[C38] Cubic feet of air space

[Les]

You can get a fair approximation on most boats by the cylinderical
volume / 2 * 0.8  Thus:
	Beam is diameter, so beam/2 is radius.  
	Length overall is the cylinder length, 38'
	Thus :  5'11" is the radius (make it 6' for simpler math)
	and pi * r^2 is area thus 3.14159*6*6 is 113 square feet.
	divide that by 2 (because we only have half the cylinder) = 56.5
	multiply that by the length 56.5*38 = 2147 cubic feet as a 1/2
cylinder.
	and multiply that by 0.8 to allow for the shape of the boat = 1717.

	The 0.8 comes from the water plane area formula used by most sailboat
builders excluding those building the newer boats that carry the beam to
the stern, where the number is more like 0.88. 

	A typical 1200 square foot small house is 9600 cubic feet interior
volume (8 foot ceilings) for comparison.  A 12x15x8 master bed room is a
good approximation at 1440 cubic feet.

Regards,
Les Howell


On Fri, 2007-11-23 at 17:09 -0800, Kenneth M. Sutto wrote:
>      I have a 1983 Catalina 38 #253 up here in the Pacific Northwest.
> These last few nights have been very cold and in the morning the
> inside of the boat is sometimes frosty and always damp. I feel unsafe
> leaving a heater going all night, along with the power cost.
>      How do I figure the cubic feet of air space below decks so I can
> get the right size air dryer dehumidifier? I was told they use very
> little power and are much safer than heaters.
>      
>      Ken Sutto    #253
> 
> 
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