Carbon Fibre Genesis 900 (Assembly Instructions)

TFL Genesis

TFL Genesis

My first RC boat was a fibre glass Genesis purchased from hobby king. These hulls come prebuilt and you simply drop in your own electronics such as a speed controller, motor, batteries and radio gear. Over the following weeks, I found myself on the hunt for more and more speed. In order to achieve my goals, I found myself completing modifications to the hull. These included upgrading the driveline, steering and battery mounts. After completing these mods successfully, I decided it was time to tackle my first scratch build of an RC boat.

Click on ‘Continue Reading’ below for the complete build log!

Having a soft spot for the genesis I decided that I would source a bare hull in carbon fibre and build a single motor setup with the goal of reaching a minimum of 100 kmph.

Primary Ingredients:

  • Genesis 900 Bare hull
  • TP 4060 1600Kv
  • RCBB 200amp ESC
  • 6S 45C Lipo
  • 3/16 Driveline

Ok, now you have a brief introduction to my project, lets get started!


The bare hull as it was received from TFL in China. The hull is carbon fibre with the top half having been gel coated in a pearl white.  It should be easier to see on the water with the white top!

Bare Hull

Drilling the holes in order to mount the rudder to the transom of the boat.  A fiddly job, especially if you like everything to be dead centre.

Rudder Placement

The backing plate cut from a piece of alloy, this will be used to secure the rudder onto the transom of the hull. Don’t forget to use a bit of silicone in order to stop water leaking into the hull.

Backing Plate

The rudder has been successfully installed on to the transom, it lines up dead centre or close enough anyway!

Rudder Installed

Mounting the strut onto the rudder mount, the strut was sourced from RC Boat Bitz (RCBB). It is custom made to accept a 7mm or 3/16 copper stuffing tube. The one-piece flex shaft can be inserted from the rear and easily removed for maintenance. The dual water inlet was also sourced from RCBB, the mounting plate fits perfectly onto the transom.

Strut + Water Inlets

An offset rudder mount sourced from RC Boat Bitz, information around the internet suggests that this should help provide stability at high speeds.

Offset Rudder

Carbon fibre motor mount being positioned in the centre of the hull, this will be epoxied down once in the correct position. Note that this motor mount has a t-bar which helps secure the drive line into place.

Motor Mount

A picture of the progress so far, time to start mounting the battery trays and the 3/16 drive line.


Water outlets have been drilled into the sides of the hull. I have use the larger diameter outlets to make the water tubing.

Water Outlets

In order to secure the batteries into the hull, I have used 50mm wide pieces of alloy and glued into place two copper bars. This will lift the battery off the floor to allow for velcro straps to be passed under the mount to secure the battery down. In the event of the hull taking on small amounts of water this should help keeping the batteries dry. Once the glue has set, I will pop rivet the mount together.

Battery Mounts

The final result of the custom made battery mounts, you can see I have pop riveted them together.

Mounts Complete

Glued into the hull, a little more forward than the stock position of the factory built Genesis.

Progress Shot!

Installing the motor now makes it easier to line up the driveline. This motor is a TP 4060 1600kv.

Motor Alignment

Self-explanatory, drill a 8mm hole into the centre of the hull in-line with where the stuffing tube will pass thru the hull.

Driveline Hole

I don’t like the copper tubing that is provided by TFL, instead I sourced 9/32 copper tubing from my local hobby store. It has a thicker wall and it still easy to bend into shape. The easiest way to bend the copper tube is to heat it up on a gas stove top until the copper is glowing red, and then slowly bend into place. To hold the tube whilst you are heating it up, insert a screw driver into each end.

Stuffing Tube

Easy to use expoxy putter to secure the tube in place and to make the hull water tight. The putty sets within about 30 minutes, so you have plenty of time to mould it into shape. It is also water proof.

Expoxy Putty

3/16 one peive flex table, 9/32 copper tubing, 48mm 1.4 pitch alloy prop.

Driveline Complete

Custom servo mount sourced from RC Boat Bitz.

Servo Mount

Large diameter water tubing with anti-kink spring.

Water Tubing