The boats were making their annual trip from the Netherlands to Lowestoft but two got into difficulty and RNLI lifeboat Spirit of Lowestoft was launched.
The first call-out was shortly after 9.50am when crews rescued a stranded 25-foot yacht which had mechanical problems three-and-a-half miles south of Lowestoft harbour.
Coxswain John Fox said: 'Despite some language problems with the yacht's two-man crew we managed to secure a line to the vessel and tow it to safety.'
At 5.15pm the RNLI rescued a 47-foot yacht called Blue Velvet with five people on board which was unable to start its engine due to a faulty battery.
Both vessels were towed to safety where they joined their fellow countrymen.
It was the 35th year that a fleet of yachts from Toerzeilers, the Dutch Association of Tour Sailors, had sailed from IJmuiden and Den Helder in the Netherlands to Lowestoft, bringing 120 sailors to the Royal Norfolk and Suffolk Yacht Club for the weekend.
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