Surface piercing propellers rely on ventilation to operate correctly and require a surprisingly large volume of air. Even if the platform just touches the water surface as the vessel is taking off, there may be insufficient air to ventilate the propellers for them to ventilate and thus operate as designed. This is perhaps one of the most common installation problems for surface drives. Side Curtains and Storage Bins Another important aspect in the design of platforms and transoms is that care must be taken when incorporating side curtains or storage bins on either side of the surface drive unit. There should be clear water and air to both sides of the propeller unit at all times.
Surface piercing propellers require a large amount of air to operate effectively.
It is therefore of utmost importance that the hull design does not restrict the air to the drives in any way. This is particularly important if the vessel has a tendency to bury the stern when accelerating. The effect could be a vacuum under the platform, which will tend to drag and hold the stern down. The 45-degree angle should extend the full width of the transom. Propeller Trim Trimming the Seafury propeller for varying loads is not required.