NTM Prop Drive motors are rock-solid performance outrunners with tight windings, quality bearings, correctly rated magnets, balanced stator and flux rings, tool-steel shafts plus they are QC checked at 14 points, from material processing all the way through to final dyno test.
Because we design and build these motors completely in-house (from 3D/2D drawing to materials sourcing, machining, balancing, final assembly and dyno) we can completely control production and ensure product consistency from design right through to shipping the product to you. The removal of middle-men has meant we can drive better value to the market and retail these motors at factory(our) prices! All performance figures are real and tested on our own motor dynos.
Our QC engineer checks and balances each motor before shipping to the HobbyKing.com warehouse.
I got this motor to go in my Precision Aerobatics Extra MX. The plane is designed for the PA Thrust 50 motor, which is even more powerful than this one but costs crazy money by comparison. The NTM 42-58 delivers plenty of grunt for this light weight 60inch span plane and drops straight in with no modification to the plane. I'm running a 6S 2800 Lipo, Hobbywing 80A ESC and a 15x8 wooden prop (Vox). This setup draws about 54 amps at full throttle, which works out a bit less than 1200 watts. The snag is that it squawks terribly on about 10%-30% throttle and it's difficult to break out of that speed range. I've tried all three timing settings on my ESC, I borrowed a 100A ESC from a friend - same problem, I tried smaller prop sizes so less power was used but same problem. I've taken the motor apart, magnets all look fine, nothing rubs, bearings seem good. Prop adapter is tight on the shaft, in fact I need to use a puller to release the adapter collet. WTF? Why can't I get this to work? Any ideas anyone?
User 'danstah' raised the same query about a year ago. He solved it by replacing the motor. HK can you help me with this? Motor is fine on max power but keeps going into screech mode on other throttle settings.
I forgot to mention I had this motor in the same plane as you with 14x8 prop and 5s 3700ma plenty of power but did not last very long, you have to try to push the magnets toward the outside and you might find some lose one. good luck.
Thanks Coyote-60. I doctored the motor housing on the plane to accept a BL-4020 motor I had lying around. I shall do as you say and check all magnets thoroughly. I shall also double check the bearings because the one at the back looks like it may have more play in it than I first thought. Shame, seems like it could have been a good motor.
This is a 12 teeth stator 14 magnets motor. Quite small gaps between magnets increase the magnetic density and max efficiency. AXI motors also have little gap between magnets and minimum gap between magnets and stator. This increase motor torque. These motors are "hard" to turn.
In a different way, NTN 35-48, is a 10 magnets, 12 teeth stator. Magnets get much more apart from each other (big empty gaps between magnetics) and motor tends to be less efficient.
Any electrical engineer could discuss this pls?
Well it's something like that. The more magnets, the more torque and a lower kv. It's simple physics, like a V12 vs. a V6. It has twice as many firing strokes per turn of the crank. Hence more torque. Putting the magnets further apart requires that the can move farther between magnets, hence more RPM, or higher kv. The magnets falling off only means one thing! They didn't glue them well enough! I will not buy a motor that self-destructs! I have never had that problem with other Turnigy motors, like the gold and red ones.
i need a bit of help.. if i was to put this in a cap 232 70amp esc opto with separate rx battery.flying it acrobatically (half throttle Plus) how many mah would i need to get 6min flights... 2x 3s 3300...4000 5000?
It depends on the size of prop and average throttle used to determine the average amp draw. I estimate you might use on average 40A on a 6s lipo. A 5000mah (5Ah) will produce 5 amps for one hour. You can safely use 60-70% of the capacity. So, to figure the flight time you will get on a 5000mah: take the total capacity 5Ah x .7 = 3.5Ah, then divide the avg amp draw 40A by 3.5=11.4 , then divide one hour by 11.4 (60/11.4)=5.3 minutes of flight time at the constant amp draw rate of 40A. The 6s 5000mah battery should be good enough.
does this motor really go up to a 16x8 the #s are off from what I can see since the motor only rated for 60 amps to fly my ext-edge 540 I need to be at 1300- 1400 watts and I would need a 16x8/6 to do to alsome 3d hope you guys can help... jason
ive got the motor in the 1600mm dago red p51d on a 16x10 3 blade master airscrew prop, 4 cell zippy 5000mah, and im getting 1000 watts at 60 amps and the plane all up is 3.75kg in weight and love it plane does over 120kmph. hope that helps
Can the shaft on this motor be reversed? pushed through to the other side?
Also sorry about putting my question in the wrong place at first, accidentally put my question in a reply, new to the discussion threads here.
I ordered the motor and the accessory pack, when it arrived I discovered the ability to mount the prop on either side without reversing the shaft. Motor is running great in the Katana 50E. Thank you for the response though.
Please do not mix up deliver and consume. Deliver means delivered to the prop. Consume means provided by the ESC. No motor has any limit on the consume side. If you block a motor (hard or by a large prop) and increase throttle the ESC delivers all current the battery is able to provide. The limit is given only by the resistances of the wires (inside and outside the motor) and the transistors. However, doing so will cause excessive heat development and finally destroys the motor or the ESC.
The size of the prop vs the size and kv of motor is all you need. Run everything just under the max Amps, motor. ESC, and LIPO. Simple, just need a good watt meter and test before and after build. Make sure you use a temperature gun, Cooling is the last important thing! Cool air in, hot air out. This is the only way! Or sizzle sizzle!!!
hello, did anyone had alook at the graphics? it seems they are wrong as the 6S for example is not showing the expecter power use but something like 4S? any idea? I'm always selecting the motors on efficeincy chart. If they wrong, what to select. Thanks
Did really good on the maiden flight, very responsive with the Turnigy Dlux ESC and Gens 25c 6S 5500. Unfortunately it failed on take-off of 2nd flight, was able to go around and land the Falcon unharmed, just a needed the gear straightended a small amount. Before I took a moment to open the motor, chunks of magnet were visible in the vents, and gouge milled the stator hub. Inside the rotor can, none of the magnets were no longer secure/spaced and now bunched together. The center armature coils were scrubbed and magnet chunks sliced into the 3 phase leads. Got hot enough to melt the X motor mount and firewall itself, took about 10 seconds including dead stick landing. Not sure what happened.
Just got too hot on big prop! When you add a blade, (2-3, 3-4 etc.) cut back one size on diameter, or pitch. Need heavy duty cooling in and around motors if your going to push them to the limit. Also bench motor with prop you pick for a few batteries on 1/4 power for a few batteries. Helps cure the glue on magnets break in bearings. Best to find problems here. Do some full throttle run-ups for a few minutes or so while holding a temp gauge on it.
I Wish this motor with a little higher kv.
Then on 4 S or maybe 5S, shout be a perfect motor on a 1,5 m Katana with a 14X7 prop.
Ik hoop dat deze motor nog eens gemaakt wordt met een hogere KV, zoiets als 700 kv of 800kv. Dan is deze goed toepasbaar met een 4S of 5S pakket. Zonder er al te grootte props op te hoeven zetten.
Inderdaad, maar als je al een aantal 4 S pakketten hebt? En tweede stel je koopt een stel nieuwe LiPo's dan is een 5 S met dezelfde capaciteit toch goedkoper dan 1 van 7 S, en ook lichter.
Maar goed ik verwacht nog wel een andere NTM prop drive 4258 met hogere Kv, kan ik ondertussen de Katana gaan bouwen.
fait des essais statique..il tire plus fort qu un sk avec environ 15pcntde conso en moins..n est pas de chiffre pour le moment..mais mlgre qq grammes plus lourd que sk3 il ont une meilleurs qualiteintrinseque..rendement meilleurs aussi..recommander pour 3D jusqu a 2.6gk
Very good motor.
Hard material use.
The motor is in balance.
Tested with 7s 14" x 10 3-blades.
- Rpm 9500
- 55 ampere
- 1430 watt
- Motor little bit warm.
I use a slowdown gear 1:5 for my V22 Osprey.
25" 3-blade Rotor with pitch.
LiftPower ==> 2 x 8KG.
It came in a simple bag. Got it as a freebie and not tested yet. I'm sure it works all that stated QC nad so. Comes with I think is 4mm connectors. Real weight is 321,3 gram.
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Sehr gute Materialqualität, aber miserable Verarbeitung. Nach dem ersten Flug sämtliche Magnete gelöst, Motor gottseidank im Segler geblieben. Ich kann jedem nur empfehlen, vor dem Einbau alle Magnete nachzukleben, es lohnt sich