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Posted

Regarding the VNAV, i saw in the manual that you first put an altitude in H, then press enter. Clear the other fields and put in an altitude for which waypoint you want and it will auto calculate the climb values for the flight. Is that right? or how do i do it?

Posted

im also interested in the systems that 'calculate climb values'. If there is such a thing. i.e. Is height taken into account by the pvr? And will autopilot follow this?

 

Still a noob here -but getting there.

[sIGPIC][/sIGPIC]

Posted (edited)

Hi guys,

 

The following is my understanding, but I am not 100% sure on it yet, need more testing.

 

VNAV does work, but it is not followed by the AP, as far as I know. Where it does show is when you use the FD mode of the AP, which is for hand flying. In FD mode, there are bank cues, to guide you through the route you have programmed, as well as vertical cues, to achieve the altitude programmed in your ABRIS.

 

Other than that, when not in FD mode, the ABRIS will give you the required vertical velocity to achieve the programmed altitude at the programmed point. That would show on the NAV page of the ABRIS, on the bottom 1/3, where you can see distance to waypoints, cross-track error, etc.

 

Best regards,

Edited by miguez
Posted
does it even worth to use this feature?

 

That depends totally on the mission (ferry vs. combat, for example), and the amount of realism you want in your simulation. ED just simulated what the real thing has, it's up to the pilot to use it or not.

Posted

VNAV is primarily used by AIRPLANES for published arrivals with crossing restrictions, accurate vertical path for non-precision approaches, and efficient idle descent planning. I cannot imagine a scenario where there is a practical application in a helicopter, at least none that will actually reduce pilot workload. When I first saw VNAV mentioned in the ABRIS portion of the manual, I actually laughed. Purely a guess, but perhaps the ABRIS was designed for use across many platforms and not every feature was intended for use on every platform.

 

And NOTHING in the ABRIS which isn't already programmed into the PVI will provide FD or autopilot guidance. The vertical portion of the FD is driven by the Auto Hover system or altitude commanded by the collective brake.

 

Smokin' Hole

Smokin' Hole

 

My DCS wish list: Su25, Su30, Mi24, AH1, F/A-18C, Afghanistan ...and frankly, the flight sim world should stop at 1995.

Posted

VNAV is an ABRIS function (not PVI-800) and such is an information display only and is not available to drive any autopilot or anything outside of the ABRIS screen. The Flight Director does not use ABRIS VNAV data at all. Ultimately the ABRIS is a commercial-grade system used in a variety of aircraft, military, commercial, fixed-wing, and rotor-wing and as such is not custom-tailored to the Ka-50.

 

The VNAV function can auto-calculate either vertical speeds (given altitudes) or altitudes and TOC/TOD points (given vertical speeds) over given "VNAV legs" which can be waypoint-to-waypoint in the simplest case, over multiple waypoints, or additionally over legs with endpoints defined as displacements (S - delta km) from the waypoints. VNAV is also affected by the airspeed given in the flight plan.

 

VNAV has its uses in the Ka-50, for example stepped or planned climbs to high altitude. Seat of the pants flying can get you there but well-planned VNAV-assisted flight plans can get you there with more fuel. You'll want to be familiar with concepts such as Vy, normal lapse rate, and economic cruise altitude before attempting to use VNAV in a meaningful way.

 

A well-planned vertical profile involves less changes in flight regime and less extreme regimes which lessens pilot workload, saves fuel, and reduces the chance of airframe and engine damage.

Posted

But! all this economy and the other things are irrelevant in the simulation because each time we start a new mission we get a new helicopter.

Posted

Relevance is a question of how strongly you wish to interact with the sim in a realistic way.

 

I'm looking up the method of deletion and re-ordering of waypoints. I have a feeling that re-ordering is going to be the best way of deleting where you just don't include a waypoint in the "new order."

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