Recent BRCA ruling now recognises three forms of power for
running a Mardave / GT12 car –
4cell/G2, 1s LiPo/13.5t brushless
or 2s LiPo/21.5t brushless.
4-CELL/G2:
This is a very easy system for a
beginner to use - components are
cheap and reliable and there is a
wide variety available. However, it
is not so suitable for top end competition because getting the very
best out of a motor and cell is extremely time consuming, expensive
and difcult.
For this system, only the Mardave
G2 motor is eligible, speedos
must retail for under £65 and have
reverse but there is free choice of
cells. The CE kits come with a battery tray that is perfect for the 4-cell
packs.
1S LIPO / 13.5T
BRUSHLESS:
Slightly more powerful than the
4-cell/G2 system, zero maintenance and the most popular system for top end club and National
racing. However, the low voltages
of the 1s LiPo packs mean that
speedo choice is tricky – only a few
(expensive) speedos work properly,
and cheaper ones will need an additional voltage booster installed.
Speedos do not need reverse.
The most popular speedos are:
1. HobbyWing 1s: install the
508 version of the software for
full ‘blinky’ mode. This speedo is
slightly larger than the other speedos below, but it is the cheapest at
about £110 in the UK (or £70 from
Hong Kong).
2. LRP SXX Stock Spec: probably the most expensive of the
three (around £175 UK price)
but comes with the best warranty
and manufacturer backup too. If
possible, get the Version 2 unit
as some software versions on the
Version 1 units can be less reliable than others.
3. Nosram Pearl Version 2: essentially the same as the SXX V2,
but in a red box rather than a blue
one. Don’t get the V1 units as
these don’t have 1s LiPo capabil-
ity. New cost is usually around
£150.
4. Fusion Exceed: comes with a
perfectly good motor for £95 but
will need a voltage booster tted.
Not eligible for National racing as
it has no ‘blinky’ mode.
Motors can be any 13.5t from the
BRCA EB list (there is no restric-
tion of price any more). Popular
choices are the HPI Flux, Fusion
Exceed, Team Powers Plutonium.
The lexan battery tray that comes
in the kit will take most varieties of
1s LiPo cell and offers a degree of
extra protection too. Mounting the
cells in the designated place will
give a reasonable balance and
setup for medium to high speed
tracks.
Another option is to use ‘Cobra’
battery boxes to hold LiPo cells
and to mount them lengthways
(slightly to the left) down the chassis rather than across it. This will
get the weight closer to the centre
line of the chassis and is generally
better for faster changes of direc-
tion and faster, atter cornering. If
you choose to do this you should
position the cell, speedo, servo
and receiver very carefully to help
counterbalance the off-set weight
of the motor.
2S / 21.5T
BRUSHLESS
A new idea but extensive testing
has proved it to be very close to
the 13.5t / 1s setup, with none of
the low voltage problems. The
BRCA support this setup for club
racing but is not recognized at
National level.
For cells there are 3 main
choices:
1. Hard-cased, mini LiPo packs
used in the micro off-road buggy
classes. Small, very light but
still enough punch and capacity
to last an 8 min race. There are
battery trays available from Mardave that house these perfectly.
2. New 1s/2s packs for GT10
cars (Intellect CC2S3200V7 or
Yokomo YB-P228BE). Same
physical size as a standard 1s
pack (so t the standard cell
holders) but are internally wired
to give 7.4v.
3. “Shorty” packs used for
1/10 buggies. Taller than the
1s/2s packs (25mm compared
to 18mm) and are signicantly
heavier too. However, they offer
faster re-charge times between
races
For speedos and motors try
a HobbyWing “Just Stock” or
SpeedPassion Citrix or Reventon
“S” speedo and any 21.5t motor
that has a xed endbell (HobbyWing Stock, SpeedPassion V2 or
V3 Ultra Sportsman etc).
5. POWER: CELLS, SPEEDOS AND MOTORS