Lysander Performance.
For those unaware, the above mentioned a/c was for STOL operations during WW2. It had the engine to drag it through the air at a good speed and the wings and flaps to fly slow.
I believe this a/c was able to cruise up to 4 times it's stalling speed. This was according to a chap that operated the type then. Giving it some thought that is quite impressive even for modern a/c.
Is anyone able to name any other subsonic a/c able to achieve this wide range in speed variation??