Posted by roaddog on 12/24/14 - 8:08 PM
#1
found a good deal on a new 2013 optimax 150 extra long shaft. does anyone have any info on top speed and fuel economy?
1977 21
thanks in advance
Posted by Phil T on 12/24/14 - 8:17 PM
#2
It will depend on the boat weight, mounting height and prop you select.
One could get 30 mph if mounted all the way down with an oversized aluminum prop or close to 50 mph.
While not the expert on that hull, I don't think an XL shaft is appropriate and will be too tall. You will need to mount it on a 5" or more jackplate.
I hope Finnegan will give you the definitive answer since he has several classic Outrage models, runs Mercury engines exclusively and is very well versed on performance tuning.
Posted by roaddog on 12/24/14 - 9:06 PM
#3
i measured the transom a while back i swear it was 25"
cool maybe he knows what prop i need too.
Posted by Finnegan on 12/26/14 - 1:11 PM
#4
The classic 21's use a 20" engine for both single and twin configurations. For twins, the engines must be mounted up 5 bolt holes (or four holes up if that is all your engine brand allows). I would not recommend a 25 " engine on the boat at all. It looks awkward and requires a jackplate to get it up high enough.