Problems of Lamboley Test?

Problems of Lamboley-test? - there is a moot point in the interpretation of the rules of the measurement of boats class "FINN"take a part in the decision.

Make a small contribution to the decision of a disputed, select one of the options in the Survey.

If You have comments or wishes, You can leave a message in comments at the bottom of the page.

Victor Kozlov

CLASS RULES INTERPRETATIONS

H.4.5

The object of these rules is to establish a class of boats which is one-design in all matters that affect basic speed. The rules shall be interpreted in this spirit.

Since it is unlikely that these rules can cover in detail every possible eventuality, builders are strongly advised to clear doubtful points with the IFA Technical Committee before starting construction.

INTERNATIONAL FINN CLASS RULES (Page - 51)
2011 Edition - 1st March 2011
(download the document in PDF format.)

NEW BOATS

OLD BOATS

ISAF NAMBER

3664

3665

3716

3594

3219

3061

2901

2917

2935

2947

2962

2985

3044

3088

WEIGHT
(Kg)

116.1

116.2

116.1

116.3

116.2

120

120.2

120

λ
(mm)

2100

2130

2100

2102

2100

2125

2100

ρ
(mm)

1102

1110

1102

1100

1102

M · ρ²
(Kg · M²)

141

141.06

141

141.2

143.2

141.6

145.2

145.4

145.7

h
(mm)

242

244

254

239

245

234

238

242

a
(mm)

660

656

644

T1
(sec)

3.173

3.177

3.192

3.197

3.199

3.242

3.193

3.205

3.192

3.197

3.2

T2
(sec)

3.543

3.544

3.579

3.596

3.601

3.632

3.586

3.611

3.579

3.591

3.6

D.9.3

HULL WEIGHT DISTRIBUTION AND CENTRE OF GRAVITY

(a)...

(b)...

minimum

maximum

Distance λ

2100 mm

2290 mm

Distance h from underneath the hull (keel bands excluded) to the centre of gravity (see H.3)

210 mm

Radius of gyration ρ

1100 mm

INTERNATIONAL FINN CLASS RULES (Page - 28)
2011 Edition - 1st March 2011
(download the document in PDF format.)

a
(M)

0.1

0.2

0.4

0.6

0.7

0.8

1.1

1.2

1.5

T
(sec)

29.5

5.016

3.713

3.25

3.127

3.05

2.98

2.981

3.1

3.5

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T = 2π	√	a² + ρ²
		ag