15168Re: [bolger] Stability
- Oct 30, 2001No need for additions, John, you nailed it!
You're in luck. The flat bottom is the easiest hull type to get on plane
with the least amount of power. The drawback to flat bottoms is they are
hard riding in rough water, hence the development of other planing hull
types. The other consideration in planing is not just hull form, but weight.
A flat light boat will plane with very little power. I've got a picture
somewhere of a guy zipping around on an overturned library table fitted with
about a 5 hp outboard. That table is very clearly up on plane.
While I'm not capable of creating an exhaustive list, here is my stab at the
pros and cons. Others will certainly join in:
Flat bottom pros - shallow draft, good primary stability, low power needed
for planing, easily built, makes very small wake.
Flat bottom cons - Unstable when deeply laden, poor ultimate stability,
pounds in rough water, blows away in crosswinds, prone to 'tripping' in
hard, high speed turns.
Vbottom pros - better in rough water, less sensitive to heavy loading,
greater load carrying capacity, safer in high speed corners, higher ultimate
stability, capable of going faster in rough water, less affected by cross
Vbottom cons - harder and more expensive to build, higher power requirement
for a given speed, deep vees can be tiddly at anchor, deeper draft, bigger
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