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757 initial climb-out

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757 initial climb-out

Old 25th Dec 2018, 19:02
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757 initial climb-out

I'm looking for the assistance of a B757 pilot please.
Captain Sim (flight simulation) have produced a B757. However, there is something which I feel is not correct.
On take off, during the initial climb-out at v2+15, you are within the yellow band speed on the speed tape.
Once flaps are in, even at 190KIAS, the 190 is in the yellow band.
I've seen numerous Just Planes videos and I have never seen this in the 757. Surely the yellow band limit is much lower than 190 after take off with flaps 15?
Could some one PLEASE confirm OR dispute this for me.

Regards
Trevor
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Old 25th Dec 2018, 19:20
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Definitely a bug. I wouldn't want to be in the yellow band in the climb out during flap retraction. The flap schedule assures lots of margin above the yellow and red bands during acceleration. I fly the 737, but this applies to every heavy aircraft.
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Old 25th Dec 2018, 20:52
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What weight are you at? Vref80 in a 752 would only be around 190 in an empty aircraft with fumes in the tanks.
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Old 26th Dec 2018, 06:32
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Thanks for the response guys.
Could some one please refer me to a manual where the yellow speeds are explained OR describe very briefly how the speeds should appear on the speed tape.
I require hard evidence for the CS dev team.

One other thing I need to hear from a pilot - the yellow band speeds, do they indicate flap maneuvering speeds or stall speeds or what?

Thanks in advance

Trevor

Last edited by sags; 26th Dec 2018 at 07:33.
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Old 26th Dec 2018, 10:12
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I’m not a B757 pilot, but I do fly a similar type made by Boeing.

I suppose it depends what weight you are at and what speed you are using for your V2, have you checked to ensure they are correct?

The top of the yellow band on the speed tape is your minimum manoeuvre speed, so the top of the yellow band is 1.3 Vstall.
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Old 26th Dec 2018, 11:16
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Originally Posted by sags
Thanks for the response guys.
Could some one please refer me to a manual where the yellow speeds are explained OR describe very briefly how the speeds should appear on the speed tape.
I require hard evidence for the CS dev team.

One other thing I need to hear from a pilot - the yellow band speeds, do they indicate flap maneuvering speeds or stall speeds or what?

Thanks in advance

Trevor
Takeoff flap retraction schedule and flap extension schedule also change with weight. Did they provide you with one when you bought this addon?
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Old 26th Dec 2018, 11:40
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Once again, thanks guys.
Where do I find the stall speeds?
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Old 26th Dec 2018, 11:59
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You can find those speeds in the FCOM.
Maybe check out Smartcockpit for more information.

Those speeds are all determined by aircraft gross weight.
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Old 26th Dec 2018, 13:44
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I just Google'd "757 FCOM" and this came up: http://navfly.ru/wp-content/uploads/...ons_manual.pdf
Might not be up to date but should be enough for your needs. This is vol. 2, so you can study a bit about the systems. Try to find Vol. 1 and the FCTM.
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Old 26th Dec 2018, 14:28
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Thanks mate.
I appreciate everyone's help.
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Old 26th Dec 2018, 15:30
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As JFP says, the top of the yellow band is min manoeuvre speed, so at or above that you have full manoeuvre margin. Once in the yellow band that margin reduces until at the bottom of the band which will also be the top of the red/black is stick shake.

hth

dh
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Old 27th Dec 2018, 05:20
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My apologies for so many questions but I need to get to the bottom of this.
1. Is there a difference between a maneuvering speed (say Vref30+80) and a MINIMUM maneuvering speed for a specific flap position?
2. If so, how does one calculate it?
3. What is the difference between a stall speed and a MINIMUM flap maneuvering? and how is it calculated?

On the Captain sim 757 speedtape, the top of the amber band goes right up to 220KIAS after flap retraction - that is the flap maneuvering speed for a 220 000 lb take off after flap retraction, but surely the amber band should be at a much lower speed.
Please help and put me out of my confusion!!!!!!!!!!

Trevor
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Old 27th Dec 2018, 16:01
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Bit of terminology coming up. So the flap manoeuvring speed is vref+ 40,60,80 for flaps 5,1,0 and gives full capability at those speeds (at least 40deg aob). This is based on ac weight.

Min man speed is a function of angle of attack and ias. It is dynamic so you will see it move during a turn eg. It is only displayed on ac with speed tape so some of my 757s have no speed tape and there is no knowledge of this speed. “During​ normal conditions, the flap​ maneuver speed for the current flap ​detent should always be equal to​ or faster than the minimum​ maneuver ​speed.” This last bit is copy from FCTM.

i am surprised that the top of the amber band is at +80 - is it possible there is a software or programming fault?

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Old 27th Dec 2018, 17:31
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OP: please bear in mind that the CS 757 series is a very old product. Any bugs may not be resolved as the programmers and developers are focusing on new endeavors.

Unless of course you are referring to CS 757 3?
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Old 28th Dec 2018, 10:26
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In my pre-PPL teenage years when I had time on my hands (wife and kids saw to that...) I used to do a bit of simming. Nothing serious but now and again. CS757 was a very poor product IMO. Buggy as hell and very questionable handling. I battled with it for a while before giving up. Wasn't much fun trying to get it to work. Best add-on I ever had was the Dreamfleet 727. Very realistic and never came across any bugs.
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