In addition to the rowing mechanism, I need to install the battery, receiver, paddling electronics and rudder servo.
For the battery, I decided to use 5 NiMh cells rated at 3300mAh. The decision was based on several factors.
1. Experience with the rowing boat where I've used 4 cells rated at 3700mAh. The rowing boat had 9 servos plus a 'transistor radio' and a smoke generator for Ben's pipe. The battery typically gives an hour or so rowing time, more if Ben doesn't light his pipe!🤣. The kayak has 3 servos plus the drive motor (a modified servo) so the selected battery should give plenty of duration.
2. The kayak needs some ballast and I prefer to use larger cells for this, rather than having to add dead weight.
3. The selected cells will fit under the paddler (just!)
The position of the battery under the paddler brings the centre of gravity of the kayak to a position just behind the location of the paddle which I think is where it should be. I may need to add some more ballast to balance everything up once the build is complete.
The receiver and paddle electronics are fitted into a plastic box (shown without it's lid) which sits just behind the paddler and battery.
The rudder servo is mounted behind the receiver. Both the receiver and the servo can be accessed through the rear hatch.
If you look carefully at the differences between photos 4 and 5 you will notice one of my 'mistakes'. Having glued the servo mount in the position shown in photo 4, I realized that I couldn't access the rear fixing screw through the hatch opening. The mount was carefully cut free and repositioned as shown in photo 5. Glad I spotted the issue at this stage rather than later.