I have noted all the comments about the notorious inaccuracy of fuel gauges. I use to fly a 310Q and its gauges were dreadfully inaccurate - in fact almost worse than having no gauges at all. Not to be trusted.
However, the gauges in the Yak 50 and 52 are a different matter. They are excellent and surprisingly accurate. I recently took my 50 up to Sweden and back and reconfirmed that the gauges were accurate almost to the litre.
Now if the Russians were able to make simple fuel gauges for their ("GA") aeroplanes in the 1970's, why couldn't the American or European manufacturers do likewise? Bear in mind that Yaks were not designed for cross country work either so accurate fuel gauges were perhaps less required than in say a Cessna, Piper or Beech.
