In answering Sea Rider's comment, (opinion) after following his posts for a year or so, he runs in a different environment that I ran. He runs RIB boats and big water, big waves all that where what he says matters. For me, I ran right at "blowout" trimmed out as far as she would go, right at the point where the rpms started an abrupt increase and the mph started to fall off.
Some constructive clarifications & precisions :
Never said I boat al high water, big waves conditions. Although could go boating off coast is still at near plain flat water cond with min wind and no waves at all, on rare occasions some light swell to have fun surfing with.
Although we sell Tohatsu OB's mainly for Sibs/Ribs have rigged many different type of boats with the sweet OB/transom height dialed as stated on many posts. New boat owners boating to their full content.
Running an OB with doel fins attached other than riding parallel to water level will achieve doel fin water drag, more the larger. Very notorious on less HP or underpowered OB's.
To understand what have mentioned : Go for a car ride on a highway, open your window, Pull half arm out with hand riding parallel to highway, slowly rotate hand upwards, then downwards, what do you feel ? excessive hand drag, with near no drag compared to when hand rides parallel, right ? Check for yourself. Now imagine a doel fin riding on water that's 1K denser than air duplicating same air examples.
The issue about running parallel to water level while OB is trimmed to 90? with deck weight evenly distributed it's mentioned on every boat and engine Owner's Manual have had the chance to read about. It's not my invention. This cond only works fantastic if matched with spot on OB height seated on transom and if being exquisite with a prop maximization.
The issue about running excessively trimmed up is the bow rise attitute boat will achieve along unstable hull behaviour at speed along heavily hull banging. Much worse with badly deck weight distribution while riding on choppy, windy water cond that could be dangerous for other boaters sharing the ride with exception of the driver.
Texasmark, I'll bet you that as you like running your boat, wil have awfull water performance on choppy, windy cond and at tight close turns at speed. That setting only works "well" on flat calm, no wind water cond and at straight water courses and racing if pasionate doing that.
For recreational, newly or family oriented boating it's the wrong way to go.
Happy Boating
