height sweeps, steer sweeps, roll sweeps, and yaw sweeps, plus a load more. Back then, if a typical model was running different front and rear ride heights in a straight line, you were at the leading edge of sophistication." "That would mean the impact of introducing a much wider range of ride heights on circuit [through not having active suspension] would be greater than people were perhaps able to deal with. I’m making this up really to fit what we observed. Certainly, Ayrton really struggled with the Williams in the early season, and some of his complaints would fit that theory." Senna commented on the FW16 during early season testing, saying "I am uncomfortable in the car, it all feels wrong. We changed the seat and the wheel, but even so, I was already asking for more room. ... Going back to when we raced at Estoril last September (on testing the passive Williams at the same track 4 months later), it feels much more difficult. Some of that is down to the lack of electronic change. Also, the car has its own characteristics which I'm not fully confident in yet. It makes you a lot more tense and that stresses you." Patrick Head subsequently removed a section of the chassis to give Senna more space. However, the new passive Williams FW16 had its shortcomings. The car was springy and unstable, with aerodynamic deficiencies which the revolutionary rear suspension could not mask. Even after the initial Imola modifications, the car maintained its tendency of dynamically changing its handling balance (understeer or oversteer) for any given setup. A short account of a driver briefing which Ayrton Senna gave to Adrian Newey and his race engineer in 1994, David Brown, at Imola describing this characteristic was shown in the 2010 film Senna. In this exchange, Senna describes the car as being "worse" than before. It is also alleged that in a conversation about the FW16 between Prost and Senna in early 1994, Prost had said that the FW15C had not consistently been as easy to drive as others had assumed in 1993, exhibiting odd behaviour at times. Being more nervous than the preceding FW14B when driven at the limit this manifested itself in slight rear-end instability under braking, most notable on high-speed circuits when the car was operating in a low downforce trim, attributed to small changes in weight distribution from the