Zenith Aircraft Builders and Flyers

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Sebastien Heintz

Perfect day to calibrate airspeed

Today was a perfect day to perform flight tests for airspeed calibration of the STOL CH 750 (for ASTM F-2245-05 compliance):

With Roger flying the STOL CH 750, I tracked his speeds with a handheld radar (just like the police use in speed traps). The unit is actually a "stationary Dopplar radar" with a "conical microwave antenna."

With no winds, we tested the aircraft IAS with flaps up and with flaps down (Vso + 5, and all the way up at various increments). Our indicated speeds are quite accurate!

Tags: 750, astm, flight, lsa, radar, test, vs, vso

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Bob McDonald Comment by Bob McDonald on August 29, 2009 at 5:53am
What is the real life cruising airspeed of the CH750 with 100 hp? Are we looking at 80, 85, or 90 mph? I dont think 100 mph is realistic based on my experience with the CH701 series aircraft.
I don't think it would matter if it was a Rotax 912S or Jabiru 3300 as they are both "light weight: engines.
To date I do not think anyone is flying a CH750 with the Rotax 912S installed, but I have seen the CH750 with the Jabiru 3300 engine.
No offense intended...but my CH601HD is as clean as they get (could use wheel pants) and its performance is well below the numbers Zenith publishes for the aircraft with Rotax 912 80 hp. It is still a delightful aircraft to fly and I enjoy it. The Rotax 912 is a miserly fuel sipping, reliable engine...love it.
I just find that "ALL" aircraft manufacturers tend to over state performance numbers...in the same manner car manufacturers add about 5 mpg to the fuel mileage numbers on their cars.

Bob

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