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Search: Posts Made By: gipsymagpie
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Forum: Rotorheads
7th Aug 2022, 06:46
Replies: 86
Views: 29,327
Posted By gipsymagpie

There are many versions of the APM2000 type AP -...

There are many versions of the APM2000 type AP - huge difference for example between the 3 and 4 axis versions of notionally the same thing. I was just appalled when moving from a 4 to 3 axis...
Forum: Rotorheads
6th Aug 2022, 15:31
Replies: 86
Views: 29,327
Posted By gipsymagpie

Not so much the new AFCS. The Helionix GA is...

Not so much the new AFCS. The Helionix GA is exactly what you want - maintains track, initiates a climb to the preset altitude, holds airspeed, manages NR in the event of OEI and initiates the...
Forum: Rotorheads
6th Aug 2022, 13:17
Replies: 86
Views: 29,327
Posted By gipsymagpie

Airbus has recently started reacting to the...

Airbus has recently started reacting to the demand from the coal face for more information about the AFCS. There are some excellent Flight Operations Briefing Notes (FOBN) for the AFCS on Helionix...
Forum: Rotorheads
5th Aug 2022, 18:02
Replies: 86
Views: 29,327
Posted By gipsymagpie

I agree. 4 axis is always GA for us. It does...

I agree. 4 axis is always GA for us. It does exactly what you want.

You're right it doesn't matter which way you go around but given how infrequently outside your six month check ride you...
Forum: Rotorheads
5th Aug 2022, 17:52
Replies: 86
Views: 29,327
Posted By gipsymagpie

I don't really need to get back on topic. I am...

I don't really need to get back on topic. I am just concious this is a good resource and I would love to change the topic title to "SAS, ATT and other AFCS animals"

Anyway, we fly approaches at...
Forum: Rotorheads
5th Aug 2022, 08:06
Replies: 86
Views: 29,327
Posted By gipsymagpie

Interesting thought but actually from a coupled 3...

Interesting thought but actually from a coupled 3 axis approach (eg ILS) it very much does have to be upper mode change first, power second.

If you pull power while still coupled on the approach,...
Forum: Rotorheads
4th Aug 2022, 14:02
Replies: 86
Views: 29,327
Posted By gipsymagpie

Here's a proper description of stick jump from...

Here's a proper description of stick jump from Eric Fitzpatricks book on flight test in the chapter about flight control characteristics:



The Bell 412s I flew needed a microscopic amount of...
Forum: Rotorheads
4th Aug 2022, 13:58
Replies: 86
Views: 29,327
Posted By gipsymagpie

The H145 Helionix AFCS has protections against...

The H145 Helionix AFCS has protections against inadvertent coupled entry into autorotation (and so by inference protection from NR split off). Also has a handy marker on the otherwise diabolical FLI...
Forum: Rotorheads
4th Aug 2022, 13:44
Replies: 86
Views: 29,327
Posted By gipsymagpie

Ah, the joys of Go Around mode on a three-axis...

Ah, the joys of Go Around mode on a three-axis (ie no collective) autopilot where there is no speed protection. A certain recipe for unexpected death in an IFR go around for the unpracticed. The...
Forum: Rotorheads
1st Aug 2022, 19:10
Replies: 86
Views: 29,327
Posted By gipsymagpie

Ah. The recognise bit is sometimes called fly...

Ah. The recognise bit is sometimes called fly through mode on some types (eg airbus). The system has force sensing in the controls and it automatically changes mode from ATT to SAS in the appropriate...
Forum: Rotorheads
1st Aug 2022, 15:55
Replies: 86
Views: 29,327
Posted By gipsymagpie

True but the force gradient on 412 is quite steep...

True but the force gradient on 412 is quite steep in ATT so it only takes a small pressure to end up with stick jump.
Forum: Rotorheads
1st Aug 2022, 15:27
Replies: 86
Views: 29,327
Posted By gipsymagpie

Pretty sure the 412 doesn't recognise pilot input...

Pretty sure the 412 doesn't recognise pilot input in ATT, same as 109. I certainly remember the beeper trim being too slow for precise hover work and the force trim release causing way too much...
Forum: Rotorheads
31st Jul 2022, 19:09
Replies: 86
Views: 29,327
Posted By gipsymagpie

Now autopilots. While our SAS (with trim) is...

Now autopilots. While our SAS (with trim) is usuay good for VFR, for IFR there are stricter requirements about how much deviation a SAS actuator runaway is allowed to cause and the amount of...
Forum: Rotorheads
31st Jul 2022, 18:37
Replies: 86
Views: 29,327
Posted By gipsymagpie

So that's SAS (yaw is usually the first thing...

So that's SAS (yaw is usually the first thing that's SAS'd following by pitch and roll but rarely collective). The actuator for SAS is in line with the controls so you cannot feel it working but it...
Forum: Rotorheads
31st Jul 2022, 17:00
Replies: 86
Views: 29,327
Posted By gipsymagpie

So I would start from scratch and dispel a few...

So I would start from scratch and dispel a few myths here. For one the autopilot does not "fly" the aircraft through the trim motors. I will explain.

So take a raw aircraft and let's give it a...
Showing results 1 to 15 of 15


 
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