Gravesend Bay Knockabout

1908 — 1918
Designer
John R. Brophy
Builder
William Wall
Associations
?
# Built
?
Hull Type
Centerboard Dinghy
Construction
Wood planked

Dimensions

Length Overall
20 11 / 6.4 m
Waterline Length
17 5 / 5.3 m
Beam
60 0 / 18.3 m
Draft
0 7 / 0.2 m 4 5 / 1.4 m
Displacement
1,100 lbs / 499 kg
Ballast
?
drawing

Rig and Sails

Type
Gaffhead Sloop
Reported Sail Area
249 ft2 / 23.1 m2
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Mast Height
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
5.59 knots
Sail Area/Displacement
37.39
high performance
Ballast/Displacement
?
Displacement/Length
92.9
Ultralight
Comfort Ratio
0.39
lightweight racing boat
Capsize Screening
23.25
better suited for coastal cruising

Notes

Built for members of the New York Canoe Club and raced in New York Harbor up until the 1920’s. (Specific dates are unknown).
Locally known as CLASS X. Not strictly a one design class but boats were similar.
(Disp. is an estimate)
Related article appeared in ‘The Rudder’, Dec. 1916.
(Today Gravesend (Bay)is a neighborhood in the borough of Brooklyn, NY,NY)


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