"sonofadocker" wrote in message
oups.com...
I have purchased a used 1975 Formula Thunderbird. It has a 6 cylinder
mercruiser with an alpha i/o.

the prop is a little beat up.

what is the common prop size used on a boat like this.

19 footer with the six cylinder.

there are so many to choose when i look into a catologe or on ebay.

thanks

sonofadocker


The diameter and pitch of your existing prop will be stamped on the outside
of the hub. If you are happy with how the boat performs, stick with the
same numbers.

You can also take your prop (assuming it is aluminum) and have it repaired
for about half the cost of buying a new one.