When I bought Touche', I seem to recall it had a 10 or 12 inch 3 blade fixed at 6? pitch with the AT4.
Now with the Universal 25XPB with a 2:05 reduction, Touche' is swinging a 14 x 14 Martec 2 blade folder. Couple points: It feels like it's slightly underpitched. I can get about 6.7-6.9 knots at max 2900 engine rpm. I cruise at 6.3-6.4 kts at 2400 rpm. RPM's were calibrated with an optical tach. The 14 inch clears the hull well because the Martec prop has a long hub. Pics in the link below. One pic has a tape measure attached to the open prop to show the clearance from tip to hull. https://drive.google.com/drive/folders/0B_sb5TfIENvsY2xPRW9XNUhLczg?resourcekey=0-WfvlRXZuplgGlho8cWBFOQ&usp=sharing -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Wed, May 28, 2025 at 11:48 AM ALAN BERGEN via CnC-List < cnc-list@cnc-list.com> wrote: . What diameter prop do other Mk I owners have on their boats? How far does > the shaft extend past the cutless bearing on their boats? Instead of going > to a larger diameter prop, decide on the right pitch. You should be able to > reach the highest rated RPM for your engine at full throttle. If you can't, > your pitch is too high. If you can reach the highest rated RPM before > reaching full throttle, your pitch is too low. >
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