current props used
14.25 dia 21 pitch 3 blade alum uncupped
14.25 dia 19 pitch 3 blade alum
i first started off with the 21 pitch and the boat ran wot around 49 mph. the boat did not come out of the hole like i wanted.
switched to the 19 pitch uncupped and the boat struggled to even get on plane (seemed like the prop was slipping too much out of the hole). when on plane the boat wot would run 40 mph.
took the 19 pitch and cupped the trailing edge. boat comes out of the hole better (slightly better than with the 21 pitch) but not like i want it too (boat is a v8 and should pull out of the hole better). once on plane the boat will run 45 mph and wot is higher than with the 21 by about 100 - 200 rpms.
i have an option of a new prop
15 dia 17 pitch 4 blade SS cupped
what will happen here?
the dia is larger by 3/4 in ( i have the room for the larger dia), 4 blades appossed to 3, SS vs Alum, Factory cupped vs what i cupped on the alum 19 (factory cup is more aggressive)
14.25 dia 21 pitch 3 blade alum uncupped
14.25 dia 19 pitch 3 blade alum
i first started off with the 21 pitch and the boat ran wot around 49 mph. the boat did not come out of the hole like i wanted.
switched to the 19 pitch uncupped and the boat struggled to even get on plane (seemed like the prop was slipping too much out of the hole). when on plane the boat wot would run 40 mph.
took the 19 pitch and cupped the trailing edge. boat comes out of the hole better (slightly better than with the 21 pitch) but not like i want it too (boat is a v8 and should pull out of the hole better). once on plane the boat will run 45 mph and wot is higher than with the 21 by about 100 - 200 rpms.
i have an option of a new prop
15 dia 17 pitch 4 blade SS cupped
what will happen here?
the dia is larger by 3/4 in ( i have the room for the larger dia), 4 blades appossed to 3, SS vs Alum, Factory cupped vs what i cupped on the alum 19 (factory cup is more aggressive)