Very happy with folding prop all around but especially in
light air as is the case in our cruising grounds on western
Long Island Sound in summer months.
Advantage varies...I do not race but would approximate as much as 1/2 knot at times.
I have a 15" 2 blade Flex o Fold on my 30 fter, prop is geared so
blades open together every time...can stop on a dime if I have to
and reverse is excellant.
Design is simple, I understand that it has become standard equipement on some very high end yachts.
Mine is attached to a saildrive and cost $1000. 4-5 years ago,
understand a shaft prop would be less than a saildrive version
but then I'm sure prices have increased.
Can not compare to a feathering prop.
There should be other threads on folding/feathering props on the