![Image](https://i.imgbox.com/86SUa05W.jpg)
![Image](https://i.imgbox.com/jA6i6Zvb.jpg)
![Image](https://i.imgbox.com/l8sJ7bDC.jpg)
Photo credits to whoever took them in the first place.
I had never known this car to have such a design, so I was wondering if anyone else knew anything about it?
There are pictures of van de Poele driving a conventional 291 at Barcelona, such as this one:
![Image](https://i.imgbox.com/8kdhBq5l.jpg)
Furthermore, photos of Larini at the Spanish GP show him using the conventional triangular sidepod design, while photos from Japan and Australia of both Larini and van de Poele confirm that this wasn't a late-season upgrade. At every race in 1991 it seems they ran with the triangular sidepods, except for these three photos.
Was it a separate test, perhaps after the race? The shot with the garage suggests it must have been around the time of the Grand Prix, because of the Tio Pepe sponsor signs. Was it a potential upgraded design for 1992?
Comparing the conventional and square sidepod photos above, a lot of sponsor logos have been moved about (happened throughout the year), but the rear wing looks to be in the same configuration. The font used for the car number is different, but if you look at photos over the season, bizarrely this font seems to change at almost every race. The front suspension mounting points, nose cone and front wing look identical, as does the airbox and upper engine cover.
So what was this all about? Anyone have any clues?