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Thread: Colorado Mountain Flight, Pictures & Stats

  1. #1
    tedwaltman1's Avatar
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    Colorado Mountain Flight, Pictures & Stats

    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%

  2. #2
    irishfield's Avatar
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    Nice data....But did you have a good time Ted!??

  3. #3
    tedwaltman1's Avatar
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    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.

  4. #4
    irishfield's Avatar
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    I'd probably get a nose bleed.... think it's been 15 years since I've been above 3500 feet !

  5. #5
    12Geezer2's Avatar
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    BEAUTIFUL PHOTOS---Thanks for sharing----got to love that clear air

  6. #6
    180Marty's Avatar
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    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.

  7. #7
    soyAnarchisto's Avatar
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    Nice, Ted. Did you cross Milner pass? 65+mph winds at 13k musta been rockin'.

  8. #8
    Speedo's Avatar
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    Quote Originally Posted by soyAnarchisto View Post
    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.
    Speedo

  9. #9
    tedwaltman1's Avatar
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    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.

  10. #10
    soyAnarchisto's Avatar
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    Ted,

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

  11. #11
    tedwaltman1's Avatar
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    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.

  12. #12
    tedwaltman1's Avatar
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    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!

  13. #13

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    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.

  14. #14
    Trout Whisperer's Avatar
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    Looks like a great flight! Thanks for sharing your photos! I lived 38 years in Colorado, and still miss the Rockies.

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