JS-MD 1C Aircraft Flight Manual
MD01-AFM-00-001
Issue: 02
Rev. 00
Rev. Date: 14.09.2017
Page 6-9
6.4 Optimisation of centre of gravity
The centre of gravity may be shifted toward the aft 25 % of the CG to
obtain optimum climb performance. The procedure to set up the CG
optimally is as follows:
1. Set up the sailplane with pilot in the empty configuration on the
desired CG position (aft limit). This can be achieved by:
•
Add/remove permanent ballast and performing the following:
o
Redo the mass and balance.
o
Recalculate the new minimum and maximum cockpit
loads as explained in the MD01-AMM-00-001 JS-
MD 1C Aircraft Maintenance Manual.
o
Update the Cockpit loads placard (Fig 2.13.0-3).
o
Update the weight and balance record(Table 6.2.0-1)
•
Add/remove removable ballast to change the empty (no
water ballast) centre of gravity. Removable ballast include:
o
Tail battery.
o
Water in the non-expendable tail tank (top fin tank).
o
Removable nose weights.
2. When loading the sailplanes with water ballast, the expendable tail
tank is used to offset the forward centre of gravity change due to
water in the main wing tanks. Calculate the water quantity required
in the expendable tail tank, and load accordingly.
When using this procedure, dumping water ballast in flight has no effect
on the CG position.
NOTE:
The removable ballast is used to change the centre of gravity
(without water ballast) without affecting the approved weight
and balance record.
