well i just had my first flights with my 3demon today. with hi-tec225 servos all round and a irvine 39 engine and 12.25x3.75 prop.
it flys slowly just like a 3d plane should. today i flew it in around 15mph wind. had triple rates setup. on max roll rate was fast but i think i'll increase it a bit. elevator was good but to much and it skeuwed in on its self. but it was good rolling circles/curcuits were fun either with minimum rates or with them turned up. rudder helped them flying them slow. on a carm day i expect it will do rolling harriers well. knife edge it didnt like to much lots of coupling and with the rudder same throws both sides it wouldn't maintain left knifeedge as well as right. prop hangs nicely but i would like more throws all round for a windy day but normal max throws as sugestet in the book are pritty much on the money. if the weekend is nice in cold old southern england i'll fly her somemore and get some more info about it.