Pay close attention to the fact that prop sizes that are not offered by Top-Flite, in the Power-Point series, are not even listed.

...No more extreme pitches (9x8, if you can call that extreme), no fractional inch props, like 11.5x6, or the 12.25x3.75 are listed.

In short, this chart is lacking as well as incorrectly arranged.

Since Sid Axlerod passed on years ago, this company has never been the same.


The disarray results from this:

Since as we go to larger engines, they need props of a higher load, this chart should have been arranged as a function of rising load.

Instead, it is arranged in rising diameters, along its 'Y' axis.
Within each diameter, the props are arranged with higher pitch and load, as you go further up.

BUT....

The 9" diameter starts from the 4" pitch and rises up to the 7" pitch, with load rising accordingly, as you go higher.
Then comes the 10" diameter, starting from the 10x4..., which offers a lesser load than the 9x7 size, which proceeded it.

It continues with 10x5 - 10x8 props, which again exhibit a rising load, but the next size up is in the 11" diameter range; the 11x4, which offers a lesser load than both the 10x8 and the 10x7, which proceeded it and is about equal to a 10x6...

This is the way this chart is arranged and it is repeated in subsequent diameter groups.

If I were to make a corresponding graph of prop load per prop size, as the props are arranged in this chart, it would resemble a rip-saw blade, with distinct saw-tooth forms.

But since the engines listed in the chart/graph's 'X' axis, are arranged by rising cubic displacement (and load bearing capacity), the props on the 'Y' axis, must be arranged accordingly, with the load rising as you go further up, not grouped by diameters, as it is arranged now.


I think wrote this is my next project...