The Rotorgeeks 1407 continues the tradition of high performance, tough, serviceable motors. Originally designed in April 2016, the 1407 has undergone 4 major revisions in quest for the ultimate lightweight powerplant. The final version is a top performer in its category as well as the lightest, coming in at only 14g with locknut!
As with all Rotorgeeks motors, the 1407 is made from 7075-T6 aircraft grade aluminum, with almost 3 times the tensile strength of traditional 6063. The case design has been engineered for maximum strength and impact resistance. Shafts are secured into the rotor both mechanically and with a high strength adhesive to make shaft slippage and vertical play a thing of the past. No set screws are used (unlike Brother Hobby, X-Nova, DYS, RCX etc). The shaft is held in place at the base with a standard e-clip, making servicing and parts replacement easy.
Thrust charts will be posted shortly but keep in mind the limited value of static thrust tests as this size motor is usually current limited by the small batteries. Power combinations that burn up on the test bench work in real life without incident.
We’ve been running the 1407s in various configurations – it's a very flexible motor, typically running on 3-4S power with 3” and 4” props. We’ve run the 4000kv on 4S with props as high as the Dal 4045 V2. We’ve even run the 3200kv on 5x3. In most cases the battery is the limiting factor rather than the motor. All of our test machines have been running the very small and light Cicada 10A ESCs which can run DSHOT (up to 600) and handle 4S voltage. Alternately the Cicada 20A 4-in-1 ESC is a good choice for those that want to run their electronics in a stack.
No hollow shaft?
We prototyped with the trendy ‘hollow shaft’ design. It added weight in an area where there was no requirement for additional strength when using 7075-T6 Aluminum. A steel shaft also restricts the inner diameter of a stator, which is undesirable when designing a small, light motor. The only motivation we could find for a hollow shaft in this size motor was cost savings (the block of aluminum that the rotors are milled from can be substantially smaller without the height of the prop adapter on top).
Stator: 14mm wide X 7mm high
Stator slots / poles: 9/12
Winding: Single wire, hand wound, WYE termination
Weight: 13.5g with 3cm of motor wire + 0.6g aluminum flange locknut
Mounting: 12x12mm M2
Aluminum flange locknut (slight color difference on blue version...anodizing!)
4pcs M2x6 socket cap screws (accepts 1.5mm hex bit) – suitable for mounting on 3-4mm thick arms
4pc M2 washer (0.5mm thick, required for 2.5mm arms, optional for 3mm arm )