Our FSDO said it was OK to list both of us on the registration and the OK City Folks granted it.

Anything can own an experimental airplane, only one human being can be the named builder/repairman.  Thus Joe Blow and John Doe, both co-builders of a Crash-Quick experimental, amateur built aircraft must decide whether it will be a Blow or Doe Crash-Quick (manufacturer field, airworthiness certificate) even though both will own the airplane as specified in the owner field of the registration certificate.  The airworthiness also specifies who may obtain the repairman certificate.

 

Grayhawk