Hi Shipmates,
Having a few days off work has enabled me to play.

I cut back the prop shafts as I wanted to at a collet around the flexi shaft, you may wonder why, well if the coupling fails for what ever reason it will stop you losing your flexi shaft and propeller.

I painted the hull a lime green, added the water cooling hoses in blue, drilled the transom for the rudder linkage bellows and drilled holes for 4 water outlets two per side of the boat, then connected up all hoses.

Soldered connectors on the two ESCs and tested motors and ESCs, (note disconnect positive + of one of the ESCs stops both BECs powering the system.)

Kind regards
Roy

Hi shipmates,

Servos
A change of heart with the single 20kg/cm servo the arm is large and needs an extension, thus even a 20kg will have a much reduced torque at a distance of around 6cm.
By doubling the distance of the servo arm, we’ve halved the torque
Force = Torque of servo (20kg at 1cm) / distance in cm
20kg at 1cm
10kg at 2cm
3.33kg at 6cm this may not be adequate for two 4in rudders (part submerged)

Thus I may revert to two 20kg servos instead of one that is over reaching.

Dual brushless
Dual brushless motor control is can be a problem even if using same 2x motors and 2xESCs, a 'Y' cable was not the answer for me, and one motor started turning before the other and hence run faster.

I had to scrap that idea, and the answer was to use a more complex radio gear, a transmitter with built-in mixer(s)
I had a spare 'Flysky' i6 and the following video showed me how to set it up.
note. the offset shown in the video varies considerably between setups mine was 4, his was44.

Hi Shipmates,

Replaced a bolt in the rudders with a plastic bolt this is a deliberate weak point, in-case the rudders hit a log or submerged item, thus allowing the rudders to lift up and not rip off the transom.

Added various stickers and a name of 'Catalyst'

Currently working on a secondary inner water proof hatch.
and touch up black portion of the boat.

Regards
Roy

Hi Shipmates,

I've added a internal cover that will be taped down, made of 1mm clear Perspex.

Put in the original receiver plastic box, now with a Flysky receiver and other cables in it.

Original hatch will also be taped down.

Regards
Roy

Hi Shipmates,

First run was successful, it could keep up with a racing mono, which looked expensive.

There was some problems:
The battery did not last long (singe 3300mah) which I think may be duff as when it arrived it had only 8v o/p this is a 14.8v battery so not good, I managed to charge it but it only lasted about 3 mins.

The boat leaked internally, due to leaking water jackets, this is because the motors are ribbed so I have sealed them with some epoxy resin at ether end of the jackets.

Next project is
A 29in Flying fish up grade.

Regards Roy