Duckworth Magnum Inboard 21 ft. 2007 vs Duckworth Ultra Magnum Inboard Jet 23 2013 - Boat Spec Comparison

Q: Which is the larger boat - the Duckworth Magnum Inboard 21 ft. 2007 or the Duckworth Ultra Magnum Inboard Jet 23 2013?

The Duckworth Ultra Magnum Inboard Jet 23 2013 is the longer of the two at 23,0 feet overall. The Duckworth Magnum Inboard 21 ft. 2007 comes in at 21,0 feet, making it roughly 2,0 ft shorter - a meaningful difference in deck room and overall on-water presence.

Q: How many people can each boat hold?

The Duckworth Magnum Inboard 21 ft. 2007 is Coast Guard rated for 6 passengers, while the Duckworth Ultra Magnum Inboard Jet 23 2013 is certified for 7. 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: Do these boats require an oversize trailer permit to tow on US highways?

Both the Duckworth Magnum Inboard 21 ft. 2007 and Duckworth Ultra Magnum Inboard Jet 23 2013 share an 102 in. beam - meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.

Q: Which boat has the larger fuel tank - the Duckworth Magnum Inboard 21 ft. 2007 or the Duckworth Ultra Magnum Inboard Jet 23 2013?

The Duckworth Ultra Magnum Inboard Jet 23 2013 has the bigger tank at 80 gallons, versus 62 gallons on the Duckworth Magnum Inboard 21 ft. 2007. That 18-gallon difference translates to roughly 54–90 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Duckworth Magnum Inboard 21 ft. 2007 and Duckworth Ultra Magnum Inboard Jet 23 2013 from the same manufacturer?

Yes - both the Duckworth Magnum Inboard 21 ft. 2007 and the Duckworth Ultra Magnum Inboard Jet 23 2013 are built by Duckworth. 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

Duckworth Magnum Inboard 21 ft. 2007 vs Duckworth Ultra Magnum Inboard Jet 23 2013

Duckworth

Duckworth Magnum Inboard 21 ft. 2007

2007

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Duckworth

Duckworth Ultra Magnum Inboard Jet 23 2013

2013

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Detailed Evaluation & Buyer Recommendation

Duckworth Magnum Inboard 21 ft. 2007 vs Duckworth Ultra Magnum Inboard Jet 23 2013: A Close Look at Two Deep-V Boats

Both the Duckworth Magnum Inboard 21 ft. 2007 and the Duckworth Ultra Magnum Inboard Jet 23 2013 are deep-V designs, both built in aluminium, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

For family outings this is probably the sharpest distinction between the two. The Duckworth Ultra Magnum Inboard Jet 23 2013 is rated for 7 passengers, while the Duckworth Magnum Inboard 21 ft. 2007 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Duckworth Ultra Magnum Inboard Jet 23 2013 could be the deciding factor.

Bottom line: Choose the Duckworth Ultra Magnum Inboard Jet 23 2013 if your priority is putting more people on the water - it handles 7 passengers and at 23,0 ft it has the deck room to back that rating up comfortably. The Duckworth Magnum Inboard 21 ft. 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.

General Boat Info

MakeDuckworth

ModelMagnum Inboard 21 ft.

ModelUltra Magnum Inboard Jet 23

Model Year2007

Model Year2013

Measurements / Dimensions

Beam102 in.

Beam - Meters2.59

Beam - Inches102

Deadrise14℃ at transom

DeadriseTransom: 12°

Width [transom] - Detail78 in.

Width [transom] - Detail84 in.

Height - Detail36 in.

Height - DetailSides: 36 in.

Height - Meters0.91

Height - Inches36

Length - Feet21

Length - Feet23

Length overall - Detail21 ft. 0 in.

Length overall - Detail23 ft.

Length overall - Meters6.4

Length overall - Meters7.01

Length overall - Inches252

Length overall - Inches276

Weight - Detailnot available

Weight - Detail3,610 lbs.

Weight - kgnot available

Weight - kg1637.47

Weight - lbs.not available

Weight - lbs.3610

Body / Hull

Hull materialAluminum

Hull thickness0.125 in.

Hull thicknessBottom: 0.190 in. 5086-H116 Sides: 0.125 in. 5052-H32

Hull typeDeep vee

Hull typeDeep Vee

Engine and Drivetrain

Engine/s standardGM 350 V-8

Engine/s standardnot available

Fuel tank capacity - Detail62 gal.

Fuel tank capacity - Detail80 gal.

Fuel tank capacity - Liters234.7

Fuel tank capacity - Liters302.83

Fuel tank capacity - Gal62

Fuel tank capacity - Gal80

Fuel typeGas

Drive typeInboard

Engine modelnot available

Engine model6.0 l MEFI-5 (catalyzed)

Impellernot available

ImpellerTurbo

Jet pumpnot available

Jet pumpHamilton 212

Duckworth Magnum Inboard 21 ft. 2007 vs Duckworth Ultra Magnum Inboard Jet 23 2013 - Common Questions

Which is the larger boat - the Duckworth Magnum Inboard 21 ft. 2007 or the Duckworth Ultra Magnum Inboard Jet 23 2013?

The Duckworth Ultra Magnum Inboard Jet 23 2013 is the longer of the two at 23,0 feet overall. The Duckworth Magnum Inboard 21 ft. 2007 comes in at 21,0 feet, making it roughly 2,0 ft shorter - a meaningful difference in deck room and overall on-water presence.

How many people can each boat hold?

The Duckworth Magnum Inboard 21 ft. 2007 is Coast Guard rated for 6 passengers, while the Duckworth Ultra Magnum Inboard Jet 23 2013 is certified for 7. 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.

Do these boats require an oversize trailer permit to tow on US highways?

Both the Duckworth Magnum Inboard 21 ft. 2007 and Duckworth Ultra Magnum Inboard Jet 23 2013 share an 102 in. beam - meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.

Which boat has the larger fuel tank - the Duckworth Magnum Inboard 21 ft. 2007 or the Duckworth Ultra Magnum Inboard Jet 23 2013?

The Duckworth Ultra Magnum Inboard Jet 23 2013 has the bigger tank at 80 gallons, versus 62 gallons on the Duckworth Magnum Inboard 21 ft. 2007. That 18-gallon difference translates to roughly 54–90 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Duckworth Magnum Inboard 21 ft. 2007 and Duckworth Ultra Magnum Inboard Jet 23 2013 from the same manufacturer?

Yes - both the Duckworth Magnum Inboard 21 ft. 2007 and the Duckworth Ultra Magnum Inboard Jet 23 2013 are built by Duckworth. 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.

← Duckworth Magnum Inboard 21 ft. 2007 full specs ← Duckworth Ultra Magnum Inboard Jet 23 2013 full specs