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Originally Posted by Vezo, Part II
I'm aware that Denny has advised that he is getting best results with identical SeaFari 20 (yes, now sold) and Etec Gen 1 150, using a PT OS4 15 X 15. I have an opportunity to buy a used 15.5 X 17 for about half the money. Ironically from a SeaCraft 23 looking to go up to an 18 on a Gen 1 300. How close is this to a new 15 X 15? Is Denny still amongst us?
Vezo, Part II
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The first PT prop I tried was an ELE4 17” pitch prop, and I couldn’t turn in much over about 5000 rpm with a full cruising load, so I traded it for the 15” prop. I believe your motor is the same vintage as mine was, so it needs to turn 5300-5500; newer models like Capt. Terry’s want to spin a couple hundred rpm faster. The ELE prop supposedly had the same blade profile as the old OMC SST prop which I ran with my 115 and was a very good performing prop. Don’t know what the difference is between the ELE and OFS props are, but the PT guys should be able to tell you. The 15” PT ELE4 prop is an ok prop with good stern lift and hole shot, but it’s not as good as the 15”P Cyclone, which was 2-3 mph faster and easily exceeded 4.0 mpg at cruise vs 3.7-3.8 for the PT prop! Although the PT props might be a little cheaper, if you really want the best prop look for a 15P Cyclone. Also make sure you’re running the right thrust washer to make sure it fits the taper on the prop shaft correctly. There have been some prop shaft failures when guys were running Merc props because the thrust washer didn’t properly match the shaft taper.