What is the RV-10s approximate service ceiling?
I believe there is some literiture out there that shows the service ceiling as somewhere around 22,000′. This is probably very close to it’s actual service ceiling. There has been at least one RV-10 taken to over 21,000′. You will no find great climb performance at those altitudes though. Most RV-10 x/c flights will be very comfortable between 8,000 and 17,000′.