Hourly rates
WSmempson
"32 litres per hour for fuel = £50ph
cost of a/c (hangerage, maintenance etc) £50
instructor £20
engine fund £5
On £130 ph cost, that gives a profit of £5ph. On £160, that gives £35ph."
I don't think that trying to include £50 an hour for hangar cost and maintainence is viable.
How much is the annual hangar cost and how much is the annual cost of servicing ? Divide these by the total number of hours flown per year for a realistic figure.