Are you going to use 2s or 3s as 3800kv on 3s is a hot set up & should only be used for short speed runs as its doing 42000rpm unloaded. I would use a watercooled esc at these speeds as things get quite hot.
The inside edge of each tab is 12- 13mm from the centre of the hull so around 25 - 26mm between the 2 inner edges of the tabs. Their also around 1.5mm up from the bottom of the hull ( dont set them level with the bottom of the hull ).
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