Rubbie, one of the interesting things about the sea fire is that it had the same pneumatic flaps as the land based spit. For carrier take offs they needed about 15 degrees of flap. So.. the standard spit gives you full or no flaps, its either/ or. To solve this problem at sea, they made wood wedges and inserted them under the flap.. the pilot took off and climed out where he proceeded to give a momentary full flap, jetison the wedges and close the flaps.. Kinda neat!.. BobH.