I've had two of my flights end when the aircraft accelerated too much and was over-stressed. I noticed the speed gain immediately (I think it was caused by a gust of wind when REX was updating), but despite my best attempts, I could not get the aircraft slowed down in time. Because the spoilers cannot be manually deployed, all I could do was cut the throttle and pitch the aircraft up, but I got the "aircraft overstressed" message in just a few seconds. Is there a better way to slow down or at least make the time it takes to over-stress the aircraft longer?

 

Thanks,

boeing247

I would select "ignore Crashes" or whatever it is in the FSX Options menu. That will stop the aircraft overstressed message. To slow down you need to cut back the power and maintain speed with pitch.

 

Bit of advise: slow down then go down. I'd say fly between 165-175 knots. Then descend. If you try to go down at cruise speed, you'll have a hell of a time trying to slow down. She doesn't like that. That should give you an adequate speed margin to fly her down nice and easy.

I agree with "Bank_Angle" in that you need to turn off "ignore crashes".

 

I "lost" this sweet bird a couple of times before I realized that's what was needed. The PMDG J41 seems to have a very narrow margin where it comes to overspeed. Twice I watched as the airspeed only just crept into the red zone and before I could reduce power - BAM ! She broke up. PAX were most unhappy I can tell you. They screamed at me "all the way down" :LMAO:

 

I didn't have REX then, so I can't blame it. But after switching "ignore crashes" to 'off', no more break-ups. Still need to watch the speed of course.

 

Happy flights.

I've had two of my flights end when the aircraft accelerated too much and was over-stressed. I noticed the speed gain immediately (I think it was caused by a gust of wind when REX was updating), but despite my best attempts, I could not get the aircraft slowed down in time. Because the spoilers cannot be manually deployed, all I could do was cut the throttle and pitch the aircraft up, but I got the "aircraft overstressed" message in just a few seconds. Is there a better way to slow down or at least make the time it takes to over-stress the aircraft longer?

 

Thanks,

boeing247

You need to descend alot earlier than normal to give your self the altitude at paf to be at your landing speed this takes some practise to know when you need to descend so give youself another 20 nm extra or so than your normal TOD.

All right, thanks. I think it's the "engine stress causes damage" option. I was hoping there was another solution (I like having that option checked), but it appears that this seems to be a commonly-noted issue. The funny thing is, though, that I never got going too fast during descent--only during cruise. Thanks!

All right, thanks. I think it's the "engine stress causes damage" option. I was hoping there was another solution (I like having that option checked), but it appears that this seems to be a commonly-noted issue. The funny thing is, though, that I never got going too fast during descent--only during cruise. Thanks!

 

In the FSX Realism settings, you want to select "Ignore crashes and damage". That option will not overstress the airframe. "Engine stress causes damage" will damage just the engine if you overstress it.

Although I think an overspeed is considered engine damage. I have crashes turned on but stress/damage off. Never had a problem (unless I actually crash...) But yes, this normally happens during a weather update.

 

I'm assuming you are talking about the J41. If that's the case, then the axiom is "you cannot slow down and go down at the same time." That's not always strictly true, but you certainly can't go down at more than a couple hundred FPM if you are trying to slow down. I will either slow first, drop early, or control VS to get slower descents while slowing airspeed. I'm talking about a 200 FPM-ish rate here. And, it doesn't work with a strong tailwind.

Guys, we're talking about separate issues here.

 

Overspeeding the engine (higher than the max RPM) will cause engine damage.

Overtemping the engine (higher than the max temp) will cause engine damage.

 

Overspeeding the airframe, while it may be caused by one of the above, will damage the airframe and will not necessarily damage the engines. I can cut the engines to idle and dive the plane to overspeed it. The airframe will sustain damage yet the engine will be fine.

 

 

 

As mentioned, this issue is FSX's improper damage model. Select the option ignore crashes and you'll be fine. FSUIPC (registered) can also help this issue in that it can smooth wind. The engine stress option is a PMDG option and is modeled independent of the FSX damage model. I would suggest leaving this on.

Depending on the aircraft here are a few things to keep in mind

 

Turboprop... If you have the option go MAX rpm... then just watch the speed drop off and the way you can drop.. the prop is now acting as a giant speedbrake.

 

Aircraft in general

 

Fly level, get rid of the speed dirty her up (flap and gear) then go down

 

Or keep the speed use it to increase your VS, then once level let it bleed off.

 

Generally it is not a good idea to mix speed reduction along with getting back on profile.

 

But use some or all of the above and you will be fine.

 

Generally compared to a jet a TP can drop like a rock and still make the stable approach gates (by using the props, as i mention above)

 

Dennis

Would it be realistic to put the engines of a turboprop into reverse in midair for a short period of time?

Would it be realistic to put the engines of a turboprop into reverse in midair for a short period of time?

 

No. It's 100% realistic to not use reverse thrust in flight (unless you're flying a DC-8). I don't think the J41 is even capable of reverse thrust in flight.

Okay, didn't think so.

Mot aircraft have a system to prevent selecting reverse inflight... and a specific warning that if you select it inflight - its going to be a VERY bad day!

I believe the inflight reverser warning signal is the sound of the Captain screaming "What the f..."

Would it be realistic to put the engines of a turboprop into reverse in midair for a short period of time?

 

No. See below:

 

I don't think the J41 is even capable of reverse thrust in flight.

 

It's not at all capable.

 

Remember that the JS4100, being a directly geared engine, needs to have constant positive thrust (and is designed to ensure this) in order to not damage the gears. This is why it's such a pain in the ___ to slow down. It's always producing thrust, unlike a Beech 1900 running DOWTY props that can turn into effective air brakes.

 

Geared engines:

+ Instant thrust

- Complex and sensitive

 

Free-spinning:

+ Not as sensitive, can 'disc' the props for nice air brakes

- Thrust lag (similar concept to turbo lag in cars)