# Sipre Ackua 645 (Veloce)

> Surfski by Sipre. Canonical page: https://surfskiindex.com/surfskis/sipre-ackua-645/
> Cite as: Sipre Ackua 645 (Veloce), Surfski Index, https://surfskiindex.com/surfskis/sipre-ackua-645/ (checked 2026-10-15). Terms: https://surfskiindex.com/using-our-data/

## Specifications
- Length: 6.45 m
- Beam: 45 cm
- Deck height: 33.5 cm (estimated)
- Layup weights: Fiberglass (polyester) 13.5 kg, Carbon vacuum (epoxy) 11 kg
- Usually paddled by: Confident ocean paddlers

## Ratings (Surfski Index estimates)
- Stability band 5–7 out of 10 (dimension estimate, low confidence).
- Speed rated 9 out of 10.

Modelled from published beam, length and deck height. 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 estimated from published dimensions. Qualitative context includes 2 paddler reports and 3 linked sources.

## Paddler weight
Estimated sweet spot 82–95 kg, broader estimated guide 67–99 kg. An estimate from hull dimensions, not the designer's intended weight.

## Suits
Flatwater racing and ocean downwind for fit, experienced paddlers wanting speed and maneuverability.

## Hull
Full-length 6.45m race hull at 45cm width, the same beam as the Epic V10 and Nelo 560 advanced skis. Long waterline for glide with a lively, responsive feel Sipre markets as fast and maneuverable; secondary stability rewards an experienced paddler.

## What works
- Fast, long 6.45m race waterline
- Advanced 45cm width in the Epic V10 / Nelo 560 band
- Light carbon layup (~11kg)

## Trade-offs
- Demands solid balance, not for beginners
- No AU dealer, import/secondary only
- Naming overlaps the OC1 'Veloce' outrigger

## Generations
- ~2014-present: Launched 2014 as the 'Ackua Veloce' surfski (surfskiportugal), later catalogued as SS1 Ackua 645; a 6.45m x 45cm performance hull. Note: an OC1 'Veloce' outrigger shares the Veloce name in the current lineup.

## What paddlers say
- surfskiportugal.wordpress.com launch post: a 'novo SIPRE surfski... modelo de performance' with 'linhas muito fluidas e atractivas' (very fluid, attractive lines), debuted competitively by Artur Pereira at the SIPRE Kayak-Sea Cup (surfskiportugal.wordpress.com).
- The surfski.info chart places 'Sipre Ackua Veloce' at 45cm / 645cm, alongside the Epic V10 and Nelo 560 advanced-race hulls (surfski.info).

## Sources
- https://surfskiportugal.wordpress.com/2014/05/04/ackua-veloce-novo-sipre-surfski/
- https://surfski.info/forum/19-boats/18846-surfski-width-x-length-chart-jan-2026.html
- https://www.kayaksipre.com/ss1-ackua-645-3/

## Prices
Current new prices and dealers: https://surfskiindex.com/surfskis/sipre-ackua-645/#buy