% of hp of piston engines for different flight segments??

[Lady Heath]

Dear all,

I need some help in estimating some figures for part of my final year project. In order to calculate the range I need to know the specific fuel consumption per flight segment i.e. taxiing, t/o, climb, cruise, descent and landing using the following eqn:

SFC = kg / hp*hr

I know that the hp varies per flight segment but I m unsure by what percentage.

I will be doing this for a 90hp engine and a 120 hp engine.

Am I correct in thinking that cruise = 75% max hp??

Any help would be much appreciated.

Thank you