I rechecked current AV plate height today and it's 3.75" above keel, not quite as high as I thought. The pic I got isn't real clear (couldn't find my old white plastic scale); the metric side of the scale is actually more readable than the english units . . . the 9.5" cm measurement converts to about 3.75". The AV plate is still underwater when on plane; my guess is that it needs to be raised to at least 4.0 to 4.25" via a jackplate or spacer. The middle pic was taken before Don redrilled the mounting holes to raise the motor and last pic was taken after raising. The most obvious difference is the position of the lower bolt relative to the 2" tall bootstripe.
My 25" motor is currently mounted as high as it will go. I need to check hole spacing on motor bracket to determine total height adjustment available, but I suspect a 20" shaft motor might actually work if you mount it as low as possible with bracket mounted at height Don recommends, and with mount bolts positioned in top holes so you can raise it if necessary. although you will have to decide if you can live with the powerhead relatively close to the water!
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