Technical, Techniques, Hints, and Tips > The "Black Arts!" ( Electrics & Electronics )
Model Boat wiring
Pat Matthews:
What the video DOESN'T address is the all-too-common old style RC battery connector, often called the Tamiya connector. These are just bad, and do have high resistance. I believe this comes mainly from the tendency of the female sleeve to loosen up, but also from the cheap tin plating used. Under high load, the I2R losses can generate enough heat to melt the plastic housings! And this opened the door for all the alternate pluggable connectors out there, like Deans (ugh) and Powerpoles (yay) and all the rest.
Fastelectrics:
With regard to earthing the negative side of the receiver to the prop tube. One thing that has been so far over looked is that the antenna (particularly on 27 and 40MHz) should ideally be a 1/2 wavelength long. This would typically be over 16ft long on 27MHz which would be impractical, so anything we fit to our boats has to be a compromise antenna. On a metallic vehicle we can use a 1/4 antenna with the other 1/4 wave being provided by groundplane created by the vehicle body. If we connect the prop tube to the negative wire of the receiver the lake become our groundplane which increases the effectiveness of the receive antenna. You will probably find that this is unnecessary, and the range provided by your Tx/Rx combination is perfectly adequate for your needs. However, if you want to get the maximum possible range a. prop shaft earth will help.
There are certain advantages when using 2.4GHz. Frequency hopping avoids the effect of interference on spot frequencies and a 1/2 wave antenna is only about 60mm long, which is easy to house within the typical model. Noise sources such as those created by motors and control electronics do not normally extend into the GHz region.
Darren007:
I have a large tugboat 51” it has a car
Blower motor and a raboesch 400 bow thruster fitted which will run of a 7.4v pack( I’ve been told that it will not run off the 12v battery), I will be using a 12vla battery and have x2 hobbywing speed controllers the radio is a 2.4 6channel. My question is how do I wire it all up? I’m new to rc boating and don’t want to get anything wrong. Does anyone have a wiring diagram of the same set up as me?
JimG:
You are already getting this question answered in another thread so no need to piggyback on a 3 1/2 year old thread.
Jim
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