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Tmi 30
Designer: Halsey Herreshoff  ·  Builder: Texas Marine International  ·  First built: 1979
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About the Tmi 30

A relatively obscure entry in the sailboat world, the Tmi 30 is a vessel about which detailed documentation remains sparse, making it something of a curiosity for researchers and prospective buyers alike. What can be reasonably inferred from its 30-foot classification is that it likely sits in a versatile mid-size category, well suited to coastal cruising and daysailing with the potential for occasional offshore passages in capable hands. Boats of this size range tend to offer a practical balance between manageable single-handed or short-handed sailing and enough interior volume to accommodate a small crew for weekend adventures. Without a wealth of published specifications or a prominent racing pedigree attached to the name, the Tmi 30 may appeal most to buyers seeking an affordable entry point into keelboat ownership rather than those chasing performance benchmarks. If you are considering a Tmi 30, thorough hands-on inspection and consultation with previous owners or a qualified marine surveyor is especially recommended, given the limited publicly available data on this model's construction standards and sailing characteristics.

Core Dimensions
LOA (Length Overall) 29.92 ft / 9.12 m
LWL (Waterline Length) 26.00 ft / 7.92 m
Beam 11.00 ft / 3.35 m
Max Draft 4.92 ft / 1.50 m
Displacement 9,500.00 lb / 4,309 kg
Ballast 4,250.00 lb / 1,928 kg
Sail Area (Reported) 436.00 ft² / 40.51 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Halsey Herreshoff
Builder Texas Marine International
First Built 1979
Last Built 1981
Related Sailboats ["Seidelmann 299" · "Santana 30" · "Catalina 30" · "Hunter 30" · "Ericson 30"]
Owner Reviews

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Known Issues & What to Watch For

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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
 180
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 15.6
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 22.16
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 2.08
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.83
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 2.11
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 1.0
Rig Dimensions
I (Foretriangle Height) 37.5
J (Foretriangle Base) 11.25
P (Mainsail Luff) 38.0
E (Mainsail Foot) 11.75
SA Fore 210.94
SA Main 223.25
How It Compares

vs. Catalina 30, Hunter 30, Santana 30

This boat Similar boats
Dimensions
LOA
Tmi 30 ★
29.9 ft
Catalina 30
29.9 ft
Hunter 30
29.9 ft
Santana 30
29.9 ft
LWL
Tmi 30 ★
26.0 ft
Catalina 30
25.0 ft
Hunter 30
25.6 ft
Santana 30
25.0 ft
Beam
Tmi 30 ★
11.0 ft
Catalina 30
10.8 ft
Hunter 30
10.8 ft
Santana 30
10.0 ft
Displacement
Tmi 30 ★
9 lbs
Catalina 30
10 lbs
Hunter 30
9 lbs
Santana 30
8 lbs
Ballast
Tmi 30 ★
4 lbs
Catalina 30
4 lbs
Hunter 30
3 lbs
Santana 30
3 lbs
Sail Area
Tmi 30 ★
436 sq ft
Catalina 30
446 sq ft
Hunter 30
417 sq ft
Santana 30
414 sq ft
Performance
PHRF Rating (lower = faster)
Tmi 30 ★
180 s/nm
Catalina 30
180 s/nm
Hunter 30
189 s/nm
Santana 30
174 s/nm
SA / Displacement (higher = more powerful)
Tmi 30 ★
15.6
Catalina 30
15.2
Hunter 30
14.5
Santana 30
16.6
Ballast / Disp (higher = stiffer)
Tmi 30 ★
—
Catalina 30
41.2 %
Hunter 30
39.4 %
Santana 30
47.5 %
Comfort Ratio (higher = more comfortable offshore)
Tmi 30 ★
22.2
Catalina 30
24.9
Hunter 30
—
Santana 30
21.7
Capsize Screening (lower = safer)
Tmi 30 ★
2.08
Catalina 30
2.00
Hunter 30
—
Santana 30
2.00
Displacement / Length (lower = lighter)
Tmi 30 ★
—
Catalina 30
291
Hunter 30
264
Santana 30
228
Hull Speed
Tmi 30 ★
6.8 kts
Catalina 30
6.7 kts
Hunter 30
—
Santana 30
6.7 kts
Speed Number (higher = faster)
Tmi 30 ★
2.1
Catalina 30
1.6
Hunter 30
—
Santana 30
2.4
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