I'm doing a statistics project on engines and would appreciate any thoughts or information you could help me with. I am comparing YS and OS two and four strokes, pretty much the engines that are available now, with a few extra YS for a little more data.

[link=http://cid-e6c10583b12bccdc.skydrive.live.com/browse.aspx/.res/E6C10583B12BCCDC!112]Link to the report[/link]

The main thing I could use help with is prop information. People say with four strokes 'you can swing a bigger prop' so I'm trying to find the best way to quantify this. One idea was to sum the pitch and diameter. But most importantly I could use some help with evaluating the prop selections I found for each engine. If you have any ideas of how to quantify engine vs. prop load I would really really appreciate it. And any ideas of what kind of statistics you would like to see about these engines. Thanks so much!

YS 63FZ 12x8
YS 91FZ 15x8
YS 110FZ 14x12
YS 110FZs 15x11
YS 120SF 16x10
YS 140L 16x12
YS 140Sport 16x11
YS 140DZ 17x12
YS 160DZ 18x8
YS 170DZ 18x10

OS FS40 13x7
OS 56FSa 13x7
OS 72FSa 14x7
OS 81FSa 14x7
OS FS91 16x6
OS FS91 pump 16x6
OS 110FSa 16x8
OS FS120 16x7
OS FS120 pump 16x7
OS FS200s 20x8
OS FS200s p 20x8

OS 46AX 12x7
OS 55AX 13x7
OS 61FX 13x7
OS 75AX 15x7
OS 91FX 13x9 (15x6?)
OS 120AX 16x10
OS 140RX 16x14
OS 160FX 18x12
OS BGX3500 20x10