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Bobs nose cone good?

i will bump this older thread..... i am looking at a few different lowers for my 200 merc now! i guess my question would be- if i am already running my prop shaft height at 2 inches below the v on my starflite, how would there be any more drag with a cone? there is very little of anything in the water already! also w/ a stock lower you have a blunt nose on it and w/ a bobs you have a more arrow dynamic nose=less drag???????? also i could run my motor up to say 1inch below and run my tempest plus there! i here that is where the tempest props like to run..... i may be outa my league on this but don't know. suggestions and opinions???????
 
Enticer1 said:
Gary, on my Sportfire which was not a 75 mph boat I gained speed when installing the Bob's lower. The whole idea is to be able to raise the motor which the LWP lets you do. With less lower in the water there is less resistance. An added benifit was that it improved the handleing of the boat. I agree that if you were to just add the nose-cone and do nothing else ofcourse it would slow you down (more surface more drag) but I installed mine so I would be able to raise the engine and run a surfacing prop. The GPS don't lie, I gained mph and thats a fact.
Click to expand...

i guess this is what has me thinking! doug- what prop shaft height were you running w/ the 135 merc on your sportfire?
 
Ross
A lot of it has to do with the shape. A nose cone needs to be run level. If you trim it up, the nose points down and creates more drag and less lift. They have been tried again and again on boats under 75 MPH and they just don't work. They are built for very fast boats that need little or no positive trim. The main benefit aside from low water pickup is that that prevent lower unit 'blowout' at high speeds which can be very dangerous at 100 MPH.
On a Starflite 2" under the V is all you want to go anyway. If you go higher you will lose bow lift and your boat will go slower.
 
Starflite lower

I would just install the water pickup scoops from Merc and run it that way. You will loose bowlift with the cone unless you are running huge power and surfacing the prop on that hull.

Steve
 
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