While it's big, I'm not sure I'd say it was the "biggest":
[video=youtube;c5FjTcctkC4]http://www.youtube.com/watch?v=c5FjTcctkC4&feature=related[/video]
[video=youtube;H5XDdRV_scw]http://www.youtube.com/watch?v=H5XDdRV_scw&feature=related[/video]
This guy could seat his kid in this one:
[video=youtube;Jw5OWalC4-4]http://www.youtube.com/watch?v=Jw5OWalC4-4&feature=related[/video]
Dang, this may be RC, but it's pretty much an ultralight:
[video=youtube;-IwmUwkULxQ]http://www.youtube.com/watch?v=-IwmUwkULxQ&feature=related[/video]
Another biggie, look at the Volvo beside it for a sense of scale:
[video=youtube;L5f8Df3Uym4]http://www.youtube.com/watch?v=L5f8Df3Uym4&feature=related[/video]
Here's the Mitchell again, check out the cool video "stop effect" of the spinning prop on number 1 engine:
[video=youtube;bAC5UgrigCA]http://www.youtube.com/watch?v=bAC5UgrigCA&feature=related[/video]
Mega cool B52:
[video=youtube;fbITzCI2AU0]http://www.youtube.com/watch?v=fbITzCI2AU0&feature=fvw[/video]
My personal favorite, the "Peacemaker":
[video=youtube;-uCAQJyVE5E]http://www.youtube.com/watch?v=-uCAQJyVE5E[/video]
[video=youtube;qibSEcZQR24]http://www.youtube.com/watch?v=qibSEcZQR24&feature=related[/video]