Originally Posted by Fenlander
Yep of course it's all down to the OP's preferences and circumstances. That's why more info needed if he seeks any guidance... although he may have already gained a fair idea from reading threads and have a good idea what he wants.
Re air floor...
>>>under certain conditions yet under others buckles even though the air pressures are correctly set.
Did this happen to your Excel?
Yes and I read about it happening with larger Honwaves as well. There's obviously a limitation why air floor designs are not available in sizes above 4m. It only became apparent when loaded with heavy gear and with four adults and even then under the right conditions. Probably wouldn't have happened with only 15hp. I reckon 3.65m is the largest SIB to buy unless it has an alloy floor.
I made sure all pressures were correctly set taking into account cooling effect of launching and I made sure that the engine was mounted so that the cavitation plate was 50mm below the hull which had a surprisingly big improvement on top speed. Even though I never really got to find the optimum trim settings and engine height we realized continually hauling a heavy boat uphill through soft sand was not the way to go. Put us off using it!
Trailered launching is bliss! Our gear, Mrs Limecc and dogs all launch in the craft and there's always a slipway somewhere we can use.