Monachus Yachts 70 2021 vs Monachus Yachts Issa 45 Fly 2021 - Boat Spec Comparison

Q: Which is the larger boat — the Monachus Yachts 70 2021 or the Monachus Yachts Issa 45 Fly 2021?

The Monachus Yachts 70 2021 is the longer of the two at 70,0 feet overall. The Monachus Yachts Issa 45 Fly 2021 comes in at 47,0 feet, making it roughly 23,0 ft shorter — a meaningful difference in deck room and overall on-water presence.

Q: Which boat can handle a bigger outboard?

The Monachus Yachts 70 2021 is rated to a maximum of 900 hp, giving it the larger power ceiling. The Monachus Yachts Issa 45 Fly 2021 tops out at 400 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

Q: How many people can each boat hold?

The Monachus Yachts 70 2021 is Coast Guard rated for 21 passengers, while the Monachus Yachts Issa 45 Fly 2021 is certified for 14. 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 Monachus Yachts 70 2021 and Monachus Yachts Issa 45 Fly 2021 share an 14.00 ft 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 Monachus Yachts 70 2021 or the Monachus Yachts Issa 45 Fly 2021?

The Monachus Yachts 70 2021 has the bigger tank at 951 gallons, versus 422 gallons on the Monachus Yachts Issa 45 Fly 2021. That 529-gallon difference translates to roughly 1587–2645 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Monachus Yachts 70 2021 and Monachus Yachts Issa 45 Fly 2021 from the same manufacturer?

Yes — both the Monachus Yachts 70 2021 and the Monachus Yachts Issa 45 Fly 2021 are built by Monachus Yachts. 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

Monachus Yachts 70 2021 vs Monachus Yachts Issa 45 Fly 2021

Monachus Yachts

Monachus Yachts 70 2021

2021

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Monachus Yachts

Monachus Yachts Issa 45 Fly 2021

2021

View full specs →

Detailed Evaluation & Buyer Recommendation

Monachus Yachts 70 2021 vs Monachus Yachts Issa 45 Fly 2021 — Same Brand, Different Boat

The Monachus Yachts 70 2021 vs Monachus Yachts Issa 45 Fly 2021 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 power gap is worth calling out. Rated to 900 hp, the Monachus Yachts 70 2021 has a 500-hp advantage over the Monachus Yachts Issa 45 Fly 2021's 400-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Monachus Yachts 70 2021 carries 951 gallons versus 422 gallons in the Monachus Yachts Issa 45 Fly 2021. 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 Monachus Yachts 70 2021 is rated for 21 passengers, while the Monachus Yachts Issa 45 Fly 2021 caps at 14. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Monachus Yachts 70 2021 could be the deciding factor.

Bottom line: Choose the Monachus Yachts 70 2021 if your priority is putting more people on the water — it handles 21 passengers and at 70,0 ft it has the deck room to back that rating up comfortably. The Monachus Yachts Issa 45 Fly 2021 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 14 that costs less to run day-to-day.

Measurements / Dimensions

Length overall - Detail70.00 ft

Length overall - Detail47.00 ft

Length - Feet70

Length - Feet47

Length overall - Meters21.34

Length overall - Meters14.33

Length overall - Inches840

Length overall - Inches564

Beam14.00 ft

Beam - Meters4.27

Beam - Inches168

Draft [max] - Detail3.70 ft

Draft [max] - Meters1.13

Draft [max] - Inches44

Engine and Drivetrain

Fuel tank capacity - Gal951

Fuel tank capacity - Gal422

Fuel tank capacity - Liters3599.92

Fuel tank capacity - Liters1597.44

Engine makeVolvo Penta

Engine makeIVECO

Engine modelD13 IPS 12

Engine modelnot available

Horsepower900 hp

Horsepower400 hp

Engine 2 Engine MakeVolvo Penta

Engine 2 Engine MakeIVECO

Engine 2 Engine ModelD13 IPS 12

Engine 2 Engine Modelnot available

Engine 2 Horsepower900 hp

Engine 2 Horsepower400 hp

Performance

Cruising speed27

Cruising speed23

Cruising speed measureknots

Maximum speed32

Maximum speed28

Maximum speed measureknots

Operational Info

Sleeping capacity6

Sleeping capacity4

Cabins3

Cabins2

Head3

Head2

Water capacity317

Water capacity198

Holding tank capacity - Gal265

Holding tank capacity - Gal105

Holding tank capacity - Liters1003.13

Holding tank capacity - Liters397.47

Boat typePower

Monachus Yachts 70 2021 vs Monachus Yachts Issa 45 Fly 2021 — Common Questions

Which is the larger boat — the Monachus Yachts 70 2021 or the Monachus Yachts Issa 45 Fly 2021?

The Monachus Yachts 70 2021 is the longer of the two at 70,0 feet overall. The Monachus Yachts Issa 45 Fly 2021 comes in at 47,0 feet, making it roughly 23,0 ft shorter — a meaningful difference in deck room and overall on-water presence.

Which boat can handle a bigger outboard?

The Monachus Yachts 70 2021 is rated to a maximum of 900 hp, giving it the larger power ceiling. The Monachus Yachts Issa 45 Fly 2021 tops out at 400 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

How many people can each boat hold?

The Monachus Yachts 70 2021 is Coast Guard rated for 21 passengers, while the Monachus Yachts Issa 45 Fly 2021 is certified for 14. 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 Monachus Yachts 70 2021 and Monachus Yachts Issa 45 Fly 2021 share an 14.00 ft 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 Monachus Yachts 70 2021 or the Monachus Yachts Issa 45 Fly 2021?

The Monachus Yachts 70 2021 has the bigger tank at 951 gallons, versus 422 gallons on the Monachus Yachts Issa 45 Fly 2021. That 529-gallon difference translates to roughly 1587–2645 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Monachus Yachts 70 2021 and Monachus Yachts Issa 45 Fly 2021 from the same manufacturer?

Yes — both the Monachus Yachts 70 2021 and the Monachus Yachts Issa 45 Fly 2021 are built by Monachus Yachts. 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.

← Monachus Yachts 70 2021 full specs ← Monachus Yachts Issa 45 Fly 2021 full specs