Red Bull ‘lost communication’ with Verstappen’s F1 during Canadian GP
Verstappen withstood a late challenge from the charging Ferrari of Carlos Sainz on cooler tires to take his sixth victory of the season and his first victory in Montreal.
The reigning world champion extended his championship lead over Charles Leclerc to 49 points after nine races.
Speaking to Sky after the race, Horner said radio problems on Verstappen’s car left the team facing “one-way traffic” as they could not hear the Dutchman.
“It wasn’t comfortable at all in the last 10 laps after the VSC,” said Horner. “Max just couldn’t break the DRS.
“The Ferrari was very quick on the straight. They could attack the sidewalk and stay nearby.
“We lost communication with the car. It was one way traffic – he could hear us but we couldn’t hear him. I guess he didn’t need to hear us too much!
“Carlos pushed him hard,” added Horner. “The strategy was unclear. We went for the early stop. We felt that was the best route. Then Carlos actually got a free stop which set him up beautifully for the end of the race. .”
Verstappen said he wasn’t sure exactly when his radio stopped working and only realized it when his race engineer Gianpiero Lambiase informed him after the checkered flag.
“It didn’t work anymore,” he explained. “He decided to quit.
“I don’t know when it stopped. I guess it must have worked before, or it didn’t before, which I’m sure they don’t mind.
“As long as I can hear it, that’s the main thing.”
Horner wary of Ferrari, Mercedes fight back
Despite opening a decisive lead in both world championships, Horner is wary of a resurgence by Ferrari at the upcoming British Grand Prix.
Horner also thinks Mercedes could be a threat at Silverstone due to the improved form of the reigning world champions in Canada.
“We take each race at a time,” said Horner. “It’s great to go to Silverstone leaving both championships.
“Max is in the shape of his life. Max was absolutely clinical today.
“Silverstone is one of the best circuits on the calendar. There will be huge support for the Mercedes drivers. They will go there on fire.
“On pure form, Silverstone will be a good track for Ferrari. Mercedes could well be a factor for this race. I hear there will be improvements for Ferrari, so that will be interesting.
“Sergio [Perez] now has the same number of mechanical failures as Max, but it’s too early to write anyone off.