Specifications

wires from the esc to the motor around (outer two ideally, leaving the centre wire alone). You will
need to use the same size pinion on both motors, and ensure the mesh is set correctly- use a
piece of paper between the spur and pinion as you mesh them together, to prevent them binding
too tightly. To get the best performance from a V-twin it is vital to use good batteries, this
generally means a pair of 3cell (3s) lipos. To ensure even discharging on each system, it is a nice
idea to use a parallel harness. It essentially is a pair of leads with male plugs at one end, and
female at the other, with a wire linking the negative wire on each lead, and the positive leads in
the same way. This ensures that the batteries discharge at the same rate, preventing the LVC
from kicking in on either system before the other- see below:
SYSTEM WIRING
PARALLEL HARNESS
Topspeed is around 55-60mph with good lipos and careful gearing, though it is important to keep
a close eye on motor, esc and battery temps.
15. BL system upgrades
E-Revo & Conversions
The faithful old HvMaxx systems are a nice intermediate upgrade, working well on both 12-
14cells and a pair of 2s lipos with an LVC device. The Hv6.5 motor is seen as the best version,
giving the best temps and good speeds of around 35-38mph. The Hv4.5 motor will give higher
speeds of around 43mph, but at the expense of higher motor and esc temps- be careful not to
thermal the esc as it can become permanently damaged. Next step up is to either buy an MMM
esc & 2200kv motor kit, or build a custom system basically, using either a MambaMaxPro
(MMPro) esc or the MMM esc and a Feigao-type L or XL can motor. The best motors to use would
be either the 9 or 10L to get good speed, and the 8XL or 9XL for good speed and more torque.
Using motors with fewer turns/higher KV rating (rpms per volt) will result in higher temps and
potential damage to the motor, esc and batteries. 100-180f is generally seen as the safe zone for
motors and escs, with 135f or below being optimum. There is an old rule of thumb regarding
temps which many will find handy no-doubt:
Hot motor + cool esc = under geared.
Cool motor + hot esc = over geared.
As a general rule this is fine, though it is possible to get different results depending on the esc
and motors used- some motors run hot regardless, and some escs are less capable than others
to deal with high current draw. It is important to choose a suitable sized and KV motor for MT
use- 36-39mm diameter, and 60-80mm in length is a good guide. The KV rating will depend on
your voltage, but as a general rule again:
2000-2700kv = 4s lipo/ 12-14 cells
1800-2200kv = 5s lipo/ 14-16 cells
1500-2000kv = 6s lipo/16-18 cells
If you are planning on using more than 6s lipo, chances are you don’t need to be reading this
FAQ…
Beyond that there are higher end escs such as the Quark 125b, MambaMonster (MMM), Kontronic
Jazz, Schulze, Hacker mastercar, MGM, and so on. Ideally, you want an esc that can handle upto
6s lipo or more, and is rated for atleast 120amps ideally.
High end motors tend to take the shape of Neu 1515 or larger models, Lehner 1940 and larger
models, Hacker C50maxx and Feigao XL models, and the Castle-Neu MMM motors, along with the
Medusa 60-80mm models, and Megamotor 22/45 series. There are numerous other good quality
motors these days that are suspiciously similar to the Neu & NeuCastle motors, such as the
offerings from Hobbywing & Leopard motors- good quality motors, but using lesser magnets than
the higher quality motors; exploded rotors & higher running temps are likely if you arent careful
with the gearing & kv/ size choice for your application. The Plettenberg BigMaxximum used to be
concidered the very best of the best, but these days this 4 pole German monster is very
overpriced & has a kv rating much too high for use with anything other than 4s lipo- does not
make for a very efficient setup at all.