42 executioner prop slip
 

Hello Fountain experts. New to me is a 2006 42 Executioner with 525's and bravo XR's standard lowers (not sport masters) with 32 pitch bravo 4 blade none labbed props. Love the way boat rides and handles but feel its down on speed compared to a lot posts I have seen on this forum. When I sea trialed boat boat ran 78 mph at 5200rpm and I figured that was ok because we where full of fuel and 4 adults on A hot day and really was not trying for every last MPH out of boat. This past weekend I ran boat down on fuel to 1/2 main tanks rear tanks where empty and on dead calm sticky water 3 adults could only pull 76 mph at 5300 trimming it positive past neutral to gain the last mph. Thats 29% prop slip! I did mark my indicators at neutral at 3 1/2 and could run 74ish at neutral at 5100 and trim to 5 1/2 to get extra 2 mph and 2 hundred RPM. The motors are pulling the RPMs but slip is really bad. Any ideas on better set up? I was told by a lot other 42 owners that they are running low to mid 80s with this set up.

A 06 with sportys and 525 will run 85 all day long with 32 4 blades it pretty much what they all run

You think sport masters make that much difference? Very hard to believe. Most executioners I see have standard bravo bottoms. Not sure why.

check the diameter of the props ? could be cut down it doesn't take much

Good idea! What is stock diameter 15 and 1/4?

yep

Well I measured props and are cut down to 15". Hard to believe 1/4 inch makes that much difference but I will be looking for different props to try. Who knows what else have been done to props. Must be my problem I hope. Thank you bblythe

42s love 4 blade bravos , you can spend a bunch of money it isnt going to get you much . go to b blades get a good set of labbed bravo 1 . 5 blades will be hard on drives

1/4" can be a big deal when it comes to props.

I have heard in the past from a from a friend that had several 42's that the boat will run a better number with the rear tanks full, I believe his thought was it carried the bow better.

Every hull is somewhat different and even stock props can be all over the map. Try to run several sets if you can. You can figure your slip on the Bam website with their speed calculator, and there is also the good old mathematical formula. Point of reference here, not apples to apples, my 35 will run 91-92 @ 5400 with stock 32 Bravo 4blds. Likes to run with full tanks, and lite on fuel will seldom add to the number on any given day.

Definitely when you have any fuel keep it in the saddle tanks, where were your Tabs set, Maybe over trimming and losing bite. are you spinning in or out?

I played with trim and tabs all over but gained couple mph by trimming way positive. My slip numbers are to high every where even when drives are trimmed in. No idea what has been done to the props I am running. They look like stock bravo 4 blades but obviously they have been cut down 1/4 inch and who knows what else have been done to them. Going to start with some new stock 32s and give it another try. I was also wounding on what fuel tanks to run on front or back. Thanks for input on running rear saddle tanks full and main empty.

Also spinning props in. Is that the best way on 42s?

props in stern lift props out bow lift

You need 2 in spacers. We went through this with a buddies 2006 42 EX. Hard to get on plane. Huge rooster tail. Went to 5 blades. No help. I added 2 in spacers and now it will run 86 if you give it enough room to get there.

Well I just talked with Brett at Bblades and Mercury bravo 1s are advertised at 15.25 diameter but really are only measure 15". He is sending me some new Bblade 4 speed props to test that are true 15.50 diameter and going to give them a shot. I also am going to try a set of 32 bravo 1s Brett labbed for my buddys Cigarette that have some more bit built into them and Brett says may work for me. Does any one know there X dimensions on 42 executioners so I can compare? Maybe will need to add spacers to get the boat to work?

Well I did some prop testing this past weekend with good results. Conditions where perfect. 69 degrees 1 to 2 foot chop front tanks low on fuel rear saddle tanks full fuel and 3 adults 1 teenager in boat. With Bblades lab finished 32 bravo 1s 83 mph at 5400rpm and 52mph cruise speed at 3500 rpm. With Bblades 4 speed propellers 84.7 at 5150 rpms and Cruise speed 55 mph at 3500 rpm but was tricky to get on plain with 4 speed props. The 4 speed props did have 1/4 vent plugs so think that may have caused the plaining issue. Waiting for Bblades response. All in all the 4 speed props seem to hook pretty hard and put some really good numbers for non lab finished propeller. Thinking Brett can lab them to bring rpm up to 5300ish and maybe gain little speed but all in all really happy with 84.7 with 525 powered 42 foot boat. The boat rides and handles so good. Glad I made the switch.

Hey I know who you are talking about...LOL

Update, Went out this past weekend with 5 people and 100 gallons fuel and really struggled to get boat on plane with 4 speed props. Really bad like 1 mile at 3k rpms trying to keep props from blowing out and when we got boat on plane only would run 76mph at 4950rpm. Conditions where not as good as last weekend but not that bad either. 70 degrees and calm water. How can I loose 8 mph in calm water with extra 400lbs on boat. I then ran fuel down and lost passenger so 4 adults and still 76 flashed 77mph once at about 5k rpm and planing was still really bad. I know may need to space drives down little but boat does plane pretty good with bravo props but why am I loosing so much speed in calm water. Think I could have hook in bottom? Hows the best way to check for hook and what is acceptable?

When you want to know how to set the boat up call me....LOL

I PM'ed ya. Thanks

backwards

I run a 2005 42 Ex with staggered 525s and Bravo XRs. I run the rear tanks empty. The boat runs very flat. I use 5 blade Maximus 28P routinely, and labbed 30's for poker runs for years now. I currently get 77-78 on the 28s and 80-81 on the labbed 30s. I also have labbed 32P 4 blade Bravos that get me to 83-84. The boat has been this way since I bought it in 2006. It has about 350 hours now and the speeds have dropped about 1-2 mph but still runs perfect. The 5 blades make a HUGE difference in the handling of this boat around the docks.

[QUOTE=On Time;4588827]I run a 2005 42 Ex with staggered 525s and Bravo XRs. I run the rear tanks empty. The boat runs very flat. I use 5 blade Maximus 28P routinely, and labbed 30's for poker runs for years now. I currently get 77-78 on the 28s and 80-81 on the labbed 30s. I also have labbed 32P 4 blade Bravos that get me to 83-84. The boat has been this way since I bought it in 2006. It has about 350 hours now and the speeds have dropped about 1-2 mph but still runs perfect. The 5 blades make a HUGE difference in the handling of this boat around the docks.[/QUOT

Is there a big difference in planing with Maximus versus bravos?

[QUOTE=rvtransport;4588831]Yes, huge. When new we had some beefy dudes in the back seat on a poker run and could not get on plane no matter what with the 32 Bravos. Very embarrassing. Never this problem with the 28 Maximus. But, not as fast...

Well better then back seat full of beefy women I think. lol! Thanks for info though.

Agreed!!
BTW that beefy dude now runs his own 43 Nor-Tech with 700s
Quite a boat that is

I already tried,,,, gonna be like getting you to finally listen to me years ago LOL

OK OK so it took a while...LOL