ðə mˈoʊst pˈɑːpjʊlɚ dɪzˈaɪn fɹʌm ðɪs ˈiəɹə wʌz spˈɛnsɚz ˌɛmkˈeɪ sˈɛvən bˈɪlt ɪn plˈaɪwʊd bˌʌt baɪ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti wˈʌn mˈoʊst səksˈɛsfəl dɪzˈaɪnz hæd mˈʌtʃ lˈɛs ɹˈɑːkɚ ænd flˈæɾɚ sˈɛkʃənz ˈæft tə pɹəmˈoʊt plˈeɪnɪŋ.
The most popular design from this era was Spencer's Mk7 built in plywood but by 1971 most successful designs had much less rocker and flatter sections aft to promote planing.