Cheap fun boat?
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Apr 20, 2012
, 11:59 PM
Joined Jun 2011
Regular servo now fitted and all other electronics removed. Decided against using the paired stand-offs supplied with the model and instead used some nylon hex pillars. The reason was that the kit ones set the servo arm a tad low for good travel of the actuator rods. The original "servo" had the servo saver on top which increased its height.
This looks tidy and I tested it with a receiver borrowed from another model and it is very smooth - quite pleased.
I have a bit of egg on my face - when I got the boat yesterday I was surprised how tight the prop was to turn over but put this down to the gearbox, something I have never used before. Well......today I found that the drive dog and the shaft retaining collar were hard against the plastic at both ends stopping the prop from freely rotating. Had I picked up on this at the lake I could have seen a more sparkling display. I guess I have to apologize to NQD for comments about the poor performance and instead target their poor assembly and quality control.
I still should have picked up on this but what if.....an accountant had bought the boat?
Tomorrow I'll do a PWM drive for the motor but first have to remove it to see what is hanging off the back of it. I can see the usual disc cerami caps for noise suppression but there's something bigger - a radial electrolytic cap. No problem for a relay/battery drive but I don't want it there when I'm PWM switching at 4kHz.
What an exciting 24 hours for that boat - unwrapped, tested, gutted and partially rebuilt.
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Control box with "servo" opened. Analogous to self-parking windscreen wipers.
Where the servo used to be.
Futaba servo mounted on nylon hex pillars.
Motor with caps fitted. Electro is the back blob just beneath the black wire. Disc ceramic is below the red wire. May all get replaced by a Graupner Speed 500.