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Old 16 August 2011, 10:30   #1
Country: UK - England
Town: Birmingham
Boat name: Rosie
Make: Valiant PT520
Length: 5m +
Engine: 90hp Mariner Optimax
Join Date: Apr 2011
Posts: 44
Hard to plane

My RIB struggles to plane in the chop and it not much better in the calm seas....I have a vailiant pt520 mariner 90....really need to get it sort ..stopping me fun...

andrew nolan is offline   Reply With Quote
Old 16 August 2011, 10:51   #2
Join Date: Jun 2010
Posts: 2,934
90hp should be plenty of grunt to get that on the plane.

what is max RPM your seeing?

how many are aboard when this happens?


Xk59D is offline   Reply With Quote
Old 16 August 2011, 11:48   #3
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Poly's Avatar
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,542
In addition to Xk59D q's...

What prop do you have on?
I assume that the engine has Power Trim and you know how to use it (down till on the plane then up till going fast - basically).
Could the inside of the hull be full of water.
What speed are you getting?
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Old 16 August 2011, 19:50   #4
Ian M's Avatar
Country: UK - England
Town: New Milton
Boat name: Jianna
Make: Osprey
Length: 6m +
Engine: 200 E-TEC
MMSI: 235076954
Join Date: Sep 2004
Posts: 1,940 the hull clean. If permanently on the water growth can have a dramatic effect on performance

Dust creation specialist
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Old 18 August 2011, 08:15   #5
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
More Qs..... If it's an Optimax, any lights on the dials that might hint it's in "get you home" mode?

Does it sound like it's labouring? (I guess it will have electronic rev. limiting so shouldn't go the other way)

Is the engine secondhand? If so, any idea what it was pushing along before it met your rib? (prrop likely sized for previous job, as mine was)
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