Mugi - Shop - JP PRO 400 Electric Motor

A three pole armature carbon brushed electric motor spinning in two oilite type plain bearings, electrically supressed with two external 10nF capacitors, each brush to case. Voltage range 3.8V~8.4V with unloaded rpm of 17,000 and an efficiency quoted at 78%

Weight 72g bare and 76g including our red and black 200mm multi-strand leads we provide. Solder quickly tinning both the tags and wire lead ends. Ensure the the plastic insulation around motor terminals is unaffected - use needle nose pliers on the tags as a heat shunt. In use observe polarity; red blob indicates the +ve terminal.

Motor measures 46mm long overall, 28mm diameter and a 2.3mm shaft projecting 13mm from one end. Fixing can use the pair of threaded end holes. Alternatively simply strap on with tight electrical ties as we do on the Mugi Evo.

Requires a power switch but a suitable solid state speed controller (for brushed motors) is better. Use with NiCad or NiMH battery packs up to ten cells. Avoid the 7-cell trap as the performance will be feeble. Beyond ten cells may reduce service life due to internal heating of the coils and armature solder, so ensure good cooling. Keep the bearings well oiled in use, in emergency use your vehicle dipstick end to lubricate. Keep an adequate airflow through the casing and align the side cooling slots vertically.

Use on the Mugi Evo with the Gunther propellors which are a push-on fit or use our adaptor/spinner and the Microspeed plastic or carbon fibre propellers. All these propeller types are pictured above. Launching an Evo from ground level with the assistance of a tethered elastic is highly recommended. It rapidly achieves flying speed with the advantage of initial ground effect stability.

Note: The motor will benefit from ventilated running-in prior to use. The benefit is not only for the bearings but primarily to the individual brush contours/commutator fit. Tests have shown the current consumption gradually increases as the brushes bed-in, in one instance going from 6A to 8A for this JR PRO motor. The power increase is quite evident and shows as improved rpm to the propeller. A school of thought (from the old car racing days) advocates running the motors immersed in a bucket full of water. We have never tried this, fearing thermal runaway of the ESC but it is one technique. On the bench, with some basic instrument monitoring has been our method. Using old NiCad six and (even the dreaded) seven cell packs is usual; swopping them around with breaks for cooling. Eventually run with the eight cell packs which are easily soldered up using a hot iron and clean copper braid (from TV coaxial cable). If you read the Reviews section and Silvain's posting, he us braver than us and runs this size of motor on a three cell LiPo. Pete did the same for model testing! We check these motors with a brief test burst before shipping.

Code	Description	Price	Add to basket
JR400	JR PRO 400 motor	£4.59