i don't know if i should even be trying this, but i tried to launch it from the i400 sub, and it's quite strange - it launches off the catapult in a more vertical way than horizontal (looks quite wrong) and in the process it damages its floats.
if it's not meant to be launched this way, then i apologise for mentioning it.
other than that, no real problems, other then the 'static' rotating prop animation as mentioned by others.
all in all, i am happy with it, so thanks again for this great little plane.