have a Merc XS 115 F stroke that the original owner had a Spitfire 15P 4 blade.
I wasn’t happy with the hole shot or general running.
Call Marcus at PT and we arranged for a Prop through his contacts to be direct sent.
Long story short, it’s a SCD 4 blade 16 pitch, but, on my first trip I dinged it 
and I wasn’t happy with the hole shot.
Spoke with Marcus and he said sent it on back and he’d work the blade and port it…
Wow what a difference…
Ran it on Sunday - poor fishing day, but, got to run the skiff…so,
Hole Shot - 100% improved…up in 1.5 boat lengths
Top End - slightly improved- was able to run at 5900 rpm at 38 mph with 3/4 tank
Grip - unreal - no slipping on the curves at 25-28 mph which is where I run 90% of the time
Gas mileage improved for some reason - I ran 35.2 miles on Sunday and burned, according to the Mercury Vessel management system - 7 gallons…so, right at 5.0 mpg…we had varying speeds, but, mostly in the 48-4900 rpms @ 27-28 mph.
Call Marcus if you need prop help…I wasn’t interested in top end as 35 mph top cruise is way fast enough when running Chokoloskee and Flamingo.
Pics of the prop.
I AM POSTING MY SPITFIRE X7 - 15 P FOR SALE. SEE CLASSIFIEDS OR PING ME HERE.