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Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Reverse Thrust
- Thread starter Reddog
- Start date
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That's what I have and it doesn't move backwards.
Weird, just tried and even at MTOW she moves backwards. Looks like a throttle calibration issue and you don't get full reverse thrust.
Check with the tooltips enabled. At max reverse the throttle tooltip should read 'reverse 30%'
R U using SP2 or Accel ? The new FDE has been tested only with Acceleration....
Check with the tooltips enabled. At max reverse the throttle tooltip should read 'reverse 30%'
R U using SP2 or Accel ? The new FDE has been tested only with Acceleration....
using SP1 and SP2, no accl. thottle tooltip says that. checked other turboprops with reverse and they all work.
Then it's most probably that you don't have acceleration installed as this definitely improves engine/prop behaviour.
What you can do is to increase the reverse thrust in the cfg file.
[GeneralEngineData]m
min_throttle_limit = -0.30
Just increase the min_throttle_limit up to -100%
BTW, reverse does work but it doesn't necessarily means that you can taxi backwards...
thunder100
Charter Member 2010
A big trigger of Reverse trust on Prop's is here
[propeller]
fixed_pitch_beta = 0
low_speed_theory_limit = 80
prop_sync_available = 0
prop_deice_available = 1
prop_feathering_available= 1
prop_auto_feathering_available= 1
min_rpm_for_feather = 400
beta_feather = 88
power_absorbed_cf = 1
defeathering_accumulators_available= 0
prop_reverse_available = 1
minimum_on_ground_beta = 15
minimum_reverse_beta = -15
But be careful with it can have odd other effects
Roland
[propeller]
fixed_pitch_beta = 0
low_speed_theory_limit = 80
prop_sync_available = 0
prop_deice_available = 1
prop_feathering_available= 1
prop_auto_feathering_available= 1
min_rpm_for_feather = 400
beta_feather = 88
power_absorbed_cf = 1
defeathering_accumulators_available= 0
prop_reverse_available = 1
minimum_on_ground_beta = 15
minimum_reverse_beta = -15
But be careful with it can have odd other effects
Roland
Not really, as the advance ratio is extremely low at that speed and hence the effectiveness very low regardless of the blade angle.
Especially with the new 208 FDE which has a completely new and much more realistic prop.
I know, it does work in slowing the a/c down on landing. Will try your suggestion.
BTW, does Static Thrust have anything to do with it?? The reason I ask is that on my other a/c that do work the ST= is a lot higher than on your 208.
ST is realistic, but works in the opposite direction (when talking about moving backwards), so increasing ST would actually counter reverse thrust created by the prop.
Use number shown below and she will back up very nicely using F2 key:
prop_reverse_available = 3 //1 unfortunately MS does not always remark some of their parameters accurately
the higher this number the faster she will back up. if you have a rudder control you will be able to steer her R/L backwards. use F1 to disengage. be careful using brakes when backing up she will end up on her tail.
prop_reverse_available = 3 //1 unfortunately MS does not always remark some of their parameters accurately
the higher this number the faster she will back up. if you have a rudder control you will be able to steer her R/L backwards. use F1 to disengage. be careful using brakes when backing up she will end up on her tail.
That did it works now. Thanks for that tip.
No Wind
Trouble is that any wind, even 5 kts, will 'hold' the ac where it won't move in reverse sometimes. The solution lies in the amount of 'maximum_torque' available.
[turboprop_engine]
maximum_torque= 15900.000 //orig=10614.000 //Max torque available (ft-lbs)
THIS is where you control how effective the reverse thrust is going to be (to overcome wind, uphill climb, cnt pt drag, etc). The line above is the 'important' one as far as how MUCH reverse thrust you are going to get (thus 'overcome' wind, etc). Try it and see. It's NOT the 'static thrust'. Static thrust can be -99999.000. No matter.
Other Tips:
*Adjust the 'maximum_torque=x' value until you get ac to move easily at the above 'min_throttle_limit' value (in (General_Engine) section-usually '-0.14' but can be as much as '-0.39' or so). It's all easier if you have a gauge that shows % of power (throttle) to 'see' 'min_throttle_limit'. Using F3 to reduce amount of 'min_throttle_limit' will allow some 'control' of how fast ac moves. When torque is too much you can reduce the min throttle limit (trial & error). Play one against the other. Every model is different.
*When you are in reverse thrust and press F1 you will jump forward 30 ft with Turbo-Props especially. To prevent this, press F3 (2 times), F2 (2 times), back & forth, about 3 times and ac will not jump.
*To prevent tail strike due to brake while moving in reverse, make sure that the value of 'empty_weight_CG_position' is at least +1 more than 'reference_datum_position' value (it's longitudial value). This can be +2, or +3 more. Trial & error will determine which value works best. At any rate, this is where you adjust for no tail strike due to braking when moving back in reverse thrust. Not cnt pts or moving engines or fuel tanks. OK? OK! Happy reverse in FSX to you all.
Chuck B
Napamule
Trouble is that any wind, even 5 kts, will 'hold' the ac where it won't move in reverse sometimes. The solution lies in the amount of 'maximum_torque' available.
[turboprop_engine]
maximum_torque= 15900.000 //orig=10614.000 //Max torque available (ft-lbs)
THIS is where you control how effective the reverse thrust is going to be (to overcome wind, uphill climb, cnt pt drag, etc). The line above is the 'important' one as far as how MUCH reverse thrust you are going to get (thus 'overcome' wind, etc). Try it and see. It's NOT the 'static thrust'. Static thrust can be -99999.000. No matter.
Other Tips:
*Adjust the 'maximum_torque=x' value until you get ac to move easily at the above 'min_throttle_limit' value (in (General_Engine) section-usually '-0.14' but can be as much as '-0.39' or so). It's all easier if you have a gauge that shows % of power (throttle) to 'see' 'min_throttle_limit'. Using F3 to reduce amount of 'min_throttle_limit' will allow some 'control' of how fast ac moves. When torque is too much you can reduce the min throttle limit (trial & error). Play one against the other. Every model is different.
*When you are in reverse thrust and press F1 you will jump forward 30 ft with Turbo-Props especially. To prevent this, press F3 (2 times), F2 (2 times), back & forth, about 3 times and ac will not jump.
*To prevent tail strike due to brake while moving in reverse, make sure that the value of 'empty_weight_CG_position' is at least +1 more than 'reference_datum_position' value (it's longitudial value). This can be +2, or +3 more. Trial & error will determine which value works best. At any rate, this is where you adjust for no tail strike due to braking when moving back in reverse thrust. Not cnt pts or moving engines or fuel tanks. OK? OK! Happy reverse in FSX to you all.
Chuck B
Napamule
Positively Yes
mal998,
You are right. It will prevent the backwards tip on brake when moving in reverse. A '+1' value increase, per se (ie: on it's own), is not going to RUIN the dynamics/handling. That is not possible.
And while we are disgusting things: what happens if I enter: 'prop_reverse_available= -1' ? Have you tried it? How about a value of '-3'? Have you tried that? Quote: ' // unfortunately MS does not always remark some of their parameters accurately'. They also did not run any 'trial & error' tests for values other than 1 or 3? I did.
Chuck B
Napamule
mal998,
You are right. It will prevent the backwards tip on brake when moving in reverse. A '+1' value increase, per se (ie: on it's own), is not going to RUIN the dynamics/handling. That is not possible.
And while we are disgusting things: what happens if I enter: 'prop_reverse_available= -1' ? Have you tried it? How about a value of '-3'? Have you tried that? Quote: ' // unfortunately MS does not always remark some of their parameters accurately'. They also did not run any 'trial & error' tests for values other than 1 or 3? I did.
Chuck B
Napamule
1. If you increase mx torque you not only change reverse thrust but forward thrust as well, totally ruining the performance going backward and forward.
2. Why do you want to prevent a tail strike when moving in reverse? That's exactly what happens IRL as well
BTW, altering the CG by 1ft or more seriously affects handling!
Could 'a Would 'a
Quote:'It COULD effect handling'. A strong wind could do the same. What I suspect 'happened' is that you inherited a set of lousy FDE's and ANY change anywhere COULD (of course) be 'blamed' for ruining the handling. It's just so easy to ASSUME things are a certain way, and set in concrete, because 'that's the way it's always been...'. Or, was 'made up' to apease the crowds. Like the nose up attitude. The horiz stab incidense does more to effect THAT than the CofG ever (EVER!!) will. But I am talking to the hand I imagine. Cheesh.
This is why I hate to discuss flight dynamics because there is always one or two that will argue all day about something that does not apply to flight simulator at all (although it DOES apply to 'real' flying). 1 ft change to CofG does NOT ruin your handling IN FLIGHT SIMULATOR. A bad set of FDEs (dynamics) WILL ruin your handling. Don't mix them up. And don't cite real dyanmic parameters to 'apply' in flight simulator. It just don't work that way. Flt Sim is DIFFERENT to real. Even flying ac in sim is different. OK? OK! So don't change anything. Leave your FDEs the way they are. Fly like you alway fly. Rely on the modeler to provide you with instructions ('how to fly') in the 'ReadMe' txt file. Right? Right. And ck the various forums for 'no reverse thrust', 'bounce on landing', 'shaking sitting on runway', 'tip over on tail on brake when in reverse', 'airplane won't turn on taxi', etc, etc. It's all there. Over and over. Same ole questions. Again and again. Something has GOT to change, I do believe. But, minds are hard to change. That I know.
Chuck B
Napamule
Quote:'It COULD effect handling'. A strong wind could do the same. What I suspect 'happened' is that you inherited a set of lousy FDE's and ANY change anywhere COULD (of course) be 'blamed' for ruining the handling. It's just so easy to ASSUME things are a certain way, and set in concrete, because 'that's the way it's always been...'. Or, was 'made up' to apease the crowds. Like the nose up attitude. The horiz stab incidense does more to effect THAT than the CofG ever (EVER!!) will. But I am talking to the hand I imagine. Cheesh.
This is why I hate to discuss flight dynamics because there is always one or two that will argue all day about something that does not apply to flight simulator at all (although it DOES apply to 'real' flying). 1 ft change to CofG does NOT ruin your handling IN FLIGHT SIMULATOR. A bad set of FDEs (dynamics) WILL ruin your handling. Don't mix them up. And don't cite real dyanmic parameters to 'apply' in flight simulator. It just don't work that way. Flt Sim is DIFFERENT to real. Even flying ac in sim is different. OK? OK! So don't change anything. Leave your FDEs the way they are. Fly like you alway fly. Rely on the modeler to provide you with instructions ('how to fly') in the 'ReadMe' txt file. Right? Right. And ck the various forums for 'no reverse thrust', 'bounce on landing', 'shaking sitting on runway', 'tip over on tail on brake when in reverse', 'airplane won't turn on taxi', etc, etc. It's all there. Over and over. Same ole questions. Again and again. Something has GOT to change, I do believe. But, minds are hard to change. That I know.
Chuck B
Napamule
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