I recently purchased a Mercury Vengence 19" pitch SS prop (3 blade) for my 200 Mercury on a 18' Galaxy. It had an aluminum 21" that was pretty tore up and did not perform very well. I tested a 21" four blade, but it did not plane as fast as I liked, and the WOT was only about 5000RPM.<br /><br />The Vengence 19 WOT is about 5300RPM in the low 50's MPH. At that point, the boat is bouncing pretty badly with the trim up. I have a jack plate (manual) and am trying to find the right height.<br /><br />Anyway, I would like to increase the hole-shot even more ( which is quite good with the 19") I am planning on drilling the holes in the prop. Does anyone have experience with drilling the holes at an angle to help provide a better path for the exhaust gases to escape? Is this neccesary? <br /><br />Also, the 4 blade prop I tested had holes in it for different size plugs. The holes without the plugs are larger than 3/4". <br /><br />Is there any detriment toward drilling the holes large, possibly as large as 1/2 to 3/4"??<br /><br />Sorry so long!!!<br /><br />Thanks for any help!<br /><br />Rick
