Merlin negative G cutout too quick?

Originally Posted by IvanK

Here is a small video. Starts with throttle at idle then to max Boost.
Then a slow descent initiation with max Boost set.
I would be interested in your opinion on the RPM needle Bounce as well as the cough which starts about 19seconds in:

I figure (based on experience) that the descent entry is less than 0.2g decrement on 1G i.e by estimation G is never getting less than +0.8G ... pretty slow entry and still it coughs

regarding the needle bounce I think it's overmodelled. RPM gauges are connected by flex cable to a reduced gearbox attached on a specific slot on the back of the engine, so they're as accurate as it gets. You can get high frequency vibrations, but oscillations like that means that either your instrument is fooked or your engine is actually doing those oscillating RPM peaks (which is weird..).