How is a downcut v-bit even possible?

[bradleyheathhays]

I'm buying my first router bits as a new CNC owner, and although I've been suggested to look for downcut V-bits, I just don't see how designing one would be possible without spiral flutes. Yet, I see them advertised as 'down-shear.' So what's up with this? Is calling them downcut just a marketing ploy, or does someone out there actually offer a genuine downcut V-bit? And if so, who?

Also, who sells 1/2" wide V-bits (1/4" shank)? I've found 3/8" wide but no 1/2"

 

[Maverick]

I have bought my bits from idcwoodcraft.com. If he doesn’t have what you are looking for, looks like whiteside has one.