One aspect of flying the zephyr that need to be emphasized is that while the Zephyr will snap and spin -- it must be done with extreme caution. The zephyr very easily will get into a perfectly flat spin with rotation about the fan/Cg. This is next to impossible to correct unless the pilot knows about severe spin correction.
1. cut throttle
2. wait for the nose to drop
3. correct for rotation (counter so there is no rotation)
4. throttle up
5. pull up... but not until sufficient flight speed is attained.
6. restore normal breathing.
The zephyr requires over 100 feet for flat spin recovery and that's a long time for one to hold their breath.