Hoverthings Multicopter Motor 900kv for 4S
We have developed these NEW motors 170w motors specifically for multicopters with 20AWG silicon wires right from the core windings. Multicopters control their flight by rapidly changing RPM every few milli-seconds – so the Hoverthing motor is light weight LOW-Inertia motor – and uses a light weight prop and prop adapter. These NEW Hoverthings Motors are custom wound with 26 turns of copper packed in tight to give a kva of 900ka. This makes them work on 3S 12.4v using a 1045 slow fly prop ; or VERY WELL on 4S 15.4v using a 9050 triple blade or the 0845 2 blade props. Importantly – We also specified NMB miniature metric bearings for long lasting flight Ops (after many similar HK motos failed on us after a few short flights).
- True 170w motor made for our Witepspy Multicopters
- Superior windings 26T, 900kva for 4S 0950 or 4S 0845 – LiPo Ops
- Full 20AWG multicore wires
- Superior NMB bearings – Made in USA
- Light weight – LOW Inertia – faster RPM changes
- Designed for VIC20 engine mounts
- 5mm prop shaft (up to 12mm thick prop) / 8mm nut
- 16.5mm and 19mm mounting holes M3 bolts – 3.5mm bevel supplied
- Motor X-Mount supplied for 33mm hole s- Co-axial Y6
- Works at Low/Medium/HIgh timing with HobbyWing 18Amp(tricopter) or Hobbywing 10Amp ESC’s (Hexii) (aka Turnigy Plush) ESC
- 28D x 32h -see photo at right
- 16.5mm and 19mm mounting holes
- Color – now all Black
Power Tests & Recommended Props:
- No-load Current (Medium timing) – 3S 0.48Amp – 4S 0.64Amp
- internal resistance 0.15Ohms
- 26T 12Stator/14magnets
- 4S 0950 triple prop – 1/2 throttle 3.0Amps ; WOT 10.5Ap, 162Wp, 15.2Vmin (1800 4S 40C LiPo -Plush ESC)
- 4S 0845 prop – 1/2 throttle 3.0Amps ; WOT 10.7Ap, 170Wp, 15.2Vmin (1800 4S 40C LiPo -Plush ESC)
- 1 x witespy Motor with 330mm wires ; 1 Prop-adapters 3.17mm/5mm ; 1 X-Mounts ; 4 x M3 flathead screwsRequires:
Setup & Maintenance:
- This is not a toy – Aviation requires discipline, inspection and risk analysis – Multicopter motors form part of the critical aircraft flight system and become your duty of care when purchased
- If a motor fails the Copter can fall from the sky and cause harm to person or property below – Always do a full pre-flight inspection on the motors ; A post flight temperature check for thermal stress (hot motor)
- Schedule of maintenance you must perform includes : –
- Remove and add Blue Loctite® to the shaft grub screw
- Ensure the Circlip is set (crimped) correctly to hold the shaft in place – inspect closely for any sign of looseness
- Carefully apply 1 small drop of OIL to each bearing every 5 hours flight time – with a syringe & needle (new SAE20-50 motor oil) – allow the oil to soak in for 1 min; wipe away all excess oil
- Avoid all dusty Landing/Takeoff zones – We recommend Ops from a dust-free rooftop LZ on a 4WD/SUV vehicle or a 1.5m circular plywood dust-free Helipad on the ground to prevent any dust ingress to the bearings. Abrasive dust entering bearings will shorten the effective life dramatically – inspect the bearngs for wear and replace if worn -Spin the motor – Magnetic cogging will slow and stop the motor which is normal – check for any wear or abnormal sound/roughness/dryness or non-linear friction indicating a bearing failure.
- Use high pressure air (can of comressed air – or air line) to clean any sand,dust, grass or dirt away from an engine after every flight
- Inspect the wires to ensure the insulation is in-tact
- Check that the collect (Prop-adapter) is tight and cannot be pulled off with 2kg force – Dont assume it’s tight – check it in Pre-flight
- Use Blue Loctite® to mount the engine screws to the carbon/G10 engine holder. Check the engine mounting screws never penetrate too far into the engine & short the winding wires
- Inspect the prop for any fatigue cracks or white stress lines – immediately repalce any prop suspected of weakness – Routinely replace props every 10 flight hours.
- Shaft must be replaced if bent – using a 3mm punch and tapped out – or shaft can be reversed by removing the grub screw and using a bench vise to push it further in and out the other side – then retighten the grub screw
if the motor is observed to be showing some initial warning sign – AN INDICATOR – noted by the pilot but not considered to be a risk by the pilot – and he decided to continue flight ; consider fully the RISK ; this can cause subsequent engine failure and total loss of your aircraft if it has less than six engines. Be aware –the most common causes of engine failure are
it’s VITAL to monitor the temps of all engines on the post-flight check, avoid operations where FOD. dust is a risk and keep motors padded in transport. It is also recommend to ground the aircraft and 100% locate the cause of any abnormal performance item.
- ingestion of FOD (foreign object damage) dirt, dust, stones or debris which can enter the motor during take off and landing – causing trauma (cuts) to the windings or insulation of the windings, damage to bearings
- breakage of one or more of the internal lead-in stator winding wires by stress (pulling of the wires during ground handling or assembly) – can be caused in incorrectly handling a motor, crash impact tension, carry the craft by gripping the motor assembly wires causing a break inside a motor.
- magnetic variation – de-magnetising of one or more magnets by placing the magnets on or against other motors/magnets or in magnetic fields – tapping against metal objects of the can of the motor – this partial de-magnetisation can cause the ESC to overheat the engine because the timing cannot be accurately determined by the ESC. Thermal run-away – engine overheats because it is effectively overloaded – Copter is too heavy. Overheated magnets are permanently ruined.
- dry-joints or inconsistent loose push-connections/soldering between an ESC and a motor leading to timing faults – especially relevant for long wiring runs – USE solder paste – use a Digital Multimeter DMM to check all 3 wires show the same Resistance in ohms
- Shorting of any motor wire(s) internally to the metal/carbon booms or too the airframe– INSULATION of ALL WIRES annd joints is vital. – short of the insulation from sharp carbon edges not filed smooth during construction – leading to timing problems or stuttering – Should you observe ANY motor hesitation or stutter – DO NOT FLY – replace the motor /wires/ESC as applicable to the fault – Beginner fault to observe AN INDICATOR – such as hestition then continue to fly leading to failure and a crash – Pro-Pilots discontinue flight at the slightest hint of a problem – because they realise that warnings are only given once.
- Poor bearing maintenance lubrication and/or exposure/ingress of abrasive dust leading to bearing breakdown
- NEVER fit the propellers to a motor until AFTER you have fully Tested and set-up the motor and YOU understand that electric motors can start suddenly without any warning. With proper understanding and maintenance the motors are safe.
- NEVER run a propeller without FIRST balancing it on a magnetic balancer
- Do a staic and a dynamic balance of all props for best results