Indeed, there are other exemptions from the ELT requirement that may be useful or of interest to experimental homebuilders. Reference 14 CFR 91.207 ("Part 91")- there are exemptions made when it is required to ferry an aircraft from a place where repairs cannot be made to a place where they can, and other ferry operations. More useful, however, are these:
(3) aircraft while engaged in training operations conducted entirely within a 50-nautical mile radius of the airport from which such local flight operations began ["flying off your hours"] (4) aircraft while engaged in flight operations incident to design and testing (9) [as mentioned by Virg] aircraft equipped to carry not more than one person. Oscar Zuniga San Antonio, TX mailto: taildr...@hotmail.com website at http://www.flysquirrel.net