Originally Posted by C-NUMB
The problem is, that if You change both make of propeller and pitch, outcome will be complete guesswork, the design differences between various brands is so big. I noted this on my tohatsu 25 and also recently on my 90 yam(same pitch, big difference in performance).
Go with the stock 11x13 or borrow another 11x13 , black max, solas, that might make the trick!
I'm surprised at what you say, but at the same time agree as it makes sense!
Also the Solas prop looks identical to my OEM one and also I have been told by a couple of different propeller specialists now that Tohatsu no longer actually make their own props and I must admit my OEM prop looks identical in how it is made and the style to the Solas prop! I have also noticed that Solas are the only prop manufactuer that sell the exactly the same diameter and pitch sized props as Tohatsu have in their prop chart! This is also a coincidence! Lastly I read somewhere on the internet that Solas make the Yamaha props and someone told me that Solas make some of the Tohatsu ones.
Either way the style of the two props I have look identical, so I am shocked I have lost 1000 rpm for a 2" pitch increase!
Also whilst I am here, I refitted the OEM prop today and I now think the splashing as I call it is not a problem as it is similar with both props, just slightly worse with the slightly higher pitched Solas prop!
As for speed, the sea today and yesterday has been flatter/calmer than normal and I have noticed before that in dead calm seas my max speed is a couple of mph less than when there is a bit of chop/waves. Well yesterday with the Solas prop I hit 38mph @ 5000 rpm (WOT) and today I hit 37mph @ what looked like virtually 6000 rpm but wasn’t quite 6000 rpm as the limiter was not kicking in (the water was dead flat this evening!) This miffed me until I remembered that my rib goes faster with some waves, only 2mph faster. I thought I would mention this as it shows that the solas prop was indeed 1mph faster at 5000 rpm than the OEM prop. I am just miffed at my WOT loosing 1000 rpm with it though!