Building the Glen-L Monaco :       http://www.chelseacoachworks.com/boats/projects/dow/index.html
1 Conversion Factors 11-DEC-2006
lbs to kg 0.4536
kg to lbs 2.205
m3 to 3ft 35.31
Foam density of 1 m3 of foam   32.14 kg
2 Specifications http://www.glen-l.com/designs/inboard/monaco.html
  https://www.boatdesigns.com/products.asp?dept=240
Item   Lbs Kg   Refrence
Hull weight   950 430.92   Glen-L Marine Designs - Monaco Specifications
Hull hardware          
Engine   535 242.68   Handbook of Engine Swapping, John Thawley, 1960
Max Load   3200 1451.52   Includes weight of the installed engine and related parts - estimated
Person Capacity. 6 990 449.06   Maximum person capacity = 165 lbs per person
LWL         Loaded Water Line.  Glen-L Marine Designs - Plans Sheet # 1
Deck weight   200 90.72   Estimated
Deck hardware   20 9.07   Estimated
Frames         Glen-L Marine Designs - frame kit shipping weight
We   1032 468.12   Weight of engine and related parts.  Includes engine, driveline and battery.
      
Complete Boat build photos can be seen at :       http://www.chelseacoachworks.com/boats/projects/dow/index.html
3 Swamped Weight of vessel and fittings other than engine-related equipment  
Formula :
Ws = sum ( Wh * k ) + Wd + 0.69 Wf
Where :
Ws = Swamped weight (kg.)
Wh = Dry weight in kilograms of various materials used in hull construction (kg.)
k = Conversion factor applied to the weight of each piece of hull material (Wh), to convert the dry material (h) to an equivalent weight when submerged in fresh water as determined byTable 4-2 .
Wd = Weight of deck and superstructure (kg.)
Wf = Weight of permanent fittings not included in Wd (kg.).
Step 1 Identify the hull construction components and determine their weights when submerged, sum( Wh * k )
Part Description Weight            (lbs)   Weight (kg)   Factor(K) Table 4-2   Submerged Weight
   
sum(Wh x k) = Lumber - mahogany 250.00 113.40 * -0.78 = -88.45
Plywood 200.00 90.72 * -0.81 = -73.48
Fiberglass 160.00 72.58 * 0.33 = 23.95 See note
Epoxy - 5 gall @ 10 lbs 50.00 22.68 * 0.33 = 7.48
Hull bronze hardware 2.00 0.91 * 0.89 = 0.81
Hull steel hardware 8.00 3.63 * 0.88 = 3.19
TOTAL   670.00 303.91 -126.50
Wh = Dry weight in kilograms of various materials used in hull construction (kg.)
k = Conversion factor applied to the weight of each piece of hull material (Wh), to convert the dry material (h) to an equivalent weight when submerged in fresh water as determined byTable 4-2 .
To obtain the factor for materials not listed in Table 4-2, the following formula may be used :     
Factor = ( Specific Gravity - 1 ) / Specific Gravity.  
Note : The Specific Gravity is the ratio of the density of a substance to the density of water (fresh) at 39 degrees F.  Weight of water (fresh) at 39 degrees F = 62.4 lbs/cubic foot.  Its Specific Gravity is 1.0 .
Notes : Wetted-out fiberglass cloth = 66 sq ft (sides) + 92 sq. ft (bottom) + 12 sq. ft (transom) =160 sq. ft of 7.5 oz. cloth at .104 lbs/sq.ft . (Fiberglass Boatbuilding for Amateurs, Ken Hankinson, 1982)
Step 2 Identify the deck construction components and determine their dry weights Wd 
Part Description Weight            (lbs)   Weight (kg)
Wd = Lumber & Plywood 195.00 88.45
Fiberglass 5.00 2.27 40 sq. ft * .104
Deck fittings 20.00 9.07
TOTAL   220.00 99.79
Step 3 Identify the weight of permanent fittings not included in Wd (e.g. factory installed equipment).
Part Description Weight            (lbs)   Weight (kg)
Wf =   0.00 0.00
TOTAL   0.00 0.00
Step 4 Identify the engine and related equipment and calculate their weight We as installed. Includes engine, driveline and battery.
Part Description Weight            (lbs)   Weight (kg)
We = Engine. Chevrolet 283 CID V8 - Long Block, no manifolds 535.00 242.68
Exhaust manifolds, risers, front motor mount, marine oil pan - cast iron 175.00 79.38
Bellhousing - aluminium 10.50 4.76
Transmission, trans mounts and power takeoff adapter 117.50 53.30
Propeller shaft - Monel 14.69 6.66
Propeller - Bronze 4.00 1.81
Battery 52.00 23.59
Fuel tanks and 20 gallons @ 6.2 lbs. / gallon 124.00 56.25
  0.00 0.00
TOTAL   1032.69 468.43
Step 5 Calculate the persons or load capacity.  This is the maximum recommended load less the weight of the installed engine and related parts.
Formula : Max Load - We
Wl = 1451.52 - 468.43
=  983.09 kg 2167.72 lbs.
Where :
Wl = Persons or load capacity.
Max Load = Weight of the engine and related equipment as calculated in Step 4.
We = Weight of the engine and related equipment as calculated in Step 4.
Step 6 Determine the swamped weight of the vessel by substituting previously calculated terms in the formula.
Formula : [ Wh * k ]   + Wd + 0.69Wf
Ws =  -126.50 + 99.79 + 0.00
=  -26.71 kg -58.89 lbs.
= 
Where :
Ws = Swamped weight (kg.)
[ Wh * k ] = Submerged  weight of various materials used in hull construction (kg.) as calculated in Step 1.
Wd = Weight of deck and superstructure (kg.) as calculated in Step 2.
Wf = Weight of permanent fittings not included in Wd (kg.) as calculated in Step 3.
Step 7 Calculate the amount of flotation required Wfl .
Formula :
Wfl = Ws + 0.75We + 0.25Wl
=  -26.71 + 0.75 * 468.43 + 0.25 * 983.09
=  -26.71 + 351.32 + 245.77
=  570.39 kg 1257.70 lbs
Where :
Wfl = Amount of flotation required.
Ws = Swamped weight as calculated in Step 6.
We = Weight of the engine and related equipment as calculated in Step 4.
Wl = Persons or load capacity as calculated in Step 5.
Step 8 Calculate the required volume of buoyant material Vb
Formula :
Vb =  Wfl / ( 1000 - Wb )
=  570.39 /  ( 1000 - 32.14 )
=  570.39 /  967.86
=  0.59 m3   20.81 ft3
Where :
Vb =  Volume of buoyant material (kg.)
Wfl = Amount of flotation as calculated in Step 6.
1000 = The factor representing a weight (kg.) of 1 m3 of fresh water.
Wb = Weight (kg.) of 1 m3 of buoyant material used.  Assuming use of polyurethane foam of 2 lbs. / ft3. ( 32.14 kg / m3 )