The 757 speedbrakes seem very ineffective when compared to the 762 or 763. When they are extended in flight they even appear different from the 762, 763, and default FSX A321 and 737-800 but they do agree with several other addon planes that I have. On the 757 I only use VNAV to takeoff, climb or cruise. For decent I use SPD, V/S, and HOLD and I start the decent usually about 30 nm before TD. Any decent rate at 2000 fpm or above the speedbrakes won't even maintain the current speed much less slow the plane down. Do other people have this problem or is it just me? About six months ago I changed some values for the spoilers in the cfg file but it made no difference. Does anyone have and ideas?

Thank you
Michael Cubine

You noticed it correct. Compared to default FSX planes that virtually hit a brick wall when spoilers are deployed 100%, CS planes do not do that. If I plan and program my flight accurately before take off which includes the destination runway and proper TD, I can land the bird with no issues using some spoilers. I closely follow instructions on FMC when spoilers are needed.
Now, as far as which is accurate in terms of real 757's, only a certified pilot can tell. IMHO, as far as accuracy is concerned I am more inclined to go the route of CS than stock aircraft.

Hi Michael,
To estimate the TOD use the 1:3 rule: to descend from FL 350: 3 x 35 = 105 nm.
Throttles at idle (FLCH) i descend around 2.300 fpm to FL100. 1.500 - 1.800 fpm at 250kt down to the glide slope intercept altitude. There is no need to use the speedbrakes in a well planned descend.
And if i have to use the speedbrakes due to ATC the bird drops at 3000 -  4000 fpm.

Greetings
Nepo

http://i992.photobucket.com/albums/af50/nepomuk6/condor2.jpg

Nepo

I believe the FL CH is the key to maintaining or loosing speed while descending. I can now setup T/D a lot closer to the destination airport than before when I was using SPD, V/S, and Alt HOLD. I am starting down now between 100 and 115 nm using FL CH compared to 140 to 160 nm from the airport when using the other method. I believe the T/D as computed by the FMC is somewhere between these two profiles. Whatever, I will use VNAV to climb and cruise and FL CH to decsend.

And the speedbrakes are a lot more effective using FL CH.

Thanks
Michael Cubine

You could just let VNAV take care of the whole thing lol.  Program it right and on the HSI you'll see a point that says T/D and you'll automatically start descending with VNAV when you cross that calculated point, providing that you've reset the MCP to your minimum altitude.