Thanks for your replies.

The commentator at the event said that the Speed Twin was developed for aerobatic training, and two engines were safer for this purpose than singles like the Yak 52.

That’s an interesting argument – the commentator was reading from the notes supplied by the pilot… most people would argue that low level aeros in a twin is much more dangerous than a single. In fact, I asked the pilot what his procedure would be for an engine failure whilst performing (all us display pilots have to account for all sort of failures at any point in a display by the way!), and his answer….. “I’d pull the throttle on both engines and execute a forced landing”…..

Steven: I have a big favour to ask – any chance I could steal the photo of the Yak/Cassutt to put on my web site (http://yakdisplay.com) – and if you feel like sending a reference on the Yak display – feel free: http://yakdisplay.com/references.shtml. Please reply email: nigel(at)yakdisplay.com