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What do you suppose is going on here with the dark patch ? it seems to be common on a few aircraft in the fleet ?
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It is steel. As James stated, it is a blast panel. It is not painted at all and, believe it or not, it is greased by the ground crew to facilitate cleaning! I've seen this on the Su-25 but am sure it applies to all cannon armed Soviet and Russian aircraft where the barrel is near the skin. Also, note that the blast panel is higher on two seaters as it serves to protect from the blast effect (single seaters have electronics in that area).Might be to hide the staining from firing the gun. I know on the Cf-118s it is a cast iron b#$ch to clean off the residue and involves a lot of elbow grease, especially since corrosive cleaners are no longer allowed.
Thanks for that. I probably would've found them eventually, but I'll certainly keep an eye out for them when the time comes. I like the Master pitots...they've found their way on a few of my builds.By the way, I am not insisting anyone gets them but simply stating they exist.
Nice that it is designed for a two seater as well!also broke my rule about after market today but its an addition not a replacement part so not beating myself up over it