Jonker Sailplanes JS-3 Rapture User Manual

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 6-11
Optimisation of centre of gravity
The CG of the aircraft is shifted towards the aft 25 % of the CG to obtain
optimum overall performance. The procedure to set up the CG optimally
is as follows:
1. Setup the aircraft to include the pilot weight in the empty
configuration on the desired CG position (75% position). This
can be achieved by:
o Add/remove the permanent ballast and perform the
following:
 Redo the mass and balance.
 Recalculate the new minimum and maximum cockpit
loads as explained in the JS-MD 3 Maintenance Manual.
 Update the cockpit loads placard or Placard Booklet
(Figure 2.14-2).
 Update the weight and balance record (Table 6.2-1)
o Add/remove the removable ballast to change the empty (no
water ballast) CG. The removable ballast includes:
 Water in the non-expendable tail tank (top fin tank).
When loading the aircraft with water ballast, the expendable tail tank is
used to offset the forward CG change due to water in the main wing
tanks. Calculate the water quantity required in the expendable tail tank
and load accordingly.
Dumping water ballast in flight has no effect on the CG position when
using this procedure.
NOTE: The removable ballast is used to change the CG
(without water ballast) without affecting the approved
weight and balance record.

Jonker Sailplanes JS-3 Rapture Specifications

General

Brand	Jonker Sailplanes
Model	JS-3 Rapture
Category	Aircrafts
Language	English