Flight times
Just to add another notch to the debate.
Except for Robinson, I've never used any system for helicopters other than as follows and as mentioned earlier.
Pilot log book times: Rotor blades turning.
Tech log and aircraft/engine log times: Skids off to skids on.
Just bear in mind that should there be any kind of ground incident with rotors turning ... it will be the pilot at the controls who is deemed responsible. So as I have argued before. Pilot responsible ... pilot logs hours as Captain.
Oh and just a tit-bit from too many years in the business.
Be wary of any legal action that emanates from the use of a Datcon or similar instrument's recording of flying time. Yonks ago, a court decided that a claim based on a mechanical instrument reading (in that case flying hours) must fail unless the subject mechanical instrument had been inspected and declared accurate by the weights & measures department of the UK Customs & Excise. The same system exists for every car forecourt fuel delivery pump. Years ago we used to see the Customs men on the forecourts with their funny brass containers checking the delivery accuracy of the pumps.
Happy days I say! Regards to all. Dennis K.