Prout Sirocco





SANY0819Sassy has the usual Prout 'minsail' rig with mast stepped aft and large roller reefing Genoa designed to prevent the lee bow burying.

She also has a behind mast mainsail reefing system and MaxiRoach mainsail (new in 2012). Given the small main and easy to reach mast I thought initially that this was rather unnecessary but it makes the rig incredibly simple to use. All sail can be set or furled literally in seconds.

Fitted to the inner forestay is a small roller reefing staysail. This is only 33ft2 but helps to windward especially when the genoa is reefed as the large slot between genoa and main is then reduced. She sails well to windward.

A tri-radial cruising chute with snuffer makes for superb downwind sailing. With the adjustable tack led to either bow this can be carried from reach to dead run. A telescopic spinnaker pole is useful to steady either genoa or chute on a run.

She can carry full sail up to about force 6 (but to windward in seas it is more comfortable to reef).

Sassy is very directionally stable and on a close reach will often hold a steady course all by herself allowing me to sit on the foredeck and daydream!


Areas: Genoa 18.67m2 201ft2

Staysail 3.08m2 33ft2

Main 9.29m2 100ft2

Cruising Chute 41.8m2 450ft2



The self-draining cockpit is superb and well protected (especially with the new sprayhood - 2018) with plenty of space. Wheel steering (hydraulic) and easy to hand sheets, winches and reefing lines.

The bulkhead compass is forward of the wheel with log/echosounder, GPS repeater engine panel and switch panel under a perspex cover.

Adjustable bracket for tablet for navigation and AIS next to the wheel.



An Autohelm ST300 wheelpilot is great for those light wind motoring days.



The photo shows the new Neptune vane steering (servo-pendulum) in action it simply transforms single handed sailing! It works reliably in any conditions from force 6 to windward in heavy seas to force 3 run under cruising chute. It even works under engine if there is wind.

Simple to connect with control lines led directly to the rudders then back to the windvane position. A by-pass valve close by (under the white hatch) disengages the hydraulic steering.


(Photo is of leaving Lundy Island heading north)









The cockpit is well laid out with Lewmar 30ST (2018) and Lewmar 24 winches for the genoa and the outer Lewmar 16 23-speed winches for the spinnaker. I tend to use only the starboard winch (self-tailing) for the genoa when single-handed as then all sail handling is done within reach of the wheel. I hardly have to move when tacking.

The hydraulic steering gives no feel but does mean that the rudders stay where they are put - a great boon for single-handed sailing.

Instrument are directly in front of the wheel and incude a Plastimo Contest bulkhead compass and Nasa Clipper Log/Sounder, GPS repeater, switches and engine controls under a perspex cover. Adjustable bracket for navigation and AIS tablet next to the wheel.











The Yanmar 2GMF (fresh water cooled) engine is in excellent condition and starts reliably the instant the button is pressed (and without any throttle unless it is really cold).

Four new flexible engine mounts.

Injectors serviced.

New 55A alternator, new water pump with speedseal, new belts and all new coolant pipes and fuel pipes.

New lift pump.

Also new starter and service batteries and all new wiring.

Parts are readily available. A good website for these is Ribs Marine with many exploded diagrams for parts selection.

12 gallon stainless tank.


The engine drives a 15x11" prop via the usual Sillette Sonic Mk2 lifting and steerable leg - enables tighter turns.





Anchoring is well catered for with a 10kg Delta stowed in a foredeck locker with 15m of 8mm chain and 90m of 14mm nylon multiplait. A custom made bow roller extending over the bow (for self-stowage) and Lofrans Royal manual windlass means it is easy to handle. The anchor rode is marked every 5m with markings shown on inside of hatch.







Sassy has never yet given me the slightest worry of capsize. It is obvious when its time to reef but the standard calculation are interesting anyway.

Read the Catamaran Stability article by James Wharram and Hanneke Boon for background information and examples of the formula.

Static stability is the maximum wind speed in steady conditions.

Dynamic stability is the maximum wind speed allowing a safety factor for gusts and waves.


Static Stability = (constant is 6.3 for metric, 14 for imperial units)


Dynamic Stability = 0.6 x Static Stability

where W = Weight (lightly loaded for worst case) = 2400kg

CC = Beam between hull centrelines = 2.76m

SA = Sail Area (main+genoa / main+chute) = 27.96m2 / 51.09 m2

CE = Height of centre of effort = 4.27m / 5m (the 5m is a bit of a guess)

Main + Genoa

Static Stability = 33knots (top of 7)

Dynamic Stability = 20knots (top of 5)


Main + Cruising Chute

Static Stability = 23knots (low 6)

Dynamic Stability = 14knots (4)


This all seems about right. In flat water with a steady force 6 she will sail well and fast to windward under full sail and feel comfortable. In gusty conditions or a heavy sea she feels overpressed and it is more comfortable to take in a few rolls of genoa.






Prout Sirocco