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Coconut Swallow Velocity Calculator: African or European?

Updated May 3, 2026Reviewed by Calc.Cards Editorial TeamCruising airspeed reduced by lift-loss factor (extra weight cuts speed by ~k × W/W_body, where W is coconut weight and W_body is bird mass). Defaults to European Hirundo rustica at 24 mph and ~20 g body mass.3 sources

Coconut Swallow Velocity Calculator

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Results

Unladen airspeed (mph)24
With coconut (mph)0
Payload : body ratio75.0
Can it fly? (1=yes, 0=no)0
View saved →

Reference

How this is calculated

Methodology

Cruising airspeed reduced by lift-loss factor (extra weight cuts speed by ~k × W/W_body, where W is coconut weight and W_body is bird mass). Defaults to European Hirundo rustica at 24 mph and ~20 g body mass.

Reviewed by

Calc.Cards Editorial Team

Sources

  • 1.Strix journal of ornithology, observed flight speeds of European Barn Swallow Hirundo rustica (~24 mph cruising)
  • 2.BBC Earth: African Swallow flight characteristics
  • 3.Monty Python and the Holy Grail (1975), Bridge of Death scene

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"What Do You Mean? An African or European Swallow?"

In *Monty Python and the Holy Grail* (1975), the Bridgekeeper of the Bridge of Death asks King Arthur a sequence of three questions. The third — "What is the airspeed velocity of an unladen swallow?" — gets the iconic counter-question: "What do you mean? An African or European swallow?" The bridgekeeper, stumped, is hurled into the Gorge of Eternal Peril.

The actual answer involves real ornithology. We added the coconut.

How to Use This Calculator

Swallow species. European Barn Swallow (*Hirundo rustica*) cruises at ~24 mph; the African Swallow (*Hirundo cucullata* or generalized) cruises at ~28 mph in mating-display flight.

Coconut weight. A typical mature coconut weighs about 1.5 kg (3.3 lb). The film's joke is that swallows are 20-gram birds — they cannot meaningfully carry a coconut.

Carry method. "Gripped by the husk" (the film's claim) reduces lift more than "held under wings."

The Formula

Cruising speed × (1 − k × payload_weight / bird_body_weight). For unladen flight, payload is zero and the bird flies at its normal speed. For a 20g bird carrying a 1.5kg coconut, the carry ratio is 75:1 — physically impossible. The calculator returns 0 mph (and a snide note).

Frequently Asked Questions

What is the actual airspeed of an unladen European swallow?

About 11 m/s, or ~24 mph. Source: documented studies of *Hirundo rustica* by ornithologists.

Could a swallow actually carry a coconut?

No. A 20-gram bird cannot lift a 1.5 kg coconut by 75x its body mass. Even golden eagles top out at carrying ~50% of their body weight.

Was this question from real Arthurian legend?

No. It's pure Monty Python. King Arthur did not actually face a Bridgekeeper at the Bridge of Death. (Citation needed.)

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