OK Dinghy Comparative Hull Offsets

by

Bob Foster AUS 722 Hull
Bob Foster AUS 722 Hull
Icebreaker hull straight out of mold
Icebreaker hull straight out of mold
Icebreaker hull
Icebreaker hull
Icebreaker
Icebreaker
Glenn Yates, Lake Macquarie, NSW, Wednesday, 6 March 2013

 

I am planning a new boat and was looking through my papers. When Bob Foster built 722 he used the data I had and a few others, he found, to create a comparison of the underwater profile. I have been able to add further to this and created this spread sheet.
No names have been attached to the boats, except my proposed one, to protect the innocent/guilty.
 
Good sailing,
Glenn

OK Dinghy Hull Offsets                            
  Unmod. Delf Mod. Delf Icebreaker Max Fry - GY Rushworth Comfort & Taylor Bob Foster AUS722
ROCKER
Baseline to transom-(200 fixed) 200 200 200 200 200 200 200
Baseline to station 1. (95 +/- 10) 96 105 105 102 99 105 104
(800mm from transom)
Baseline to station 2. (8 +/- 8) 16 16 16 15 12 14 15
(1800mm from transom)
Baseline to station 3. (28 fixed) 28 28 28 28 28 28 28
Baseline to 3500 mm from trans. 105 90 ? 97 97 93 90
(100 +/- 10)
V @ TRANSOM
Baseline to chine (247 +/- 10) 237 238 239 240 239 245 237
Difference between rocker/chine 37 38 39 40 39 45 37
Beam at transom (838+/- 10) 846 847 843 838 842 844 830
V @ Station 1. (800mm)
Baseline to chine (188 +/- 10) 197 196 194 188 194 196 196
Difference between rocker/chine 101 91 99 86 95 91 92
Beam between chines (1146 +/- 10) 1150 1141 1143 1138 1143 1150 1136
V @ STATION 2. (1800mm)
Baseline to chine (174 +/- 10) 184 181 180 180 182 184 172
Difference between rocker/chine 168 165 164 165 170 170 157
Beam between chines (1254 +/- 10) 1250 1253 1246 1248 1246 1250 1251
V @ STATION 3. (2800mm)
Baseline to chine (226 +/- 10) 216 216 218 235 230 218 230
Difference between rocker/chine 188 188 190 207 202 190 207
Beam between chines (826 +/- 10) 834 836 832 828 832 830 830
ROUNDS
Round @ Trans. (Max 15) 8 6 8 10 3 4 12
Round @ Stat. 1. (Max 25) 8 7 8 15 7 4 17
Round @ Stat. 2. (Max 30) 8 8 10 20 12 8 19
Round @ Stat. 3. (Max 35) ? 30 ? 25 19 12 25

 




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