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263craft

Carbonology · Flatwater trainer

Carbonology Ultra K1

A 5.2 m x 41 cm flatwater racing K1 with a platform seat, under-stern rudder in a countersunk housing, splash lip and cockpit rim for a spray deck, and an optional pump. Front deck 29.5 cm, back deck 25 cm. Can be built in a river layup with an overstern rudder.

Length
5.2 m
Beam
41 cm
Deck
35.4 cm
Lightest
8 kg
Source image flipped
Source image flipped
Carbonology Ultra K1, studio side profile
studio side profile · carbonologysport.com

Specifications

Length
5.2 m
Beam
41 cm
Deck height
35.4 cm (est.)
Category
Flatwater trainer
Usually paddled by
Confident ocean paddlers
New price
A$3,375

Layup weights

River Glass Vacuum11 kg
Hybrid9 kg
Carbon8 kg
Carbon Wood Inlay8 kg

On-water profile

Stability
1–4
Editorial estimateLow confidence
Speed
9

Our estimate from published descriptions and reviews. Low confidence. Speed is our rating. Both are given at the hull's own design weight.

These ratings are Surfski Index estimates, worked out from published dimensions, traced hull shapes where we have them, and reviews. They are not supplied by the maker or timed on the water. How a ski feels depends on your weight, skill, set-up and the conditions, so use them to shortlist skis and paddle one before you buy. How we rate.

Stability here means how steady the ski feels sitting still on flat water. Where two craft have overlapping ranges, we can't say which is more stable. Downwind handling is a separate thing, covered in the evidence note below.

Evidence note

This band is a cautious editorial estimate; it is not backed by a hull trace. Qualitative context includes 3 linked sources.

Suits: Flatwater racing and marathon, river racing in the down-river build. Not an ocean craft.

Paddler weight

Carbonology rates this hull for paddlers from 75 kg to 100 kg.

The maker’s published range. How this is worked out.

Generations

2017-

Gained visibility after the 2017 ICF World Canoe Marathon Championships in Pietermaritzburg; in 2018 Hank McGregor paddled a carbon/bamboo Ultra to a 39:00 flat 10 km time trial in South Africa.

Pros and cons

Pros

  • Race-proven at ICF marathon level
  • Under-stern rudder with a countersunk housing
  • Down-river build available off the same hull

Cons

  • Not a surfski: needs a spray deck and will swamp without one
  • Australian Paddle Sports lists 42 cm beam against the factory’s 41 cm
  • Weight class is quoted differently by maker (75-100 kg) and dealer (60-100 kg)

Where to buy

Carbonology Sport ↗

Dealers:

Ocean Paddler · AU ↗Australian Paddle Sports · AU ↗Ocean Paddlesports · AU ↗PaddleZone · AU ↗

Australian Paddle Sports 2026: River build (11 kg) A$3,375, Hybrid (9 kg) A$3,475, Carbon (8 kg) A$4,100, Carbon Wood Inlay (8 kg) A$5,500.

Sources

BetaRatings are estimatesRatings are estimates. How we get the numbers. Prices checked October 2026, may be out of date.