Manor boss Dave Ryan is not surprised by Rio Haryanto's mistakes in the first week of testing, saying it is natural for a rookie to push the limits of a new car.
Haryanto's first two days in the Manor MRT05 both came with spins, one of which ended with his car in the wall on Thursday. The Indonesian driver was only confirmed at Manor last week and he arrived with four seasons of GP2 under his belt.
Asked if Thursday's spin was just an example of a young driver pushing the limits, Ryan said: "Yeah, I think so. To be honest I would have been surprised if he didn't have a couple of incidents. As long as he learns from it, it's fine. It hasn't cost us, let's just get on with it and see how it turns out."
Haryanto has joined reigning DTM champion and Mercedes protégé Pascal Wehrlein in an all-rookie line-up at Manor. Ryan does not think comparing the drivers at this stage is fair because Wehrlein tested F1 cars on numerous occasions last year, including the class-leading Mercedes W06.
"I don't think that's a fair [comparison] at this stage. Pascal has come in from winning the [DTM] championship, he's done a lot of mileage in a Formula One car -- the class Formula One car on the grid. He's got a lot of experience and he knows what to expect, it was probably the transition to Manor that was the big issue.
"Rio, on the other hand, is just the opposite, he's making the step up for the first time. So pretty different approaches but both great kids and it's great to have them around, we're enjoying it ... They've both got a fair bit of racing under their belts. Pascal in particular has got a lot of experience given his age. We have to trust them."
Haryanto said Thursday's mistake was a result of simply pushing the car too hard.
"I was getting used to the car and finding the limits of the car. So I went a little bit hot today in Turn 4 - and unfortunately there was damage to the car so we couldn't finish the afternoon session. But we had a good morning session where we managed to follow our run plan and we also did a lot of improvements with the car. Hopefully I could still learn more for the next one."