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From a performance perspective here's how I look at it, theoretically.
> 3 blade fixed - 6 knot/hr average in 24 hours = 144nm/day or 1,008nm/wk
> 3 blade featuring - .5 knot in added performance = 12nm/day or 84nm/wk
> 3 blade folder - .75 knot in added performance = 18nm/day or 126nm/wk
A folder over a feather still gives me the advantage of 6nm/day or 48nm/week. By looking at these numbers, on a long passage (w/folder) I can potentially save time on the engine, make up 3/4 day/wk, and less wear and maintenance on the engine.
And on occassion, on the race course, being the spoiler is kinda fun.
+ If I can get an efficient blade while motoring, overdrive or other, there's further savings.
As mentioned earlier I've narrowed the field down to Gori 3 Blade Folder or Autoprop, if they fit. I found I have an additional limitation where the shaft is exposed by only 7 1/2 inches to support both zinc and prop.
Still waiting for sizing and costs.
Dan, Celestial 48'
Toronto, sailing Lake Ontario & Thousand Islands