I would love to get my hands on an HRD!
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Me too
@SG John (massive thread derail coming on).
1) Because I've always admired the radical design innovations encorporated in these late 1940's designed machines.
2) Because of the "Aussie connection".
When Philip Vincent decided that he wanted to produce the best & fastest motorcycles in the world, he enlisted the aid of Aussie ICE/engineering genius Phil Irvin (Irving also designed & build the Repco Brabham V8 that powered Jack Brabham to formula one drivers & constructors championships). Ol' Phil definitely delivered for Mr Vincent with the Rapide, Black Shadow & Black Lightning (track version of the Shadow) designs. We've all seen pics of Rollie Free in a swimsuit, lying outstretched atop a lightning-ised black shadow (sans seat) on the salt flats setting the land speed record

Mr Irving built two Black Lightning's himself at the Vincent works, one went to an English racer, the other to an Aussie. The "Aussie" machine was first pitted against Vincent's "development" mule, out-running it & clocking 200kph in 3rd gear. After being punted, crashed & scaring the crap out of the original Aussie owner (who refused to ride it again), it went through maybe a few hands before ending up in the small NSW country town of Gunnedah (about 45 minutes from where I grew up) in the hands of Mr Jack Ehret, who punted it in races & sprints, as well as using it to set an Aussie speed record on the small, roughly asphalted 2 lane highway that runs between Gunnedah & where I grew up. Mr Ehret owned the bike until he put it up for auction, still in its stock form & race trim (Bonhams, Las Vegas) in 2018 where it sold for US$929,000, making it the highest priced motorcycle ever sold at auction. Here's pics




Now if you like the HRD Vincent Black Shadow
@SG John,you really should check out what (Melbourne, Australia) brothers Ken & Barry Horner are doing with Mr Irving's design.
Back in their young days they scored a "B series" Rapide donk for use in (I believe) a sidecar outfit. Through punting this on the track they got to meet Phil Irving, who helped them with the project. Later in life (after Phil Irving had passed), they got the idea to see just how much they could wring out of Phil's cracking V twin design. They approached Phil's widow (who held the design rights) & she gave them the green light. The "Irving Vincent" project was born. To see how they've developed the design, check out the Irving Vincent site
www.irvingvincent.com or
The Irving-Vincent
Check the video on this 2nd site to see one of their (sidecar) outfits in action ( video camera on back of bike, & how'd you like to be the guy "swinging"??)
They have made an effort at producing a street registerable version of the Irving Vincent, but emission standards got in the way at the time. Apparently the idea is still being kicked around.
Now how good would cracking around on a road registered variant of the Irving Vincent be guys??
Sorry for the long-winded rant/derail.
Cheers