Section Selection

Your choice of spar section is critical to performance. Material, size, wall thickness, weight and shape affect both static bending characteristics and dynamic characteristics ("gust response").

Selden design their sections to take class rules to the limit: - for example the Olympus boom section was designed to be simply the stiffest 470 boom possible within class rules.

Whatever your class, the extensive Proctor section range ensures that there is a mast and boom available with optimum performance. For recommendations for your particular class, please consult our specific class data sheet.

Dinghy Section Comparison

 

Mast Sections	Section Name	Sectional Weight (kg/m)	Dimension fore/aft (mm)	Dimension athw (mm)	Stiffness fore/aft (cm4)	Stiffness athw (cm4)	Used By
	2420	0.78	61	50	10	7.5	Cadet,
	Electron	1.00	61	66	11	18	Splash, Flash
	Lambda	0.86	63	51	13	10	Vaurien, Teeny
	C	0.90	65	54	14	10	Lark, Solo, Firefly
	Kappa	0.91	67	55	16.5	12	420, Flying Junior
	E	1.17	70	54	19	14	Flying Dutchman, Wanderer, Wayfarer
	Cumulus	0.95	69	58	19.5	14	420, 470, 505, Contender, Fireball
	Alto	1.07	70.5	59.5	21.49	14.96	470, Fireball, 505, Sharpie
	D Plus	1.03	73	57	19.5	14	Enterprise
	Epsilon	1.02	72	57	20	15.5	470, Osprey, Pirat, Sharpie
	Gamma	1.15	75	56	27	16	Flying Dutchman, Nomad

Boom Sections	Section Name	Sectional Weight (kg/m)	Dimension fore/aft (mm)	Dimension athw (mm)	Stiffness fore/aft (cm4)	Stiffness athw (cm4)	Used By
	2520	1.06	63	53	20	11	Solo, Vaurien, Firefly
	2628	1.00	72	63	26	16	420, Contender,Enterprise, Flying Junior, GP 14, Lark,Pirat, Snipe
	Olympus	1.02	72	66	29	17	420, 470, Scorpion, Comet Race
	2229	1.05	75	55	30	14	Contender, Europe, Snipe
	2633	1.06	85	66	40	18	505, Fireball, Flying Dutchman, Sharpie