ORIGINAL: old git

Full size F 15 on piston engines?

I was in Iceland recently. I was on the Pearl (Geothermal hot water storage) and saw taking off from Reykjavic (local) airport what looked like an F 15.
It really looked like an F 15 but sounded as it it were flying with a piston engine. Has anyone a clue what it might have been? Unfortunately my wife had the digital camera at the time so no picture is available.


Although I was at some distance from the airfield there was no way I wouldn't have heard a gas turbine. Other recognition points were the vertical fins, they were triangular, coming to a point. Although I was above the airfield I did not see the planform but as tha aircraft climbed away from me I couldn't see the wing which led me to believe it was a delta or more probably of swept back planform.