I almost clicked on that video in another list on youtube last night.
I think as you push the stabiliser down the front lifting wing imediately generates more lift so the stabiliser drag is not as much as you are expecting because board, rider, mast, fuselage, stabiliser and front wing all rise together. Likely there is some turbulence around the stabiliser as it's pushed down but as it's not the primary lift component I don't think it matters much other than that it's wasted energy from the rider. (Unless you use a bendy fuselage rear like the one I designed.)Wbrussow wrote: ↑Tue Nov 10, 2020 7:31 amI am new to foiling, and I have been teaching myself to do it by dock starting. I know, probably the hardest way to learn, but I enjoy the challenge. I have been thinking about the ideal pumping foil recently as well.
Can anybody weigh-in on the effect of the size of the rear stabilizer and fuselage length on pumping? The reason I ask is because the I think about it, if the whole foil setup pivots about somewhere at the base of the mast, close to the front wing, the rear wings vertical direction movement components will be exaggerated during the pumping cycles. this can induce large angle of attack in the rear wing, especially at lower speeds, leading to excess drag.
I know there have been some talk on monorails on this forum, and to my knowledge it has been people slowly reducing the length and size of the fuselage and rear wings, until they are left with a front wing only. I am super impressed that they are able to ride those wings, considering that those wings probably have negative coefficients of moment at typical angles of attack. How about using airfoils with reflex, and no sweep ("Planks" in the aircraft world). They would have the advantage of being much simpler and cheaper to make, as there is not rear wing and fuselage to fabricate, and potentially have the advantage of not swinging a rear wing, on a moment arm, through drastic angles of attack.
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