Ross Bowling wrote:Can you tell us about the performance delta? A friend of mine sails a Seawind 1000 and extended his hull and picked up 2-3 knots. What has it done for you?
From a site regarding a stretched Seawind 1000(3'):
SPEED
She's definitely faster, but when I tried a wide-open throttle test I still only got up to the 7.8 knots I had achieved when the boat was brand new ... but, each engine now has over 2200 hours on it and we have a lot more stuff onboard - sorry, I should have run a wide-open throttle test just before I had the boat lengthened. When sailing, there is a definite increase in speed - noticeable in light airs where I would guess 10% (e.g., 3.3 knots vs. the previous 3.0 knots) and maybe 5% midrange (e.g., 7.3 knots vs. the previous 7.0 knots, although I swear we seem to be motoring a good 1/2-knot faster at the motor's 'sweet spot'), and I haven't had the opportunity to go an any screaming reaches so I simply don't know yet how she does at the top end (we've previously seen over 15 knots in ocean surfing conditions). The smoother boat motion also means an increase in the average speed in lumpy conditions. We've been fighting the N->S coastal current all the way up the coast and, with a few exceptions, I've seen a disparity between the boat's knotmeter and the the GPS and thus I need to verify the knotmeter's calibration in a known zero-current location before making any wild claims.
So though every builder WANTS to observe success, 0.3kn is success.
The expected increase in the high range is less, because once the water exits the transom cleanly (~ 10 knots) waterline does not help UNLESS the entire length of the hull is reshaped. Reaching at 10kn plus, the water doesn't "know" the extensions are there. They no longer effect the wake.
