scarab63

iTrader: (5)

Great history on #2 !!!!!!!!

IRONMAN

Depends on engine displacement and X dim. 17.5 or higher liked 4 blade best. 17 - 17.5 3 or 4 work well, slight nod to the 3 for top end but a labbed 4 will put up same numbers with better mid, planing and acceleration. 454's ran better with 3's 502 had torque to turn 4's or 3's (i know i just answered your question with a question but in general Mirage plus 25-27 would be close)

Great history you found on your Pantera, people don't just make up that kind of stuff.

bigboat28

Sorry about the question off topic but Ironman, on a 28 with 425hp 454's now turning 15 3/8 by 26 4 blade props at 42-4300 and having a porpois problem what would dropping to 17 1/2 by 22 4 blades do? Would that allow my rpm to go up or would the diameter be to big? Also would they help to carry the bow to stop the porpoising? The drives are number III's with 1.33 gears.

88bullet

iTrader: (1)

put blowers on it and power through the hop

vintage chromoly

iTrader: (3)

thanks ironman! i'm planning on a 17 inch x as per pepe and jo's recommendation for a 24 7 hull.

you are right. you cannot make up the stuff these guys lived through and experienced. it was awesome talking to some old school off shore guys!

vintage chromoly

iTrader: (3)

another thing the original owner told me was that the side nav lights were not originally on the boat when it was delivered. apparently, pepe caught some **** from the coast guard about the lighting and was mandated to add the side nav lights.

pepe mailed the original owner the nav lights for the port and starboard sides and they were then installed some time later.

IRONMAN

I think the rule of thumb is 200rpm per inch of pitch and 100 rpm per inch of diameter roughly, soooo you should be at about 800 rpms up on the pitch then lose about 200 on the larger diameter that still puts the 454's a little short or your most likely goal of 52 - 5400rpm As far as porpising, generally the bigger diam will help and more prop rpm will help. You are turning them out right??

IRONMAN

Nice thing too about the 17 - 17.25 is we all know the standard water pickups work well there. Here are some pictures of my old 24 set at just below 18, I had an external water pickup already so the intakes above the waterline did not matter.

bouyhunter

That looks familiar.

IRONMAN

It should, Found the cool drive height pictures and wanted to share them. How is it coming along?