I made application the other day to register my plane with the FAA.  I just got back today in the mail a request to clarify the type of engine on the Affidavit of Ownership.  “The type shall be either reciprocating, turbopropeller, etc.”

“The type ‘wankel’ is unknown and is unacceptable.”

Since the engine is none of the above, what did you guys use when you registered your planes???   I am at a loss as to what would be the correct type???

Bill B