For Shawn Coyle, idle stop and 212man.
The airspeed indicator has been checked, it was my first thought, and it checks out 'satis' and this is accepted as in forward, straight and level flight the IAS = Ground Speed as far as I can assertain in zero wind conditions.
The performance graphs refer to Vy and therefore accordingly I have flown Vy at 65KIAS as required by the text.
I have sent the data that I collected to the manufacturer and await their reply.
I believe that there is a position error correction which needs to be applied, or if this is not the case and IAS used for climb performance there is a possibility that at higher altitudes this may ulitmately effect the expected performance.
If I were, for instance making a pre-flight calculation for climb performance from 1000 ft to 5000ft Hp , the graph would give a RoC for a set temperature and Mass (Weight). If this performance were unobtainable would it be that the engine was under-performing. If the performance was achieved would this mean that IAS was correct or that better than normal engine performance was the result.
If you would please wait until I get a response from the manufacturer before I name the model.
Balanced flight is easily maintained and there are positive airspeed changes when not in balanced flight, as one would expect.
My next tests will involve flying the descent and climb out of balance by 10 degrees left and again right, to see if there is an effect there.
Thank you all for the clues and ideas