SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK
Ventus-2c FLIGHT MANUAL
4.5.7 High altitude flight
When flying at high altitude it should be noted that true airspeed (TAS) increases
versus indicated airspeed (IAS). This difference does not affect the structural
integrity or load factors, but to avoid any risk of flutter, the following indicated
values (IAS) must not be exceeded:
Altitude V (IAS) Altitude V (IAS)
m ft km/h kt mph m ft km/h kt mph
0 0 285 154 177
1000 3281 285 154 177 6000 19685 227 122 141
2000 6562 285 154 177 7000 22966 215 115 134
3000 9843 266 143 166 8000 26247 203 109 126
4000 13123 253 136 157 9000 29528 191 102 119
5000 16404 240 129 149 10000 32808 180 97 112
(see limitations placard page 2.15 too)
Flying at temperatures below freezing point
When flying at temperatures below 0° C (32° F), as in wave or during the winter
months, it is possible that the usual ease and smoothness of the control circuits
is reduced. It must therefore be ensured that all control elements are free from
moisture so that there is no danger of them freezing solid. This applies especially
to the airbrakes!
From experience gained to date it has been found beneficial to cover the mating
surfaces of the airbrakes with "Vaseline" along their full length so that they
cannot freeze solid. Furthermore the control surfaces should be moved
frequently.
When flying with water ballast, observe the instructions given in section 4.5.6.
November 2003 LBA-app.
Revision -- 4.5.7.1
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