Lotus looks set to postpone the race debut of its double DRS after announcing that it will not run the device in Saturday morning practice at Spa.
Friday's rain hampered the team's efforts to evaluate the system ahead of what was expected to be its first use in a grand prix. Lotus technical chief James Allison said the team had decided that with just one dry practice session likely, it was more sensible to remove the double DRS.
"Today's rain also prevented us from seeing how the 'device' would perform in the expected race conditions," he said. "With discretion being the better part of valour we will conduct P3 tomorrow with a conventional aero package rather than attempting to squeeze Friday's intended evaluation into the precious final practice session."
Kimi Raikkonen has carried out the double DRS testing in previous practice sessions, and Romain Grosjean was set to get his first taste of it at Spa.
"I was really looking forward to trying the famous 'device' for the first time, but I guess I'll have to wait," said Grosjean.