Weight vs speed
#1
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Weight vs speed
Hi!
I have a 25 feet Phantom offshore hull. According to the builder it was built extra solid (and heavy..). The current weight is approx. 1150 kilos incl. engine less driver.
Below the front deck you will find a inner floor between the stringers running from the bow to the aft of the boat. It is made of approx. 15 mm plywood. I addition to this the cockpit floor is 25 mm, and runs from 1 meter in front of the dash to the fueltank aft.
In all those two "floors" add some kilo of wood. I plan to cut out the 15 mm plate between the stringers, since the weight in front will be less. The wooden cockpit floor will be replaced with a light weight floor. Maybe divinycell? Other suggestions?
The boat runs very flat and require positive trim. I expect less weight in front of the balance point to be approx. 70 kilos. How much speed will be gained ...??
Cheeeers and thanks, Toffen G - Norway
I have a 25 feet Phantom offshore hull. According to the builder it was built extra solid (and heavy..). The current weight is approx. 1150 kilos incl. engine less driver.
Below the front deck you will find a inner floor between the stringers running from the bow to the aft of the boat. It is made of approx. 15 mm plywood. I addition to this the cockpit floor is 25 mm, and runs from 1 meter in front of the dash to the fueltank aft.
In all those two "floors" add some kilo of wood. I plan to cut out the 15 mm plate between the stringers, since the weight in front will be less. The wooden cockpit floor will be replaced with a light weight floor. Maybe divinycell? Other suggestions?
The boat runs very flat and require positive trim. I expect less weight in front of the balance point to be approx. 70 kilos. How much speed will be gained ...??
Cheeeers and thanks, Toffen G - Norway
#4
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Thread Starter
weight vs speed
Hi!
I checked Go Fast speed calculator, and I gained 2 mph when the weight is reduced with 50 kilos. I gained 3 mph when the weight is reduced with 75 kilos. The main goal is to reduce the weigt in front., making it easier to lift the bow (+ less weight overall too).
Cheeeers and thanks, Toffen G
I checked Go Fast speed calculator, and I gained 2 mph when the weight is reduced with 50 kilos. I gained 3 mph when the weight is reduced with 75 kilos. The main goal is to reduce the weigt in front., making it easier to lift the bow (+ less weight overall too).
Cheeeers and thanks, Toffen G
#7
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Geeezze guys... don't know anything metric? one Kilo (kilogram) is 2.2 pounds... one inch is 25.4 mm. one meter is a little more than 3 feet...a liter of gas is a little more than a quart... so ... when he says his floor is 25 mm thick... it's probably one inch ply... as they say " America is going metric .... an inch at a time "........
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Jamie B.
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07-23-2004 11:25 AM