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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 |
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