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Prop size is not the same across model of prop. Each model has a unique blade design and has a unique performance signature.

When discussing prop, always include the model with the size.

A good prop will reach WOT rpm when the boat is running light, no crew or gear.

The Enertia, Vengence and Rev 4 (4 bladed) models are good all-around performer.

The diameter of the prop is established by the outboard gearcase. The pitch is determined by WOT rpm's and target boat speed and a few other factors.

What is the year of the Verado? - need the gear ratio-

I see there is one authorized Mercury dealer in Israel. You may want to contact them and see if they allow testing/exchanging props.

Here is the Mercury dealer (from factory website).
https://www.ambil-yam.co.il