Short S.45 Solent takeoff problems

for some reason i cant take off in the Short S.45 Solent. even at full throttle it wont take off. and yes im trying to take off in water. any help?
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=21&t=60044
how do i know where the wind is coming from when im on the water?