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10-05-2022, 10:40 AM #1Junior Member
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Twin V6 prop recommendation - Laser II, Ballistic, Fury, Tempest
Hello from Spain, Ole!
I have a 25ft Tullio Abbate. It’s a 2.500 pounds, Euroboat with Twin Merc V6 200hp.
It has wide bracket (X dimension: 53”), standard Lower Units + scoops; and ballistics 23p.
Past year I made some changes in order to get rid of chinewalk: I add trim tabs, I work in the steering and lift the engines to the limit of refrigeration.
The results is a very nice improvement in stability, I move the chinewalk from 55mph to 62mph and in overall the boat runs much better.
I realise the props got a bit short, soo my plan is to moving to 25p.
Then I want to ask your recommendation in order to achieve top speed with better stability.
I guess my problem is an excess of Sternlift. I only can run neutral trim, If I move a bit bit bit to positive, immediately becomes unstable at speed.
I found a pair of 25p Laser II good price, I know they are quite obsolete but they are known to have hi rake and bowlift. also I feel the ballistic very nervous, you have to work very sensitive with throttles.
Probably best option would be Tempest or Fury; Trophy would increase the sternlift.
Thanks for your help, Javier.
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10-06-2022, 11:27 PM #2
Personally, I think laser II props are crap. I literally gave mine to a total stranger as a spare. Couldn’t bear to sell that turd to someone. Save your money and try to borrow some props in the interim for testing. Also plan on adding low water pickups if your motors are still too deep. You could even go transom mount pickups and jack them to the moon. Higher motors often help with chine walking. Also no substitute for seat time. Are your motors RH or counter rotating?
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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10-06-2022, 11:29 PM #3
With all that setback, you need to be high on your motors
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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10-09-2022, 03:21 AM #4Junior Member
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Thank you my friend for your answer.
Here as we run in the sea, we don’t use to lift as much as you the engines. I’m around 3” below de pad and probably will be lowering 1 bolt this winter (past winter I upper the equivalent to 10 bolts)
I’m studying about the Laser II and I think main issues will be:
1.- too small diameter.
3.- too small blade area.
If now I need space for getting on plane, with the Lasers maybe I will have more difficulties + huge slip at top end.
Then probably I have to move to a blade similar to Tempest (big diameter) or Fury (big blade area). Do you guys knows something good in PowerTech or Turbo?
Option 3 would be labbing the current Ballistic. They are famous to be terribly unbalanced out of the box. Soo, If I send them to add some cup/pitch in order to decrease around 300RPM could be a nice idea! I’m concern Ballistics have thing blades.
My biggest worry is the handling over 62MPH.
this a beautiful picture from this weekend!
thank you for the future advises
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10-19-2022, 10:39 PM #5
I cannot speak to running in The Ocean but I can tell you that motors that are buried too deep will make the boat handle like crap at speed. When we have a boat that is Chine walking and generally handling like crap, one of the first things we do is raise the motor and see what happens. 3 inches below the bottom of the boat is deep. especially since you have so much setback, I would expect for you to be much higher. Before you go down, humor me once and jack your motors up about 2 or 3 inches. Just see what they do. You can add the little wings or scoops to the side of your lowers to try to get more water. We often plug the top two holes as well. Really curious what your rig would do if the motors were higher. The farther your motors are back, and yours are way back there, the more height that you need for them. 3 inches would be pretty damn deep even if they were bolted to the transom. As far back as they are, that’s just crazy deep in my opinion.
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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10-20-2022, 03:50 AM #6Junior Member
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Thanks for the reply guys,
Im like 2-3” ADOVE, I made a mistake in my description.
As you mention 2-3” above with my setback is not soo much (you have to upper 4% for every inch setback)
Past year I lift the engines 5” with fixed bob’s Machine power lift. Then I got very hi for my standard lower units and engines got heated at speed.
My first solution was bolting upper 4 holes, that runs well, but in the moment you got far on lift then got heated much faster.
The second and best solution was letting free all bolts and add scoops. Then no heating issues and engines running all the time 145F.
The engines now run quite hi, of course not as with LWP, but you can listen loud the exhaust and the spray is over the case of the engines.
*buried engines
*after bob’s machines.
Finally I found a pair of 25p Laser II and I’m sending them to Mark Croxton to add cup. I found the “infamous” Lasers the ones with less diameter, soo probably will have a bit less sternlift and with the extra cup (Lasers have 0) I spect fixing usual Lasers slip issue and gain handling.Last edited by El Español; 10-20-2022 at 03:55 AM.
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10-20-2022, 04:04 AM #7Junior Member
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Also I think I have the correct height for Lasers, they don’t like very surfaced and maybe for trophy I will still buried.
fury would need more HP and tempest plus should be also very good for my application.
between Tempest Plus and Laser, I came to the second ones because of smaller diameter and blade area + the possibility to upgrade them adding cup.
About ballistics, I really love them, but they got a bit short for my application and I should work a lot in them (they have very thin blades, not easy task); Also to much sternlift for this boat.
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10-21-2022, 11:13 PM #8
Good luck in your endeavors! Please post pictures and let us know how you do.
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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11-08-2022, 01:12 PM #9The Historic Photo Master
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...counter-rotated, labbed, bravo ones...
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