Also check out the following:
- Onsrud Surfacing Cutter
- Magnate Surface Planing ( Bottom Cleaning ) Router Bit , 2 Flute Carbide Tipped
I can't yet post links on this site so I just mention the bits; you can google search them. The Magnate gets a very good review:
" I do a lot of router sled planing of large hardwood slabs, 1 to 2 per month on average. After trying numerous bits I settled on the Magnate 2706 Bottom Cleaning Bit ( 2" cutting diameter, 3/4" cutting length with a 1/2" shank) in a PC 890 (2 1/2 HP) running at 16,000 RPM. This bit really does a solid job but be aware that upon completion of the planing process there will still be a need to sand out the tiny ridges, more like registry lines, that one gets with any bit in this process. Magnate seems like a solid company; wide selection, reasonable prices, quick shipping, good people and the bits outlast any of the others I have tried." (from Sawmill Creek.org site)
Also, check out lumberjocks.com/topics/1992.