Vendetta Final Proposal Part 2 - Cal Poly

Table 9.II - Final Component Weight Buildup
Weight (lb)
Component Roskam Nicolai Raymer Average
Structures
Wing Group 9,687 XXXXXX 7,870 8,779
Horizontal Tail 1,135 1,694 958 1,262
Vertical Tail 801 1,538 1,497 1,279
Fuselage 10,681 XXXXXX 10,398 10,540
Main Landing Gear 2,742 2,969 1,156 2,289
Nose Landing Gear 387 405 408 400
Propulsions 11,098 11,352 11,662 11,675
Systems 18,649 14,506 14,350 20,574
Payload 9,280 9,280 9,280 9,280
Fuel 58,974 58,974 58,974 58,974
TOGW 125,051
Inertias were calculated using guidelines outlined by the Society of Allied Weight Engineers (SAWE). Each
component mass and location in reference to the aircraft center-of-gravity was used to calculate that components inertia.
The sums of these inertias were then used to calculate the total moments
of inertia about the Vendetta’s principal axes shown in Figure 9.1. In
order to determine whether or not these values were accurate, the
moments of inertia were transformed into non-dimensional radii of
gyration coefficients. These coefficients were then compared to typical
values for a jet bomber provided by SAWE. The inertias are shown in
Table 9.IV and the non-dimensional radii of gyration coefficients as
Figure 9.1- Principle Axes
compared to the SAWE predicted coefficients are shown in Table 9.III.
Table 9.III indicates that the inertias are well within the typical values for a jet bomber except about the roll axis.
This is because the Vendetta is similar to a typical jet bomber in length; however, it has a much shorter wingspan. This
would constitute a smaller moment of inertia about the roll axis.
After having developed an initial configuration and a more detailed class II weight buildup, the next step was to
balance the aircraft. This was done for two types of payload, the first being fixed equipment and the second being nonfixed
equipment, fuel, and payload.
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