FPV.
Freestyle, long range, blackbox analysis. Flying in Graubünden as practice.
Betaflight on a 5-inch, GPS rescue on a long-range wing, blackbox logs reviewed obsessively after every session. The mountain is the debugger.
5" freestyle: HQ 5x4.3x3 vs. Gemfan 51433 — alpine conditions
Ran both props back to back on the same tune in the same field. HQ wins in wind. Gemfan has better punch in calm air. I'm keeping HQs on this build.
Piz Beverin — 3.4km out, returned
3.4km out-and-back over the Beverin, 680m of altitude gain, no signal loss. The mountains are the best antenna range test there is.
New 2207 motors on the 5" long range — quieter, more efficient
Swapped to 1750kV 2207s on the long-range 5". Gained 4 minutes of flight time. Lost the characteristic scream. Worth it.
5" freestyle: PID retune after frame swap
Swapped to a stiffer carbon frame after a crack in the old one. Had to retune from scratch — the resonance profile was completely different.
Long range wing: tuning GPS rescue for mountain terrain
Default GPS rescue parameters are tuned for flat terrain. In a valley with ridges on three sides, they'll fly you into a hillside. Notes on what to change.
Long range wing: ExpressLRS 868MHz setup and binding
First flight on ELRS 868MHz. Replaced a 2.4GHz Crossfire setup — better penetration in the canyon sections, same telemetry quality.