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2023/09/30 Fast Toys Track Day at Thunderhill with the F488
π 2023-09-30 01:01 in Ncars
I was excited, this was finally a chance for me to try the F488 at thunderhill to see how it and I did on my home track.

Flight was nice and uneventful, thankfully no overcast in the morning:




trying a new $69 10 tablet
trying a new $69 10 tablet

Once at Thunderhill, as usual, it took me a while to re-learn the track, because I was rusty, and somehow got down to a 1:%3 after a few laps although the car had several seconds left in it. Laptimes were: 1:58, 1:59, 1:57, 1:54, 1:54, and 1:53:

Unfortunately, despite the day staying cool, the first set of tires went down while I was relearning to go faster, so my best time got down to 1:57. I then got the tires set to another used set, but they weren't that great either, and got stuck at 1:57 and couldn't get faster both due to grippier tires and lack of guts to go deeper in some turns where I could definitely have gone a bit deeper. I didn't feel my best and I guess it was overall a good idea that I didn't push it. Here's the last session:

The flight back was more interesting than planned, half the bay area was socked almost to the ground, so I had to fly around via livermore, and was unable to descend to cross the bay towards PAO without getting into Bravo airspace for which I was denied clearance, so I had to fly a fair amount further south, cross south of San Jose, and then fly back in towards PAO which worked out ok. There was a good crosswind on landing but I thankfully kept the motor skills and landed straight on centerline.



Travis AFB
Travis AFB



happy to be on the ground
happy to be on the ground

2023/09/22 Testing 1.5V AA Lithium Batteries
π 2023-09-22 01:01 in Electronics, Public
Lithium Batteries have a voltage between 3V and 4.1V, but recently they have been turned into the 1.5V form factor with some electronics that step them down to 1.5V and custom chargers that know how to recharge them via a special protocol, or for the EBL batteries, they have a micro USB plug onboard.

They are of course not all the same real usable capacity, and I've learned not to trust vendor capacity claims anymore either, due to the amount of sellers that plain lie on amazon. The good news is that Neither Xtar nor EBL lied about their cell capacity as long as you understand that the actual energy you can output will be lower due to conversion losses and some safety buffer to give the cell longer longevity.

https://docs.google.com/document/d/1z9o7O5o70SxJnQwKHJD8JdlPdScZZ1o09scHqUlDxeE/edit?usp=sharing

Here is a quick summary without pictures:

New Xtar: Rating: 4.15Wh, Charge: 5.5Wh, 3.45Wh Usable discharge at 1A

  • https://www.amazon.com/gp/product/B0CF8ZNZ33/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
  • Summary:
  • This is the only lithium battery that drops its voltage to 1.1V to give you a low voltage warning. Other batteries I tested just die with no warning. That alone is a reason to select it. I tested it with my garmin GPS and it gave me 2H of low battery warning before finally dying. Very nice!
  • It is also the battery that gave me the most actual discharge capacity
  • Seller is not lying about cell capacity (thank you) which of course is higher than actual usable energy due to conversion losses
  • New charger is unfortunately bigger than the old one and drops the USB-A output feature to use your batteries as an emergency USB charger
  • Verdict: this is the best battery I tested and what you should buy as long as you don't need a built in charger like EBL
  • Old Xtar: Rating: 3.3Wh, Charge: 5.3Wh, 2.7Wh Usable discharge at 1A

  • https://www.amazon.com/gp/product/B09NLVJDY6
  • Summary:
  • This is the older Xtar battery. It had best in class capacity until the newer one that came out with added low voltage warning. There is no good reason to buy this battery anymore, get the new one.
  • Its capacity is equivalent ot the EBL battery with built in USB charging, so the EBL is more versatile
  • The charger is very compact and can act as a USB power source, that's a nice feature.
  • 10.6Wh to charge 2 batteries, or 5.3Wh charge per battery

    EBL 3.3Wh rating, Charge: 4.3Wh, 2.7Wh usable discharge at 1A

    # https://www.amazon.com/gp/product/B08RZ5NDMM

    Summary:

  • There is no low voltage warning, but the battery capacity is actually equivalent to the old Xtar despite the space lost to the built in charger. The new Xtars last longer than the EBL though.
  • Interestingly EBLs need less energy to charge than Xtar for the same output capacity, they are more efficient
  • Big warning: if you try to charge the batteries via USB while they are in use, they are going to output 5V instead of 1.5V. This is unexpected and fried one of my GPSes. You cannot charge them while they are being used.
  • Deleepow 3.4Wh rating, 3.8Wh charge, 2.4Wh usable discharge at 1A

  • https://www.amazon.com/gp/product/B09NLXQRP3
  • Summary:

  • These battery are not for sale anymore, and they were the least performing amongst the ones I tested.
  • The 3.4Wh cell capacity is probably untrue with the charge and discharge numbers I got
  • See more images for Testing 1.5V AA Lithium Batteries
    2023/09/13 5 Days around Mammoth: Agnew Meadows to Duck Lake Pass with Arturo
    π 2023-09-13 01:01 in Hiking
    This is what we did:

    and this is the plan that Arturo made with altitudes:



    Here are the stats retrieved from Garmin Connect:

                            Move Ovrl      Avg Max
         Dist    Time  Move Avg  Avg  Cal  HR  HR  Climb  Desc
    Day1  6.09   4h11  3h02 2.3  1.9  1408 113 146  1711   472
    Day2 10.69   8h28  5h12 2.1  1.3  2456 107 149  2088  2306
    Day3 14.45   8h45  5H05 2.3  1.7  2349 105 141  2391  2674
    Day4 11.54   7h06  3h52 2.8  1.6  3980 109 144  2389   859
    Day5  5.30   2h36  2h13 2.4  2.3   628  94 138   492  1865
    Tot  48.07  30h46 19h24 2.4  1.7 10821 105 143  9071  8176
    (totals/averages computed through https://docs.google.com/spreadsheets/d/1hu2toMis2o-FNpR9gDjq7K8zvUe9o4mLiw6mcqi3_Pw/edit?usp=sharing )

    I got new more expensive and newer gear to be lighter, this time I had:

  • 19lbs backpack with gear (new lighter tent, thermarest, and sleeping bag, as well as a new lighter gas stove. Also took a single kevlar ursack to save more weight)
  • 5lbs Fanny pack (mmh, ok, I guess I need to work on that, haha)
  • 5lbs food
  • My new total load was 29lbs without water, a new record, although I can likely still shed some stuff, but I'm happy I brought the clothes I did, because the new REI 30F dawn sleeping bag was totally not warm enough and I had to wear all my clothes in it when it froze overnight.
    Hiking with the lower weight and just a single aleve every day made a big difference, no need issues/pain at all during all 5 days!

    Day 1: Flying to Mammoth and Cab to Agnew Meadows

    We flew to Mammoth which was an easy and scenic 1h20 flight instead of a 6H+ drive.










    fun to see Mammoth with a little less snow :)
    fun to see Mammoth with a little less snow :)

    gondola still running
    gondola still running


    Day 1: Agnew Meadows to Badger Lakes (6mi)

    Day one was a short day since we flew at Mammoth airport that morning and got dropped off at the trailhead around 12:30. Not bad given that we were still in the bay area that morning. After an expensive cab ride to the trailhead, we went on our way. Pretty easy 6 mile hike uphill. We arrived at Badger Lakes well before sunset:




    assassin fly eating an ant, had never seen that before
    assassin fly eating an ant, had never seen that before



    still nice flower in september!
    still nice flower in september!

    my lightweight tent
    my lightweight tent

    lake looks better around sunset
    lake looks better around sunset

    temperature dropped quickly + mosquitoes, so I put extra layers
    temperature dropped quickly + mosquitoes, so I put extra layers

    beautiful sunsets
    beautiful sunsets

    spent another hour hiding from mosquitoes and mostly staying warm in the tent and Arturo got this nice shot with his phone
    spent another hour hiding from mosquitoes and mostly staying warm in the tent and Arturo got this nice shot with his phone

    Day 2: Badger Lakes to Rosalie Lake (9.7mi)

    Next morning, I was up by 06:00 after a not so great night, I was cold all night due to a mistake in the sleeping bag I bought (rated for 30F but really it's more 45F and above). Nice mirror lake view before the wind got up:

    Google Pixel Pro
    Google Pixel Pro

    Samsung S23
    Samsung S23

    Panasonic ZS200
    Panasonic ZS200

    This trip was also a good reminder that for day pictures, phones (Samsung and Google Pixel) end up doing much better HDR, and other AI magic than my now old and yet expensive, cameras. What a shame for Sony and Panasonic, but this is progress...



    stream crossings were not bad
    stream crossings were not bad

    a lot of log briges did collapse under the last winter's amazing amounts of snow
    a lot of log briges did collapse under the last winter's amazing amounts of snow

    speaking of snow, there was plenty left that hadn't melted yet
    speaking of snow, there was plenty left that hadn't melted yet

    wait, why is Arturo throwing ice/snow at me again? :)
    wait, why is Arturo throwing ice/snow at me again? :)

    I'm not sure how, bur Arturo managed to talk me into going in a lake, because "it wouldn't be sooo cold". Well, it was!



    He did better in the water than I did
    He did better in the water than I did

    Got a few shots of bugs on the lake rocks:


    I always love the blue dragonflies
    I always love the blue dragonflies


    tad poles
    tad poles


    and cute chipmunks, small squirrels with ADHD :)
    and cute chipmunks, small squirrels with ADHD :)

    More nice views:










    We didn't get much bigger wildlife, but one deer briefly came to see us at night:


    it was cold to get out for pictures at night, but got one shot with my phone
    it was cold to get out for pictures at night, but got one shot with my phone

    Day 3: Rosalie Lake to Crater Creek (through Devil's Postpile and Reds Meadow)(13.4mi)

    Next morning we got up a bit earlier for the longer day and stops at red meadows and devil's postpile. It was still cold, but nice views:





    Normally you have no cell during a backpacking trip, but during most of this trip, we could see the Mammoth Gondola top, which did give slow but workable signal:


    I pointed out to Arturo that we couldn't hike in the area and not see Devil's Postpile :)
    I pointed out to Arturo that we couldn't hike in the area and not see Devil's Postpile :)


    from the tail, it looks like an F35 more than an F22
    from the tail, it looks like an F35 more than an F22

    hello!
    hello!

    early lunch break on the top of the geological formation
    early lunch break on the top of the geological formation





    From there, I suggested a stop at the Reds Meadow, a JMT/PCT resupply point, because why not? :)




    so I had a slightly better lunch ;)
    so I had a slightly better lunch ;)

    they were closing the next day, ice cream half off, everything must go! :)
    they were closing the next day, ice cream half off, everything must go! :)


    After a nice break, we continued the hike to do almost 14 miles:



    another bridge damaged by snow
    another bridge damaged by snow

    Eventually made it to a creek crossing with godd campsite spaces:

    spider came to say hi
    spider came to say hi

    another nice shot of me hiding in my tent, from Arturo
    another nice shot of me hiding in my tent, from Arturo

    Day 4: Crater Creek to Pika Lake (11.5mi)

    Day 4 had a lot of climbing but wasn't long, it was an easy day.


    found this little guy
    found this little guy


    crossed 10,000ft a few times during the day, not a terrible climb though
    crossed 10,000ft a few times during the day, not a terrible climb though

    Duck Lake
    Duck Lake

    Yes, it's pretty! :)
    Yes, it's pretty! :)

    and it had ducks for real!
    and it had ducks for real!


    We did opt for Pika Lake, because it would have Pikas, right? Sadly we didn't get lucky and didn't see any.


    on to Pika Lake, a bit higher (over 10kft)
    on to Pika Lake, a bit higher (over 10kft)





    due to the altitude, it got cold quickly, thankfully no mosquitoes at that altitude
    due to the altitude, it got cold quickly, thankfully no mosquitoes at that altitude



    I tried a few night pictures:



    Day 5: Pika Lake to Duck Lake Pass (5.3mi)

    Despite sleeping with all my clothes (2 pants, 4 pairs of socks, 4 top layers, hat, and gloves), it was still cold. My sleeping bag didn't do the job, sadly. The next morning I also found out why there were no mosquitoes: it was freezing at night, which does kill them:

    by the 5th day, my body mostly had gotten used to the altitude and my SPO2 had gone back up a few points
    by the 5th day, my body mostly had gotten used to the altitude and my SPO2 had gone back up a few points


    sure enough, everything was covered by frost the next morning
    sure enough, everything was covered by frost the next morning

    on the plus side the lack of wind gave nice mirror shots
    on the plus side the lack of wind gave nice mirror shots



    We then walked up to the pass exit, got some cell signal to order a taxi to pick us up, and we walked down in under 2H:


    yes, still snow
    yes, still snow

    some trails from Mammoth
    some trails from Mammoth



    and we got to the bottom
    and we got to the bottom

    Day 5: Flight back from MMH to PAO

    After getting a cab back to Mammoth airport, we were lucky to have mild winds, making the traverse back not so bad. If the winds are strong, it's between unsafe and impossible to cross back in a small plane due to mountain waves. Luckily, we had a pretty flight through yosemite:



    flew towards mono lake to pick up altitude
    flew towards mono lake to pick up altitude

    Lee Vining
    Lee Vining


    Half Dome
    Half Dome





    SJC
    SJC






    Thanks a ton to Arturo for making this happen.


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