Jonker Sailplanes JS-MD 3 User Manual

JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 6-7
To determine if a selected load falls within the CG envelope, as illustrated
in Figure 6.3-3, the following procedure can be used:
1. List all the loads in table format as illustrated in Table 6.3-1
2. (Include the mass and CG arm of the empty aircraft as obtained
in the mass and balance report).
3. Calculate the moments for each load, using the formula:
Moment = Mass x Moment arm
4. Add the mass of the applicable loads
5. Add the moments of the applicable loads
6. Plot the mass against the moment on the JS-3 Envelope diagram
(Figure 6.3-3).
7. The Flying CG can also be calculated using the formula
Flying CG position = (Total of Moments) / (Total Mass)
Example:
Determine if the following loads falls within the allowable envelope:
• Empty aircraft: 280 kg, CG position 470 mm
• Pilot with parachute weighs 90 kg
• Both the main tanks and expendable tail tanks filled to capacity.
• The non-expendable tail tank filled with 8.9 litres of water
• An O
2
bottle of 2 kg fitted.
This example is given in metric units only.

Jonker Sailplanes JS-MD 3 Specifications

General

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