A car involved in a fatal crash was going "well in excess" of the speed limit and hit a wall "like a bomb", a court has heard.
William Webber, 36, died following a crash in his friend's Porsche a short distance away from his home at a farm in Strichen, Aberdeenshire.
His friend Douglas Calder, who was driving the car, is accused of causing his death by driving dangerously on April 15, 2011.
Giving evidence on Wednesday at the High Court in Aberdeen, police constable James Duncan, 43, said the car had travelled around 120 metres out of control after hitting a covered drystone dyke.
Advocate depute Iain McSporran asked the officer if he could tell anything from the distance of the first impact mark with the wall and the final resting place of the sports car.
Grampian Police constable Duncan described it as a "huge distance".
He said: "There must have been some speed involved." Asked to clarify "some speed", he replied: "a fast speed".
PC Duncan said: "The loss of control was well in excess of 70mph.”
The Grampian police road collision investigator also said that after colliding and travelling along the dyke the speed had been such that the car had cleared a ten metre gap without touching the ground before hitting the wall again "like a bomb" on the other side.
Mr McSporran said: "What kind of impact did it (the car) have?" The police officer replied: "It was like a bomb going off."
The impact cast off debris over a 20 metre radius. The car then tumbled four and a half times over 56 metres to its final resting place upside down in an adjacent field.
Earlier PC Gordon Macdougall, 34, who interviewed the accused after the crash, read the jury parts of his notes taken during an interview with Calder from the day.
Mr Calder said in the interview: "We were coming down that hill and I normally slow down for the kink at the bottom, which goes off about 20 degrees to the right. I wasn't looking directly at the speedo but I was doing about 60 to 65 mph."
Mr Calder claimed to PC Macdougall that there was a depression on the right hand side of the car which had caused the car to jump up "quick as a flash".
He tried to correct his direction but ended up facing the dyke and that was the last thing he could recount to the officer.
The jury also saw video footage of investigating officers using a similar car at 70mph on the road.
Calder, of Andorra, denies the death by dangerous driving charge.
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