[secant0give]

This is the speed controller I used.

http://hobbyking.com/hobbyking/store/uh_...duct=20556

I chose it because it fits nicely, because it has a decent heat sink, it's reasonably light for a 55A ESC (53g) and it cost only $23.50 from HKs AU Warehouse. I did do a quick modification to it. I cut away the heat shrink to allow air flow through the fins of the heat sink from front to back. You can see from the two photos showing the front and back of a modified and an unmodified ESC.

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I have the ESC mounted on a removable shelf. This keeps it up high, so there is space underneath for more lipos or telemetry sensors. The top hatch could also be provided with an NACA type air inlet for greater cooling of the ESC. The air would come in and blow straight through the ESC's heat sink.
The removable shelf is made form 1.5mm ply and sits on the two 1.5mm ply rails bonded to the inner sides of the fuse. These ply rails should also add some back up to prevent the motor mount bulkhead from moving aft in the event of a heavy landing.

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Currently the cooling is provided by air flow through the top hole in the motor mount bulkhead and over the top of the bulkhead itself. Some air should flow out of that hole and pretty much get blown onto the end of the ESC’s heat sink you can see how it sits in relation to the bulkhead from photo below.

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