On Wednesday, October 9, 2019 at 8:29:35 AM UTC-4, Roy B. wrote:
Dan (5J)
I was talking to some of our club's Junior members (ages 12- 18) once and mentioned a "slide rule". One of the kids asked, "what's a slide rule?" Before I could answer another kid said "It's an old calculating thing - kinda like an abacus."

Sorry, but we are OLD.

I've used all types of varios, including full electronic, and electronic with stepper motor. As long as they move linearly with my 57 mm Winter I have found no difference. While I fly with an LX V9 now, I think the best vario I ever had was my old Cambridge 302. It was great and remained immediately responsive in very weak conditions when you were fighting for survival and a half or a third knot mattered. They did not keep pace as a logger - but they were and remain a great vario.
ROY

glidersource.com Usually a few 302s and 303s available. I have a good 302 (with correct gps date) and a pair of 303 displays I no longer need. Will work better in your glider than on my shelf.

Evan Ludeman