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From: Rich Ray
Date: 12 Jan 1999
Time: 16:17:34
Remote Name: gatekeeper.canon.com
The Evinrude or Johnson 4 long shaft barely is long enough to submerge the prop. So any wave causing the boat to pitch will allow the prop to come out of the water.
http://www.a27class.org/images/a27400.jpg
Shows what Geoff is talking about prior to modifying the motor mount.
The Nissan 5 Long Shaft does not suffer from this problem and also offers a reverse gear. Switching to a 7" pitch prop propels the A27 at 7.5 knots with a crew of five.
Insulating the motor cover will quiet it down and putting Treadmaster pads on the motor mount will isolate vibration.