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leclerc457

New '18 21 VLX prop - HELP!!

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leclerc457

Took my new 18 21 VLX with 410 out today.  Have 550 bags PnP in rear.  Had bags about 50% and center and front tanks full.  Had 6 in the boat (4 kids) and 2 in the bow.  Wedge all the way down and the boat would barely get over 9mph.  Fuel in tank is about 80%.  

 

Boat has ACME 2313 15x12 V L prop - seems really strange that I am only turning 3,000 rpm's WOT and can't get over 9mph.  When we emptied the tanks it got better but then the wake was too small for me to surf.  

 

Elevation is about 4,500ft in CO where we were.

 

Any thoughts???

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hunter77ah

Need more bow weight.  It will help the angle.  I’m guessing your bow was pointed halfway to the moon?

if you don’t add bow weight, drain half of the 550s

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NWBU

Also use less wedge, starting at say 2-3 clicks from lift. This will keep the bow angle from being too high for the prop to push the boat forward. Adding bow weight has the same effect.

I regularly launch in the lift setting so the boat isn’t fighting the drag of the wedge at launch and then click the edge down where I want it right as the speed control kicks in. 

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bchambers

what is the stock prop that 2018 mlx/vlx come with from the factory?  Anyone know?

 

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23LSVOwner
5 hours ago, bchambers said:

what is the stock prop that 2018 mlx/vlx come with from the factory?  Anyone know?

 

 

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Blenderhead

Stock prop for the 2018 21 VLX is the OG948 15x14 prop.  The high torque option and my recommendation is the OG 945 prop which I run on mine.   Awesome performance out of the hole and a noticeable difference from the 948.

What I find weird is that your boat came with a ACME 15x12 prop.  Definitely not the Malibu recommended prop for that motor and transmission.  

This is what my Malibu Rep sent me regarding prop selection for the 2018 21 VLX
----------------------------------
Here are the prop recommendations for your engine/boat set up:

Engine Variant/Gear Ratio

VTX/21VLX - 1.5:1 transmission

MONSOON 410 (6.2L FORD) 1.5:1 Closed Cooled

912 for Speed

948 Standard

945 HA/Torque

-------------------------------------

Propeller, 14.75" x 15.75" LC 1-1/8" 4 Blade Wake Pro V3, OJ

3542017

912

Propeller, 15" x 14" LC 1-1/8" 4 Blade Wake Pro V3, OJ

3542019

948

Propeller, 15" x 13" LC 1-1/8" 4 Blade Wake Pro V3, OJ

3542018

945

Edited by Blenderhead

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Five Cent Worth

Some good info already out here.  Same problem as you but I could get to 10.4 ish....  A person in the bow makes a huge difference.

 

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Blenderhead
1 hour ago, Five Cent Worth said:

Some good info already out here.  Same problem as you but I could get to 10.4 ish....  A person in the bow makes a huge difference.

 

Yep.  That's the thread where I answered my own questions without knowing it was my thread....lol.  Weight in the bow is a definite must.  With just me and a driver I run 400-500lbs of lead weight on my bow.

Edited by Blenderhead

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Weaklink

as others have said-weight in the bow and also I run the wedge 1 click from the lowest setting. If the boat is struggling I order everyone to the bow. Just try it. It's an eye opener. I keep 250# of lead in the boat.

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