glow size

Building a Curtus Wight T-32 Condor, twin. Plans call for .50ci glow powers. Looking for electric motors of that size. All of the specs are very confusing. A good motor size would help. Limited to 10.5 inch three blade props. Thinking a 6s battery. Will match ESC's to requirments of motors. Thinking around 800KVA motors and 70 to 80A ESC. Am I close? I don't want to over or under kill it. Not sure what the plane will weigh. Thinking 13 to 15 pound range.
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Old 03-28-2020, 08:35 PM
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Wildflyer
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Probably a couple of Power 32's would work.
I have a motor I bought on Ebay, they called it a power 30 800KV (off brand) it has insane power. It will take my LT25 trainer at 6 1/2lbs straight up until you can't see it. Even it is using a 12x6 prop.
I think the Condor is a beautiful plane. You could slide the motors out a little for a bigger prop unless you are going to be scale judged.
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Old 03-30-2020, 02:08 PM
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skyhawk940
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What voltage battery are you using, 3s, 4s This is a BIG 82 inch wingspan, biplane
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Old 03-30-2020, 02:14 PM
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Default photo T-32

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Old 03-30-2020, 02:26 PM
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solentlife
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Try using eCalc .... for the pennies registration its well worth it .... I have good sense of what motor for a job, but I still use eCalc as confirming ...

Put in the details . span .. weight ... prop size .... possible battery sizes ... ESC size etc then play about with the motor section ...

You may be surprised what it comes up with ... and it will give you flight time / speed etc according your choice. If the motor / battery combo is not ideal - it will give comment ...
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Old 03-30-2020, 03:04 PM
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skyhawk940
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I don't know what it is going to weigh until it's done. There is no weight on the plans. The plans call for two .40 glow. I like a little extra power, but not way too much. Looking at a 4250 800kva.
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Old 03-30-2020, 05:40 PM
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solentlife
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Originally Posted by skyhawk940 View Post
I don't know what it is going to weigh until it's done. There is no weight on the plans. The plans call for two .40 glow. I like a little extra power, but not way too much. Looking at a 4250 800kva.
I have a 4250 650KV with 5S LiPo on a 13x8E prop. AUW of 2.2kg ... with thrust of 3.4kg ........... ballistic !!. model designed for a 35 - 40 glow.

I have a 4250 500kv, 5S swinging a 13x6 on my Elerc Tiger Moth ... thrust again is well over 3kg

Far too much power for either .... 4S is more than enough.

If you are going to use 800kv ... then maybe a 11" or 12" prop ...
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Old 03-30-2020, 06:18 PM
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Wildflyer
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Originally Posted by skyhawk940 View Post
What voltage battery are you using, 3s, 4s This is a BIG 82 inch wingspan, biplane
My plane is using a 4s battery.
I don't have any brand info on my motor, but they claimed it could handle 1100 watts, I have it propped to about 800-850 watts on this 6+ lb plane. I don't want any more power. It will take off from stopped to flying in about 6 feet if I hit it all the way.
Your plane is going to have much more parasitic drag than mine, so you will need good power, the drag effect increases with speed.
Just seems like the prop size restriction is going to limit your choices. Use E-Calk it may help a lot. I just kind of wing it.
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Old 04-07-2020, 10:33 PM
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If you're expecting the airplane to come in around 13-15 pounds, you'll probably be looking for motors that can pull around 700W each. I like to use a baseline of 90-100W per pound for scale models. This gives you enough power to get out of a trouble spot but you can do most of your flying around 50-60%. From there, you can figure out the prop/battery combination that gives you the needed power while maintaining a scale look with adequate ground clearance for the prop.

Many motors in the 35mm range at 700-800KV will give you good performance with a 4S pack. If you're looking to spin a larger prop, you'll probably need to move up to a 42mm motor size and drop into the 500KV range as suggested above by Solentlife.

Many motor manufacturer websites will have motor performance data which will show the motor performance with different cell counts and propellor sizes/types. This will be a good guide to narrow in on a choice.

That's a beautiful and unique model you're building. Invest the time in specing the components.
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