Was at a British pub today in my area for an event and this pulled up and parked next to my Triumph. You don't see an early S7 Sunbeam very often. Very cool inline 500. Guy rides it fairly regularly he said.
If you ever get to England the National Motorcycle Museum has 3 or 4 Sunbeams in like new condition. I consider the Sunbeam to have one of the best layout designs for motorcycles: Double loop cradle frame, inline narrow engine with shaft drive, it all makes sense. Too bad the company didn't last longer.
I always read the issue with the Sunbeam was that they did not cool well, especially the early ones. The inline engine's rear cylinder did not cool very well.
I am always on the lookout here for a Panther thumper.
Always liked the look of the Sunbeam, but they were slow back in the day of slow bikes. Back in the '70's I used to intersect with a guy commuting on a Sunbeam every morning, apparently he'd been on it for many years. He never acknowledged me - I guess he thought my '61 Norton was too modern.
Sunbeam was owned by BSA at the time, really just a badge to put on one of their bikes. They also owned Daimler cars in that period, and Edward Turner designed the Daimler V8's - not what I'd call a cottage industry.
Well 24hp according to the website, but in the real world BSA's 500cc B33 put out 25hp and would clean up a Sunbeam, add some Goldstar cams and a high comp piston and the Sunbeam would be left in the dust.