OK... assuming a grossly overpowered scale aerobatic type model.. this will usually do it.. or close....
Establish a 45 degree climbing line, reduce power to say 60% or so, full HIGH rate left roll, After 1 and 3/4rolls, or 2 and 3/4 or 3 and 3/4 rolls.. (Get the 3/4 part?) stab in full HIGH rate down elevator. Some planes like the aileron left in, some don't. some like no aileron, but some left rudder. variations of this will get you into a LOM... often if you hold it, it will decay into a knife edge spin.... if done wrong, you will be in a flat spin!!!
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