endotherm
 First Officer
Flight distance : 503241 ft
Australia
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solentlife Posted at 2018-5-15 11:19
I can vouch for boats moving far more than just cms in pitch and roll .............. it can be metres at times ...
I do have to say - your sinusoidal claim is just plain not on mate ! Boats do not hold at any point in that swell or waves ... its only when surfing with significant waves / swell that they may do it.... when they hold for a second or so when pitched up or down at max.
I'm not sure why you are always looking for a fight, especially when there isn't an issue. You may want to read the carefully worded posts a little more closely. Of course boats can move meters at a time in pitch and roll -- I never said otherwise -- similarly they might only move centimeters. The overall point of my post was that the system can react to a left-stick-down as long as the movement isn't too severe.
With regard to the sinusoidal claim, if you examine it mathematically, I am referring to the period in the oscillation where the vertical movement in the Y direction is at a minimum (i.e. slowest) over time (X) which is the longest relatively stable period in the wave, before it repeats at the other side of the wave.
I'm obviously talking about the period in the wave bounded by the red box. Not the heaving pitch represented by the rapid rise and fall of the purple arrow (perhaps representing meters). The small rise and fall represented by the small pink arrow representing perhaps centimeters. A bit like a fighter jet landing on a heaving carrier will be more successful at the flatter apex, rather than crashing into the deck during a rapid rise/fall. Once again, my post postulates that it may work in the relatively slower/stable period at the apex, but would not work elsewhere in the oscillation.
Whether or not there is sufficient time in this period for shutdown to engage whilst the vertical movement is slow was not really discussed, and isn't going to automatically apply in every situation. I never made out that a boat had to hold perfectly still at any point. Once again, the post is all about still responding to left-stick-down while there is some movement. To dismiss this point as "plain not on" without comprehending the post is not particularly fair nor accurate. You then go on to contradict yourself and concede that "...they may well do it when they hold for a second or so...".
You claim the requirement of 3 seconds is a fact and not less. I have performed many tests on firm ground and timed them, to authoritatively respond to other posts on the subject. It is not a set time. It could be as short as about a second should the aircraft decide it has become sufficiently stable after descent. Hence my statement "It doesn't need to maintain that position for the 3 seconds mentioned above, it reacts much faster than that" (referring to more stable environments). Of course it may take longer, and require 3 seconds or more in turbulent environments. I can't speak to every occurrence of conditions on a boat on every occasion. I was only speaking about conditions where the peak and trough was calm enough to allow the aircraft to register movement slow enough that it would engage shutdown.
You then essentially confirmed trying the stuck-in-a-tree scenario, assuming it would work. In your case the movement was obviously above the threshhold, requiring CSC. I don't doubt that at all, and once again that was the purpose of my post. That does not negate the point I was trying to make -- that left-stick-down would work in low movement situations.
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Captain
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Second Officer
