These huge kites, and a third design, come from Premier Kites.  They are 13ft (4m) across and nearly 45ft (14m) long.  They are, in consequence, quite heavy, so the freight on them is not cheap.  They fly easily in winds from about 7mph up to 20mph, and develop a strong pull in anything over 10mph.  They will lift plenty of line art/laundry, but make a spectacular display on their own.  Definitely not for children, although smaller versions of this “flowtail” style make ideal children’s kites.  Price (2011) is $179.95, and I bought mine from Helen at Picture Pretty Kites who usually has them in stock.