# Carbonology Ultra K1

> Flatwater trainer by Carbonology. Canonical page: https://surfskiindex.com/surfskis/carbonology-ultra-k1/
> Cite as: Carbonology Ultra K1, Surfski Index, https://surfskiindex.com/surfskis/carbonology-ultra-k1/ (checked 2026-10-15). Terms: https://surfskiindex.com/using-our-data/

## Specifications
- Length: 5.2 m
- Beam: 41 cm
- Deck height: 35.4 cm (estimated)
- Layup weights: River Glass Vacuum 11 kg, Hybrid 9 kg, Carbon 8 kg, Carbon Wood Inlay 8 kg
- Usually paddled by: Confident ocean paddlers

## Ratings (Surfski Index estimates)
- Stability band 1–4 out of 10 (editorial estimate, low confidence).
- Speed rated 9 out of 10.

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. Method: https://surfskiindex.com/how-it-works/#limits

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

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

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

## Hull
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.

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

## Trade-offs
- 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)

## 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.

## Sources
- https://www.carbonologysport.com/ultra-k1-2/
- https://australianpaddlesports.com.au/product/carbonology-sport-k1-ultra/
- https://www.carbonologysport.com/wp-content/uploads/2023/07/EDIT-1-Carbonology-Sport-Catalog-2023-compressed.pdf

## Prices
Current new prices and dealers: https://surfskiindex.com/surfskis/carbonology-ultra-k1/#buy