main vehicle chassis is a simple to build glued and screwed timber
construction. Ground clearance is fairly limited at roughly 50 mm (2") -
so the design is intended primarily for running on good drive surfaces
and not for off-road use. Should be okay on smooth (mown) grass
In use the kart will need
to be fitted with a strong karting style bucket seat to ensure the
driver is supported properly and the seat would be securely fixed to the
main chassis longerons. Seat belt attachments will also need to be fixed
securely to the main structural elements of the chassis towards the rear
of the seat.
A 36V reversing controller
will suit the design. The combined rated current draw of the two 750W
motors will be around 50 Amps, this will peak at over 100 Amps during
hard acceleration so a 100+ Amp 36V controller is probably required.
Assuming an average current draw of roughly half the rated current of
the motors the 3 x 12V 40 AmpH batteries should give roughly 1.5 hours
continuous use between charges (load and driving style
Some more images of the design -
- the motor drive arrangement (some structure removed for clarity). I
thought it would be interesting to experiment with taper-lock
compression fittings here. The rear axle drive sprocket and brake disc
are mounted on a compression fitting "hub" made up from a heavy chain
sprocket and taper-lock bushing. The Taper Lock bush has a torque
capacity roughly 4-5 times the rated drive torque through the axle so it
should hold well and also be easy to fit on keyless shafting.
The axles are supported in
needle roller bearings housed in the timber chassis structure.
Right- a view on the core elements of the kart (seat and
covers removed). As you can see the basic design is fairly simple and
has scope for individual customisation - eg steering wheel choice,
seating and choice of colours. Covers will be required to keep curious
fingers out of the chain drive area.
As always with electric drives care should be taken when
working at and around the hot motors.
Batteries should be securely strapped down to the
As I mentioned I haven't
yet found the time to build and test the design. It looks to me as if it
should work though - I'll keep you posted.