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72data points analyzed by Sailpages.com to compile this FATTY KNEES buyer’s report

FATTY KNEES

Edey & DuffπŸ‡ΊπŸ‡ΈΒ· Design: Lyle C. Hess
$2,100 avg$700 – $3,500 (2 listings)2000–2009
DinghymonoCat (unstayed)Variable

Specifications

Hull

LOA9 ft
Beam4.25 ft
Draft3.25 ft/ 0.16 ft min
Displacement128 lb

About the FATTY KNEES

Sailpages Buyer's Take

Designed by Lyle C. Hess and built by Edey & Duff (USA) from 2000–2009, the Fatty Knees is a compact catamaran with a build count of ?. It features a 9.0 ft LOA, 4.25 ft beam, and a lightweight displacement of 128.0 lb.

Best for:
This boat suits coastal cruisers and day-sailers seeking a portable, trailerable catamaran with a variable keel for shallow water access.
Bluewater capability:
With a low displacement of 128.0 lb and a capsize ratio of 3.37, it is not designed for offshore bluewater cruising but is suitable for protected coastal waters.
Comparables:
Comparable to other small trailerable catamarans like the Hobie 16 or Microcruiser, it shares the role of providing stable, easy-to-handle sailing for short trips.

Performance

Capsize3.37
SA/Disp31.5

Estimated Value

Limited Data
Based on 2 listings
Low
$1,100
Estimated Value
$1,640
High
$2,179
Inflation-adjusted to 2026 USD

Known Issues & Pre-Purchase Inspection

3 reported issues across 2 systems for the FATTY KNEES, compiled from owner reports in sailing forums and owner-association material.

1 major2 minor
Hull2Deck1

Unlock the full inspection report

Thinking of buying a FATTY KNEES? This is an in-depth report on the faults this model is known for β€” so you know exactly what to check when you walk the boat. For the price of a coffee.

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