Brief Description: Repaired extra CS hole in HS spar
Email response from Van's arrived earlier. Repaired the extra countersink in HS-903 (from 05.02.2011): Clecko'ed both spars to a scrap piece of aluminium. Applied release agent (wax) to the aluminium and filled both offending holes (with the unnecessary CS) with two part epoxy glue ("UHU plus Endfest 200". Backed it in the oven for 5 minutes (set at 180°C). Worked out fine, the forward side (with the unncessary CS where the spar doubler will fit) was flush. Just some dollops on the backside. Have to file/sand them away prior to (re-) priming.
EDIT 17.02.2011: Aluminium treated to T3 (such as the spars) start to loose strength when exposed to high temperatures, starting as low as 70°C. A test with a temperature sensor showed that the temperature in the oven with an open door was not more than 60°C, even though the thermostat of the oven was set to 180°C. This temperature is well below the threshold where aluminium starts to loose strength. So the heating of the aluminium was within limits. Care should be taken on repeating this procedure not to exceed 50...60°C (130...140°F).
Deburred ribs and spars. Scuffed ribs for priming.
Next: Scuffing the spar and degreasing all components.
