[alberg30] Re: Alberg Speed

[Robert E Johns]

From: Robert E Johns <bobjns at nais.com>

Hello all,

This is just a thought, but I have never seen this theory mentioned before.
The exhaust on Wind Call is well out of the water at rest  with two people
in the cockpit.. Under power at 5 - 5.5 knots it is completely submerged
under the stern wave. Is it possible that the stern wave has the effect of
increasing the effective waterline length when moving at  this speed or
faster?

I always assumed that the A30 hull speed was 6.1 kts (1.3 * the square root
of the waterline length). Barbara and I had one wild spinnaker run (no
heeling) where we were holding over this hull speed and we dropped the
spinnaker when the speed surged to 7 kts a few times. The knotmeter had
been accurately calibrated before the cruise over a measured 1/2 mile and
the bottom was clean.

Does this idea make any sense?

Bob Johns Wind Call #397


>From: "J.Sousa" <jsss at net1plus.com>
>
>Robert,
>    Since the LWL on the Alberg is very short, you really can't go by the
>regular formula.  Calculated with 0 degree heel, hull speed is 6.2 kts.
>Fortunately, the Alberg heels a lot and the LWL increases, making hull speed
>when heeled somewhere around 6-7 kts.  If you are trimmed in too tight
>though, and have a lot of weather helm, the rudder will actually slow you
>down.
>
>Regards,
>
>Chris Sousa
>#114
>Carina Vela
>
>Robert Brody wrote:
>
>> From: Robert Brody <sailboat at webspan.net>
>>
>> What is the maximum speed for an Alberg 30?
>> Also: How does the boat rate for racing???
>>
>> Thanks,
>>
>> Robert B.
>> NY



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