Prop upgrade 15’ SAN210

[pdublya]

I’m looking to get more top end out of my 210 with the 350. I don’t mind sacrificing hole shot in the process Currently the boat tops out at 38-39. I like to barefoot and would like to get a more MPH. Acme has suggested I go with a 381 vs the 1579 I currently have on the boat but couldn’t give me an idea of how much of an MPH increase I should expect. Anyone have any experience with this change and what kind of increase they were able to achieve? Thanks in advance for the info.

[FMSKI]

ACME doesn't know the total drag on the hull @ speed = X mph, which is limited by max HP. X being your top speed. Reduce weight, clean the bottom, X speed will go up.
14 pitch is steep the RPM's are too high for a speed run. So for sure going to a 381 will be more comfortable vs racing the motor

I forget my top speed on the 381 but it was fast, mid 40's, but I don't think I had it pegged. lightly loaded SV211. It was a fun prop for lake cruising. I think Nautique wanted that I/O sports boat performance out of the SV211 "limited" pairing it to the 381... that was achieved.

I didn't like the 381 prop for slalom skiing and found that the diameter was the problem. I just had the 381 cut down to 13" and tuned (479 spec) and it's fantastic for skiing. Low wake, low rooster, lower rpms. The 645 is a great all-rounder, but as a guess would knock ~2 mph off.

My props are
1433 Surf
645 IDK what to do
Chopped 381 (479) Ski & cruise

[pdublya]

ACME doesn't know the total drag on the hull @ speed = X mph, which is limited by max HP. X being your top speed. Reduce weight, clean the bottom, X speed will go up.
14 pitch is steep the RPM's are too high for a speed run. So for sure going to a 381 will be more comfortable vs racing the motor

I forget my top speed on the 381 but it was fast, mid 40's, but I don't think I had it pegged. lightly loaded SV211. It was a fun prop for lake cruising. I think Nautique wanted that I/O sports boat performance out of the SV211 "limited" pairing it to the 381... that was achieved.

I didn't like the 381 prop for slalom skiing and found that the diameter was the problem. I just had the 381 cut down to 13" and tuned (479 spec) and it's fantastic for skiing. Low wake, low rooster, lower rpms. The 645 is a great all-rounder, but as a guess would knock ~2 mph off.

My props are
1433 Surf
645 IDK what to do
Chopped 381 (479) Ski & cruise

thanks for the great info!

[FMSKI]

Got my chopped 381* on for speed test today, about 5150 rpm running 46-47 mph, bit more to go. Hitting 40 was comfortable; this is the prop I personally would use for footin'. I accelerated to 38 when I used to tumble up with the 196.


From PCM: A one-inch change in either the pitch or diameter of a given propeller will generally change engine RPM by 150 to 250 RPM.

[pdublya]

Got a 381 from a friend to try before I make any purchases for myself. Thanks again for the info.

[FMSKI]

I looked around at 381s (thought about selling mine) & concluded is not sought after because most people want to pitch down for surf.Several sitting on Ebay and offers would most likely be considered.
Used it's a $200+/- prop.