Siranah
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SY Siranah

Siranah is more something like a project than a sailing yacht. It is a quest for the best personal compromise for blue water yachting. The 2004-version of the OVNI 435 seemed to be a good starting platform for this. Technical installations on board make life more comfortable but must be reliable which implies they should be technically simple, robust and easily maintainable.

The following technical considerations are a private collection gathered from books, magazines and internet information.



Service Vocabulary

Berth - Liegeplatz -
Companionway - Niedergang -
Dodger - Spray Hood - 
Hatch - Luke -
Porthole - Luke - 
Sliding hatch - Schiebeluk -
Gasket - Dichtung - 
Chisel - Meißel -
Toerail - Fussleiste -
Bulkhead - Schottwand - 
Fatigue - Materialmüdigkeit -
Seacock - Seeventil -
Hose Clamp - Schelle -
Bushing - Lager - 
Roller (Ball) Bearing - Kugellager - 
Tiller - Pinne - 
Helmsman - Steuerman -
Bulwarks - Schanzkleid - 
Stanchions - Relingstütze - 
Check Valve - Rückslagventil - 
Transom - Heckspiegel - 
Pulpit - Bugkorb/Heckkorb -
Shrouds - Wanten - 
Cap Shroud - Topwant - 
Chain Plates - Beschläge -
Turnbuckle - (Wanten-) Spanner - 
Stay - Stag -
Strut - Holm / Stütze - 
Shaft - Welle/ Achse -

Rudder

Spade rudder:
bottom bearing (roller bearing / bushings) is taking all the side loads check for excessive play (shows up as movement)

rule of the thumb for rudder area: A=LWL*draft*0.05 (12m/2m/1.2m2)

Hatches and Ports

Materials:
  • Lexan (Polycarbonate): nearly unbreakable, popular choice, available with UV-resistant coating (avoid abrasive cleaner)
  • Acrylic (Plexiglass): harder than polycarbonate, more resistant to scratching, more resistant to UV crazing, less impact resistant (can break under hard impact)
  • Tempered Glass: very strong but not unbreakable, permanently clear (no crazing), inflexible
  • Safety Glass (two layers of glass with plastic between): safer, stays in one cracked layer when broken. Inner plastic layer can become foggy

Through-Hulls and Seacocks

A through-hull is the fitting that passes through the hull of the boat. It is usually a separate part from the valve. Valve types: gate valve, ball valve and tapered plug.
There are advantages to the plastic ball valves. They are not susceptible to electrolyse, but can melt if the vessel is stuck by lightning.

If the boat is left alone moored for a longer period, you can protect propeller and rudder from becoming a bio-sphere by wrapping it into (black = no light) plastic bags fixed with rubber strings. This saves the work of removing mussels and weed from these underwater parts when you return to the yacht. Don't forget to remove the plastic stuff before starting the engine!!


Cover << Sail Away << . last updated: 17-Mar-2018