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 engineers check and balance each motor before shipping to the HobbyKing.com warehouse.
hi guys, i have a stick 1500 with: - 70 Amp opto Esc with 5Amp external ubec* - HXT 6.9kg / 39.2g / .16sec Twin bearing servo* - FrSky DJT 2.4Ghz Combo Pack for JR w/ Telemetry Module & V8FR-II RX* - Turnigy 9XR Transmitter Mode 2 with Turnigy 9XR Safety Protected 11.1v (3s) 2200mAh 1.5C Transmitter Pack* but i dont have motor, i saw this: -NTM 42-38 750 Kv/ 785W* -NTM 42-48 650 Kv/ 1295W what is the best motor for my plane, propeller and batery pack?? reguards
This discussion is superficial:
What is meant by "best performance"? Max. power output, max. efficiency? And what is the preferred speed of the airplane? As far as I know the props pitch should be chosen so that the "pitch speed" is about double the true air speed for max. efficiency of the prop.
Exampe: With the NTM Prop Drive Series 42-38 750kv and 4s lipo you get about 11000 idle rpm, or about 9000 load rpm, which is 150/s. The "pitch speed" of the 13x8 prop is therefore 150/s x 8 x 0.0254 m = 30.48 m/s. The aircraft should have a full power airspeed of about 15 m/s = 54 km/h. For faster plane you need a prop with more pitch or higher rpm.
Anyone can tell me if i can use this engine in a 7.7 pound plane? and which battery and propeller should i use with it. It's for a 10 to 15 minutes flight. the city i'm in it's at 8450 ft high and i don't know how much the height will affect the thrust.
well first off what kind of plane you have, as a rule it goes as follows, trainer you need 60-100 watts per pound, sport 100-150 WPP, 3D 150-250 WPP, edf 200 this is to achieve the best performance, so, according to the specs you have a max of close to 800 watts which will be good for a 8lbs trainer, 5lbs sport, 4 lbs 3d and 4lbs or less edf. Always flight times will be based on your throttle management. As for the height of your city the effect will be minimal cuz you are using an electric not a internal combustion aircraft, hope helps.
I'm building an octa multicopter and have purchased 8 pcs of the NTM-4238 motor, Now I'm looking for the recommended props 14x6 CW/CCW but these seems to be hard to find anywhere. I've found 14x7 carbon props, does anyone have some idea if that size will be usable. I have the Turnigy D-Lux 55A ESC to go with the motors.
Hi guys , I went with this motor on my epo mx2 1400mm plane and I am running a 13x8 prop with a 70amp esc , the same prop with the last motor etc , with this set up it is making my batteries hot and melted a 4s 3600mah !! Any ideas ?? I put a 11x7E on it just then but it is not good enough it wont even hover in my hand holding it !! I got problems ... Thanks Mick
Why don't the have a proper comparison between 3s and 4s? Prop it until it is pulling the same current and then show the thrust comparison, that makes infinitely more sense than running it at 60% capacity vs. 100%...
Hi everyone, I saw that someone has already posted my question before, but anyway, I would ask again you all, I m just for order the wing X8 (2 meter) that will carry a payload (total) about 2.5 kg max, Do you guys recommend me to order this motor ? just for FPV measuring.
Please someone can help me ? regards.
I am planning on installing this on a 6-7# plane (Avistar Elite ARF) and am wondering if this motor would work with a 11x7 APC prop? I have a Hobbyking 90-100 amp esc, and 5S 4000 mah Nanotech batt. Any help welcomed
This motor is rated for 4S Not the 5S you are asking about.
With a 4S the combination sounds perfect for a Avistar. Be careful about the CG and the correct Thrust Angles. Stock Prop. 11 x 7 is a good starting point
Jerry, also Check the grub screws and make sure they are tight, the shaft could be slipping under load, also double check the magnets are still in place, they do come loose or break away from the glue. Mine did.
A guy at my field gave me an old Cloud Dancer balsa plane, I'm converting it into a P-51d, lots of work. I want to stick with 4s batteries, plane should weigh around 3 to 3.5 lb, or 1.58 kg. Do you think a 3 blade 13/6 should work? I live at 8500 ft, in the mountains in the U.S. plane has a 61in wing span. any ideas or parts you would use is helpful.
BlackRose* as long as your batteries are over 25c (discharge rate) a 3-blade 13-6 will work for that plane. Do not forget to factor battery weight in your final plane wing load..it is a common mistake (so your plane in flight is around 4.5 to 5# with battery).
Marco, all of my batteries are 40c, at 8500 feet my 53 inch trainer, balsa and ply lands dead stick around 40mph, very thin air, I'm looking to find someone that flies high, with experience at altitude,a 13/6 blade might get it off the ground, i'm not sure, hence my question. Some times we fly at 10,000 ft. really fast!
Black Rose* try a two blade 13-8 and swap servos to minis (hitec's HS81 will do !! Torque is similar to standard size servos), use LiFe batts...two blade props are more eficient than 3 bladed ones..take advantage of winter's heavier air to do some test flights. I fly (US and Osterreich) at 6400 Ft..not quiet as high but similar issues).
Marco, keep trying, you'll get the credit yet! I don't know what servos have to do with it, but I use standard servos, a lot more power than Hi Tech HS-81. This estimated weight is including all flight equipment, and two blade props are good for speed but at high altitude, three blades give better thrust. Thin air needs more thrust. I guess what I need is a thrust calculator that would compensate for the air up here, I'm probably out of luck trying to get a fair answer.
I plan to run this motor on 3600, 30c, 3 cell Turnigy lipos. It is going into a 63 inch span (4 lbs rtf) Multiplex Mentor foamy. This is used for aerotowing and general sport flying. I would like advice on the best apc prop for thrust at reasonable airspeed, say 55 mph. I would like to prop for around 42 amps but note the quoted max watts for 3 cell is 403, divide by 12 volts equals only 33 amps. The 4 cell max watt quoted is 785 divide by 15 is 52 amps.
Is this correct that the motor can run more amps at 4 cells than on 3 cells?
I believe that the use at Monolog 70(weight 2.5kg)
I think the propeller of 15 ×* 8,14 ×* 10.
Very impressed with this motor. Very well made and no slop or bearing noise to speak of. I've installed it into a CMP cessna 182 weight approx. 2.7kg. Running on 4S2P 2650mah 20C Flightmax, Otter 55A ESC using a 3 blade 12x8 APC prop (no thrust measures as yet but I would guess approx. 2.5kg of pull). The following is a reading using fully charged packs for about 30secs. I will update the review after my first flight.
Great motor at a great price. You must buy the accessory pack as I tried fitting another prop adapter to it but they are completely different to the SK series motors.
Awesome quality for the Price...Used it on my .40 class Piper Cub (Balsa) lots of power stays cool!
No comments. Reply..
Im using this motor with a HobbyKing 60A ESC, and a 12x6 2 bladed prop with power coming from Turnigy 20c 3300 lipo. I have it mounted on a Hangar 9 Cessna 40 and although it does fly, it certanly struggles to get off the ground and is not very fast in the air. After 7 minutes of flying time the battery is very warm.
6 comments. Reply..
I am very satisfied with this motor. I have installed it in a scratch built,68" span Ryan Navion. The motor is spinning a 13x8" prop on 4 cells. Plenty of power. I am using a 60 amp esc. This is a great value from Hobbyking. Motor runs very smoothly and is quiet. I plan to buy another. Quality is outstanding.
2 comments. Reply..
Yes, not so bad! The quality is really good, no any magnet was loose.
Weight of motor is 205g with the accessories.