For your approach, at flaps 30 at VREF+5 you should have 1' of pitch, not 4'. Are you sure you have enough power? Fuel flow should be about 3000 pph on each engine on final.  I spent a considerable amount of time to get the pitch correct on final approach and I know it's correct.

I set up a take off with the weight in your scenario and found I needed about 3/4 of the available trim within the green band to rotate at the correct speed, although it did require a considerable amount of elevator. I will look at this issue some more -- the COG and some other variables may need a little more fine tuning.  All my testing in terms of rotation was with considerably heavier weights and higher Vr speeds.

In the meantime just use more trim for rotation.  But this will never be perfect as the trim needs to be set according to a chart based on the percentage MAC you have when the aircraft is loaded. Ideally we would have a utility to show this value after loading the aircraft, but here we have to guess.

I'm not sure what you mean by "full spoilers in flight breaks almost nothing." If you are talking about the drag from the spoilers, I didn't change that from Captain Sim's values and I don't have any data on which to base any change. I don't have any problem slowing the aircraft with the spoilers.

I have a program called ASFD that shows values for many variables -- possibly it can help me with the center of gravity issues. What program are you referring to? I think you are right and that my model could use some improvement in that area. I will produce an update, but it may take a while.

With the spoilers, I just don't have any data to tell me how effective they should be.

Don't worry about your English.  It's a lot better than the French I have been trying to learn for decades now.

No, it isn't needed for the flight model.  Only some of them should come out at flaps 2 -- I'll add that to my revision list.  Thanks for pointing that out.

Sorry you had this problem Joseph. I think something might have gone wrong with your installation.  Sounds like the right airfile didn't end up in the right folder.  Or maybe the cfg file was overwritten in some way after you edited it.  I spent a lot of time tweaking the flap lift so that there would be around 1 to 1.5 degrees of pitch at VREF +5 on a flaps 30 approach.  The mod is only for the 727-100 model.

I checked the download and the correct air file is there.

I wonder as well this could be connected to the different Captain Sim 100 model variants? I have never used the one with winglets or anything other than the basic 100. I should probably look into the question of variants and the operations of the ACE utility.

Michael2 wrote on Jan 18^th, 2010 at 6:50pm:

Hi Michael.

Just a matter curiosity on my behalf. If you don't mind.

How can the different 727-100 models be affected if they are all using the same aircraft.cfg, cs727100.air file and gauges from the panel folder? The only difference that I have found between the 727-100 variants is how the exterior model looks. They certainly don't seem to perform any differently (unless I am blissfully ignorant to any actual differences).

Keep up the good work. You are making a great airplane even greater.

Mark

Michael,

Is it possible, you can give step by step installation guide. I don't want to make any changes in Aircraft.cfg, until I  can follow the  easy step installation guide.
Thanks
Sanal.

Well, having looked at the way the variants work, I think Markoz is right.  All the 100 models share the same air and cfg files and the ACE utility only overwrites the station loads part of the cfg file.

So Joseph, I think something went wrong with your installation of the new air file or your modification of the cfg file.

Asanal, you can easily make a backup copy of your config file in case anything goes wrong.  Then all you need to do is find the lines of text that start the same as the ones in the readme file and replace the orignal with what is in the readme.  For example, to start, you search down the config file to find the line that begins with empty_weight_CG_position followed by some numbers and replace it with what I have in the readme.  If I had any programming ability, I would make an installer, but I am afraid that is completely beyond me.

I will produce an update soon (not sure when exactly) to address the issue with difficult rotation and hopefully provide a COG gauge and take off trim chart.