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Posts posted by ThrustVectored

  1. I started with a Silhouette 170, it shares the Airfoil of the Sabre 2, however it is a hybrid, which has benefits on packing.It was a great canopy for starting and I never had any reason to complain. Unlike the Sabre 2, no one talks that much about theSilhouette, those who own one love them, they just don't spread the word on it.Pricewise the Sabre only costs $135USD more than the Silhouette.Ask yourself, what you want, the Sabre 2 is the ultimate gateway canopy and as you progress you can stick to the canopy. I reached the point where I could safely switch to a different model and give my Silhouette to my Girlfriend, knowing that she loves the canopy and now she has a canopy that may forgive a few handling errors without turning the situation critical.

  2. Ericakeeley

    The only thing I could do with front risers on the navigator was a pull up.

    This is one of the topics you learn in a canopy course:

    Go slowly into full break, then in the moment when you stop hearing the wind, quickly grab your front riser loops and pull them down.

    You will change the angle of attack by pulling them down and increase your forward speed, however this means also that your decentrate is also increasing ( the trim is steeper in this moment)

    Any experienced canopy pilot can correct me on this.

  3. Iago

    ***Hi all, I'm an A licensed newbie here. I am about 125lbs without gear, I did my student jumps on navigator 200 but purchased a 170 s-fire. Basically I'm looking for advice to safely downsize. I used a demo 190 (low pack volume so I could use my own container) but wasn't able to do many jumps.
    So I guess I'm asking would it be too risky to just jump my 170 when next season starts or should I be looking for a 190 to jump in between?
    My landings have not been consistently good, accuracy is OK but I've done my share of PLF landings.

    Well, one additional thing to consider is moving from a student Navigator to a semi-elliptical. The wingloading increase is a but more 'meh' since you're pretty light, but if you can find a semi in the larger size get a few jumps on that before going to your rig.
    Big concern would be if you have to do a maneuver and you're used to the clunky Navigator. Jumping down and going to a semi could make putting it in Grandma's backyard a bit tougher.

    169 is not out of the ballpark. You probably settle into a 135 or a 120 at your exit weight of 140-150 but that's a few seasons down the road.

    The planform of a canopy is not the only factor to consider,when it comes down to performance...since the Navigator is already a semi elliptical... just a buzzword that makes things more complicated for no reason

  4. degeneration

    What's the worst that could happen?! As you've already got the container, even if everyone is like "jump a 190!!", are you going to? I mean, you've got the container for the 170, you've got the 170... you'll be careful, right?

    [Insert thoughtful pause to consider what degeneration really meant]


  5. I did my licence with a Solo 230 Sqft and started the next season with my Silhouette 170 Sqft. Weightwise, I am a little bit heavier than you, however this not what matters right now. A general advice I can give you is to speak to the instructors from your DZ, as they can give you a better advice than a random dude on the internet. They know you and can help you with finding a good starter canopy. The general rule of downsizing is, that once you can handle landings at no wind, cross wind and land near a previous set point within 10 meters, you are good to go. From what I can tell, having PLFs on mass may indicate that downsizing is not a good idea as of right now. See if you can participate in a canopy control course. After my AFF-Instructor died in a landing accident, it helped me to get rid of the fear on making a mistake while landing. It is a valuable lesson to help you understand yourself and your canopy a bit better.

    Keep in mind, you spend most time under canopy and not in freefall.

  6. I wonder if it helps to use military style goggles...

    I have set my sights on the Oakley M-Frame Alpha Halo goggles. However I am not sure if they will fog up and be suitable for skydiving. Anyone here that has made experience with them?

  7. Phillbo

    Closing Pin..

    Just curious , why do you own a 3D printer? sounds expensive.. Is it for your business?

    Ah yes the closing pin, great idea! :)

    I bought one from my bonus before I started skydiving. I mainly use it for prototyping, hobbywise. Upgraded it multiple times to increase quality and efficiency, mainly use it to print ABS plastic. The last thing I made was a wristmount for my altitrack since I like having my hands free.

    I also love the 4way RW gingerbread men :)

    Let’s see how the Pilatus Porter turns out haha

  8. So I own a 3D Printer and my girlfriend and I are thinking about making cookies for our dropzones christmas party.

    I want to use a skydiving theme and we are currently brainstorming for ideas.

    I thought about making one with my dz‘s logo and as a future vector owner a upt related cutter.

    However, I don‘t want to make cookies in the shape of company logos, no need for advertisement.

    Do you guys have some ideas for nice skydive related cookies? B|

  9. TommyBotten

    Our DZ has used the Ares 2 since March for student and rental purposes. We have not had any students, instructors or funjumpers report any issues with them. The Ares 2 is a civilian version of their military spec altimeter and as such, I would be surprised if L&B have not fixed the issues they used to have with the 2nd. gen Viso2.

    Also note that there is another post on the Ares 2 that has some more information.

    Hello, thank you for the fast response. Are you refering to the post that compared the viso 2(+) with the Ares 2?

  10. Hello There,

    I just visited a rigger and had a short conversation about the Ares 2. The rigger recommended that I stay away from it as it is unreliable abd tends to freeze midjump...

    Can anyone give me some first hand feedback, maybe your own experience if you used / currently use the Ares 2 yourself?

  11. L&B recommends using Paralog in order to evaluate the logged data. They used to have their own software called Jumptrack, however they stopped the development.

    My point is, I would rather figure this out instead of buying an already available solution. The graphical display is a nice feature, but what counts for me is how this is calculated :)

    By looking at my graph from my first post I can see why the ProTrack 2 says that I deployed at 840m. This is where the graph is drastically changing, which makes sense as this is not an immediate stop but rather a fast deacceleration

  12. Hello there,

    I have been waiting patiently for the last 3 days waiting to finally write this post.. I guess had some terrible experience with spammers, however I used this time to go through the question I am about to write.

    I think I should start with a few details upfront.

    I am a 'new' Skydiver, I received my licence at the end of 2016 and finally broke the 100 jumps in august 2017.

    I bought myself a L&B Protrack 2 as a ditter of my choice for freefly as it is a requirement here in Germany to start training, according to the national skydivers manual, since body positions will make it hard to constantly look at my altimeter, however I still peek a few times on it just to make sure I have my proper height awareness.

    The skydiving season ended with the last weekend in october and with 291 jumps completed so far, I thought it was a great time to take a look at my logs, stored on my ProTrack 2.

    I hooked it up to my computer via USB cable and looked what was on the device. Here is a little shout out to L&B for making this quite reasonable since every jump is stored in a seperate .txt file. Brilliant move :)

    There is also a Help.txt file that explains the stored data within a .txt file.

    So this is what happens:

    The ProTrack 2 measures the air pressure on the ground and sets the measured value as 0m. Once I exit the aircraft the device starts recording the pressure values up to 3600 points, which equals 15 minutes, this means it saves 4 samples per second during freefall.

    ( 15 min= 60s * 15 = 900 | 3600 / 900 = 4 )

    According to the Help file, all pressure values are saved as Deca-Pascal (dPa, which could be a typo, since dPa is Deci-Pascal while Deca-Pascal is shortend as daPa. There are several typos, but this one is a crucial one, however I am not judging, I probably made a few typos in this post :P )

    So instead of having 1013.25 hPa I have 10132.5 d(a)Pa, one digit moved to the left.

    The ProTrack also records the temperature on ground level in °Celsius, in my example it is 268 (???), which is also odd, I believe it means 26.8°C which is more likely.

    For my specific jump, I have 864 pressure samples going up from 6166 d(a)Pa to 10064 d(a)Pa, which was my groundlevel, 0 metre.
    864 samples equal 3,6 mi (216s), from which the first 55 seconds where freefall. Within my logged data there is also my exit altitude, 3910m and the deployment altitude of 840m, I will come back to those values later.

    Out of curiousity I punched the 864 samples in an excel file to figure out my graph. It was quite easy and the visualisation made sense.

    However, the next step for me was to understand and convert the pressure into height information. For this I used the barometric formula.

    On the german Wikipedia page I found it already solving for height and so I put in the numbers ( see the attached image "formula.png")
    I changed up the temperature in the picture from 288.15 K to 299.95K (26.8°C) , ph to the measured 864 samples and 1013.25hPa to 10064 d(a)Pa.

    0,0065K/m is the temperature gradient to up to 11km , so for every meter the temperature cools down 0,0065 K. 5.255 seems like a magic number, but in the wikipedia article it is explained that for the stated temperature gradient the exponent Mg/Ra usually converts to this number.

    And this is where my actual question begins:

    I let excel convert my pressure values into height data which works well ( see attached image "height_graph.png).

    However, it says that my jump started at the height of 4107m which is almost off by 200m while my ProTrack 2 says I jumped out at 3910m. I tried to compensate this by adding a -200 in my formula in excel, however this does not check out.

    Why is it like this? It certainly has nothing to do with TAS (True Air Speed) or SAS (Skydiver Air Speed) as those are meant for interpretation of the relative speed.

    Iam sitting here, scratching my head, trying to come up with a logical answer to my question, maybe one of you has an explanation for this.
    Digital pressure sensors are far too precise in comparision to the aneroid barometers.

    Thanks for reading so far, this has turned into a rather long post :)

    Blue Skies!