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[ian-mccaffrey]

my new finished project . the micro tug based on the revel fairplay tug kit  at only 7 inches !

[radiojoe]

Mwar Sweet.

[tugnut]

nice one      

[Martin (Admin)]

Me too, awesome!   

[ian-mccaffrey]

fully RC too . no rudders tho . its steered by the mixer in the hand set

[Allnightin]

What RC gear and motors are you using onboard?

[ian-mccaffrey]

using 2 standard servos chopped up to use for motors and the contoroll boards from them for esc's

[Neil]

Ian, could you explain to thicko's like me exactly what is in the box and how it works please........

I got the motors and the two boards from the servos stuck to the sides of the hull...........I see the pots ( in black that looK like switches) but how do they work from your radio.......and what is the circuit board between the two motors, could you explain in very simple things how they work as I would like to motorise an old Frogg Oakley class lifeboat I have at some stage as it is 1:48th, similar to my Calmac ferry............

but please simple terms.....ta.

[ian-mccaffrey]

Pots. When inside the servo turn with the gears and tells the brain where about the servo arm is
So basically you got to find the center point of the pot
Plug it in to the receiver with battery attached to it.  And turn it untill it stops. Then glue the moving bit of the pot. So it can never move again

And the circuit board you can see is just the receiver. With the case removed
Although I have now changed that to an orange rx one

[Neil]

so once the pot has been glued and it's circuit board is plugged in to the receiver it acts as a speed controller without the pot being turned....am I right??. also what voltage battery is coupled up to the motors and what voltage is placed up to the receiver???.............this sounds simpler than even I thought it could if that is the correct procedure.finally if the receiver is BEC would you only need one battery of 6 volts

cheers, Ian

[warspite]

I did something similar with my airfix landing craft  ,

Except I glued the motors partially through the hull and directly connected the kits props to the drive shafts, the pots have a cable reel attached to them as they protrude through the bulkhead in the loading bay and are partially adjustable (the glue did not stick too well). I did this so the model looks like the crew have something to reel ropes to, the battery is hidden under what looks like crates.

Still works even after being out of water for a while.

love it though, wish I could get any of my other projects on the go.

[ian-mccaffrey]

Pots. When inside the servo turn with the gears and tells the brain where about the servo arm is
So basically you got to find the center point of the pot
Plug it in to the receiver with battery attached to it.  And turn it untill it stops. Then glue the moving bit of the pot. So it can never move again

And the circuit board you can see is just the receiver. With the case removed
Although I have now changed that to an orange rx one

the receiver battery is 4.8v 1000mah ... and the battery at the front by the motors is just placed there to keep the motors in place whilst the glue sets for the motors lol
 and yes once plugged in to the receiver the servo bits act as a speed controller

[malcolmfrary]

That is one very neat installation. 
The servo boards give very good proportional control, albeit with a very small deadband.  With old type transmitters this could be put to good use by ignoring the stick, and using the trim slider as an engine room telegraph.  If you need that power but want a more conventional response, Actions Pico ESCs do the job, and are about the same size and weight.
What are the couplers?  I have mostly settled on the flint springs from disposable lighters as being highly available, and, with their tapered ends, a good fit on a range of shafts and especially good on the very short bit of shaft you get on a servo motor.

[Tug Fanatic]

Looks great 

What props will a standard servo motor drive?

[Neil]

the receiver battery is 4.8v 1000mah ... and the battery at the front by the motors is just placed there to keep the motors in place whilst the glue sets for the motors lol
 and yes once plugged in to the receiver the servo bits act as a speed controller

cheers Ian......I can get on with my Frogg Oakley build now......cheers. neil.

[Neil]

That is one very neat installation. 
The servo boards give very good proportional control, albeit with a very small deadband.  With old type transmitters this could be put to good use by ignoring the stick, and using the trim slider as an engine room telegraph.  If you need that power but want a more conventional response, Actions Pico ESCs do the job, and are about the same size and weight.
What are the couplers?  I have mostly settled on the flint springs from disposable lighters as being highly available, and, with their tapered ends, a good fit on a range of shafts and especially good on the very short bit of shaft you get on a servo motor.

and cheers for that info too, Malcolm.....gives me hope lol.

[ian-mccaffrey]

I might be interested in the pico speed controllers. I didn't realise they was that small
And the shafts are 2mm from marks model bits
And the couplings are from mark too

Not sure about what size props they will spin. But if personally say 20 mm is the max

[hama]

Please some "on the water shots" and perhaps a video??
Nice build, would never have thought of it!
Hama