View Full Version : Colorado Mountain Flight, Pictures & Stats

11-23-2014, 06:45 PM
Flight over the Continental Divide & around the high peaks of Colorado on Nov 8th.

Slideshow: http://www.eaerofab.com/MtnTour2014/index.html

Stats from Dynon Skyview data download:

Highest ground speed: 155.7 mph when the true airspeed was 98 mph = a 57 mph tailwind!
That 155.7 ground speed was at an altitude of 13,538' over the continental divide
Highest altitude on the entire flight was 14,859'
One bump was 2 G's (not bad at all really)
Lowest temp was 23
Highest climb rate was 1,659' per min when we were at 13,423'
Fastest descent rate was -1,507' per min when we were at 13,546'
The system recorded 32,876 rows of data at 2 points per second for a flight time of 4 hours & 34 minutes
The system calculates % power--the highest recorded is 85% at takeoff (of course) from our field at 4,960'
Percent power taking off from Leadville, CO at 9,934' was 67%

11-23-2014, 07:29 PM
Nice data....But did you have a good time Ted!?? :lol:

11-23-2014, 07:39 PM
Thanks for asking! I had a GREAT time except for about 5 minutes before I tried to cross the divide when I got on the lee side and was headed downhill big time in the wind.

11-23-2014, 07:41 PM
I'd probably get a nose bleed.... think it's been 15 years since I've been above 3500 feet !

11-23-2014, 08:26 PM
BEAUTIFUL PHOTOS---Thanks for sharing----got to love that clear air

11-23-2014, 08:37 PM
Very nice. I remember flying up from Laughlin NV to Grand Junction. We were going to go on to Centennial airport but as we flew I 70 could see Leadville so took a detour and got a certificate from Ursla. Took off from Leadville, popped up to 14000 and direct Centennial. Not a bump in the sky that Feb day in 1991.

11-24-2014, 12:50 AM
Nice, Ted. Did you cross Milner pass? 65+mph winds at 13k musta been rockin'.

11-24-2014, 08:33 AM
Nice, Ted. Did you cross Milner pass? 65+mph winds at 13k musta been rockin'.

I used to live at Milner Pass during the summer. That was back in the early 80's. Had a lot of fun exploring the area.

11-24-2014, 09:35 AM
Yes, crossed over near Milner Pass--just to the S of it I think. We hit a couple of big bumps with the wings moving, but not as bad as one might have expected.

01-05-2015, 01:26 PM

How do you get 85% power at our elevation here? Seems like you'd be making too much at lower elevation no?

01-05-2015, 03:35 PM
I just re-checked my Dynon download file. BTW, I also checked that I have the right initial parms loaded in my engine configuration file.
Pressure Altitude: 4575, OAT 5C, Barometer: 30.31, Density Altitude 4426, RPM 2625 (should be 2700 of course; adjustment needed on throttle body), Manifold Pressure: 25"
Percent [computed] power 85%. I'll recheck the actual performance chart with the above #'s in the Lycoming manual.

01-05-2015, 04:22 PM
I was trying to figure out and cross reference with the Lycoming Operator's Manual chart...but then I realized that it is published for an IO-360 (180 Hp) whereas I have an IO-375 (205 Hp).

Anyway, that's (the 85% that is) what my Dynon computed. If someone can point me to a chart or formula specifically for an IO-375B1B that would be awesome!

01-05-2015, 09:39 PM
85% power seems very reasonable. In general our normally aspirated engines, lose about 3% power per 1000 feet of altitude gained. About 5000 msl = about 15% loss.

Trout Whisperer
11-29-2015, 11:08 PM
Looks like a great flight! Thanks for sharing your photos! I lived 38 years in Colorado, and still miss the Rockies.