Hull Speed

[knotflying]

Does anyone know the hull speed for the R-27?

 

[JamesTXSD]

Does anyone know the hull speed for the R-27?

Typical way of calculating displacement hull speed: the square root of (1.34 x lwl)

Assuming the length of the waterline on the 27 is 26 feet: the square root of (1.34x26) = 5.9 knots

However, the hull of the Ranger Tugs does allow the bow to rise beyond hull speed, so it really comes down to the most efficient speed (max miles per gallon), using the WAG method should be around 6 to 7 knots.

 

[SUWANNEE]

I have an R-27 and have no clue but I did find this interesting article just follow the link and scratch your forehead like I did until someone with real knowledge comes along.

Happy Tuggin

http://en.wikipedia.org/wiki/Hull_speed

 

[Bruce Moore]

The formula is actually slightly different. It's 1.34 x (square root of LWL) - if you assume the LWL is 26' then the hull speed would be 6.83 knots, about 15% greater.

There are a number of calculators and charts available on the web for those of us who don't want to do the math.

Cheers,

Bruce

 

[JamesTXSD]

Doh! You are absolutely right, Bruce - my error. 😳 I try to limit myself to one mistake per day... I'm up to June 27th, 2237 right now.

 

[knotflying]

I kind of new the formula, but wasn't sure of the Length of Waterline. So perhaps I should have rephrased the question to: Does anyone know the length of waterline on the R-27?

 

[walldog]

I kind of new the formula, but wasn't sure of the Length of Waterline. So perhaps I should have rephrased the question to: Does anyone know the length of waterline on the R-27?

Ranger Tug R27 LWL is 26'