I wish you could post some more photos of your setup. This looks super interesting, but I am having trouble visualising what you have done here.
While many of the papers listed are interesting, my feeling is that they are a bit off. Here is my thinking on the subject (which I hope may be useful for your project):
- like a wing for a plane, keep the aspect ratio long, eg >5 to mininize the effect of the tips
- the different technologies datreius, savonius and magnus cylinder all have slightly different optimal TSR. The diameter should be matched so that each section is running optimally (eg a savonius rotor should have 1/4 radius of a darreius rotor, or similar radius to a magnus wing)
- the area of the kite must be dimensioned so that the power into the magnus wing section(s) must be equal to the power generated by harvesting sections
I am assuming they are all fixed relatively in rotation sharing a single shaft.
The TSR values and harvesting energies may all be found by looking up tables.
Interestingly, the optimal harvesting device here is not the one approaching the Betz limit, rather the one producing most power for the least drag and weight. Probably this would mean high efficiency wings, I believe favoring a HAWT over darreius over savonius. And actually I believe a scaled down turbine like @Rodread’s Daisy might be a good option, with a gearbox.
So I just introduced using rotational AWE systems for on-wing power harvesting.
Let me explain some reasons why:
- weight to power may be excellent
- the turbine will self inflate and find its own shape without further rigid structure
- you are not looking to go high altitude
- you probably dont need the lifter, or at least it may be tiny
- with effective blades, the drag should be the smallest of the competing options (that I am considering right now)
Super envious that you are getting some testing done. Looks like fun. Unfortunately I am super time constrained these days myself…