Wing Aileron 21-9-2, 21-9-4

With only a few steps left to complete the ailerons, I removed the trailing edge wedges and got both ailerons ready for applying sealant to the trailing edge. This involved scuffing and acetone wiping the mating surfaces on the skin and trailing edge wedges, and making sure both ailerons were positioned to lay flat on the workbench.

Ailerons positioned for inserting the trailing edge wedges

This was the last chance for me to check that there was no twist in the ailerons and that they lay completely flat

Next I mixed up about 44g of proseal (40g sealant + 4g hardener) using a scale that measures down to 1/100g, and a 60ml syringe to apply the proseal to the trailing edge wedges. After installing both wedges and clecoing them to the alignment jigs, I double checked that both ailerons had zero twist, and left them to cure for several days.

First time mixing proseal by hand using a cutoff popsicle stick and an acrylic plate on which to mix.

Aileron trailing edges curing. All remaining holes were clecoed to maintain alignment, and boards/weights were placed on the ailerons to ensure they remained straight and flat

While the trailing edges were curing, I decided to finish riveting the end ribs using CS4-4 blind rivets. This was quick and easy.