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Thread: Soaring 2/24/2018

  1. #1
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    Soaring 2/24/2018

    Last week we had some a forecast of instability, better than average for this time of year, but last week the forecast included (excessive) wind.

    Tomorrow is similar in stability , or should i say instability, and maybe even more son than we had last week. We won't have the dynamics of converging winds to the extent we had last week.
    I won't bother to replicate the RASP. Check it out for yourself.

    Yup, tomorrow is a specially good flying day WSC at for this time of year.

    Be sure to RSVP, otherwise ...

    • you may not get a tow and
    • you may not get dinner.
    Peter Kelly

  2. #2
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    Re: Soaring 2/24/2018

    I bet the Cortina ridge will be working in the afternoon again.

  3. #3
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    Re: Soaring 2/24/2018

    Quote Originally Posted by lashcraft View Post
    I bet the Cortina ridge will be working in the afternoon again.
    I expect it will, but given the convergence line, and the nice cloud bases, the flight plan might be off tow at 3 Sisters, South to Vacaville , North to Red Bluff and then home. 3.5 hr flt
    Last edited by Peter Kelly; 02-23-2018 at 07:14 PM.
    Peter Kelly

  4. #4
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    Re: Soaring 2/24/2018

    Two of the most significant charts (imho) for 2/24 for making good time while traveling in lift....

    The BS Ratio
    and the
    convergence line (max bl up/down)

    Click image for larger version. 

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    Peter Kelly

  5. #5
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    Re: Soaring 2/24/2018

    Update Saturday AM
    Forget about that post I made yesterday.

    Three things:
    date. pressure patterns (wind). moisture.

    This is Feb, not May. Sun angle is still low and ground is not yet hot.
    Wind is now stronger not weaker.
    Moisture is higher - see blue lines on sounding - see the white sky out the window - see the thermal updraft velocity about 400 at best.

    Good wave climb (Stonyford/ St John area) to 14,000 (higher if you have oxygen) is possible, but just in one spot.
    Click image for larger version. 

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    Cruise south come home on the ridge.
    Good ridge fcst for running the ridge back (and down again to bessa towers in the afternoon.
    Peter Kelly

  6. #6
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    Re: Soaring 2/24/2018

    Flight went according to flight plan and then some.
    Off tow at 7,000 ft
    up to 14,000 headed south at GS of 120 plus.
    Looked for lift at St Helena , then over to bessa Twr , up to rumsey, open spoilers check direction of the surface winds. All good. west at 20 kts
    we ran the ridge several times gap down to Ridge South and back again.
    Thomas made a video
    the track

    Click image for larger version. 

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    Peter Kelly

  7. #7
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    Re: Soaring 2/24/2018

    Sunday morning update on post flight report.

    Yesterday was capped by an excellent presentation by Key Dismukes. To me that was the highlight of the day, but I did fly and had a good flight with Thomas.

    Not to be too blase about it, the flight was all very predictable and way to simplistic of a flight, since I had done so many similar flights in the past and the RASP told us precisely what we would find, but Thomas was there to provide enthusiasm, and he was enjoying the discovery of it all, reminding me of just how special it is - to be able to do what we do in our gliders. A big thank you to Thomas for that. I'll provide details for those that didn't see the obvious on Saturday morning.

    First the RASP charts.

    winds at 10,000 ft. at 1 pm
    Click image for larger version. 

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    See red spot downwind of Snow Mtn - our usual soaring location.

    the cross-section of the wind along the dotted line.
    Click image for larger version. 

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    See the very clear column of rising air on the SE side of Snow Mtn.
    Rate shows it is 700 feet per minute (350 cm/s) in the darkest shading - starting about 12,000 ft
    Lift starts at 5,000 ft at 50 to 100 ft per min, but the rotor clouds are always uncomfortable and it is a struggle when low, so we had Brian put us nearly in the lift at 7,000 ft.
    We didn't want to waste his time by having him drive all the way into the wave, and the head wind was increasing the closer we came to Snow Mtn, so we released at 7,000 and made our way upwind, losing nearly 1,000 ft in the process of getting into the wave.
    Click image for larger version. 

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ID:	4379 I have a dozen more images to post, to explain exiting the wave and then the ridge run. I'll need to add another post to this thread.

    winds at 10,000 ft at 2 pm
    Click image for larger version. 

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    surface winds
    Click image for larger version. 

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    Click image for larger version. 

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    I'll post snaps from the flight track with explanations. Next post. maybe tomorrow
    Last edited by Peter Kelly; 02-25-2018 at 01:20 PM.
    Peter Kelly

  8. #8
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    Re: Soaring 2/24/2018

    couple of photos to show you what is coming...
    but you need to understand the prep that preceded this flying.

    Thomas keeping an eye on the ridge as we travel northbound..
    Click image for larger version. 

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    Click image for larger version. 

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ID:	4382 a snap shot of the front panel
    cruising at 100 kts, altitude 2,600 ft, going up at 200 fpm

    Looking out the window to the right...

    the ridge is right there...
    Click image for larger version. 

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    Last edited by Peter Kelly; 02-25-2018 at 02:11 PM.
    Peter Kelly

  9. #9
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    Re: Soaring 2/24/2018

    Nice flights folks.
    One interesting observation on OLC is that most of your flight traces were cut in the middle. I wonder if this has to do with near zero ground speed. Regardless, you can correct that by editing the flight before the submission deadline, and adjust start to release time and end to landing time. Might as well get the points you deserve.

    Ramy

  10. #10
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    Re: Soaring 2/24/2018

    Peter if possible I would post the videos that Tom took. I think most of us that fly at Williams probably do not realize what a prominent topographical feature the Cortena ridge is, and the videos really show it up close.
    Luke

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