50 Engine hours? Like on my on board generator's Hobbs meter? They are talking about a very different concept in automobiles here!(Does it come with extra engines and a mechanic?) Not really in the same realm as a Goblin or other regular "road going cars". High Strung and High maintenance. For the price it seems a quite amazing race car! A real steal, it appears it could be driven on the road but you won't be stopping at the Kroger on the way home for a gallon of milk.
But that body could give a Goblin owner ideas.
Rush SRs are not road legal and could not be made so, they are straight-up race cars. Radical do make some cars that are road legal, but not sure how difficult they are to import or get through state inspections in the US (Radical is a UK company).
50 hours is a number I've been quoted on Radicals, and the Rush SR is a similar deal I think. These are motorcycle engines that have been modified to extract performance, so they typically exceed a the "rule of thumb" of 100 horsepower per liter of displacement, so they get used up pretty quickly. Also note that a car weighs more than a bike, so you're asking the engine to do extra work. Rebuilds are typically in the $4,000 - $6,000 range.
With cars like the Rush and the Radical you are owning a true race car. That means constant maintenance, engine rebuilds, slick tires, rain tires, increased disposables costs, 110 octane racing fuel ($12 a gallon), etc. You typically get multiple gear seats and you change them on a per-track basis (think long straights at Watkins Glen, short and twisty pieces at New Hampshire and Lime Rock...). These are typically chain-drive cars, so there is the need to lubricate and tension the chain multiple times a day, and chain replacement is a regular thing. You can, and a lot of folks do, crew them with 1 person for testing days, but for a race weekend you really need a 2nd person or more to help you out. They are designed and built to be cared for, so for example, a competent mechanic (i.e. not me lol) can pull the engine and reinstall it in a couple hours. Most guys I know have 2 engines, 1 rebuilt and ready to go, and 1 in the car. And I've seen teams swap a motor in the pits between sessions on a race weekened.
It's a whole different ballgame than the Goblins and Exocets, which give great power/weight ratios in a much more maintainable platform. You can easily crew the Goblin alone, the engine will last way longer than 50 hours, and with the right tires, suspension, and aero you can really get these things to stick and handle, as you've all see from Justin Reed's adventures.
I own an Amac AM-7 D-Sports Racer. It uses a George Dean-modified Yamaha R1 engine that produces about 200WHP in 1-liter package. The dry car weighs about 800 pounds, so with driver and fuel it's around 5.3 pounds per horsepower. I bought it several years ago and instantly realized that I'm in over my head LOL. My first time out I easily hit 140mph on a fairly short straight, tapped the brakes and pulled it down by 50% in a very short distance, I thought about turning-in and bam I was on the apex. Everything happens really fast, and being so low to the ground everything looks different. I'm restoring that car as it was a mess when I bought it, and it's in the trailer until I finish my Goblin build. The jury is still out as to whether I'll keep it or sell it when it's done, as I'm really in love with the Goblin platform right now. Here's my Amac after we got done with the bodywork and repainting....