is it ok to remove the shrink plastic off my vtx ( unify pro5.8) to install a heat sink ?????????

You can remove the heat shrink, but I don't think I would. Most of the time the these things are strapped to some portion of the frame...which is usually carbon fiber.....which is electrical conductive. The heat shrink serves to insulate the VTX from being shorted against the frame, helps keep dirt out of it etc. Unless you have a very unique installation, I doubt it needs a heat sink.

Best way to cool a VTX.... Fly!

you can probably just install the heatsink directly on top of the heatshrink without the heatshrink you could short the VTX when installing in on top of carbon fibre frame.

but like Droneofprety mentioned, as long as you are flying, the air flow will cool your VTX down

What I do is take one of the black emery boards that girls use to file nails and use it to sand through the heatshrink by holding it on a 45 degree angle to the rf module on the vtx. Once all the way through you can just lift off the square piece of hestshrink and install the heatsink. So you just basically sand through the heatshrink on the edges (or corners) of the rf module. Works real well

(06-Mar-2018, 05:05 PM)Oscar Wrote: you can probably just install the heatsink directly on top of the heatshrink without the heatshrink you could short the VTX when installing in on top of carbon fibre frame.

but like Droneofprety mentioned, as long as you are flying, the air flow will cool your VTX down

I take the heat shrink off all my VTX transmitters for adding a 20mmX20mm heat sink and the same size heat sink sticker. I also peel the sticker off the top of the transmitter. To insulate the VTX against shorting out on the side that would make contact I use MG Chemicals Red Insulating Varnish . 

Your VTX will run better with the heat sink on it and not burn out if you are running anything from 200mw and above.

For the transmitter side and the rest of your electronics, I use this for protecting my electronic circuit boards from dirt/dust, corrosion and for water proofing. I apply it in layers (6 to 8) and allow it to completely cure for 4 days before powering it up. You can solder through the silicon coating. Also if you have disconnect ports on the circuit board, be sure you have the plugs connected during the application process. I use this stuff on all my electronics that I want to last.

The heat shrink will trap dust and dirt in your circuit board and spreads the heat to the other components inside.