No idea how you conclude the prop is ventilating, which it is not. The prop is located 1.2m aft of midship off the side of the hull.
My pedal boat is semi-planing above 7knots. That means there is dynamic lift that lifts the bow more than the stern but overall there is net lift. Below 7knots the dynamic lift is negligible and there is some stern squat and slight bow lift due to buoyancy.
The hull is designed for my weight doing 3m/s and for that speed the canoe stern without transom produces the lowest drag hull. There could be benefit in a transom if the design speed was higher.
No hull with a dead straight rocker is experiencing dynamic lift (planing force) if the bow is down and stern up. Any dynamic forces in such circumstances would cause it to dive.
On 20/03/2015, at 2:19 PM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
Rick, "What you are observing in the videos is characteristic of a slender hull in displacement mode. Water crowds at the bow providing some buoyant lift and there is a wave trough at the stern causing the stern to sink a little. That has nothing to do with dynamic lift generated when planing."
When I watch the video of your pedal boat I see a displacement boat, the bow is high and the stern is down. I dare say that if you added some width to the stern the bow would come down and you would go faster. It would improve your AOA.Also you are getting a lot of ventilation at your prop, might I suggest an anti cavitation plate. That by itself might decrease the drag in the stern.I am sorry though, when I watch the videos of the HP's I see the bows down and the sterns up. Which tells me either the sail moment is driving the bows down or there is a Monk affect from the Stern. Probably both.
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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