Saberjock,
I scatch built a smaller version of the Dirty Birdie called the Tweedy Bird. On the second flight I put her in a nice easy spin. I don't like more than 3 turns on a new airplane until I am familiar with it's spin recovery characteristics. So at about 2 1/2 turns I started a recovery only to find that it made no immediate change in it's flight. Fortunately, after 2 more turns it recovered and I completed the flight with no problems.
After I landed a fellow club member that had a 60 size D.B. in the past came over and said "Nice spin-my 60 size would do a nice spin and not come out." And I said "Thanks alot for telling me that now, that nice nice spin lasted 2X longer than I wanted." He chuckled and said yea I know, you looked a little busy out there for a while.
My dear little Tweedy was done in by a Transmitter being turned on w/o the Freq. pin. I'm in the process of building another. I guess what all of this is about is that if the 2M D.B. has the same spin characteristics test spin it at a high altitude in the beginning. As I got used to the extra couple of turns in the spin I eventually tried a flat spin. After the rebuild, it flew just as well as before

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Good Luck, I think you'll love it.
Mark