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Published Monday 29 September 2008
Categories: RC Models |

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Custom 5th Scale RC Bike Project

The development of a custom built 1/5 scale radio controlled electric motorbike using a carbon fibre chassis and adjustable pivot suspension unit.

The design was made using adobe Illustrator and the main parts were cut on a custom made CNC milling machine and other parts hand made or using a mini lathe. Custom Thunder Tiger Chassis

This was my first attempt at making a rc bike chassis using carbon fibre was for a Thunder Tiger Electric RC motorbike. The original frame panels were scanned and then traced in Adobe Illustrator. I then modified the layout of the panels to reduce weight and then exported them for cutting on our milling machine. The chassis is approx 75g lighter than the original alloy version but it is a lot stronger.

thunder tiger carbon frame [more]

Custom Bike Build.

The second project was a build from scratch bike project with a rocker arm system for the rear suspension. I purchased the wheels, gears, rear swinging arm and front forks but all other components were custom built. The first stage was to mockup the chassis and major components for the bike including the motor and suspension parts in 3D, this enabled us to work out the correct clearances for all the parts. The components were then exported to Illustrator and outline drawings made for exporting to the CNC software. The parts were then cutout using 2.5mm carbon fibre sheet and aluminium for the motor and suspension mounts and parts.

Initial panels bolted together with the forks reversed to show the steering mounts with prototype yokes in clear plastic.

custom rc bike 1

Lower suspension and swinging arm mount, this was cut from a piece of 22mm alloy bar.

lower suspension mount

Lower suspension mount fitted into the side panels

Lower suspension mount fitted

Rear swinging arm fitted onto suspension mount.

Rear swinging arm fitted

The alloy motor mount prior to the spacers being fitted and bolted into place.

alloy motor mount

Rear rocker arm mount with link arm connecting the swinging arm to the rocker arm.

Rear rocker arm mount

Side view of the frame with alloy yokes fitted and rear show attached to rocker arm.

Side view of the frame

Steering servo fitted

Steering servo installed

Left side of the bike with radio and electronics installed.

Left side of the bike

Right side of the bike with radio and electronics installed.

Right side of the bike

The bike was then fitted with a quick release battery mount using a 2.5mm carbon plate and alloy mounting brackets. The seat mounts are black nylon rod cut to shape on the lathe.

Left view

right view

top - side view

The overall width of the chassis excluding the motor is 24mm

Top view

The bike was fitted with a Novak 10.5 turn brushless motor and has been speed tested against a car at 48mph on the open road!

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