you are probably experiencing that shake that these cruise missiles exhibit when they push through the sound barrier. yours just happens at a lower threshold. it might be your altitude and air density?
you are probably experiencing that shake that these cruise missiles exhibit when they push through the sound barrier. yours just happens at a lower threshold. it might be your altitude and air density?On very smooth asphalt at 60 to 70kmh (35 to 45 mph) there' a perceptible pulsing as if there's a slightly out of round or unbalanced tyre. only when the tarmac gets really smooth.