Discussion Overview
The discussion centers on whether a modern large airliner, specifically a widebody jet like an Airbus or Boeing, can perform a vertical loop maneuver. Participants explore the theoretical and practical limitations of such an action, considering factors like thrust-to-weight ratio, g-load ratings, and aerodynamic control.
Discussion Character
- Debate/contested
- Technical explanation
- Conceptual clarification
Main Points Raised
- Some participants suggest that while some widebody jets might be capable of a vertical loop, most cannot due to a low thrust-to-weight ratio.
- Others propose that the main limitation is the low g-load design rating and insufficient aerodynamic control authority to execute a tight loop.
- It is noted that the thrust-to-weight ratio of an "empty" A340 is about 0.6, which is better than many WWII fighters, but this does not equate to the maneuverability of those aircraft.
- Concerns are raised regarding the elevators' ability to provide the necessary pitch control for looping, even if the aircraft could handle the g-forces.
- Participants discuss the expected g-loading for a loop, estimating it to be around 3-4g for an inside loop.
- One participant mentions that typical commercial aircraft are certified for -1 to +2.5g steady loading, which is significantly less than what aerobatic aircraft can handle.
- There is a consideration of the loop's radius, suggesting that starting at cruising speed would require a large loop radius, which would decrease as speed drops.
- One participant expresses that it should be possible if the fly-by-wire system allows for it, indicating a belief in the potential for such maneuvers under specific conditions.
- A light-hearted comment suggests a belief that it might be possible, but without serious technical backing.
Areas of Agreement / Disagreement
Participants express differing views on the feasibility of a vertical loop with large airliners, with no consensus reached on whether it is possible or the specific limitations involved.
Contextual Notes
Limitations include the dependence on specific aircraft models, the assumptions regarding fly-by-wire systems, and the unresolved nature of aerodynamic control capabilities in this context.