A tailwheel-type airplane has a greater tendency to weathervane during taxi than a nosewheel-type because on a tailwheel airplane, the

Question

BlackTom AI · Accepted Answer

Weathervaning is dominated by the yawing moment produced by lateral forces on surfaces aft of the main landing gear (the pivot point while taxiing).

1) Relevant knowledge points and concepts
- Weathervaning: tendency of an aircraft to align into the relative wind while on the ground due to aerodynamic side forces acting on surfaces ahead of or behind the pivot point (main gear).
- Yawing moment about the pivot = lateral force × moment arm (distance from pivot to center of pressure).
- The effective tendency depends on the ratio of surface area (and its moment arms) behind the pivot versus ahead of it.

2) Step-by-step reasoning
- Identify pivot: When an airplane pivots on the ground during taxi, the main landing gear act as the rotation/pivot point.
- Identify side-force contributors: vertical stabilizer, fuselage sides, tail surfaces aft of the main gear produce side force that tends to turn the tail into the wind; forward surfaces ahead of the main gear produce opposing moments.
- Compare tailwheel vs nosewheel layout: On a tailwheel airplane the main gear are relatively far forward compared with the tail surfaces; much of the lateral area (vertical tail, tailcone) lies well behind the main gear. That increases the moment arm of aft-side forces about the main gear.

3) Simple illustrative calculation
- Let aft area produce lateral force F proportional to area. Moment_aft = F_aft × d_aft. If F_aft ∝ A_aft, Moment_aft ∝ A_aft × d_aft.
- Example: tailwheel: A_aft = 60, d_aft = 8 → moment ∝ 480. Area forward A_fwd = 10, d_fwd = 2 → moment ∝ 20. Net yawing tendency large.
- Nosewheel: A_aft = 60, d_aft = 5 → moment ∝ 300; A_fwd = 30, d_fwd = 3 → moment ∝ 90. Net tendency smaller.

4) Why the correct answer is correct
- Because the surface area and its effective moment arm located behind the main gear are larger on tailwheel airplanes relative to the forward area, the net yawing moment into the wind is greater, producing more weathervaning.

5) Why other options are incorrect
- "Vertical stabilizer to fuselage proportion is greater." This addresses absolute proportions, not the critical geometry relative to the pivot; a larger stabilizer alone does not explain the difference in tendency.
- "Surface area ratio behind the pivot point (main gear) is less." That is opposite of the true geometric relationship; tailwheel airplanes have a greater aft-to-forward surface area leverage, not less.

6) Conclusion
The correct answer is: surface area ratio behind the pivot point (main gear) is greater. This matches the provided answer.

A tailwheel-type airplane has a greater tendency to weathervane during taxi than a nosewheel-type because on a tailwheel airplane, the单项选择题

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