Tartan 37/40/43 Ballast

[deluxe68]

We are looking for a cruising boat and noticed something peculiar about the ballast weights used on the deep fin keeled Tartans. The 3700 displaces 15950 lbs and has a 6000 lb ballast for a 37% ratio. The 4000 displaces 18854 but only has a 5500 keel for a 29% ratio. The 4300 displaces 21775 with a 6750 lb keel for a 30% ratio. All 3 have similar SAD's (22), I cannot figure out why the bigger boats do not have a heavier keel. What am I missing? All 3 were designed by the same guy.

[GordMay]

All by Sparkman & Stephens, except as noted.

Tartan 43 ➥ TARTAN 43 sailboat specifications and details on sailboatdata.com
Displ. 17800 lbs./ 8074 kgs.
Ballast: 9200 lbs. / 4173 kgs. (.516)
SA/Disp.: 18.33
Bal./Disp.: 51.68%
Disp./Len.: 233.63

Tartan 41 ➥ TARTAN 41 sailboat specifications and details on sailboatdata.com
Disp. 17850 lbs./ 8097 kgs.
Ballast: 9200 lbs. / 4173 kgs.
SA/Disp.: 17.05
Bal./Disp.: 51.54%
Disp./Len.: 228.53

Tartan 40 ➥ TARTAN 40 sailboat specifications and details on sailboatdata.com
Disp. 17250 lbs./ 7825 kgs.
Ballast: 7600 lbs. / 3447 kgs.
SA/Disp.: 17.46
Bal./Disp.: 44.05%
Disp./Len.: 244.51

Ted Hood’s Tartan 37-1 ➥ TARTAN 37-1 sailboat specifications and details on sailboatdata.com
Disp. 14600 lbs./ 6623 kgs.
Ballast: 4200 lbs. / 1905 kgs.
SA/Disp.: 17.58
Bal./Disp.: 28.76%
Disp./Len.: 393.08

Tartan 37-2K ➥ TARTAN 37-2 K sailboat specifications and details on sailboatdata.com
Disp. 15500 lbs./ 7031 kgs.
Ballast: 7500 lbs. / 3402 kgs.
SA/Disp.: 15.42
Bal./Disp.: 48.39%
Disp./Len.: 298.92

Tartan 37-2 ➥ TARTAN 37-2 sailboat specifications and details on sailboatdata.com
Disp. 15500 lbs./ 7031 kgs.
Ballast: 7500 lbs. / 3402 kgs.
SA/Disp.: 15.42
Bal./Disp.: 48.39%
Disp./Len.: 298.92

[deluxe68]

Originally Posted by GordMay

All by Sparkman & Stephens, except as noted.

Tartan 43 ➥ TARTAN 43 sailboat specifications and details on sailboatdata.com
Displ. 17800 lbs./ 8074 kgs.
Ballast: 9200 lbs. / 4173 kgs. (.516)
SA/Disp.: 18.33
Bal./Disp.: 51.68%
Disp./Len.: 233.63

Tartan 41 ➥ TARTAN 41 sailboat specifications and details on sailboatdata.com
Disp. 17850 lbs./ 8097 kgs.
Ballast: 9200 lbs. / 4173 kgs.
SA/Disp.: 17.05
Bal./Disp.: 51.54%
Disp./Len.: 228.53

Tartan 40 ➥ TARTAN 40 sailboat specifications and details on sailboatdata.com
Disp. 17250 lbs./ 7825 kgs.
Ballast: 7600 lbs. / 3447 kgs.
SA/Disp.: 17.46
Bal./Disp.: 44.05%
Disp./Len.: 244.51

Ted Hood’s Tartan 37-1 ➥ TARTAN 37-1 sailboat specifications and details on sailboatdata.com
Disp. 14600 lbs./ 6623 kgs.
Ballast: 4200 lbs. / 1905 kgs.
SA/Disp.: 17.58
Bal./Disp.: 28.76%
Disp./Len.: 393.08

Tartan 37-2K ➥ TARTAN 37-2 K sailboat specifications and details on sailboatdata.com
Disp. 15500 lbs./ 7031 kgs.
Ballast: 7500 lbs. / 3402 kgs.
SA/Disp.: 15.42
Bal./Disp.: 48.39%
Disp./Len.: 298.92

Tartan 37-2 ➥ TARTAN 37-2 sailboat specifications and details on sailboatdata.com
Disp. 15500 lbs./ 7031 kgs.
Ballast: 7500 lbs. / 3402 kgs.
SA/Disp.: 15.42
Bal./Disp.: 48.39%
Disp./Len.: 298.92

I am not referring to the older S&S designs, I should have had the thread title as "Tartan 3700/4000/4300 Ballast". The specs I listed are for brand new boats.