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The Rainbow IV was built by Ditchburn Boats a manufacturer of wooden pleasure craft launches and racing boats located in Gravenhurst. At one time the company was the largest boat manufacturer in the Great Lakes region. Ditchburn is particularly known for producing high quality mahogany launches which have become highly prized by collectors in recent years. Ditchburn was in operation from 1871 to the 1930s, becoming victims of the Great Depression. It surfaced after and contributed to the war effort, but the days of the mahogany 'get- abouts' was over.
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the father of Canadian Powerboat Racing, Harry B Greening. According to the Canadian Motorsport Hall of Fame, "
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The 1924 Gold Cup Controversy
Greening's Rainbow IV had apparently won the race but was seen by some as being a hydroplane rather than a displacement hull. And so, a protest was filed.
The craft's bottom was of lapstrake construction, which was technically permitted by the rules. The APBA decided, however, that the strakes had been installed for the express purpose of achieving a hydroplane effect. In other words, Greening had followed the letter of the rules but not the spirit of them.
As a result, Rainbow IV was disqualified and Caleb Bragg's Baby Bootlegger was moved from an overall second to first position. This action effectively ended the Gold Cup career of Harry Greening. He never raced for the cup again.
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"At the long distance speed test of Rainbow IV I
was present, and shortly after noon hour Rainbow
IV completed her 1064th mile and with more hours to go was on
every lap creating a new world's record. A brisk breeze was blowing along the
Muskoka Lakes, and Rainbow IV was tearing off additional mile after mile towards
a new international record, which may stand for a long time unless Greening
himself decides to better it.
The last I saw of Rainbow IV on that day, Herbert Ditchburn, her builder
was at the wheel and the little boat was touching only the high spots as she reeled
off miles almost while we were thinking about it. At the end of the 24 hours
Rainbow had established a new world's record of 1218 miles, and Greening was
again vindicated."
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Having been newsworthy for several years in the early twenties, along with being an industrialist, a Canadian breaking ground in sport, and frequenting Muskoka, it is not a surprise that the Rainbow IV makes an appearance in the mural at Parkwood. I haven't yet made a definitive chummy relationship between RS McLaughlin and HB Greening, but they certainly would have crossed paths, even if it was just being among the names to own a Ditchburn Boat.
To read more: ditchburnboats.ca has a wonderful history, including chapters of a book on its history.
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