The use of the spanwise foam boards between the ribs of an Affordaplane ultralight.

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lr27

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Re: The use of the spanwise foam boards between the ribs of an Affordaplane ultralig

Aren't those where the spars should be?
 

Aerowerx

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Re: The use of the spanwise foam boards between the ribs of an Affordaplane ultralig

The standard AffordaPlane wing is a "ladder" type. The "spars" are the tubes at the leading and trailing edges.

So, yes, you could say that they just stabilize the foam ribs. Most of the structural strength is in the leading and trailing edge tubes.

As an alternative you can also use bent aluminum tubes for the upper surface of the ribs.
 

Aerowerx

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deskpilot

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Morphett Vale, South Australia. Just south of Adel
Re: The use of the spanwise foam boards between the ribs of an Affordaplane ultralig

Mine are similar to what Aerowerx shows. They are not fixed to the spar tubes but are slipped into pockets in the Dacron skin rather like battens in a sail boats mainsail..
 
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