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post #9 of Old 02-07-2012
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Your trigonemetry is correct.

The heel angle needed for the 19 ft bridge clearance is given by...

a = invcos{19/25} = 40.53 deg

...and for the 21 ft bridge clearance...

b = invcos{21/25} = 32.86 deg.

Those are first estimates, as the mast will not pivot perfectly around a single point as the boat heels.

Those are quite aggressive heel angles.

It's a risky business though. If you get it wrong, you will smash the masthead and fittings on the bridge. You may even bring the mast down.
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