That said, there are some subtle changes. The white EPP foam seems to be a bit stiffer and lighter than the original black stuff used on the Zagi. It does though still transform into electrostatically charged beads when you start to excavate recesses for servos etc. The Genesis also has a 5mm carbon tube spar, whereas the Zagi, somewhat surprisingly, had no spar at all. The planform is slightly different too - the elevons are shaped to give more surface at the outboard end and the wing taper is less on the Genesis.

A 1/16in play plate is also applied to the underside of the nose, although I replaced this with one cut from 1/32in ply to reduce the aerodynamic intrusion - I drew the line at trying to recess the ply into the foam!

The only other change I made was to align the pushrods with the airflow rather than at right angles to the hinge line as shown in the instructions. I appreciate that, from a linkage geometry viewpoint, the latter has advantages but I think it looks better with everything pointing in the same direction - and might be marginally aerodynamically cleaner too.

The last job was the taping and covering. I made sure the underside was very different from the top - and that it should be pretty visible, both in the air and when being retrieved from gorse bushes!

The Genesis is a couple of inches shorter in wingspan than the Zagi but came out with a lower wing loading, partly due to more sparing use of the crossweavetape (the Zagi was taped all over, no doubt partly because of the absence of a spar). First impressions are that it flies very well. Slightly more efficient in marginal lift and without the wing rocking that the Zagi can experience when flying slowly.

Here's hoping that it will have the same longevity too!

Footnote: The wrong wing panels were orginally supplied for this model, with the result that I ended up building the electric version too. So, for more build photos, see here.