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Big engines & Prop-wash mods

Beej

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This would apply to all biplanes. If you are planning on a big powerplant, take into account the prop-wash that can 'drum' your fabric causing it to crack.


The solutions are 1 inch fabric stitching andeither i) plan for extra ribs placed in the middle of the first 2-3 bays [I learned the hard way, trying to add extra ribs after the fact is a pain], ii)plywood skin those 2-3 bays, or iii)double-fabric-skin the bays.


Even with smaller powerplants, I have been told that double fabric skinning in the prop wash area helps.


If anyone would like to add to this please do so.....
 

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