Well I tested my newly made bensonesque 40 gyro and lo and behold...it will fly... soon as I am able to get the blades rotating in the right direction. It runs grat along the ground and the blades slow down and then run backwards. Suggestions from those on hand (thanks for the help everyone) were to limit the teeter and just try and maintain the blades more or less level as there seems to be too much movement.
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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

Ta very big, will give it a try.
I have also made a non-teetering head to see if this helps reduce the amazing amount of movement that it previously exhibited trundling across the desert.