Currently there is an "experimental" Bell 206 /
OH58 helicopter on EBAY.

I know that many of the L-39's and other warbirds
are operated as experimentals since they were
never certified in the US.

My question is this:

If you modify a production aircraft and call it
"experimental" what flight and/or use restrictions
apply to that aircraft?

Anyone know the rules?

TIA

Don W.