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registration of project

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Jun 1, 2008
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registering a homebuilt.
I understand that when you register a homebuilt/kitbuilt or scratchbuilt aircraft you MUST list the engine to be used...NOT the Serial number but the make and Model
i am building a murphy Renegade and i will use a C-75 or c-85 or 0-200 it will depend on the best deal I can find while it is under construction up until the next step becomes " Install engine"

Must I postpone registering it until I have the engine ??
I would like to get the registration out of the way ASAP because of the handed down past of this kit .
any thoughts based on experience would be appreciated

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