Re: Is this ventalation?
If you have two props doing the same thing, you are probably experiencing ventilation. It is unlikely that the hubs are gone on both props. If an aluminum prop ventilates on a pontoon, it is probably due to the engine being mounted too high on the transom. When a tip of the prop blade cuts the surface of the water, it will suck in air, causing ventilation at higher speeds. You have some options: 1. lower the engine one hole on the transom. This is never my first preference, as it will increase drag on the boat with more of the engine in the water-slowing it down and affecting fuel economy. 2. you can see if you can locate a stainless steel prop of the same size and pitch. Stainless props typically have more cup and are made to run in slightly "ventilated" conditions and not slip. Not all prop companies make stainless props down to the pontoon pitch sizes, however. 3. You can try a special pontoon prop, which has the large blade area. My guess is that even this prop may ventilate, since it would probably be aluminum and have less cup.
