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Finn, I ran a host of props on my 4S 90HP merc. I installed a jack plate to play with the heights. It's a 17 Wahoo! So size and weight are near parody. I tried all of the Merc SS props. 18" Vengence ran best full submerged and runs 44.8 mph. The Laser II was labbed, and had trailing edge cup and thinned blades, it did not enjoy running until the prop was about 10% above the surface. It ran 46.5 mph. If you look at the blade design of the Laser II, it's basically a small ear chopper with an exhaust hub. In the merc catalog, it's classified as a semi-surfacing prop. In this situation, a standard blade design like the Vengence will be better all around prop. I'm not sure if merc props and Rude props are compatible, but I wanted to share that discovery with you all.