'76 mercruiser 140 in a 16 foot Rinker open bow tri-hull. I don't remember what rpm's it runs at right off hand but it has a 23 pitch prop on it. Standard alum. 3blade. Does this sound right for this boat? I've got a couple mercruiser props that are 21 pitch that were off of a older deep V rinker 140 that I used to have & a couple 17's (a regular 3 blade & a cupped 3 blade) from I don't know where. It always seemed to do fine but I didn't know if that 23 was right for it or not. Gonna take her to the lake maybe tomorrow so I'll see how she runs out.