I should have listened to the voice in my head saying don't send that.
Nobody that hasn't worn out several big routers using progressivly larger bits, and understands where the pitfalls for each move awaits should try this.
Anybody who puts a big bit with something like a 3.5" cutting circle will likely know by the sound before it reaches high RPM's that there is real danger involved.
When you consider that the specific gravity of Tungsten Carbide is 14.29, which is about 25% higher than lead, the most common ammo projectile, and at ~20,000 rpms the peripheral speed would be 208 mph. If the carbide broke loose, I don't even want to think about what that would do to me,,,,,, or you.
If you are a novice and don't know what speed to use, Google is your friend, to check the manufacturers suggestion.