Fuel delimiter valve ON/OFF having no effect in all flight envelopes (SP and MP)

[rogorogo]

Part of the startup procedure is to sett the "fuel delimiter valve" rocker into the upward position (on/open).

 

I have flown the module in SP and MP now since early release and having this valve either OPEN or CLOSED has had zero effect on the module behaviour and consequence states.
Not in excess maneuvers, not in limit maneuvers, not in positive or negative g's, not in damage states, not in anything noticeable where it should result in a different turbine behaviour (to the point of fault).

So it this actually background modelled in any way or is this (as of yet) just an animated rocker in the cockpit render?

Which is not a problem either way, just some clarification would be helpfull.

There is also no need for a trackfile, since you cannot "manufacture" a few small ones for the variety of testing scenarios, maneuvers and states applied.

Furthermore since there is a noticeable difference in many things between SP and MP with the module, which can be a little bit confusing sometimes.

[admiki]

What should happen in your opinion? This is crosfeed valve, not a pump.

[rogorogo]

noticeable change of CoG with unequal drain, or fuel starvation in a negative G maneuver if still only draining from a low state tank, or oscillation if one tank is still full while a drained tank is sloshing 

But again, this is not an end-of-the-world bug.

If its not modelled and just a rocker-animation it has zero effect on the module being enjoyable.
If it is modelled, then something is not yet where it is intended to be.

Edited December 13, 2021 by rogorogo

[admiki]

I might be wrong, but I think this valve affects only tanks 4 and 5.

[rogorogo]

if you are refering to this schematic:
 

then yes, it does.
but as you can see here (yes I know thats a D and a 35 export and some others, not a P)

the entire airframe, not just the powertrain is tilted to optmize certain envelopes (which it does very well).
The Shaitan-Arba basically always "hangs" under its powertrain, that is what you actually fly, the airframe is just tagging along (at various angles at various stages).

And nlike pop-up focused rotaries (where the powertrain is engineered to supplement the aiframe orientation as a primary design focus for the attack profile) the Hind is the only aussault-rotary ever built.
So the lower tanks, if out of balance should have a noticeable effect when changing envelope.
Just an effect, nothing that cannot be countered by trimming or just adjusting the cyclic but an effect - like the collective has noticeable effects on the airframe in all 3 relevant dimensions (yaw, pitch, roll) in hover-state (apart from angels ofc).

But again, if that is not modelled, not a problem for anyone - there are only a few that will even notice or care.
These days DCS has "players" mostly, not "flight-simmers" (that is not meant derogatory) - they do not primarily care about the fidelity of a full fidelity module, they will adapt to whatever behaviour it has.

So if Eagle has not yet found the time or has not plans to somewhat include that in their tables (and some things are very much table based, see VRS in different states or the noticeable VRS warnings in different states or RBS behaviour in different envelopes) - this is a non-issue.

If it is an oversight or something not working as intended, I have tried to bring attention to it, not more.

And I did not have the time to find proper sources, so my response was on google-level. But then, I also do not get paid for this.. and any time invested might suddenly fall victim to a black hole excession event without Ian Banks stopping by.
 

 

Edited December 14, 2021 by rogorogo

[admiki]

OK, I understand your initial point a bit better.

Since those tanks are so low under rotor and there is less sideways moment arm change available, any imbalance between the two might not be that obvious.

Regarding engine failure, even if one of those tanks is completely dry should not affect it. Engines are supplied from service tanks, which are interconnected anyway, both on input and output. Reason for that is exactly what you stated in your OP, to have both service tanks supplied and connected to both engines at all times, so any flight modes would not affect engines. Damage is different story.

Now, why Soviets decided to isolate only those two tanks, I have no idea. Must be a "Soviet thing".

[rogorogo]

vor 15 Stunden schrieb admiki:

Now, why Soviets decided to isolate only those two tanks, I have no idea. Must be a "Soviet thing".

Well, for the reasons I stated in my original post.
But again, compared to other issues this is neither a big deal nor a priority. 
There are other things that would need attention - and not just for niche fidelity interest percentiles but all purchases segments.

We shall see - or not.
Either way those that are attentive should not cease to provide information, no matter how it is treated.
Because - and that is part of the overall systemic issue - this is literally a standalone product. 
There is nothing like it, it is a de-facto monopolist product and product provider.

[Quati]

Did anyone tried Closing the Valve, Turn Off the N°5 Pump so the Service tanks would be filled only by N°4 tank (or turning the N°4 Pump and Use only N°5 tank).

Because I think that only turning off this Valve and leaving the N°4 and N°5 Pumps would not make such difference, except if we have a fuel leak that it should prevent also draining the other tank through the leak.

[rogorogo]

vor 13 Stunden schrieb Quati:

Did anyone tried Closing the Valve, Turn Off the N°5 Pump so the Service tanks would be filled only by N°4 tank (or turning the N°4 Pump and Use only N°5 tank).

Because I think that only turning off this Valve and leaving the N°4 and N°5 Pumps would not make such difference, except if we have a fuel leak that it should prevent also draining the other tank through the leak.

I did not to be honest - but I also focused more on the lack of noticeable effect as described - I was basically flying around for 2 months with the valve closed,,, both SP and MP in all situation under my control and completely out of my control to have a wide scope of scenarios and datapoints.

But it sure would be interesting - it is also true that under normal envelopes it would not be noticeable.
But we tend to fly in extreme combat turns... and there was a reasons that crossfeed valve was put there and only there for those two tanks.

Maybe someone finds the energy to fly this in a replicable scenario with just one pump running and the crossfeed OFF to see what happens and if anything noticeable happens.