Friday, January 30, 2009

Aspect Ratio GN-1 Aircamper


Let's have a look at the aspect ratio of the GN-1 Aircamper wing.

First a definition... "Aspect ratio is defined as the ratio of the span squared to the wing area, which reduces to the ratio of the span to the chord in the case of a rectangular wing."

The GN-1 Aircamper has a rectangular wing with a span of 29 ' (348") and a cord of 60". Giving a wing area (S) of 29 x 5 = 145 ft^2.

The aspect ratio (A) of the GN-1 Aircamper wing is therefore 348/60 = 5.8.

This is a relatively lower aspect ratio compared to the wing of a Cessna 150 (pictured right) which has an aspect ratio of approximately 6.95.



Here's some more info on the effect of the wing aspect ratio...

(1) As the angle of attack is increased, the corresponding lift that can be produced by a wing progressively increases as the aspect ratio is increased.

(2) Marked reductions in drag occur at higher lift coefficients as the aspect ratio is increased.

(3) A lower-aspect-ratio wing will stall at a higher angle of attack than a higher-aspect-ratio-wing.

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