Seaswirl 1851 Dual Console O/B 2006 vs Seaswirl 2101 Dual Console I/O 2006 - Boat Spec Comparison

Q: Which is the larger boat — the Seaswirl 1851 Dual Console O/B 2006 or the Seaswirl 2101 Dual Console I/O 2006?

The Seaswirl 2101 Dual Console I/O 2006 is the longer of the two at 21,0 feet overall. The Seaswirl 1851 Dual Console O/B 2006 comes in at 18,0 feet, making it roughly 3,0 ft shorter — a meaningful difference in deck room and overall on-water presence.

Q: What is the maximum horsepower rating for these boats?

The Seaswirl 1851 Dual Console O/B 2006 has a documented max rating of 175 hp. Engine specifications for the Seaswirl 2101 Dual Console I/O 2006 were not available in our database — check the OEM spec sheet or manufacturer's website for confirmation.

Q: How many people can each boat hold?

The Seaswirl 1851 Dual Console O/B 2006 is Coast Guard rated for 5 passengers, while the Seaswirl 2101 Dual Console I/O 2006 is certified for 6. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Q: Which boat is wider, and does it affect trailering?

The Seaswirl 2101 Dual Console I/O 2006 measures 102" wide, compared to 9" for the Seaswirl 1851 Dual Console O/B 2006. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Q: Which boat has the larger fuel tank — the Seaswirl 1851 Dual Console O/B 2006 or the Seaswirl 2101 Dual Console I/O 2006?

The Seaswirl 2101 Dual Console I/O 2006 has the bigger tank at 105 gallons, versus 62 gallons on the Seaswirl 1851 Dual Console O/B 2006. That 43-gallon difference translates to roughly 129–215 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Seaswirl 1851 Dual Console O/B 2006 and Seaswirl 2101 Dual Console I/O 2006 from the same manufacturer?

Yes — both the Seaswirl 1851 Dual Console O/B 2006 and the Seaswirl 2101 Dual Console I/O 2006 are built by Seaswirl. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

Boat Comparison

Seaswirl 1851 Dual Console O/B 2006 vs Seaswirl 2101 Dual Console I/O 2006

Seaswirl

Seaswirl 1851 Dual Console O/B 2006

2006

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Seaswirl

Seaswirl 2101 Dual Console I/O 2006

2006

View full specs →

Detailed Evaluation & Buyer Recommendation

Seaswirl 1851 Dual Console O/B 2006 vs Seaswirl 2101 Dual Console I/O 2006 — Same Brand, Different Boat

The Seaswirl 1851 Dual Console O/B 2006 vs Seaswirl 2101 Dual Console I/O 2006 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.

The Seaswirl 1851 Dual Console O/B 2006 carries a rated maximum of 175 hp. Engine data for the Seaswirl 2101 Dual Console I/O 2006 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Seaswirl 2101 Dual Console I/O 2006 carries 105 gallons versus 62 gallons in the Seaswirl 1851 Dual Console O/B 2006. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Seaswirl 2101 Dual Console I/O 2006 is rated for 6 passengers, while the Seaswirl 1851 Dual Console O/B 2006 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Seaswirl 2101 Dual Console I/O 2006 could be the deciding factor.

Bottom line: Choose the Seaswirl 2101 Dual Console I/O 2006 if your priority is putting more people on the water — it handles 6 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Seaswirl 1851 Dual Console O/B 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.

General Boat Info

MakeSeaswirl

Model1851 Dual Console O/B

Model2101 Dual Console I/O

Model Year2006

Measurements / Dimensions

Beam90 in. (2.29 m)

Beam102 in. (2.59 m)

Beam - Meters2.29

Beam - Meters2.59

Beam - Inches9

Beam - Inches102

Bridge clearance - Detail51 in. (1.30 m)

Bridge clearance - Detail62 in. (1.57 m)

Bridge clearance - Meters1.3

Bridge clearance - Meters1.57

Bridge clearance - Inches51

Bridge clearance - Inches62

Deadrise20℃

Draft [drive up] - Detail14 in. (.35 m)

Draft [drive up] - Detailnot available

Draft [drive up] meters0.36

Draft [drive up] metersnot available

Draft [drive up] inches14

Draft [drive up] inchesnot available

Draft [max] - Detail30 in. (.76 m)

Draft [max] - Detailnot available

Draft [max] - Meters0.76

Draft [max] - Metersnot available

Draft [max] - Inches3

Draft [max] - Inchesnot available

Weight - Detailw/ standard engine: 2,550 lbs. (1,157 kg)

Weight - Detailnot available

Weight - kg1156.66

Weight - kgnot available

Weight - lbs.255

Weight - lbs.not available

Length - Meters5.64

Length - Meters6.55

Length - Feet18

Length - Feet21

Length - Inches6

Length overall - Detail18 ft. 6 in. (5.64 m)

Length overall - Detail21 ft. 6 in. (6.55 m)

Length overall - Meters5.64

Length overall - Meters6.55

Length overall - Inches222

Length overall - Inches258

Engine and Drivetrain

Fuel tank capacity - Detail62 gal. (235 l)

Fuel tank capacity - Detail105 gal. (397 l)

Fuel tank capacity - Liters234.7

Fuel tank capacity - Liters397.47

Fuel tank capacity - Gal62

Fuel tank capacity - Gal105

Fuel typeGas

Fuel typeGas or diesel

Drive typeOutboard

Drive typeI/O

Engine max175 hp (130 kw) Standard: 115 hp (86 kw)

Engine maxnot available

Operational Info

Maximum capacity1,900 lbs. (862 kg)

Maximum capacitynot available

Seaswirl 1851 Dual Console O/B 2006 vs Seaswirl 2101 Dual Console I/O 2006 — Common Questions

Which is the larger boat — the Seaswirl 1851 Dual Console O/B 2006 or the Seaswirl 2101 Dual Console I/O 2006?

The Seaswirl 2101 Dual Console I/O 2006 is the longer of the two at 21,0 feet overall. The Seaswirl 1851 Dual Console O/B 2006 comes in at 18,0 feet, making it roughly 3,0 ft shorter — a meaningful difference in deck room and overall on-water presence.

What is the maximum horsepower rating for these boats?

The Seaswirl 1851 Dual Console O/B 2006 has a documented max rating of 175 hp. Engine specifications for the Seaswirl 2101 Dual Console I/O 2006 were not available in our database — check the OEM spec sheet or manufacturer's website for confirmation.

How many people can each boat hold?

The Seaswirl 1851 Dual Console O/B 2006 is Coast Guard rated for 5 passengers, while the Seaswirl 2101 Dual Console I/O 2006 is certified for 6. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Which boat is wider, and does it affect trailering?

The Seaswirl 2101 Dual Console I/O 2006 measures 102" wide, compared to 9" for the Seaswirl 1851 Dual Console O/B 2006. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Which boat has the larger fuel tank — the Seaswirl 1851 Dual Console O/B 2006 or the Seaswirl 2101 Dual Console I/O 2006?

The Seaswirl 2101 Dual Console I/O 2006 has the bigger tank at 105 gallons, versus 62 gallons on the Seaswirl 1851 Dual Console O/B 2006. That 43-gallon difference translates to roughly 129–215 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Seaswirl 1851 Dual Console O/B 2006 and Seaswirl 2101 Dual Console I/O 2006 from the same manufacturer?

Yes — both the Seaswirl 1851 Dual Console O/B 2006 and the Seaswirl 2101 Dual Console I/O 2006 are built by Seaswirl. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

← Seaswirl 1851 Dual Console O/B 2006 full specs ← Seaswirl 2101 Dual Console I/O 2006 full specs