BetaFPV 75mm Micro Whoop Frame for 7x20mm Motors
The strut design is very different and actually creates a complete X all they way back to the battery chamber. The struts between the motor mounts and ducts are fragile and break easily. So these upgraded frames stiffen the struts considerably. The struts themselves have a flat cross section which creates more bonding area with the duct.
Here is the review by krachall at RCGroups.
- 1 * 75mm Tiny Whoop clear plastic frame (for 7x20 motors)