I have two concerns at this stage in my test program:

1. Particularly with the APC 12x7 static thrust curve, clearly there are measurement errors. I have three options; either leave the data as is (the underlying theoretical curve is reasonably obvious), repeat the measurements one or more times, or think up further techniques to reduce measurement error.

2. There is variation, of course, of temperature and ambient atmospheric pressure between the various curves as they were measured on different dates. Strictly speaking, to combine the thrust curves in one chart is invalid for this reason. Can anyone think up a way of normalising the curves for differing temperature and pressure? Or will the differences in thrust/RPM be insignificant within the bands of temperature and pressure that I am experiencing - we are now moving into winter and it is getting colder.

I intend to provide similar data in addition for APC 12x8, 13x6, 13x7, 13x8 props.

Can anyone offer advice? (I know I should be flying)

Best wishes
Mike