The Birchwood 22 first came out in 1970 and featured an open plan cabin arrangement for four people. The reasonabily sized cockpit had a GRP hardtop fitted. The first models were called the interceptor range, had a shorter wheelhouse hardtop and were all outdriven. The 22 version featured a longer hardtop and most models had inboard engines, with conventional shaft drive. The shaft was some what protected by a tunnel moulding in the hull. Engines in the early Interceptor versions features Volvo 115/130 petrol outdrive engines. Later Birchwood had Wortham Blake petrol shaft drives.