Been flying each type now in ATAG chasing this one down. Yes I can now replicate it. Its just happening at different altitudes for some types. Unless you push on up there you wont see it. Previously I was limiting my tests to around the altitudes the Spit 1A 100 Octane was being affected thinking it would be the same for the other Merlins, I was wrong. RC2 and the STEAM release are the same in this area.
So far the types I have found it in are:
Spit IA 100 Octane
Starts at 9500ft at +6/3000RPM
Spit IA, Hurricane ROTOL
At +6/3000rpm onset is at 11,500ft. Reduce RPM to 2800 gives smooth operation until 13,500ft where further RPM reduction is required to 2700RPM,until 14,500ft when 2600RPM is required.
Once you get to FTH 2600 seems to be ok as the gradual reduction in boost prevents it.
SPIT IIA
Unaffected I have climbed the IIA in ATAG from the deck to 29,300ft at +9/3000RPM/2800RPM without issue.
So At present in the Spit IIA you are ok
Spit IA,Hurricane ROTOL just don't fight above 11,500ft ... sad but that is the reality at present.
Still testing the others to determining the rough running boundaries
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