I'll chime in a bit. Having an older heavy displacement boat, 1966 Morgan 34, with a 3/4 keel somewhat similar to the Grampian you just can not expect make much headway in reverse. The reverse "prop thrust " is hitting the very nearby keel. Reverse "gunning" the throttle stops the boat nicely and the prop walk gets me next to the dock but getting out, especially against the wind is difficult.
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