Feature request: Implement high pressure cutoff

[colingeniet]

The high pressure fuel cock is controlled by the thrust lever, see JA37 english manual sec. 9 (engine) par. 2.2.3.1 and 4. It is distinct from the low pressure fuel cock controlled by the cutoff switch.

To do:

• [x] Add high pressure cutoff logic
• [x] Implement cutoff catch (and choose which version of the implementation)
• [x] Add flight idle indent
• [x] Review positions of A/B indents (make sure to keep it coherent with A/B zones etc.)
• [x] Update autostart
• [x] Update checklists

[NikolaiVChr]

Is that what this image shows, throttle positions vs. engine response: So either 0-3 deg or 3-9 deg throttle position?

[NikolaiVChr]

That image is from the "Short RM8A engine description" document. I posted it in discord yesterday.

[colingeniet]

Cross checking your picture with JA37 english manual section 9.4:

• 0-3 is the just the stop
• 3-7 is the cutoff position
• 7-9 is the catch for the cutoff position (catch must be lifted to go from idle to cutoff)
• 9-13 is ground idle
• 13-16 is the ident for flight idle (i.e. min power from which the aircraft can quickly spool up) I would like to add the cutoff zone and catch, and (independently) the flight power indent.

For the cutoff catch, I see two ways:

• click the throttle to switch from cutoff to idle (sort of like the f16)
• make the cutoff a regular throttle zone, so that the throttle can be pushed normally from cutoff to idle, but you need for instance to click it (to simulate lifting the catch) to go back to cutoff

Which would you prefer?

[NikolaiVChr]

Not sure, they both sound good. I will leave that to you. :)

[colingeniet]

By the way the positions of the AB indents on the pictures do not quite match the ones we have (rounded: 70,84,98, versus 70,82.5,95) so I will also change that if you see no issue.

[NikolaiVChr]

I see no issue, feel free to improve it. This is what I modeled what we have now from:

[NikolaiVChr]

I think I took IDLE as 0 and scaled it that way, don't remember.

[colingeniet]

Oh, that's perfect with the two together. I mistook the 13-16 zone for the flight idle indent, but it actually is the ground idle catch. I guess 7-9 is the actual cutoff position, but does not have a physical marker on the throttle scale. I should have everything to do it correctly now.

[NikolaiVChr]

I could not click on the handle, but change 2 lines in this component and then you can click on handle:

<switch name="names/fcs/throttle-cutoff-catch">
            <default value="fcs/throttle-cutoff-catch"/>
            <!-- In the cutoff zone, always go back to resting position -->
            <test value="0">
                fcs/throttle-pos-deg-limited lt 13
            </test>
            <!-- If resting and beyond the idle position, engage -->
            <test logic="AND" value="-1">
                fcs/throttle-cutoff-catch == 0
                fcs/throttle-pos-deg-limited ge 15
            </test>
            <!-- If beyond flight idle, do not hold the lifted position.
                 This is purely for gameplay (IRL the lifted position would not hold anyway).
            -->
            <test logic="AND" value="-1">
                fcs/throttle-pos-deg-limited ge 24
            </test>
            <output>fcs/throttle-cutoff-catch</output>
        </switch>

Furthermore I can move the throttle in the entire range when it is both below the latch and above it. Thats not intended is it?

[NikolaiVChr]

Plus the launcher states dont work properly after these commits.