I have just published a 1 minute video ( so not to bore you ) of how I think the teeter head works,,, 


https://youtu.be/8VqmccIbvcg

I have just come across this build thread and would like offer some guidance gained from 4 years of building and flying gyros which I started with building the Rich Harris RPG. Your design is similar to the Cranefly. Watching the hops video I would suggest the following mods. Increase motor downthrust. Suspend the model from the rotor spindle and Look for a hang angle of between 15 and 18 degrees. Trim in left rotor roll of around 5 degrees for the first hops. Our most successful rotor profile is the ClarkeY modified by drawing a line from leading edge to trailing edge to give a flat bottom and SHARP leading and trailing edge. Assuming both blades weigh the same, we balance for a cg lengthways that is on the centre of lift of the blade profile. This is usually around the thickest part of the profile. This is key to give the blades equal  lead and lag, you will understand the importance of this. Also with 2 blade designs you need far less pitch and roll movement to prevent over control which will stop the blades. Another requirement of 2 blade set ups is to increase the tip weight of the blade to reduce coneing and increase the gyroscopic effect of the rotor. This often means the blades struggle to get up to speed, hence the need for pre rotators. Lastly if a model goes nose vertical on lift off it is nearly always because of too much lift, rolling left is always due to insufficient lift. Hope this helps.


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What are the dimensions of your blades? To give you an idea on a whippet or whippet derivation we are using a 3 blade set with modified clarke y, 60 mm wide x 6 mm deep x 40cm long with no shim. We are in the process of developing a 3 d printed sectional blade.
On my biggest gyro, a DAG 60, with a weight of 14lbs I use the same section blade, 70mm wide, 10mm thick, 1 meter long. No shim. https://youtu.be/hdCaa-UGBSE

Another video by a mate Rich Harris the designer of the RPG et al testing a teeter head https://youtu.be/fxPxKqnJIUk


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Thanks,
    I will have a look when it rains,,, my home made 2 bladed heads have always worked may I say 'well', but my 3 bladed ones have always been a headache.