JS-MD 1C Aircraft Flight Manual
MD01-AFM-00-001
Issue: 02
Rev. 00
Rev. Date: 14.09.2017
Page 7-18
7.11 Water ballast system
General
The water ballast system allows the weight of the sailplane to be
increased to a maximum of 600 kg (1323 lbs) in the 18 m configuration
and to 720 kg (1587 lbs) in the 21 m configuration. The water tanks are
integral type to the wings. Each inboard wing tank holds approximately
90 litres of water. Each 21 m wingtip holds approximately 17 litres of
water.
There are two tail tanks to enable to pilot set the optimum CG position
for a flight:
•
The expendable ballast tail tank is positioned in the bottom area
of the vertical fin with a capacity of approximately 7.5 litres
•
The non-expendable ballast tail tank is positioned above the
expendable tail tank in the vertical fin and has a capacity of
approximately 4.5 litres. This tank is used to optimize the un-
ballasted CG position.
The water in the non-expendable ballast tank can be drained after flight
by removing the tape over the holes on the right-hand side of the fin.
A non-expendable ballast fuselage tank is accessible via the engine bay
doors. This tank can be installed optionally if an engine is not installed.
The dump valve control is situated on the right-hand side of the cockpit.
Pushing the lever forward opens both the wing tank valves and the
expendable tail tank valve.
Figure 7.10.1- 1
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