My Tartan 34c had a 12x 7 or x 8 with a direct drive A4 when I bought it 20 years ago. The boat
maxed out at 1700 rpm producing 6 knots in calm water.
In a heavy chop it would lug and only produce 2 or 3 knots.
The Indigo prop was specifically designed for this boat. With it
the boat can do 6.6 in calm waters and over 5 in heavy chop with a clean bottom. The trade off is a much weaker reverse thrust
I have seen other people try to use the Indigo on a A4 reduction drive on a Bristol 32
which did not produce more than 4 1/2 knots. I gave him my old prop and it worked much better for him.
Best Art
|