About What is it Quiz #448: Stapp Jupiter

Well done participants! The "car" we have been looking for is the Stapp Jupiter, also called "Stapp-Rocket" or "Mademoiselle France", built on a Voisin-Chassis around 1930...1932, to bring the speed record, held by Sir Malcom Campbell to France.
We know, that your long-term-memory is very good, so we also wanted to know, if your short-term-memory is also distinctive, as this Rocket already appeared at PWC as a mystery-car three and a half years ago. And I hoped to get some additional information about the car.

So what do we know about it? Documented is the Voisin-Chassis, but which series? JP Becret supposes, it is a 2.3L or 3L Chassis, while most sources tell about an earlier 4 Litre one. Nicolas Brondel even tells us the chassis-number and so it has to be a C5-Chassis, called "Chassasse". We also know, that two (or three?) aero engines were fitted while the original engine was used for slow cruising and also as a starter for the other engines. The type of the aero engines is mostly claimed as Bristol Jupiter, but I agree, that very likely, the engines were Bristol licensed Gnome-Rhone ones. The technical data also differs in various sources: On the backside of my photo is written: "...Er hat drei Motoren zu je 800 Pferdestärken und ist 10 Meter lang..." (it has three engines of 800HP each and is 10m long). Other sources talk about two engines and/or 600HP, but I´m quite sure, we will never find out, as there are no pictures of the car, that show an open hood. But we agree, that the engines were of radial-type with nine cylinders each. And now for something strange: Stapp claims, that he transformed the engines into "internal combustion turbines" by "removing the pistons". I think today we would call this statement "Fake News", or is there anybody, who can tell me, how he could have done this?

The look of the car was dramatic, too. Including its big fin (that, as Brian Walker knows "...was configured as a rudder connected by cables to the steering") it was about ten meters long and painted light blue. Stapp had to stand like a railway driver while driving his creation and I assume, that the manhole was totally covered for high speed drives. Stapp then used a modified submarine-periscope for forward view. The car apparently boasted four wheel drive and electric transmission and weighed 5,000lb.

Kevin Atkinson wrote, that "some claim it did actually run at Daytona (speed unknown) but most agree it never left France". I believe, the mysterious picture of the car at Daytona Beach was a picture, taken in France, but sent to Daytona in advace, for the announcement of his record-try. Stapp himself told the newspapers ""I built the car myself. Theoretically, it is capable of 312 to 370 miles an hour but i must make more tests on the La Baule sands before going to Daytona in May to attempt the world's record". 

And so he did at about 4pm on April 26th in 1932. The car was slowly driven onto the sands at LaBaule for a pre-Daytona testrun. But after about 200 meters, smoke came out from the car and Stapp ordered his mechanic, Mr Cherrière, to jump out of the car, just before he tried to do this himself, too. A newspaper article says, that the Jupiter had run over the mechanics foot and the unconscious Mr. Stapp was extracted from the car with leg injuries. But what happened to the car? Did it really burn down? Nicolas Brondel writes, that it was NOT completely destroyed and Stapp claimed, he would make another attempt. But with the Jupiter again? Stapp told about another chassis and the destroyed car is referred to as "Number 2", with the hope expressed that he'd be back with an improved "Number 3". So I really believe, that the car WAS destroyed. But what about Fred Stoles answer? He writes "At a second test on the Saint Germaine-to-Paris highway, the beast caught fire." And there really are hints, that a record-breaking car with Rene Stapp on the wheel was destroyed on the Highway and not on the sands of La Baule. But this seems to have been the precursor of the Jupiter. The car "Number 1".

What a story, but for myself, the most bizzare fact is, that the car was road-registered(!) and there is at least one movie of the car "wobbling" through the streets of Paris. And I think that might be the reason for the spare wheel, that was an inevitable part for the registration. So let´s finish this story with the words of a reporter, who saw the beast in action: "I have not heard such noise since the Great War! The sight of the car on the road, trailing long streamers of orange-colored flame from the holes in the tail, and making a noise like an artillery barrage, was distinctly impressive."

 

But who is the winner of the quiz? Many good and correct answers again this time! Winner of Quiz #448 Chris Mooney as his answer includes most correct fundamental information. Well done and congratiulations Chris!