Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: Flying Sunday 6/3

  1. #1
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Flying Sunday 6/3

    Great day to fly - a bit challenging, and we (I) did make a few errors in judgment or one, for sure.
    Wrong day to try to go to the Trinity Alps.
    Started the engine at Weaverville.
    You all now have a very good quality training film to review before your next flight. Maybe I'll get it on you tube.

    See flight log...
    Attached Files Attached Files
    Last edited by Peter Kelly; 06-04-2018 at 12:26 AM.
    Peter Kelly

  2. #2
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Re: Flying Sunday 6/3

    Tow by Rex - nearly to Tree farm, off at 6,100 ft

    Click image for larger version. 

Name:	t1.PNG 
Views:	119 
Size:	215.7 KB 
ID:	4535

    Six turns and we are leaving at 8000 ft

    Click image for larger version. 

Name:	t1-6 turns to 8000.PNG 
Views:	143 
Size:	217.5 KB 
ID:	4536

    Arrive at St John Mtn for thermal 2 at 13 kts...

    Click image for larger version. 

Name:	t2 arrive st john at 8000 into 13 kt thermal.PNG 
Views:	128 
Size:	273.5 KB 
ID:	4537 depart after 7 turns at 11,500 ft Click image for larger version. 

Name:	t2 seven turns to 11500 ft.PNG 
Views:	144 
Size:	273.8 KB 
ID:	4538

    Thermal 3 near M3 up to 12,000

    Click image for larger version. 

Name:	t3-five turns- near 12000.PNG 
Views:	150 
Size:	296.9 KB 
ID:	4539

    the track. Except for our excursion to the Trinity Alps, we flew from cloud to cloud all day long. Good lift markers. Coming back home the line of lift shifted to the east

    Click image for larger version. 

Name:	track.PNG 
Views:	383 
Size:	581.9 KB 
ID:	4541
    Peter Kelly

  3. #3
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Re: Flying Sunday 6/3

    Couple of screen saves from the video....

    Leon doing the flying as I video to the south - see cu clouds near Alder Springs behind the left wing.
    Click image for larger version. 

Name:	Leon taking us past Black Butte.jpg 
Views:	138 
Size:	95.7 KB 
ID:	4542

    camera out the window (at 80 kts!) - better view to the south
    Click image for larger version. 

Name:	looking back to the south.jpg 
Views:	142 
Size:	103.7 KB 
ID:	4543

    Cloud before M3, Leon is flying and he is going to for it!

    Click image for larger version. 

Name:	cloud m3.jpg 
Views:	151 
Size:	63.3 KB 
ID:	4544

    Good coordination and speed control - Leon is making nice green circles on the screen... Click image for larger version. 

Name:	55 kts-500 FPM - 11 ft - green dots show the lift.jpg 
Views:	136 
Size:	97.1 KB 
ID:	4545


    Nearly 3 PM, after being shot down over the T-Alps, we get up close and personal with Weaverville

    We are at 5,000 ft
    Note the absence of clouds over the T Alps to the north, and note the many shadows from the alto cu.

    Weaverville Runway - Elevation 2350 ft, length 3,000 ft
    DUE TO STEEP RUNWAY INCLINE, USE RUNWAY 36 FOR ALL FLIGHT OPERATIONS

    Click image for larger version. 

Name:	weaverville1.jpg 
Views:	396 
Size:	116.6 KB 
ID:	4546
    Peter Kelly

  4. #4
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Re: Flying Sunday 6/3

    The lift was accurately predicted by the RASP.

    Where the surface winds came together - that was the lift line.
    Click image for larger version. 

Name:	sfcwind.curr.1400lst.d2.png 
Views:	127 
Size:	53.0 KB 
ID:	4547 Click image for larger version. 

Name:	sfcwind.curr.1600lst.d2.png 
Views:	143 
Size:	53.0 KB 
ID:	4548

    The forecast for cu was right along that line

    Click image for larger version. 

Name:	zsfclclmask.curr.1400lst.d2.png 
Views:	144 
Size:	28.5 KB 
ID:	4549 Click image for larger version. 

Name:	zsfclclmask.curr.1600lst.d2.png 
Views:	129 
Size:	27.9 KB 
ID:	4550

    "Convergence" line reaffirms it as well

    Click image for larger version. 

Name:	wblmaxmin.curr.1400lst.d2.png 
Views:	111 
Size:	40.0 KB 
ID:	4551 Click image for larger version. 

Name:	wblmaxmin.curr.1600lst.d2.png 
Views:	145 
Size:	40.8 KB 
ID:	4552
    Last edited by Peter Kelly; 06-04-2018 at 09:59 AM.
    Peter Kelly

  5. #5
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Re: Flying Sunday 6/3

    The wind was a big factor

    No lift (upward vertical velocity) of the wind at 10,000 ft on the west side of the Mendo ridge - it was all to the east side, and more predominant later in the day as the line shifted eastward.

    Click image for larger version. 

Name:	press700.curr.1400lst.d2.png 
Views:	118 
Size:	46.2 KB 
ID:	4553 Click image for larger version. 

Name:	press700.curr.1600lst.d2.png 
Views:	172 
Size:	47.0 KB 
ID:	4554

    I did not capture the BS ratio but you would see very low numbers to the west side of the "convergence" line.

    I did look at the cross section along that dashed line at 1400.
    Lift was strong on the downwind side of Yolla Peak up to 11,000 ft and you could work it to 15k if you were interested ( and had some oxygen available).

    Click image for larger version. 

Name:	boxwmax.curr.1400lst.d2.png 
Views:	140 
Size:	23.9 KB 
ID:	4555
    More telling, is that the wind was in fact creating a line of wave lift within that convergence line, so you just had to follow the ridge lines pretty closely.

    If I had the soundings you would see the air was generally stable. Lower atmosphere (up to 10,000 ft) was a lot of warm air, so the thermals were only strong in the convergence line. Leon and I had a lot of climbs with the vario singing strongly with 9 to 15 kts indicated in the climb. Fun stuff, banking hard, pulling G's, circling at 55 kts as the altimeter increased 3 or 4 hundred feet every circle. 3 or 4 turns per thousand feet.

    It was obvious i had not evaluated a trip past the end of the convergence line at Hay Peak.
    Not planning ahead is just a dumb thing to do, when the info is right there on the screen before takeoff.



    Click image for larger version. 

Name:	t alps winds at 10000 ft at 4 pm.PNG 
Views:	381 
Size:	81.7 KB 
ID:	4556

    A closer look, comparing 10,000 ft winds and vertical speeds to the track...

    track in See You in red with altitudes
    white lines are lat/ long at 41N and 123W - 122W

    Click image for larger version. 

Name:	talps 12000.PNG 
Views:	139 
Size:	909.0 KB 
ID:	4557 Click image for larger version. 

Name:	talps 10000.PNG 
Views:	134 
Size:	306.4 KB 
ID:	4558 Click image for larger version. 

Name:	talps 5200.PNG 
Views:	127 
Size:	333.4 KB 
ID:	4559 Click image for larger version. 

Name:	color vv scale.PNG 
Views:	117 
Size:	5.4 KB 
ID:	4561

    Note the color scale on the chart tells the casual observer that the vertical velocity is 50 feet per minute going DOWN when the color is light blue (-25 cm/s). Even greenish-blue is descending air. I was still in the going down air as I retreated to Weaverville. I should only fly within the planned flight plan area, and don't impulsively go off into areas I have not evaluated before takeoff. i didn't plan to go past Hay Peak in the first place, so I had not evaluated the forecast up in that area.

    Red line shows the track and the numbers show the altitude at the select points.

    Click image for larger version. 

Name:	winds at 20 with track with altitude 12 - 10 - 5.PNG 
Views:	377 
Size:	457.8 KB 
ID:	4560
    Last edited by Peter Kelly; 06-04-2018 at 11:20 AM.
    Peter Kelly

  6. #6
    Join Date
    Oct 2017
    Location
    Berkeley CA
    Posts
    14

    Re: Flying Sunday 6/3

    Peter , I will be spending the next few days dissecting the above data. I never before appreciated the enjoyment and beauty that accessible by way of convergences. I have a lot to learn & practice (all the better). Thanks again for creating the opportunity to experience the art, the excitement, and the challenges of convergence soaring over the most beautiful mountainous area I've ever seen. Leon

  7. #7
    Join Date
    Mar 2015
    Location
    Santa Rosa
    Posts
    220

    Re: Flying Sunday 6/3

    Peter, Great report, especially the RASP analysis! Very much appreciated by those of us still struggling to trust the RASP and understand all of the valuable information presented.

  8. #8
    Join Date
    Oct 2015
    Location
    SF/WSC
    Posts
    21

    Re: Flying Sunday 6/3

    +1 - Bookmarked the thread and added to my weather analysis library.

  9. #9
    Join Date
    Aug 2016
    Location
    Placerville, CA
    Posts
    4

    Re: Flying Sunday 6/3

    Jealous! And I had to be in Santa Monica that day :-(

  10. #10
    Join Date
    Jan 2011
    Location
    Schleicher ASW-24
    Posts
    2,103

    Re: Flying Sunday 6/3

    I suspect it would be more helpful if we had certain threads by subject, rather than buried in a post-flight analysis report such as this one. Besides, we could have a bit more focus to the discussion and other pilots could contribute to a more open discussion of concepts.

    I think I'll start with the subject of "convergence".

    Go to the "Convergence" thread at

    https://www.williamssoaring.com/news...72-Convergence
    Last edited by Peter Kelly; 06-06-2018 at 02:53 PM.
    Peter Kelly

Similar Threads

  1. Flying Sunday, 7/1/18
    By Peter Kelly in forum News & Discussion
    Replies: 11
    Last Post: 07-15-2018, 03:17 PM
  2. Flying Sunday, 7/8/18
    By Peter Kelly in forum News & Discussion
    Replies: 11
    Last Post: 07-10-2018, 05:19 PM
  3. Flying Sunday 4/23/17
    By Peter Kelly in forum News & Discussion
    Replies: 2
    Last Post: 04-23-2017, 10:17 PM
  4. Sunday 3/30 flying
    By Sergio Colacevich in forum News & Discussion
    Replies: 7
    Last Post: 04-02-2014, 04:42 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •