?

Even and odds...... who cares, they all have their windrange. This is a flat C.S.L.E (flat C-kite with a supported leading edge). In Perth, intermediated-advanced riders like a C-kite (torch-fuel.Hadlow..etc) 11-9-7combo for 15-38 knots.
RPM's you get away with a 10m and 8m.

Does it matter what number is on the side?
They could easily call the 8m a 7m or a 9m there is no direct relationship between the size of a kite and how powerfull it is.
and whats power?

What you confused?
My 9m generator has the same bottom end as a 7m lithium
Or a 10m rpm has the same bottom end as a 9m rebel
But thats the lowest wind speed a kite will get me up wind
There are so many different factors that change a kites power and when, where and how it produces that power.
I find RPM's need quite a high wind speed to create power compared to say a lithium.
So now I am confused but to me if your looking for a kite with the same bottom end as a 9m rebel I would be looking at the 10m RPM