What edge angle on a drawknife

[NatG]

I'm making a drawknife at the moment, and have just remembered that most drawknives i've used don't have standard bevels on them, does anyone know if it is a single bevel, or if there is a secondary one, and what angle the primary or if there is one, the secondary edge at @?

 

[demographic]

When I have used them I have always dubbed the "flat edge" off slightly and given it a slight bevel, nothing like as much as the main bevel but it makes it simpler to use.
That was for cleaning up old oak beams at an archirectural salvage yard and was my first job after leaving school.

Have just looked for "drawknife" in my sharpening book and it says that first of all drawknives are supplied with too high a main bevel angle and it can be reduced to 20 or sometimes even less degrees.
If you leave the unbevelled edge with no bevel you can only do straight cuts but as they are more commonly used for general shaping its better to dub them off to a 5 degree bevel on the "flat" side.

 

[mr dazzler]

For a long time I used mine with a plane iron type edge (flat one side, aprox 20-25 degree bevel on the top) This was ok as I could use bevel up on long cuts on straight work, and bevel down for curves (inside radiuses) I tried putting a micro bevel on the flat side, it improves user control. The total angle including the micro bevel is now about 25 degrees which is ok for ash and oak, but 20 or 22 would be ok for soft woods like alder or lime