28mm ARC MOTORS FROM LightFlightRC.com
The latest samples look excellent! We are very impressed. They just look and feel robust. They are undergoing testing now, and results so far are very good.
We are looking to have some more tested with detailed charts depending on how well you can test and make graphs we can send some very limited samples for free or a very low price. The price would be $30 shipped for anyone that just wants to try one on a plane and report current draw and RPM. However, I am hoping to find some people willing to post detailed results on different setups.
I now have samples of the following motors:
Regular Size (79g):
-1 turn (I only have one)
-2 turn (only one left, I'd like detailed results if possible)
I will be testing the one turn, but if it works well and there is demand for it, we will have them made.
The pictures are of the 1 Turn Long, 2 Turn Long, and a 3 Turn Regular.
Thanks for looking.
***UPDATED Specs (PRODUCTION VERSIONS)***
No load Current: 0.7A
No load Speed: 22,000rpm
Rated output: 170watts
Rated current: 20 amps
Rated speed: 17,000rpm
No load Current: 1.2A
No load Speed: 30,000rpm
Rated output: 200watts
Rated current: 25 amps
Rated speed: 21,000rpm
No load Current: 1.7A
No load Speed: 45,000rpm
Rated output: 250watts
Rated current: 30 amps
Rated speed: 32,000rpm
2 Turn Long Can:
No load Current: 1.2A
No load Speed: 26,000rpm
Rated output: 350watts
Rated current: 40 amps
Rated speed: 19,000rpm
Last night I got back from a business trip to Japan and a LightFlight RC 4 turn 28mm motor was waiting for me…thanks Dave!
The kV of the LightFlight RC 4 turn motor is specified at 2000, while a Mega or HET Typhoon 4 turn motor is 2300 and 2200 respectively. So with the LightFlight RC 28mm motor being down on kV by approximately 10% or so this must be kept in mind.
2.80 ounces as received. The case is 1.46” long by 1.1” in diameter. Clear anodized case and end caps.
The wire side end cap had six 0.240” cooling holes, one of the holes is used to exit the wires. The prop shaft end cap as four 0.230” cooling holes, along with four cross pattern mounting holes. The mounting holes are metric threaded as a 4-40 screw as too small and a 6-32 screw was too big. I used a clamp to hold the motor during testing, as I didn’t have the right metric hardware.
The shaft measured 0.123” or 3.125mm; I used a 3.2mm prop adapter.
For bench testing I used a Castle Creations Phoenix 25 and a Thunder Power 3S 2100 ProLite battery pack. New freshly charged packs were swapped in for each prop tested. Current and power were measured with an AstroFlight wattmeter, and prop speed was measured with a GloBee tachometer illuminated with a flashlight to eliminate any errors due to 60 Hertz lighting.
APC 6040 (Speed 400) Prop:
172 watts at a measured current of 15.4 amps. Prop speed was 17,250 rpm; this calculates to a pitch speed of 65.34 mph. I did a couple runs to confirm the measurements, none longer than 30 seconds. No appreciable motor heating was noticed.
It seems with could be a reasonable prop to initially try as the motor is rated at 170 watts and 20 amps. At only 15 amps a smaller capacity 3S lipo packs could be used, but power would most likely be down a bit due to the higher pack impedance.
APC 7050 (Thin Electric) Prop:
256 watts at a measured current of 24.5 amps. Prop speed was 13,380 rpm, this calculates to a pitch speed of 63.35 mph. Again I did a couple of runs, some motor heating was noticed, but the highest temperature I could read with an IR thermometer was only 110 degrees F. I know IR thermometers can have problems making measurements on shiny surfaces, but the “finger test” confirmed only nominal heating.
So the 7050 prop did crank up the power but the pitch speed is actually a bit lower, so virtually all the extra power goes into upping the thrust produced. APC makes a 6055 prop that should push up the pitch speed only, but I didn’t have one available for testing.
Not really knowing yet how the “rated” specifications apply to real world use yet, I’ll first fly with the APC 6040 prop and check motor heating. Initial review and bench testing seem to indicate this is a quality made alternative to a Mega where the ultimate in performance is not warranted. Having another vendor of 28mm inrunner motors would be wonderful as Warp motors are impossible to find anymore and even HET Typhoon motors are getting rare.
Bench testing is great for initial setup selection, but nothing can replace really flying a setup to put it through it’s paces and see what tweaks need to be made. As soon as I get that chance I’ll post my comments.
Palo Alto, CA, USA
Joined Nov 2000
Flew the Mirage two more times today.
3T Motor, 18A, 180W, 3 cell Prolite fresh charge, Graupner CAM 4.7x4.7, 21,500 RPM.
Motor and battery pack are still staying cool.
Again I did a couple of runs, some motor heating was noticed, but the highest temperature I could read with an IR thermometer was only 110 degrees F. I know IR thermometers can have problems making measurements on shiny surfaces, but the “finger test” confirmed only nominal heating.
I think I have 2T,3T,4T of these new and improved 28mm motors coming my way for bench testing (I want to try 'em both DD and geared). As you say, IR guns and shiny cans don't go well together - other than the 60C finger-tip-test, I have had the most success by using a light spray of matt black enamel on the can. Even a paper label stuck on the can and blackened with a Sharpie improves the reading.
Thanks for the guidelines to start me out!
Love It !!
I got my 3 turn in the mail late last week, looks awesome..
I am going to test it in a T-rex with a 16t pinion on 3S. Just waiting on the pinion to arrive.
At the time I wasn't aware of the KV's , so the 3T may not be hot enough for the Heli, if not I'll run it in the funjet or similar. The 2T looks probably more suitable for Trex on 3S, only time will tell. I don't have a lot of 4S packs, but I am sure the 3T would work on 4S in the T-rex.
So far very impressed with it, definately some similarities to the ARC motors..
Look forward to getting some more of these..
Any idea what the final prices will be ?
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