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Aircraft refuses to take off

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EHM-0441 Stefan:
I tried 4 times and I might have forgotten the flaps the last time there when I recorded but I know I had flaps down the first tries because well first of all I allways start with flaps as thats the way you do it. Might be that the replay didnt show too because well the replay in FS9 is abit weird to say the least. But I'm certain I've done it with flaps and tbh I think we can agree it shouldnt have a problem taking off from that airfield. I can lift off with a boeing 777 from meigs filed chicago and that runway cant be much longer... :P I've tried all big planes there :D I used to fly there all the time before I joined EHM :)

EHM-0441 Stefan:
Hum maybe its not suppose to make a 4,7k runway. I'm doing some research now and it seems a C850 need 6,295 ft runway. Hope there are a bigger runway then so I can fly back to sweden else I'd have to file a report that... that flight isnt for a Challenger 850 if no runway can handle it for takeoff.. ;) but I'm sure there are a longer runway else it would be very bad airport.. :O   


http://lightjetage.com/Spec-sheet/Bombardier-Challenger-850.html

NOTE: According to my "research" BIRK is not suitable for this aircraft, even on the longest runway on that airport its 1100 ft too short for the Callenger 850 to make a safe takeoff.

EHM-0441 Stefan:
I made a take off now, just very barely.

Parking breaks.
Full flaps.
Full throttle.
And release on clearence.
I just barely got above the buildings and trees.

Another annoying thing is that when I put the autopilot on for it to start climbing it points nose straight down, why? Its as if it doesnt put it to a positive vertical speed when I do it. It should... and I have to fight hard to get it to start a climb, have happened on many aircrafts.

EDIT: I just noticed another thing, this time I had only 15% fuel so maybe thats why I managed to take off this time.. :(

EHM-2198 Didimo:
Could be a  number of factors but that another type of a/c took off fully loaded is not a good reference. For one thing some models out there are real others are kind of idealized. Would be nice if you say which a/c it is :)

In any case you have to make sure:
1. I don't think full flaps is a take off configuration. Usually you are about 1/3 or something like that. Flaps are a double edge sword, they are for low speeds but as you take off speed is building up and too much flaps can give you too much friction.

2. Did you check your CG (Center of Gravity)? Adjust your fuel and load accordingly.

3. Was your total weight exceeding your MTOW (Maximum Take Off Weight) ? if so go to (2) and decrease it. You have to trade off fuel for cargo. By rule around 30% extra is usually loaded as extra fuel. However, some FS aircraft consume a LOT more than what the flight planner tells you. You don't want to run off fuel in mid air. If it is an EHM a/c I suggest you look up the flight stats of that same flight/route with that particular a/c and see what was the consumption trend, use the maximum + margin as your minimum fuel load.

4. Brakes? on jets don't forget to use the RTO (Reject Take Off) auto-brakes setting.

5. Did you accidentally deploy air brakes? if it was a prop a/c were you autofeathering?

6. Is the runway length enough for your type of a/c?

7. Airfield altitude affects the amount of runway an a/c uses for take off. Not all a/c can take off from high altitude airfields.

8. Was your power setting correct? Some a/c even when you do full throttle give you less than that (internal logic), in such cases use the F4  or the AP command button override.


AFAIK it is not a good idea to take off on autopilot. However, you should set your auto pilot (speed, heading, course, initial climb and possibly V/S if not automatically computed) while on the ground but take off and do initial climb manually. You may want to gradually engage autopilot functions or just do the whole thing manually.

EHM-0441 Stefan:
I do say wich it is, but my posts are a mess lol so I dont blame ya.. :P

Anyway, its the bombardier Challenger 850.. :D

Well, I found out from real spec:es on the a/c that it need 6200 ft of runway... thats what what the specifications says for that aircraft. And the runway I had problems on was only 4800 ft give or take a few ft. But as I could get the boeing 747 off that runway and the emberer 170 with no problem at all I think its strange.

But what bugs me the most is that it crashed on arlanda on that 10000+ ft runway and wouldnt take off and just got to such speed it became unstable and flipped on its roof.

It could be trim settings left at odd position from previous flight that I never realy checked.

God I've realy made a big deal out of this lol.. like done 15 posts on this silly subject xD

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