wrote in message
...
On Tue, 29 Aug 2006 22:10:11 GMT, Jack Redington
wrote:

The Mercury Bigfoot is more then just a prop..

From the Mercury site:
"BigFoot models feature greater torque, larger propellers, and beefed up
drive-train components to handle the extra weight and turbulence of
pontoons."

Capt Jack R.

Merc put me in a 13.75x11 on my pontoon (20' with a 60)

The "big foot" is nothing more than the next bigger foot for the
engine in question. My 60 (same as 40 & 50) uses the 75-90 foot. It is
the same as I had on my 75 Mariner, right down to the round sticker
with the "13" on it.
That is the old Merc foot (SAE bolts) and the powerhead is a licensed
Yammy (metric) Same with my 1989 Merc/Mariner

The next leg up with less gearing. The same engine RPM gives less propeller
RPM and can swing a bigger propeller in size and pitch.