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#31
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Basic Training Gliders, K21 tail ballast.
Buy a PW-6U and eliminate ballast needs :))
W.J. (Bill) Dean (U.K.). wrote: There are two approved methods of adding rear ballast to the K21 to move the C. of G. aft. It is possible to fit a lead ballast block in the rear fuselage just aft of the fin spar, this is not intended to be fitted or removed between flights, and of course the machine must be re-weighed.. It is also possible to have a hole through the fin to take a bar to carry external ballast in the form of up to 10 x 1kg lead weights, which is intended to be adjusted or removed between flights as required. See "optional extras" on the specification sheet at http://www.as-segelflugzeuge.de/englisch/e_main.htm , "Your Sailplane", "ASK 21", at the bottom of the page "Download Info:", "Specification ASK 21 (english)". Both schemes are described in the owners' handbook. See also the Schleicher AD and Technical notes http://www.as-segelflugzeuge.de/englisch/e_main.htm "TN/LTA", "ASK 21" in particular TN-No 4 &4a, see also "further TN/AD see overview (PDF)". Note also that in common with all German gliders (as far as I know) the minimum front cockpit weight is always shown as 70 kg (154 lbs). However if the glider is carefully weighed it may be found that the minimum front cockpit load calculated by moments when flown solo is less than this. Of course the minimum front cockpit load calculated by moments will always be reduced when there is a rear seat pilot, by an amount which increases as the rear cockpit load is increased. The importance of all this is that the glider will not hold a stable spin unless the C. of G. is close to the aft limit (the numbers are in the handbook), but you will be in trouble if you fly it with the C. of G. aft of the aft limit. Don't even think of trying for a full spin, or flying with the C. of G. well aft unless you have read the pilots' manual AMENDED BY TN 23. The TN itself is on the Schleicher web-site but the page amendments are not. W.J. (Bill) Dean (U.K.). Remove "ic" to reply. "Markus Gayda" wrote in message ... For the ASK-21 is a "spin-weight" available which can be installed on the rudder. Of course you have to weigh the pilots before deciding which weights to add to the glider. But then you have a very nice trainer with which you can also train spins. CU Markus |
#32
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Whiplash (was Basic Training Gliders)
'Whiplash' cervical injuries come from a rear impact
where the head lags the forward accelerated body and then whips forward injuring the ligaments and/or muscles at the back of the neck (and causing a movement towards the lawyer's office). The head restraint in a road car limits the rearward head motion, absorbs some energy and thus reduces the forward whiplash. A frontal impact, or a groundloop in a glider might cause a neck injury but the headrest behind the pilot won't help much. That's why they need to have those driver attached anti-forward-movement head restraints for F1 racing drivers. At 09:18 05 December 2005, Nils Hoeimyr wrote: Don Johnstone wrote: I suppose if an impact in a glider is severe enough to cause the whiplash then that injury may be the least of your problems as you are much closer to the crash in a glider that you are in a car. There is less of a crumple zone than in a car, but most well designed gliders will absorb some energy in the nose and cockpit area during impact that will protect you to a certain extent. Whiplash injury is therefore indeed an issue. Even a groundloop during an outlanding can give a whiplash and a good headrest is an important safety feature. Nils |
#33
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Basic Training Gliders, K21 tail ballast.
This completely misses the point.
If you have a K21, I was explaining how you can make it spinnable when flown at normal loads. If you want a two seater which will do a good spin demonstration without ballast then there are several machines which are suitable; the most obvious is the Puchacz which is why the British Gliding Association own one specifically for instructor coaching. W.J. (Bill) Dean (U.K.). Remove "ic" to reply. "Charles Yeates" wrote in message ... Buy a PW-6U and eliminate ballast needs :)) |
#34
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Basic Training Gliders - DG1000 Seat
At 02:00 05 December 2005, Paul wrote:
Derek Try adjusting the sitting position to suit you before you fly in the thing. Most instructors tend to hop and fly without getting things right. The number of times I have people whinging about the **** poor this and the crap that and I find that they havn't even noticed something is adjustable to alleviate that issue. The rear seat of the 1000 is adjustable up and down. I am 6'4 and have no trouble sitting too low in the back of our 1000 if I don't raise the seat. In fact the first time I flew it from the rear I assumed I would need the seat bottomed out. Big mistake! I couldn't see and could only just reach the rudder pedals. I felt like I was in a pit. Next flight adjusted the seat till my head just cleared the canopy and things where totally different. Far better vis ------------------------------------- The original adjustable rear seat, which was a hinged device held up by a seat belt strap with an adjustable buckle, has been removed from our DG1000 and replaced with a High Density Foam safety cushion, as the CFI and the Committee felt it was poorly engineered and dangerous. Indeed the strap adjuster broke during the brief period we had a demonstrator on trial for evaluation, even without any heavy landings. So I am afraid the option that Paul suggests is not open to me. By the way getting permission to do this simple modification cost the club a small fortune, because we had to get it approved and certified by EASA! F***ing Bureaucrats and F***ing European Commission again! I am 5' 10' tall with a fairly long back, but short legs, so I am quite tall sitting down. I regularly instruct in the K13, K21, Duo Discus, Grob G103, Bocian, and now the DG1000. The best forward view from the rear cockpit is offered by the K13 and the Duo Discus which both have one piece canopies, and the Bocian which has a large front canopy and flies in a rather nose down attitude. The K21, Grob 103 and DG1000 all have two piece canopies with a hoop in between them which somewhat restricts the forward view, especially in the case of the DG which seems to have a narrower cockpit and the hoop further forward. It is definitely the worst of the bunch in this respect! I will try a few extra cushions under my backside next time I fly it, as sitting higher probably would improve my view forward. Can I add a one-piece canopy to my wish list? Derek Copeland |
#35
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Basic Training Gliders
"Derek Copeland" wrote in message ... The advanced training requirement is very well covered by such gliders as the Duo Discus, DG500/1000, ASH 25, but there doesn't seem to a modern equivalent of the K13 for basic training! Unless anybody knows of one that is? Could I suggest the following specification: 1) Safe and easy to fly 2) Simple fixed gear undercarriage 3) Easy ground handling (our club is now buying retractable gear DG1000s, but they are a complete pain on the ground) 4) Fully aerobatic, including good spinning characteristics 5) Must be capable of flying all the exercises in the training syllabus 6) Enough performance to make reasonable cross-country flights, but not so much as to make it difficult to get students down. 7) Small enough for easy hangarage - wingspan not more than 17 or 18 metres. I would also add that the perfect trainer has an airframe that you can leave out in the weather 24/7 (or at least all day). Trainers usually are tied down near the launch point so they are ready to go at a moment's notice. Often there is not a handy hanger, and rigging,derigging several times a day is simply out of the question. Present-day machines that I would consider leaving out in the weather include the Blanik, Krosno, and (naturally) the 2-33. The trainer itself is also part of your promotial plan to attract new students, so it should preferably at least look like a modern glider. That leaves out the 2-33. Vaughn |
#36
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Basic Training Gliders - DG1000 Rear Seat
I have now tried flying from the rear seat of the DG1000
with some extra safety cushions under me. Sitting higher does indeed improve the view forward quite markedly, especially as I can now see over the top of the front seat headrest. Derek Copeland ---------------- At 02:00 05 December 2005, Paul wrote: Derek Try adjusting the sitting position to suit you before you fly in the thing. Most instructors tend to hop and fly without getting things right. The number of times I have people whinging about the **** poor this and the crap that and I find that they havn't even noticed something is adjustable to alleviate that issue. The rear seat of the 1000 is adjustable up and down. I am 6'4 and have no trouble sitting too low in the back of our 1000 if I don't raise the seat. In fact the first time I flew it from the rear I assumed I would need the seat bottomed out. Big mistake! I couldn't see and could only just reach the rudder pedals. I felt like I was in a pit. Next flight adjusted the seat till my head just cleared the canopy and things where totally different. Far better vis ------------------------------------- The original adjustable rear seat, which was a hinged device held up by a seat belt strap with an adjustable buckle, has been removed from our DG1000 and replaced with a High Density Foam safety cushion, as the CFI and the Committee felt it was poorly engineered and dangerous. Indeed the strap adjuster broke during the brief period we had a demonstrator on trial for evaluation, even without any heavy landings. So I am afraid the option that Paul suggests is not open to me. By the way getting permission to do this simple modification cost the club a small fortune, because we had to get it approved and certified by EASA! F***ing Bureaucrats and F***ing European Commission again! I am 5' 10' tall with a fairly long back, but short legs, so I am quite tall sitting down. I regularly instruct in the K13, K21, Duo Discus, Grob G103, Bocian, and now the DG1000. The best forward view from the rear cockpit is offered by the K13 and the Duo Discus which both have one piece canopies, and the Bocian which has a large front canopy and flies in a rather nose down attitude. The K21, Grob 103 and DG1000 all have two piece canopies with a hoop in between them which somewhat restricts the forward view, especially in the case of the DG which seems to have a narrower cockpit and the hoop further forward. It is definitely the worst of the bunch in this respect! I will try a few extra cushions under my backside next time I fly it, as sitting higher probably would improve my view forward. Can I add a one-piece canopy to my wish list? Derek Copeland |
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