Octura letters?

[Blackjack-sven]

What do the letters in Octuras lineup mean. I see they have X, M, P, Y and potentially more which I either don't know or can't remember.

I know X is the one most people use but the rest of the letters are Spanish to me.

Oh and how can you tell if the prop is a lifting prop?

[vasy]

http://www.fastelectrics.com/octuraprops.htm

the last part of the page goes into letters.

[Alexgar]

thank vasy i was wondering the same

[lectriglide]

http://www.fastelectrics.com/octuraprops.htm

the last part of the page goes into letters.

GREAT prop charts

[NativePaul]

If it doesn't have any letters it is a lifting prop.

[Blackjack-sven]

I'm wondering Native.

More rake = less lift?
cause on the chart it says this.

1700
Highest levels of lift in Octura range
No rake on trailing edge


I'm wondering this so when I physically look at them I can see if it's a lift prop.
And how important is lift on a cat?
What does lift help with? Porpoising?