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!

Views: 299

Comment

You need to be a member of Zenith Aircraft Builders and Flyers to add comments!

Join Zenith Aircraft Builders and Flyers

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

New from Zenith:

Zenith Aircraft For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

                                                     

Weather Maps


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.


Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits


Zenith Apparel from EAA:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

 

Zenith transition and Sport Pilot training:

Quality Sport Planes
Cloverdale, California:

Wheels & Wings

Pro Builder Assistance

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service