We talked with Capt. John Powers, a 747 check pilot from Ridgefield, Connecticut, who spent a day installing the LRI in his classic Cessna 170. He says the only installation problem was translating engineering language to pilot language. His wife was in the process of getting her private license in the taildragger when the instrument was installed, and she is now working on her instrument rating.
According to Morgan Huntington, "partial panel IFR is a 'breeze' flying with the LRI because this single instrument regulates airspeed, precisely controls aerodynamic pitch - and because its uniform indication ensures constant density altitude for any power setting."
Powers says he is very impressed with the LRI on both takeoff and landing. Flying in wind-shear conditions, the 747 captain said, "I was much more confident with the LRI than with the airspeed. (You get) quantitative information that can be predictably reproduced. One very blustery day going into the Brandenburg Airport in Kentucky, there were rain squalls with a speed variance of as much 10 mph. The LRI had a very quick response, much like a flight director. I'm pretty well sold on the thing."
"You don't have the excessive two to three-second lag found in the airspeeds," he says. "It's very impressive and easy to fly."
Private Pilot - February 1987