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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › CGY750: Using the oem Fut gov sensor on Trex (600N)
05-08-2013 02:41 PM  6 years ago
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playfair

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Rochester, NY

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CGY750: Using the oem Fut gov sensor on Trex (600N)
I recently fit the Futaba governor sensor (comes with the 750) to function in the stock location of Align helicopters, and wanted to share how I did the mod.

This sensor differs from other brands because it includes several components including on-board voltage regulation and pull up resistors. It is encapsulated in silicone and sealed in a rugged enclosure... Even so, it can be de-cased to fit in the stock location of the Trex.

The only mod to the helicopter is opening up the sensor through hole in the fan shroud. I did this insitu with an Xacto blade. Also, the sensor ends up being glued (CA) in position instead of using the mounting bracket. Since this sensor does not have to be removed for any service, this was a small price to pay in order to use the oem sensor!

First, remove the little philips screw holding the case halves together.

Pry the 2 halves apart. They are still held together with silicone. Be careful not to damage the pcb!

Remove the PCB from the half it's adhered to by carefully prying it out with a jewelers flat head screwdriver. The positioning shown is least likely to damage the board, but watch out for the sensor.

The removed pcb assembly. Now carefully remove as much silicone as possible. I also trimmed the ribs from the wire holder on the side that will face the frame (it's the side with the protruding sensor head)

Prep the PCB for heat shrink, which will be it's new housing. We want the unit to be as small as possible, but there should also be a flat area to provide a bonding surface. There are several ways to do this; this pic shows hot glue that was flattened while still pliable.

Epoxy is a better option. Coat the side with the sensor head, heat shrink while still fluid, then hold that side against a flat surface while it cures.

This is the completed assembly ready to install. Clean and lightly sand the heli frame, and especially the heat shrink where it will attach. This will also serve to get it a little more "flat".

Installed. Dry fit first to check clearance in fan shroud. I used gap filling CA, located the sensor so it touches the magnet then pulled up a millimeter or so before pushing it to the frame.

If it needs to be removed, a break-away bladed knife can slice between the frame and shrink.

Good Luck! I have a couple extras available via PM.

The sky is our canvas
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