Specs and Info

Pearson 10M Information Hull # 212 1978 DHP 6/15/2001, 8/28/03 Sail Number 212
PEARSON 10M
DIMENSIONS Notes: LOA = 33.05 length overall (on deck) Beam = 11.0 beam overall Draft = 5.93 draft LWL = 28.33 [1] length waterline Sail Area = 524 SF sail area (100% foretriangle) Displacement = 12,441 lbs [2] Ballast = 5,445 lbs Mast Height Above LWL = 48 BWL = 9.25 [3] beam waterline DISP CUFT = 181.53 [3] displacement in cubic feet DISP LBS S.W. = 11618 [3] displacement in lbs of salt water WA = 200.6 SQFT [3][4] wetted area of hull DESIGN RATIOS Notes: L/B = 3.0 length to beam ratio BR = 44 ballast ratio LWL/B = 2.57 waterline length to beam ratio LWL/BWL = 3.11 waterline length to waterline beam ratio OR = 14% overhang ratio (LOA-LWL)/LWL WPA = 170.4 [5] Waterplane Area WPL = 73.9 lbs/sf [5] Waterplane Loading (DISP/WPA) CWP = .65 Coefficient of the Waterline Plane itWP = 810 feet4 Moment of intertia of the Waterline Plane LBS/IN = 909 [3] weight to imerse hull 1" below DWL MT1 = 1096 FT LBS [3] Trimming Moment = moment to change trim by 1" LPS = 123 deg [6] Limit of Positive Stability Cp = 0.543 [3] prismatic coefficient LCB = 0.534 [3] longitudinal center of buoyancy VCB = -.81 [6] vertical center of buoyancy above LWL VCG = -.29 [6] vertical center of gravity above LWL SA/D = 15.6 sail area displacement ratio D/L = 245 displacement length ratio CSF = 1.9 capsize screening formula MCR = 26.3 motion comfort ratio
More info on ratios Polar Diagrams and Stability Curve Calculation of Angle of Vanishing Stability
N O T E S
[1] The LWL of the 10M is listed in different Pearson literature as 28'4" and 29'2". The line drawing (Pearson drawing #1953) says 28'4" and the LWL does measure 28'4" on the drawing. 28'4" is the dimension used here for all calculations that involve LWL. For an LWL of 29'2" the following design ratios would be different:
D/L = 224,     LWL/B = 2.65,     LWL/BWL = 3.21,     OR = 12%,     MCR = 25.8


[2] This displacement figure (12,441 lbs) is the published number in Pearson literature. If this is the displacement for boats equipped with the A4 engine Volvo diesel boats can be assumed to be roughly 200 lbs heavier.
USYRA measurment data for five 10M's weighed for IMS gives weights ranging from 12,048 to 13,143. These boats would have D/L ratios ranging from 237 to 258.

[3] These figures are taken from Pearson drawing #1953.    If you know what some of these abreiviations mean
email me.

[4] I think the wetted area of the hull does not include the keel and rudder area. They would add about 66 sqft to make the total wetted surface about 266 sf. That would be the figure needed for bottom paint calculations.

[5]
Waterplane loading is a good indicator of comfort in a seaway (See "The Nature of Boats" by David Gerr, Ch 14). The lower the waterplane loading the faster the heave acceleration. That means the boat will bob up and down faster and be more uncomfortable. The 10M is well into Gerr's comfortable range.

[6] These figures are from a
USYRA stability report for a particular 10M measured for MHS (early IMS). Also see the page on Angle of Vanishing Stability (AVS).

10M PHRF Ratings
Ratings vary between regions based on prevailing conditions and within regions based on boat equipment.
Boat Average New
England
Narragansett Long
Island
Sound
Eastern
CT
W-LIS Mid
Atlantic
Chesapeake Lake
Michigan
Detroit Austin YC Northern
California
So CA Schell
Regression
Formula
  spin jam spin spin jam spin spin Jam spin spin spin spin jam spin spin spin spin spin
10M 146.3 168.3 141 150 173 150  147 170 150 150 156 144 162     144 144 147
10MTM 143.3   135     150      150             144 144 137
Average rating does not include Schell regression formula rating.
Ratings for all Pearsons
MAST
  Mast height from water = 48' (TM 50')
  Top of antena from water = 52'
    Extrusion Specs
      Extrusion - Sound Spars 8755 Mast Section: SS-8755MB, tapered
      Dimensions (extrusion only)
        length              49.6' (TM 51.5')
        overall size        8.75" x 5.5"
        sail track          5/8"
        wall thickness      0.16"
        weight              4.8 lb/ft = 238 lbs
        moments of inertia  16, 33 in^4

  Spreaders - aluminum airfoil sections
    length =  38-1/2" (-1/2 to wire center)
    width = 4-1/2" tapers to 2-1/4" stating 14" from base
    thickness = 1-1/2" tapers to 1/2" stating 14" from base
  The spreaders may be RigRite SP450.

  sheaves - aluminum with bronze bushings
    overall diameter      3.75"
    diameter at groove    3.25"
    thickness             0.625"
    bushing OD (apr)      0.65"
    bushing ID            0.518" [7]
    shaft diameter        0.500" 
[7]Measurement after 24 years of service

BOOM
 actual measured dimensions (extrusion only)
  Wall thickness  
	   Overall	Inside
  length    11'4"
  height     6"
  width	     4"

  length to forward edge of stripe 
  sail track  slot width

WINCHES
  2 Lewmar #8 halyard
  2 Lewmar #43 2 speed sheet

RIGGING (as specefied in the 1977 parts catalog)
  Wire           Type  Diam  Length [8]  pin-to-pin [9]
  Headstay       1x19   3/8   43.438       45.17
  Backstay       1x19   3/8   44.813       46.36
  Upper Shrouds  1x19  5/16   40.771       41.96 
  Lowers         1x19  9/32   21.666       22.88
  Fwd Lowers     1x19  9/32   21.708       22.95
  Topping Lift   7x19    
[8] length of wire only, no turnbuckles or toggles (from Pearson parts catalog) - This will be correct only for the OEM Navtec turnbuckles
[9] As measured on hull #212 after careful rig tuning (fall 2001), pin-to-pin is chainplate to mast fitting including toggles and at pin centers.
 TURNBUCLES		  Size
  Headstay  		 
  Backstay (base) 	 
  Shrouds  	 	

10M #212 CLEVIS PIN SIZES
 CLEVIS PINS              Diameter    Length
  headstay                5/8"        1"
  backstay                5/8"        1"
  upper shrouds top       5/8"        1"
  upper shrouds bottom    5/8"        7/8"
  lower shrouds top       1/2"        3/4"
  lower shrouds bottom    1/2"        7/8"


 RUNNING
  Line          Size    Length
  main H         3/8     83'
  jib H          3/8     90'
  spin H         3/8     90'
  outhaul       
  traveler      
  topping L     
  pole lift     
  pole DH       
  mainsheet      1/2     82'
  jib sheet      7/16    40'
  genoa sheet    7/16    48'
  spin sheet             66'
  asym sheets            75'

  Note: Halyard lengths are at the mast.  Add about 14' to run back to cockpit.
 
KEEL
 Lead
 Weight 5445 lbs
 5/8" Bolts 
 Torque 70 lb-ft [10]
[10] Source: Bill Shaw in Pearson Current news letter Vol. 4 #3, 1998.


RUDDER
 Construction

 Actual measured dimensions
  Shaft OD = 1.5"      

Sail Dimension Information
All dimensions in feet.

Mast height from water = 48' (50' TM)
Standard       #212       Tall Mast    Tall Mast/Sprit [11] 
I = 44.0'    I = 44.5'    I = 46.0'    I = 46.0'      
J = 14.2'    J = 14.2'    J = 14.2'    J = 15.5'
P = 38.5'    P = 38.5'    P = 40.5'    P = 40.5'
E = 11.0'    E = 11.0'    E = 11.0'    E = 11.0'
SA= 524sf    SA= 528sf    SA= 549sf    SA= 579sf   (sail area)
MA= 212sf    MA= 212sf    MA= 223sf    MA= 223sf   (main area)
FA= 312sf    FA= 316sf    FA= 327sf    FA= 357sf   (100% fore triangle area)

[11] Sprit was factory option.  It added about 15" to the J dimension.  Not sure about exact measurement. (photo)


SAIL    LUFF    LEECH    FOOT    LP     AREA    %J      Wt
Main    38.5             11.0            212    
#1      42.0     41.0    21.7   20.6     433   145
#2      
#3      40.7     34.0    16.3   13.4     272    94     7.5
WJib     
Drift   

Spin	

Spinnaker Dimensions by IOR formula:
Max Girth = 1.8 x J = 1.8 x 14.2' = 25.56'
Luff = .95 x (J^2 + I^2)^1/2 
     = .95 x (14.2^2 + 44.0^2)^1/2
     = 43.92'



S Y S T E M S
HEAD Jabsco 29120-0000 Repair parts kit #29045-0000? W&C (213)632-2600 Intake 3/4" ID hose to seacock under head sink HOLDING TANK 12 gallons Hose Fittings: ?? L=24" W=13.9" H=9.75" WATER TANKS Forward Rectangular 23.5 gallons (apr) 1-1/4" filler hose fitting 5/8" drain and vent hose fittings L=36" W=17.25" H=9" Port/Starboard The ends are triangular with a slightly convex side (on the hull), with two baffles inside. 25 gallons each (apr calculated from dimensions) 1-1/4 filler hose fitting? 5/8" drain and vent hose fittings? L=49.5 W(fwd)=20 H(fwd)=10.5 W(aft)=24 H(aft)=11 Total capacity 23.5 + 25 + 25 + 6 (water heater) = 79 gallons (56 without fwd tank) POWER ELECTRICAL BATTERIES 2 group 27 deep cycle Astro Lite 27DCM COMBO reserve capacity 165 cranking amps 750 march 2000 install date
D R I V E T R A I N
Engine Volvo MD11C diesel 2 cylender hp = 23 @ 2500 RPM Oil Filter Fram PH3614 weight = 505 lbs Transmission Volvo Monoshift (no reduction, w/reverse gear) V-Drive Walter RV-10 SN 33097 (back-up SN 36615) 2:1 reduction gear Flange Dimension Overall diameter = 2.875 Counter bore = 1.250 - female on coupling bolt circle = 1.875 - 3 bolts Spicer bearing kit Dana 5-170X G200208190126 - SLK UPC 7 25975 11520 6 Upper Seal National Federal - Mogul Oil Seals 471765 1.187 x 2.000 x 0.250 Numbers from parts in v-drive SN 33097 Upper shaft bearings #14 Timken 17244 outer race Timken 17118 inner race #14A race marked Timken 07204 Lower shaft bearings #15 NACHI 5304 (replacement sent by Walter) 15A race marked Timken 07204 Output Shaft Seal #8 WP 15104-LBS marked on seal Propeller Shaft hull #212, Volvo MD11C with Walter V-Drive diameter = 1-1/8" material = Aquamet 19 stainless steel (oem was bronze) lenght to small end of taper = 49-5/8" thread length = 1-1/16" (to fit J-Prop feathering propeller) thread = 3/4x10tpi cutlass bearing = 1-1/8 ID, 1-1/2 OD, 4-1/2 long Stuffing Box ( hull 212 with 1-1/8" diameter prop shaft) packing size = 3/16" Packing length = apr 4-3/8", 24" will make 5 pieces, 4 fit in gland Stuffing Box Hose = 2-1/4" ID Hoses intake to strainer 3/4" strainer to v-drive 5/8" v-drive to water pump 5/8" water heater 5/8" engine to exhaust riser 5/8" exhaust elbow to muffler 1-5/8" exhaust muffler to stern 1-1/2"
Stanchions Stanchion position - deck angle #1 - 6 degrees #2 - 6 degrees #3 - 7 degrees #4 - 10 degrees +/- 1 degree Stanchion positions are moving aft Angle of stanchion bases Two with 3 degree angle four with 6 degree angle two with 9 degree angle