8/12/2023 0 Comments High five boat propeller 19 pitch![]() ![]() The aluminium prop would just ventilate like crazy at the same speed, enough that the engine over-revved and you had to slow down.Īll this is of course relating to a much smaller boat/engine than yours and although Mercury say the HighFive is suitable for 75HP and up I think it probably needs a big, torquey engine to come into it's own. You could feel your neck muscles tensing with the G-forces. ![]() With the HighFive I could throw the boat into a tight turn at pretty high speed and it would just grip and go round. The Laser II is almost as good and both are way better than the standard Quicksilver aluminium prop. I bought a bunch of various sized plugs but never got round to trying them because they are difficult to swap with the prop on the boat.Įven though the HighFive was slower on both acceleration and top end I was still loathe to swap it out because the grip it gave on cornering was phenomenal. We tried the prop with no plugs and the boat could not plane off it just sat there 'wheel-spinning'. Mine came with the 'medium' plugs and worked quite well. The Laser II came with the later version of PVS where you can swap out plastic plugs with different size holes (and hence gas flow). As the boat moves forward the water flow stops the gases escaping, the prop grips and the boat takes off. The idea is the blades grip less during initial acceleration, allowing the engine to spin up into it's peak power range. This features holes in front of the blades in order to allow the exhaust gases over the blades at idle. ![]() The HighFive came with an early version of the 'Performance Vent System' (PVS). An 18P Vengeance I tried gave even better acceleration but the engine was over-revving flat out. This gave me better acceleration than either of the two previous props and a top speed of about 45mph. I replaced the HighFive with a 20P Laser II, modded to 19P. Acceleration was about the same as the previous 21P aluminium prop and top end was down from 47mph to about 42mph. I had a HighFive 20P (small hub) on my Fletcher Arrowflyte/75HP Mercury. ![]()
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