Meet the CarnubaCraft a keyhole type propeller design

 Try NatureHacker's Teeth Powder for Free!

This can be used for anything from a boat propeller to a fan to a plasma propulsion system or anything else.

I can't quite tell you yet why the design looks like this (I now know why see below) but I assume it will "hug" the medium quite well as has been stated with other keyhole propeller designs like Sharrow Marine.  Karnuba means Hug in Hausa language.

So anyway here is my bad sketches:

See below for a higher res picture but I will explain a bit now that I figured out about the shape.  This is an extreme lift design.  It has the sweeping arc just like the top of an airplane wing that creates a low pressure zone and will pull the craft in that direction.  But also it has a keyhole type shape that will create a high pressure zone there and will push the craft again in the direction of the sweeping arc.  So in the above picture, the craft will move to the left.  Just pushing a shape through a medium wouldn't usually make it go one direction or another in a friction free ideal medium, but no medium is friction free so the more friction and/or advanced newtonian physics, the more lift this design will generate.  Notice there are optional carve-outs one on opposite sides of each hump the large and small ones.  looking at the sketch at the bottom of the page there is a carve-out towards us of the large hump and there is a carve-out on the other side away from us on the small hump.  I think these will help with tip vortices and possibly other cavitations.  This shape can be used on anything that attacks any medium, be that air, water, plasma, or any other liquid or gas.  It doesn't have to rotate like a propeller (but it can with any number of blades) it can be the shape of a wing or a plane hull or a fully submersible float on a boat or plane that lands on water or anything else.  This shape will help the craft generate very strong lift in any medium.  It can also be adjustable in precise shape on the fly. The proportions can be anything and the shape could be skewed to one side or the other or elongated or shortened in any way.  It can also be used in mixing things and any other use.

Basically the design is anything that decreases pressure above or below the shape when a medium of any type moves past it and increases pressure on the opposite side opposed to the side it decreased pressure on.  So if lift is required it would decrease pressure (static or dynamic or another type) on the top of the shape and would increase pressure on the bottom of the shape.  So if a medium flows relative to the shape the shape would have a vector of acceleration in a way that is perpendicular to the direction of the mediums relative motion.  This acceleration is achieved by any means that both increases and decreases relative pressure on either side of the shape perpendicular to the medium velocity.  Any shape can be used to do this task and preferably there is one or more convex surface in the direction you want the shape and/or body to move and one or more concave surface (or sharp edges or any other shape) on the opposite side of the direction the shape or body is desired to move.  And of course this shape can be made to change throughout operation for any reason and by any means including to effect lift in any way, effect stabilization of craft, effect drag, effect speed, effect angle, compensate for viscosity or changes to viscosity or anything else.  This is important since as of now planes generate more lift on takeoff by pointing the nose up, instead of doing this, the wing shape can be changed with the current invention and the plane can always keep an even keel.  In addition to or instead of the shape driving the pressure differentials, materials or other physical properties can also be used.  For example the top of the shape could be teflon or emitting ions or anything else that reduce drag and the bottom could be emitting opposite ions or a rough surface or anything else that increases drag.  The only necessary requirements for this invention is that a pressure differential is created between the "top" and "bottom" or front or back or any other opposite sides that are both perpendicular to the relative medium flow. Since this has been done for a long time where more specificity is needed but not in all instances, both opposite sides should be changing the pressure, not just one like a typical wing.  But in other cases where material or other physical properties are changed only one of the surfaces need to be changing the pressure since this hasn't been described before.  These differences in drag can also cause a pressure differential between the top and bottom surface.  The shapes of course can be used at any angle desired and that angle of attack can be changed during operation if desired by any means required and to any angle at any time.  This idea can also be used in conjunction with the flapping propeller design.  The below picture like everything else talked about here can be a propeller blade, fan blade, wing, float, ship, propulsion system, turbine blade, mixer blade, aether blade, or any thing else where a shape moves relative to a medium it is within.

Here is a pic of sharrow marines prop for comparison.  I did not know of this before my design as I only found this propeller after searching for "keyhole propeller" Since that is what I knew mine was similar to:

Iterative prop design is easy!  Simply need 4 things.  3D CAD Software, a 3D Printer, and a Thrust Stand, and a Power Analyzer!