I'm no longer an official but for the general public I will give the answers in this post. I refer to John Alani for the official answers to the SCHRS committee ;


F16 specs (unchanged)

Daggerboards = yes
Overall length = max 5.00 mtr as measured on the hulls between extremities excl. pintles.
Spinnaker area = max 17.5 sq. mtr. as measured by the Texel/ISAF rules.
Crew = either MIN. 1 or 2 sailors depending on configuration (as in without or with jib).

Overall boat weight 1-up = min. 104 kg
overall boat weight 2-up = min. 107 kg

Daggerboard area = 0.2 sq. mtr.
daggerboard length = 0.70 mtr.

This results in a daggerboard of aspect ratio 2.45.



New (Changed) specs F16 (post april 2005)

Mainsail actual area = max. 15.00 sq. mtr. (as measured by Texel/ISAF rules)
Mainsail luff length = max. 8.10 mtr (after applying full downhaul tension as per Texel/ISAF rules)

Jibsail actual area = max. 3.70 sq. mtr. (as measured by Texel/ISAF rules)
Jibsail luff OR leech length = max. 6.00 mtr (as measued by Texel/ISAF rules)

However I have yet to know a single F16 that goes over 5.50 mtr on the jib luff/leech. Our hound fitting height is limiting our jibs to these max. actual measurements.




The F16 class rules don't rule on the daggerboard dimensions. So we can't provide hard data on that. Last time the SCHRS committee agreed to take the average of the F16 boats at that time. This included the Taipan 4.9, Bim 16 and Stealth R. This resulted in the data :

Daggerboard area = 0.2 sq. mtr.
daggerboard length = 0.70 mtr.
aspect ratio 2.45.


Both the Taipan and Blade designs use less daggerboard area and much less daggerboard length resulting in a lower aspect ratio of 1.9 which is less then the given 2.45. So in that sense their performance is overestimated by the specs given above. The Stealth F16 uses slightly less board area and a slightly more length and comes out at a aspect ratio of exactly 3. The Bim design was eventually dropped from the F16 class so we won't look at that one again. The G-cat F16 doesn't have daggerboards so we'll leave that one out of this analysis as well.

The average value between the three F16 boats included is : (1.9 + 3) / 2 = 2.45

So I feel the average value agreed upon earlier is still applicable.

If the SCHR committee does not agree with that then I propose they use the dimensions of the Stealth F16 instead =

0.1875 by 0.75 mtr aspect ratio = 3

This is the most performant daggerboard specs (under SCHRS handicap math) of all F16's even though 75 % of the F16 class is using boards that are nowhere near those specs.

For example the Taipan/Blade daggerboards are 0.1595 by 0.55 = aspect ratio = 1.9


I hope this helps.


Wouter

OK, It's done. The results have been amended on Marconi's web site using 0.98 for the Stealth F16 1-up.

http://www.marconi-sc.org.uk/661D9/East_...sults_2006.aspx

Droped to 2nd and left cursing running aground at Thirstle and every other little hicup over the course.
Interestingly a 0.99 would have created a dead heat.

OK, It's done. The results have been amended on Marconi's web site using 0.98 for the Stealth F16 1-up.

http://www.marconi-sc.org.uk/661D9/East_...sults_2006.aspx

Droped to 2nd and left cursing running aground at Thirstle and every other little hicup over the course.
Interestingly a 0.99 would have created a dead heat.

Good sportsmanship Aaron!

Should give you a nice warm feeling inside....<img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />