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Post on Wing Strut Cuffs in Avidfoxflyers General Hangar
By skypics, postedI have flown the model B STOL and now the MK4 STOL and had noticed when flying that I could see a vibrating ripple in the fabric just behind the leading wing strut.
I placed yarn telltales in that area and was amazed and mystified at what was revealed.
When climbing out the yarns were flowing back in a streamlined fashion as expected. However, when I leveled out the yarns actually turned 180 degrees and faced FORWARD!
Finding a wing cuff for an Avid is impossible so I went through many iterations until I hit on the right combination.
Now the yarns stay streamlined al all AOA. Can't say how much drag was eliminated, but it should be substantial.
To see this change check out skypics234 on YouTube.
John M