oddly no, you would think there is a lot of force being generated, but ive never had it come off.
We only use it when we are riding goofy, otherwise it has a negative effect on the port side wave. I've even experimented with using it in a neutral possition on the port side but it kills the wave. this makes me think that installing permanent trim tabs isnt a good idea on my boat. We use a mask to swim down and put it on when we need it and then take it off when we are done. Also I should mention that we use a Switblade hydrofoil.