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04-30-2005 | 02:31 PM

#4

barryb-RCU

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From: Austin, TX

RE: BEST WINGLOADING FOR 3-D

My favorite 3-d plane is a 35% Von Extra 260 with a wing loading of 28.3 oz/sq foot.

Wing loading doesn't scale with size. Cubic loading does a much better job of indicating how performance scales with size.

With the cubic loading measurement, below 10 is acceptable and below 8 is really great for a monoplane. For a biplane below 7.5 is good and below 6 is really great.

If you fly something with a floater-type wing on it (e.g. a U can Do), the formula is not as representative.

The expression to calculate cubic loading in excel is =B4*16/power(sqrt(B3/144),3) where b4 is weight in pounds and b3 is wing area in sq. in.

Here are the cubic loadings for some of the planes I've owned or flown :

Code:

 
                         Von Extra 260 35%     AW 33% Edge 540T      FC 35% Extra 330     Hyde Dumbo Vision
 weight                   22.9                                 27.8                                 25                           15.8
 wing area              1870                               1870                                1861                        1600
 cubic loading           7.82                                 8.31                                 8.68                         6.82

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