Let’s see where this will lead us … everybody’s comment welcome.
Following @noahark very nice 3D drawing about a crazy ironing board based foil idea…
Where to install the pod ?
Front wing: needs to be tested but you could mess up the water flow for the stab
Rear wing: best position for a single drive IMHO
We could position a third wing at the junction of the masts (eg 500cm2) plus a small and fast front wing (700cm2) so that you have an extra surface for a early take off. Once the take-off has occured, the third wing goes out of the water and you accelerate because you loose suddenly 1/2 of the drag… Let’s call it the 2x-efoil or twix efoil, an x-shaped mast with 2 lifting surfaces
Not sure this would work as a kitefoil (because the fuselage acts as a anti-drift surface when the kite pulls downwind), but since we have a propulsion pushing forward, this diserves to be tested !
Perfect project for dual direct drive…
For a flush x-junction, I suggest a simple halved joinery… this should be ok during a hard fall as the stress is spread over 2 mast heads …
However, the X-setup could bypass the stab counter torque (Fwing = pos lift, stab = neg lift) and create balance issues, that’s why a tandem or canard setup with 2 surfaces of positive lift might be more appropriate:
Tandem:
- front wing with positive lift (400cm2)
- rear stab with positive lift (250cm2)
- central wing with positive lift (650cm2)
Canard:
- rear wing with positive lift (400cm2)
- front wing with positive lift (250cm2)
- central wing with positive lift (650cm2)
With canard or tandem setup, we could give up the crossed-mast setup and mount a straight mast over each wing but we would loose the central wing allowing very early take-off.
How to fix a mast that is 45 degrees to the board bottom ?