Stock Adventure with no cargo and a GPS. Calm protected ocean waters. Tested out the two sets of fins with several trips on a ¼ mile course. The original fins were 5.8 mph and turbo 6.9 mph. Looks like a twenty percent increase in speed.
There are too many variables to state this test would apply in all conditions. Fins are adjustable but for the test I had them as neutral (non-pitched) as possible.
I don’t think the new fins will be good for everyone. The speed increase comes with more torque applied to the pedal. It fills like a bike up hill. Hopefully you will be able to try them before you purchase.
When standard pedaling I had the tendency to pedal slower with the larger fins resulting in no real speed increase for cruising. After my legs get built up or rather accustomed to the new fins I suspect the speed will increase.
PS Top end sprint was 7.4 mph.
While I was there I got to meet two of the Hobie Pro Staff. Mike Allen and Den Farrier. Great guys but didn’t leak any new info on upcoming accessories.