A 28/29mm diameter 45mm long motor is the largest that will fit in the stock position without any mods to the hatch, if you make a bubble canopy or move the motor mount back when building you could fit more in.
I run Castle Ice Lite 50 with extra caps in mine at the moment, but I have tried an Ice Lite 100 for size and it fits too, much bigger than that and it would severely limit your LiPo selection.
If you planned out the servo, ESC, battery and RX placements, I think you could probably fit a 120A watercooled ESC and 3000mAh LiPo in it. If you want to work it out the space available between the transom and the boom tube is 206mm long, 54mm wide and 32mm high, but the lip is only 39mm wide, so if you want to get extreme smome may have to be built in. The stuffing tube encroaches in this space starting to come up through the floor about half way down and rising to about 11mm. The middle of the hatch angles up from about 30mm forward of the transom and rises to give 9mm extra space over the centre 28mm by the boom tube, there is plenty of space in front of even the longest motors for a RX, but most suitable servos will need an extension lead to reach that far forward. There is room for the servo up front too, if you want to think outside the box with a 350mm+ linkage. If you do take the time to find the most capable parts that can be shoehorned in post the combo and where it goes as I am sure many will want to know.
Paul Upton-Taylor, Greased Weasel Racing.
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