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Silencing AI Gliders

G

GNZLAP

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7
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newzealand
I am casting the net a little wide for this one, my apologies for cross-posting.

I'm tinkering with an FS9 package for some AI gliders.
Previous work has been done by Bert de Bruin, using motor glider files modified by Alan Kaiser (stemme.air) and aircraft.cfg files modified for Wolfgang Piper’s excellent glider models.

Unfortunately they all go Brrrrrr...
My understanding is:
AI sound is not mapped to the aircraft, but to the engine type.
That sound resides in the main sound folder, and is used by all.
If I alter it, all the AI Cessna's will sound like sailplanes!
Browsing in the default aircraft files, I note that there is provision for a rocket engine! (Type 4)
I don’t know if there are any rocket-powered planes in FS, but I’m willing to hijack their sound for this cause.

So I am thinking there must be a way to create a very meek rocket engine to power the gliders around, with an appropriate accompanying wind whoosh sound.

This is way outside anything I have ever tried.
I was wondering if any of the brilliant minds residing here could cast some light on the problem?
Far as I’m aware this has not been attempted in MSFS.
 
FS don't support rocket engines, only CFS does. Therefore I don't believe it is a viable option to define the AI gliders as rockets since the sim has to calculate the flight dynamic for the AI planes too. But who knows?

My not fully serious proposal: switch to FSX. In this sim you can define the sound for any AI plane individually. ;)
 
Yeah I've discovered the problem goes away in FSX, as you can define individual sounds for AI.

However, I got to thinking about this when I found this in the stock FS9 Cessna aircraft.cfg:

[GeneralEngineData]
engine_type = 0 //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
Engine.0 = 2.4, 0.0, 0.0 //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar= 0.88 //Fuel flow scalar
min_throttle_limit = 0.0 //Minimum percent throttle. Generally negative for turbine reverser

Clearly someone thought it was a category of engine in FS9.
My further thought was to exploit this (since, as you point out, there are no other rocket planes in FS9).
SO my question is: if there can indeed be a rocket engine specified, what's involved to define one with a very weak thrust for an AI glider?
 
From the SDK:

Integer that identifies what type of engine is on the aircraft. 0 = piston, 1 = Jet, 2 = None, 3 = Helo-turbine, 4 = Rocket (not supported) 5 = Turboprop.
Click to expand...

The rocket engine is a lagacy of CFS but don't work in FS9. More exactly: I was not able to make it work. I remember I tryed to import the CFS V1 from CFS in FS without success. Perhaps you can find a solution.

FS9 gliders with simulated winch start use usually a jet engine with a very small fuel tank. But this will not help you.
 
I do realise it's a bit presumptuous to arrive so late in the product cycle and question why something has not been done...
Still, if you don't ask you won't know.
Next question I would have is: "OK, not supported means what? They didn't include a rocket in the sim, or you can't include a rocket in the sim?
Your experience may point to the latter unfortunately, but I haven't quite given up yet.
(The V1 is a pulse-jet!)
AI is a bit off the beaten track, so I'm hoping someone may have missed something.
 
AI is NOT a bit off the beaten track by any means. A great deal of work has been done on the variations possible with AI on many specialist sites both in terms of the aircraft and scenery required to get the best out of the sim with the maximum realism. The SDK, as has already been said, declares that the Rocket type engine is not supported in FS9, and experimentation has so far proven this to be correct. It is unlikely that a solution will now be found for FS9 since FSX solves this particular problem for us.
 
No offence intended...many mainstream users do however glaze over somewhat when AI behaviour is discussed.
But that is another discussion.
I guess I'll just finish off my little package, and loudly signpost the fact that one should ignore the buzzing!



EDIT: My son just walked in and reckoned he'd just hit the mute button, so there you have the problem solved...
 
Last edited:
Hi,

I do not know if it works because I haven't tried it but suppose you open the .air file with say Aired, change the aircraft type to 0 (pilotable) and engine type to 2 (glider), wouldn't that at least make the brrr sound go away?

Rob
 
Hi,

Well, it works allright: the sound is gone.
Unfortunately I forgot you need an engine to make it fly as AI.
So forget I mentioned it.
 
Haha I had just composed a witty reply to that one, involving a sustained downward flight spiral...
Appreciate your giving it a thought though!
 
robystar said:
Hi,
Unfortunately I forgot you need an engine to make it fly as AI.
Click to expand...

That's what I found out the hard way during my previous work on AI-gliders. Another approach to solve the "brrrr-problem" was to disable the AI-prop sound files. Then the AI-gliders were quiet and they flew. Unfortunately the AI-prop-engine planes became quiet as well. ;)

Bert
 
Of course my effort is built entirely on Bert's excellent earlier package.

Bert I've taken you at your word:
You can use this package as an example to make your own AI-glider-airfields and AI-glider_trafficfiles. It is my intention to upload other AI-gliders in a short time.
I had hoped to build further on that by using a silent rocket engine (type 4) even though this is not supported in the SDK.
I have just about given up on that, so I'll work around it by getting the tow plane tighter and noisier! At least that way on the ground you should not notice the Brrry glider...

Bert have you done any others since the Duo Discus package?
 
Yes, feel free to go ahead. By publicing what I had achieved back then I was hoping somebody would pop-in and get the "project" on a higher level. Because eventually I was not satisfied with the overall result (the "thermal" AI-flights are too instable when the wind-factor comes into the picture) I lost interest in further developement for FS2004.

I don't know if the Duo was the last one I did. I publiced everything on Avsim.com back then, so if you take a search there with keyword "bruin", and you'll find them all.

Bert
 
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