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The topic to inspire your creative juices this month is BOXES

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Gliding

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  • #16
    Re: Gliding

    Thanks for sharing the pics Walti... the parch marks are fun

    I've been looking at some of the ones that the pro's have been doing https://rcahmw.gov.uk/cropmarks-2018/ and yours look almost as good (reflections excepted)

    regards
    Andy
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    • #17
      Mark Johnson

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      • #18
        Re: Gliding

        Originally posted by MJ224 View Post
        Gordon Bennett, that is looong flight. Mind he ran out of country, might have gone a lot further...……….
        In the gliding world, most flights are closed circuits (arrive back where you started) and 300km is a pretty standard flight that a half-decent pilot will do on a nice summer's afternoon if the conditions are right. But, most modern gliders will have a best glide angle of about 1:40 or better and even at speed (say 80-90kts) are still managing 1:25. Along with a min sink value of around 1-2kts, you can cover a lot of ground quickly with this sort of performance. A good 300km flight should average at least 100kph, and ideally faster.

        500km is a step up in the challenge list of distance flights and doing it constitutes one of the three "diamonds" that glider pilots strive for. In a typical British summer there are usually only a handful of days that are good enough for most pilots, but I'm guessing this year that's been easily beaten.

        After that, the 750km diploma is the next step up and I know a few people this year who have achieved it after years of trying. It's pretty tough since even at 100kph it'll take 7.5 hours and it's unusual to get days that long in terms of thermal activity.

        Finally, there are a few flights of 1000km that have been done in the UK. The first was back in 1995 by a guy called Chris Rollins (a professional gambler and a bit of a rogue, but likeable nonetheless). He flew it (with another pilot) in a very high performance two-seater glider called an ASH 25. It's quite a beast with a 25m wingspan and a best glide of around 1:60. Since then there have been many more. Many of them have been done in wave conditions, rather than thermals, often in Scotland.

        The performance of a para glider however is much worse - about 1:10 best glide for the most modern designs and the speed range they have is much more limited - more like 20 kts rather than 80kts. So, doing 300km in a paraglider is MUCH harder!
        Paul
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        • #19
          Re: Gliding

          Yes, they are starting to run out of thermic day length, and will have to start or finish in the West Country, or more North / South to stretch beyond 300km. The appeal of straight distance flights has lasted I guess because paragliders are easy to get home, whereas landing out in a hang glider or a glider is a chore.

          Triangles have previously been difficult on paragliders with their relatively slow speed, but the top two liners are now much more efficient at higher glide speeds, and probably have a glide of 1:12 now. This allows into wind legs in lightish winds. Some of the best guys have a tow launch club near Cheltenham, and are able to fly on light wind days when launching off low British hills is very hit and miss. Unless you can dive straight into a thermal, sweaty walks up the hill are involved. Hugh Miller broke the declared triangle record from the tow launch on Wednesday with a 125km triangle taking 7 hours! It was bloody hard work. The regular guys there got most of the way, but got decked on the last leg. Here's Hugh's flight: http://www.xcleague.com/xc/flights/2...ml?vx=01200725
          Bruce

          http://flickr.com/photos/bruce-clarke/

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          • #20
            Re: Gliding

            It sounds like para gliding is where gliding was in the early 1950s. Then, downwind one way flights into the West country were common and a 300km closed circuit task was the stuff of dreams. Now, a hundred or more pilots will do 300km flights on any decent day. I think the current recor in the UK for a 300k triangle is a speed of about 130kph. Back in the day when I was competing, I figured out that one particular day I went faster around 400km than if I'd been towed around the task by the tug! With glider performance as it is, you can sometimes do a hundred km or more without even stopping to circle - you just follow the "energy lines" (streets of lift caused by thermals aligning with the wind direction).

            All this talk of gliding is making me pine for it!

            Here's there UK gliding ladder btw:

            https://www.bgaladder.co.uk/Enquiry.asp
            Paul
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            • #21
              Re: Gliding

              Very interesting, and it's nice to have those shots, Paul (Walti).

              All this is now making me nostalgic for the couple of short passenger flights I had in the late 1960s from RAF Cosford with the school 'corps'...
              Regards,
              Mark

              ------------------------------
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              • #22
                Re: Gliding

                Well, I hope you're all happy with yourselves...

                Piqued by this thread of Walti's, this last weekend I visited two clubs and took my first flight in a glider in 7 years. I'm seriously thinking of taking it up again!
                Paul
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                • #23
                  Re: Gliding

                  If these parched summers become the norm, I may have to get back to gliding too Paul! Trying to thermal to a safe height from low British hills with vicious gusts and dust devils around is getting hazardous on a paraglider. Have fun!
                  Bruce

                  http://flickr.com/photos/bruce-clarke/

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                  • #24
                    Re: Gliding

                    Originally posted by pdk42 View Post
                    Well, I hope you're all happy with yourselves...

                    Piqued by this thread of Walti's, this last weekend I visited two clubs and took my first flight in a glider in 7 years. I'm seriously thinking of taking it up again!
                    My job is done here!

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                    • #25
                      Re: Gliding

                      I want one of these!!

                      [ame="https://www.youtube.com/watch?v=sPx-Xkn9OiM"]HpH 304 SJ Shark - Jet Engine Ground Run - YouTube[/ame]
                      Paul
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                      • #26
                        Re: Gliding

                        There's nothing like using the natural elements to stay up Paul! I hope it comes with a spare tail assembly
                        Bruce

                        http://flickr.com/photos/bruce-clarke/

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                        • #27
                          Re: Gliding

                          Did not seem to push it much??
                          Mark Johnson

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                          • #28
                            Re: Gliding

                            Originally posted by pdk42 View Post
                            I want one of these!!
                            There was something similar at the airfield - it was a fold out propeller engine as an emergency get you home jobbie... it folded out of the side of the fuselage.

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                            • #29
                              Mark Johnson

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                              • #30
                                Re: Gliding

                                Or just ditch the glider entirely...9min flight time might be a bit limiting but I suspect I don't have that much upper body strength anyway.


                                [ame="https://www.youtube.com/watch?v=dUVr8ZOKdSc"]Real Life Iron Man Jet Suit - YouTube[/ame]
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