outrager 6 #1 July 22, 2009 Yo ! All this talk about downwind 3.5 glide flights reminded me about a very nice real-life L/D challenge that's still to be conquered: Try flying from the Mushroom (Eiger) all the way down to Grindenwald. It's a scenic and intense flight over the rolling hills. You will need to cover about 5000m distance to use all 2200m of available altitude, requiring a measly 2.6-2.7 L/D average depending on how much altitude you allow for a start and deployment. Exit altitude is 3200m, which puts it rather close to a skydive. Wind will not be a significant factor: you have to pick a quiet day to survive. Access is easy, start is safe, and LZs are bigger than most DZs Plenty of attempts have been done from this exit over the years, and AFAIK the challenge remains. It should be so easy now with the new suits, eh? C'mon, do it, even at 2.9 you'll be a rock star! Quote Share this post Link to post Share on other sites
mccordia 74 #2 July 22, 2009 Sounds like a great challenge.. Whats the furthest distance flown so far on this jump? And are there any videos online on previous attempts?JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
outrager 6 #3 July 22, 2009 Quote Sounds like a great challenge.. Whats the furthest distance flown so far on this jump? Not really sure. I made it to the last hill back in 2003 (4300m mark, 2050m altitude) on S3 prototype, and again to the same exact point on V2 a couple of years ago. Endurance seems to be the key to make it over the last hill when you are low and tired. I recon if you make it over this point you make it all the way. It's hard to judge exact altitude at such a shallow angle, and you must beware of a weak pull - i almost got burned on the first attempt by using up all of the arms energy and barely extracting PC out of the pouch Quote Share this post Link to post Share on other sites
mccordia 74 #4 July 22, 2009 Are you flying a V3 already? Any attempts planned in the (your) near or far future?JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
yuri_base 1 #5 July 22, 2009 At 3.52 actual and a mere 2.62 required, this must be piece of cake for Tony.Android+Wear/iOS/Windows apps: L/D Vario, Smart Altimeter, Rockdrop Pro, Wingsuit FAP iOS only: L/D Magic Windows only: WS Studio Quote Share this post Link to post Share on other sites
outrager 6 #6 July 22, 2009 Quote Are you flying a V3 already? Any attempts planned in the (your) near or far future? Nope, and probably not this season. I took a year-long break from flying, and now got stuck in Scotland for a while. Maybe back in the fall, but won't be current and high-alt season will end by then. Otherwise i'd quietly go and rape it instead of posting here Quote Share this post Link to post Share on other sites
Zeemax 0 #7 July 22, 2009 Depending on where in Scotland, you're only 3 1/2 hours on a train up down the country. We should have a beer Phoenix Fly - High performance wingsuits for skydiving and BASE Performance Designs - Simply brilliant canopies Quote Share this post Link to post Share on other sites
Waldschrat 0 #8 July 22, 2009 Quote Yo ! All this talk about downwind 3.5 glide flights reminded me about a very nice real-life L/D challenge that's still to be conquered: ....so it's only a real life challenge, if you putting you life in danger in no wind? How real is your life today? Quote Share this post Link to post Share on other sites
mccordia 74 #9 July 22, 2009 Quote Depending on where in Scotland, you're only 3 1/2 hours on a train up down the country. We should have a beer Or make some performance flight flocks at the UKS boogie next monthBut that aside...a drink at UKS (or anywhere in the UK when Im also around next month) would be awesome cool..JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
outrager 6 #10 July 22, 2009 Quote At 3.52 actual and a mere 2.62 required, this must be piece of cake for Tony. The graph is suicidal: the red point at 5k mark is impact You need to allow for deployment, say at 100m AGL. Also, suits start to fly waaaay sooner. It may be hard to scientifically plot the first few seconds, however multiple experiments show S3/V1 style suits at about 300m horizontal mark 300m below the exit point (as measured by deployment and landing/water impacts from 370m range objects Quote Share this post Link to post Share on other sites
mccordia 74 #11 July 22, 2009 Quote (as measured by deployment and landing/water impacts from 370m range objects Is that video still online somewhere....I recall seeing that one a long time ago. I think thats still the longest/furthest B flight in a wingsuit up to this date if Im not wrong??JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
outrager 6 #12 July 22, 2009 Quote ....so it's only a real life challenge, if you putting you life in danger in no wind? You've mixed it up: your life's in danger in strong wind Let's not hijack a thread quite yet Quote Share this post Link to post Share on other sites
outrager 6 #13 July 22, 2009 QuoteQuoteIs that video still online somewhere....I recall seeing that one a long time ago. I think thats still the longest/furthest B flight in a wingsuit up to this date if Im not wrong?? Ostankino '04: http://base416.com/ostankino04/Pond_Flight.mov This year's Burj Dubai WS flight is roughly twice as high, though. Quote Share this post Link to post Share on other sites mccordia 74 #14 July 22, 2009 Quote....so it's only a real life challenge, if you putting you life in danger in no wind? Yuri means that flying a constant glide on all your jumps, and getting the wind on top of that as a variable, is better than betting your life on the variable to begin with...JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites jakee 1,489 #15 July 22, 2009 QuoteQuote....so it's only a real life challenge, if you putting you life in danger in no wind? Yuri means that flying a constant glide on all your jumps, and getting the wind on top of that as a variable, is better than betting your life on the variable to begin with... I thought he meant that if there's any significant wind then the mountain weather will kill you...Do you want to have an ideagasm? Quote Share this post Link to post Share on other sites Tony-tonysuits 0 #16 July 22, 2009 ok, I'll do it, ive never done a wingsuit base and I dont like pulling low but....hmmm maybe we can get Toby to do it, you reading this Toby, he doesnt like to pull low either, 300 m. Heres a question, does the G/R improve with lower thicker air? it sure feels like it. I know in a plane you gotta go higher to go faster, so, is that the same with a wingsuit?Life is a series of wonderful opportunities, brilliantly disguised as impossible situations. tonysuits.com Quote Share this post Link to post Share on other sites mfnren 2 #17 July 22, 2009 you won't be going any lower than 3,300 msl, hopefully... Quote Share this post Link to post Share on other sites outrager 6 #18 July 23, 2009 Quote ok, I'll do it, ive never done a wingsuit base and I dont like pulling low but....hmmm maybe we can get Toby to do it, you reading this Toby, he doesnt like to pull low either, 300 m. Somebody has to! You should be able to pull at 300m over the village at L/D of 2.9. If you do fly at 3.5 you will be pulling at 600m. These numbers assume 200m of altitude wasted for a lazy start, obviously that can be done better. Quote Heres a question, does the G/R improve with lower thicker air? it sure feels like it. It does not. True airspeed (i.e. both vertical and horizontal, proportionally) does increase with altitude, so starting a suit higher up will take slightly longer. Sustained L/D will be the same at any altitude, assuming that you are indeed flying. Google, like http://www.stolaf.edu/people/hansonr/soaring/spd2fly/densalt.htm if you want to know why in detail. Quote Share this post Link to post Share on other sites mccordia 74 #19 July 23, 2009 Quote Heres a question, does the G/R improve with lower thicker air? it sure feels like it. I know in a plane you gotta go higher to go faster, so, is that the same with a wingsuit? Yes...thats the same...higher you go faster, lower you go slower. Glide-ratio is the only constant in that equation....so that one doesnt improve when you go lower (or decrease when you go higher). Only the speed at which you travel changes.JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites yuri_base 1 #20 July 23, 2009 Actually, sustained glide ratio is slightly higher than L/D, because as you're flying into continuously denser air, you're constantly moving at slightly higher speed than true sustained speed for current layer, so effectively, you're constantly plane out. The effect is tiny, about 1%: if you enter, for example, Vxs=100mph, Vys=40mph (L/D=2.5) in Wingsuit Equations module in Wingsuit Studio, you will see that sustained glide ratio is about 2.53. That's nothing compared to secret method of bumping G.R. by 40% discovered by Tony in Marl. Android+Wear/iOS/Windows apps: L/D Vario, Smart Altimeter, Rockdrop Pro, Wingsuit FAP iOS only: L/D Magic Windows only: WS Studio Quote Share this post Link to post Share on other sites michalm21 2 #21 July 23, 2009 do you even skydive? edit: no pun, honest question. Quote Share this post Link to post Share on other sites Deniq 0 #22 July 23, 2009 The influence of altitude wind on the glide ratio is huge! The second point is the exit and main deployment procedure... Look on one my GPS-track. Glide Ratio is: In Race Zone 5285/2071=2,55. For whole track: (619+5285+864)/(551+2071+1397)=1,68 If you see "Ground Speed Graph", you can see decreasing of my ground speed from 250+ to 150 kmh. The "Vertical Speed" is here all time more or less constant. If I understood "outrager", for the Eiger challenge you need glide ratio of 2,6 for whole track Quote Share this post Link to post Share on other sites grayhghost 0 #23 October 9, 2009 looks like it got done: http://www.matttg.com/eiger.htm nice work Mattt! Quote Share this post Link to post Share on other sites yuri_base 1 #24 October 10, 2009 Awesome stuff! Dean Potter is most likely the 1st in the world who flew from Mushroom to Grindelwald [several times in his Xcess]. From jumping with him and watching his flights, he has a very good glide at quite slow sustained speeds, both vertical and horizontal. Low wingloading allows for quick start (which doesn't require high L/D per se; max lift mode with about 45 degree angle of attack, despite having L/D of about 1.0, pulls you from the wall the fastest; then switch to higher L/D "gear" by controlling your pitch and ensuring lower AoA). Sometimes he wouldn't be able to repeat it and I mentioned to him that it might be the headwind affecting his glide. With 2m 50s flights from the higher exit, a 20mph tailwind gives a free mile of distance, while the same headwind takes it from you. For such long flights, wind can be used creatively to do flights that would otherwise be impossible to do. As can be seen from Wingsuit Studio simulations, longer (slower) flights allow lower L/D threshold to achieve the same goal compared to faster flights. In this example, compare two flights from the Mushroom, one is 120s long and the other 150s long. And that's without the tailwind - with tailwind the effect is even more drastic! I'm sure we'll see lots of other amazing things done by Dean in the near future! YuriAndroid+Wear/iOS/Windows apps: L/D Vario, Smart Altimeter, Rockdrop Pro, Wingsuit FAP iOS only: L/D Magic Windows only: WS Studio Quote Share this post Link to post Share on other sites mariavon 0 #25 October 15, 2009 Yuri, if one flew at a glide ratio of 4.5:1 , what more or less would you guess the vertical speed to be, and what would the ground speed be, and distance covered ? i guess there are variables but in very average conditions? (pronounced G - jii is the force that makes you fly!) Jii-Wings - no strings! Quote Share this post Link to post Share on other sites Prev 1 2 Next Page 1 of 2 Join the conversation You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible. Reply to this topic... × Pasted as rich text. Paste as plain text instead Only 75 emoji are allowed. × Your link has been automatically embedded. Display as a link instead × Your previous content has been restored. Clear editor × You cannot paste images directly. Upload or insert images from URL. Insert image from URL × Desktop Tablet Phone Submit Reply 0
mccordia 74 #14 July 22, 2009 Quote....so it's only a real life challenge, if you putting you life in danger in no wind? Yuri means that flying a constant glide on all your jumps, and getting the wind on top of that as a variable, is better than betting your life on the variable to begin with...JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
jakee 1,489 #15 July 22, 2009 QuoteQuote....so it's only a real life challenge, if you putting you life in danger in no wind? Yuri means that flying a constant glide on all your jumps, and getting the wind on top of that as a variable, is better than betting your life on the variable to begin with... I thought he meant that if there's any significant wind then the mountain weather will kill you...Do you want to have an ideagasm? Quote Share this post Link to post Share on other sites
Tony-tonysuits 0 #16 July 22, 2009 ok, I'll do it, ive never done a wingsuit base and I dont like pulling low but....hmmm maybe we can get Toby to do it, you reading this Toby, he doesnt like to pull low either, 300 m. Heres a question, does the G/R improve with lower thicker air? it sure feels like it. I know in a plane you gotta go higher to go faster, so, is that the same with a wingsuit?Life is a series of wonderful opportunities, brilliantly disguised as impossible situations. tonysuits.com Quote Share this post Link to post Share on other sites
mfnren 2 #17 July 22, 2009 you won't be going any lower than 3,300 msl, hopefully... Quote Share this post Link to post Share on other sites
outrager 6 #18 July 23, 2009 Quote ok, I'll do it, ive never done a wingsuit base and I dont like pulling low but....hmmm maybe we can get Toby to do it, you reading this Toby, he doesnt like to pull low either, 300 m. Somebody has to! You should be able to pull at 300m over the village at L/D of 2.9. If you do fly at 3.5 you will be pulling at 600m. These numbers assume 200m of altitude wasted for a lazy start, obviously that can be done better. Quote Heres a question, does the G/R improve with lower thicker air? it sure feels like it. It does not. True airspeed (i.e. both vertical and horizontal, proportionally) does increase with altitude, so starting a suit higher up will take slightly longer. Sustained L/D will be the same at any altitude, assuming that you are indeed flying. Google, like http://www.stolaf.edu/people/hansonr/soaring/spd2fly/densalt.htm if you want to know why in detail. Quote Share this post Link to post Share on other sites
mccordia 74 #19 July 23, 2009 Quote Heres a question, does the G/R improve with lower thicker air? it sure feels like it. I know in a plane you gotta go higher to go faster, so, is that the same with a wingsuit? Yes...thats the same...higher you go faster, lower you go slower. Glide-ratio is the only constant in that equation....so that one doesnt improve when you go lower (or decrease when you go higher). Only the speed at which you travel changes.JC FlyLikeBrick I'm an Athlete? Quote Share this post Link to post Share on other sites
yuri_base 1 #20 July 23, 2009 Actually, sustained glide ratio is slightly higher than L/D, because as you're flying into continuously denser air, you're constantly moving at slightly higher speed than true sustained speed for current layer, so effectively, you're constantly plane out. The effect is tiny, about 1%: if you enter, for example, Vxs=100mph, Vys=40mph (L/D=2.5) in Wingsuit Equations module in Wingsuit Studio, you will see that sustained glide ratio is about 2.53. That's nothing compared to secret method of bumping G.R. by 40% discovered by Tony in Marl. Android+Wear/iOS/Windows apps: L/D Vario, Smart Altimeter, Rockdrop Pro, Wingsuit FAP iOS only: L/D Magic Windows only: WS Studio Quote Share this post Link to post Share on other sites
michalm21 2 #21 July 23, 2009 do you even skydive? edit: no pun, honest question. Quote Share this post Link to post Share on other sites
Deniq 0 #22 July 23, 2009 The influence of altitude wind on the glide ratio is huge! The second point is the exit and main deployment procedure... Look on one my GPS-track. Glide Ratio is: In Race Zone 5285/2071=2,55. For whole track: (619+5285+864)/(551+2071+1397)=1,68 If you see "Ground Speed Graph", you can see decreasing of my ground speed from 250+ to 150 kmh. The "Vertical Speed" is here all time more or less constant. If I understood "outrager", for the Eiger challenge you need glide ratio of 2,6 for whole track Quote Share this post Link to post Share on other sites
grayhghost 0 #23 October 9, 2009 looks like it got done: http://www.matttg.com/eiger.htm nice work Mattt! Quote Share this post Link to post Share on other sites
yuri_base 1 #24 October 10, 2009 Awesome stuff! Dean Potter is most likely the 1st in the world who flew from Mushroom to Grindelwald [several times in his Xcess]. From jumping with him and watching his flights, he has a very good glide at quite slow sustained speeds, both vertical and horizontal. Low wingloading allows for quick start (which doesn't require high L/D per se; max lift mode with about 45 degree angle of attack, despite having L/D of about 1.0, pulls you from the wall the fastest; then switch to higher L/D "gear" by controlling your pitch and ensuring lower AoA). Sometimes he wouldn't be able to repeat it and I mentioned to him that it might be the headwind affecting his glide. With 2m 50s flights from the higher exit, a 20mph tailwind gives a free mile of distance, while the same headwind takes it from you. For such long flights, wind can be used creatively to do flights that would otherwise be impossible to do. As can be seen from Wingsuit Studio simulations, longer (slower) flights allow lower L/D threshold to achieve the same goal compared to faster flights. In this example, compare two flights from the Mushroom, one is 120s long and the other 150s long. And that's without the tailwind - with tailwind the effect is even more drastic! I'm sure we'll see lots of other amazing things done by Dean in the near future! YuriAndroid+Wear/iOS/Windows apps: L/D Vario, Smart Altimeter, Rockdrop Pro, Wingsuit FAP iOS only: L/D Magic Windows only: WS Studio Quote Share this post Link to post Share on other sites
mariavon 0 #25 October 15, 2009 Yuri, if one flew at a glide ratio of 4.5:1 , what more or less would you guess the vertical speed to be, and what would the ground speed be, and distance covered ? i guess there are variables but in very average conditions? (pronounced G - jii is the force that makes you fly!) Jii-Wings - no strings! Quote Share this post Link to post Share on other sites
