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Discussion in 'The Commercial Zone' started by John_Rosende, Mar 4, 2011.
What are the down falls to tunnel hull boats in the 15' to 19' size range?
Are there any?
Needs more horsepower.
Requires more attention to load and balance.
Much more finicky with regards to prop specifications, engine height and trim angles.
Designed for use in calm water, running a chop can present problems.
How do they require more hp, and why do they not perform as well in chop?
More wetted surface means more friction.
Tunnel takes up planing surface, provides less lift on plane.
Reshaping water takes energy and usually causes aeration
so a cupped 3 or 4 blade prop is needed to get efficient bite.
Power jack plate needed to fit engine height to conditions.
Chop lifts the boat out of the water, pushes air under the hull and tunnel loses prime.
Slower by 10-20% than non tunnel, reverse is a pain, drafts more as well, ride suffers....
However, if you wanna run skinny than a tunnel is needed as you'll run shallower than you'll float. Places like Bahamas and TX all are tunnel fans...
Hope this helps?