Hello Elf

What incidence do you have the blades set to ?

Although a full size autogyro can autorotate at incidences of +4 degrees and sometimes even higher, sadly this does not work on models. With a flat bottomed section some folks have managed to get their models to autorotate at low positive incidences but only with a really good pre-spin from a motor starter or similar.

All my smaller models have an incidence of about +1/2 a degree. Its difficult to say for sure as the incidence is about 1.5 positive with the blade mounted on its flat bottom, when shimmed to neg 1 measured from the bottom of the chord it comes out about 1/2 positive ??

Without getting bogged down in technical descriptions the simple advice to you is try giving your blades slightly negative incidence, increasing the negative incidence gradually until its enough to initiate autorotation.

Best of Luck

Sean