KeilKraft Mermaid

[ashley needhamParticipant @ashleyneedham69188]

….as I previously stated, ditch the coupling. There must be others small enough out there..

Ashley

[redpmgParticipant @redpmg]

Carl you can buy grub screws that require an Allen Key – they can be tightened up much more than using a screwdriver. Replaced all of mine – 3mm but you can also get 2mm if needed – mine were sourced from the Meccano Man and off flea bay as my friend calls it but sure there are plenty of other sources in the UK .Seem to recall SHG carried them – but they are now solely on Ebay after partial retirement.

[carl brothertonParticipant @carlbrotherton75833]

The model has now been pretty much completed.

The TX has been bound, the motor checked for direction of rotation. Failsafe set to power off.

The model placed in a basin and the level observed. It seems to float ok. The upper point of the spray level is below water surprisingly. Given the low weight of the motor used when compared to a 400/480 brushed motor.

The motor was run at full power, the thrust did not seem earth shattering. The motor just appearing to be turbine, or is that electric motor smooth. A good swell of water was observed, definitely not a rooster type tail.

I was surprised, that the set screws do seem to be adequate in transmitting the power input.

I now need to measure the amps and watts consumed. I guess this needs to be done in water? Any views.

[Dave Cooper 6Participant @davecooper6]

Carl

Without trawling back through the whole thread, I can't remember if you've fitted a fuse ?

If not, it's generally regarded as good practice to fit one. With a multi-meter you can check how much current the motor is drawing – make two checks unloaded and loaded (in water).

Watts = volts x amps, this will give a rough figure to work with as battery voltage can vary. As an example, my 16" RAF launch with a 385 motor runs quite happily with a 2 amp car-type fuse.

Regards,

Dave C

[Ray Wood 3Participant @raywood3]

Hi Carl,

No real suprise you don't have much thrust if you still have that little 3 blade plastic scale prop on the shaft ?

The comparison would be a Ferrari engine connected to an egg whisk, the power train your using would quite happily power a 24" boat, and its hard to find space to fit everything in a 14" hull.

Regards Ray

[carl brothertonParticipant @carlbrotherton75833]

I have a watt meter, the only issue is that it is not set up for RST plugs, which have a rather limited amp rating. It is set up now for XT60 and Deans type (now called "T" type I think).

I am now starting a JIF 65 (yacht) and starting to think about how to power and finish my Crusader , which I think is about 24" long.

I need to run the Mermaid to learn about boats and particularly electriics, need the loc down to end.

 

Edited By carl brotherton on 25/02/2021 17:14:21

[Author]

Posts