The A2A Simulations Community

Hi everyone.

Larry insists in setting the cowl flaps to the TO position while taxying. The other day during a hot 40 deg + Las Vegas departure I had to shut down and let the engines cool down short of the runway. Temps were well over 200 deg. Also he seems to overabuse the booster pumps. It´s like He is lacking a "ground mode" routine.

Otherwise having tons of fun. You guys got me addicted once more.

Regards, Javier

Hi!

Yeah, I noticed that too. But I would work around it by takin control of the FE station and setting the cowl flaps myself. I just haven't tried yet, if he sets the cowl flaps back to 3", after you give him the FE station back.
Have you tried using full rich mixture? I think at hot days like that, it wouldn't be wrong. Bit more cooling.

Cheers

Hi,

Cowl flaps aside, shutting down and waiting in those temps is not unrealistic.

I tried it the other day and ended up cooking two engines, simply because I couldn't keep them cool (the cowls were wide open).

Got to remember there are 28 very large cylinders sat there to make a lot of heat.

Try taxiing on two and then shut those down, and start the other two. By the time you get all four up adn running you should be good to go and within temp limits.

Remember, 170°C CHT is max. before takeoff. In hot temps, I'd recommend 150, and throttle back ASAP and accelerate after lift-off if terrain permits.

Best regards,
Robin.

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A2A/AccuSim. 'nuff said!

As I explained in another thread about a similar problem (can't find it right now) the FE does indeed not open the cowl flaps to more than 33% (3 in.). the reason is a simple limitation within the logic matrix for the FE. As there is no "direct" communication between the simmer and the FE the latter does not know about the intention regarding take-off. Inorder not to be surprised by an immediate T/O we have decided to open the cowl-flaps not more than 33%. Nevertheless if you need them open 100% due to ambient temperatures you simply switch the FE off for that period, open the cowl flaps, close them to 33% again when take-off is imminent and hand over controls to the FE. There's not much we can do about this. It's just not possible to have all eventualities handled by the FE.

Btw, if you hand over controls to the FE when cowl flaps are still at 100% the FE will close them due to an error in the logic to 39% (3.5 in) only (he needs some time to do so). However this is not critical at all operationwise and during climg he will handle them as usual. Just don't try to take-off while they are open at 100%. This has been tried once in real life operations and the outcome ended in a fatal crash.

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Oskar

i7-2600k OC 4.4 GHz, ASUS P8Z68-V PRO, WIN7-64Bit, 8GB DDR3 1600MHz, 1x OCZ Vertex 120 GB, 1 x OCZ Ibis 480 GB, 1 x GeForce GTX 580, 1200 W Power Supply, 2 monitors, ASE, EFB on remote PC

Here is what I do. I turn on the FE before start up, and hand over everything to him. He'll prep his part. Once he gives you the all ready turn him off and open the cowl flaps. Start the engines and taxi and do the run up with the FE off. At the hold line close your cowl flaps to the 3" mark then turn on the FE. Your engines should be nice and cool or at least under the 170.

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I just got an idea: how about you override the adi switch one the ground? Never tried it, but you can open the adi valves manually. Would that have an effect for ground ops in hot weather? I mean, I could bet, that this wasn't a standard procedure^^ But I'm curious, if it would work. Gotta try it out some time.

No, it doesn't and btw it wouldn't be a good idea. The cooling effect of the water injection is only available at a relatively high power loading. Under conditions close to idle you would simply "drown" the engines.

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Oskar

i7-2600k OC 4.4 GHz, ASUS P8Z68-V PRO, WIN7-64Bit, 8GB DDR3 1600MHz, 1x OCZ Vertex 120 GB, 1 x OCZ Ibis 480 GB, 1 x GeForce GTX 580, 1200 W Power Supply, 2 monitors, ASE, EFB on remote PC

That's exactly what I mean !

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Oskar

i7-2600k OC 4.4 GHz, ASUS P8Z68-V PRO, WIN7-64Bit, 8GB DDR3 1600MHz, 1x OCZ Vertex 120 GB, 1 x OCZ Ibis 480 GB, 1 x GeForce GTX 580, 1200 W Power Supply, 2 monitors, ASE, EFB on remote PC

Ah, ok. Thx for the info.

You know what they say about great minds

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I was going to suggest that it could be linked to the flap setting. For any setting between 0-20° the engineer could open the cowl flaps wide. Once set to 25° for take off, he could close them to 3 inches. After landing, when retracting flaps during taxi he could then open them again once the flaps are less than 25° (point being that the same logic is applied as before take off). However, it seems like a fairly obvious idea, so there must be a reason why it isn't suitable?

Is there ever an occasion where a take off might be performed with less than 25° of flap? That would certainly cause an issue with the above!

If that were the logic then you might have the FE opening the cowl flaps while retracting or extending the flaps after take off and on approch. Both would be bad.

Maybe of you have your above idea while adding a limit to airspeed. Like if the flaps are under 20 and airspeed less then 15kts then cowl flaps could be opened fully?

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The linking is not a bad idea. Maybe the wide opened cowl flaps could be linked to the following conditions:

1. weight is on the wheels
2. Flaps are up/ less than 25°

This way, you could taxi to the runway with flaps up and cowl flaps fully open, set 25 just before takeoff, so the FE can close them to 3".

At landing, it would only open, if weight is on the wheels and the flaps are up/ less than 25°. And as the flaps should only be retracted after runway turnoff, there shouldn't be any problems with too early opening of the cowl flaps.

I guess a weight on wheels should be doable in fsx. Otherwise an autobreak like in jets wouldn't work, right?

I wonder what the general feeling is about a dialog box for the captain which would make it possible to give instructions to the crew?

That'd be great! An option to make PAs would be awesome, too. Like in turbulences. More immersion and interaction. Would make me feel more like the captain.