flight hours vs hobbs hours and repairs ?

[SidT]

One of the clubs I have flown from records the tacho but the charges are quoted/charged in hours on a formula of 1hr=0.8 tacho.....

In other words if you do 1 tacho you will be charged hourly rate*1.25 (which seems weird but I suppose it means they can quote a cheaper "hour" cost as other clubs locally advertise/charge by the tacho hour). It also means if you fly more economically you get more time for your pound.

In our group aircraft we charge ourselves £100 per tacho and the difference between that and the fuel cost goes in the kitty for maintenance etc. With the current fuel prices this means each hour we fly adds roughly £35 to the kitty (depending how lean/economically you fly).

I have never seen/come across a Hobbs but my selection of clubs/aircraft has so far been quite limited.