Strange phenomenan with light acft.

[fgehl]

Hello

 

First of all HAPPY NEW YEAR.

 

I have a strange problem in Prepar3d v3.3.5.

When i'm flying with the Caranedo Bonanza it suddenly drops in speed in mid-air.

When i change to the Mooney for a min of 2 good speed and then it drops as well.

When i go back to the Bonanza 2 mins ok and then it drops again.e.s.o.

What is going on here fuel enough.

 

 

Frans

[lnuss]

Let's try a bit more detail, since "drops in speed" doesn't mean much (to me, anyhow). Are you looking at the airspeed indicator, the groundspeed readout (perhaps on the GPS), or maybe just looking out the window? Is it instantaneous or does it take a few seconds or a minute or two?

 

Does it stay slow or does it speed up again, perhaps after a few seconds or a minute or two? Are you avoiding the "r" key (I'm thinking of changing the time rate)? Does this happen at all altitudes, or perhaps at just one or a small range of altitudes? What are the winds aloft set to?

 

And what speed are you talking about on the Bonanza, for example, both before the "drop in speed" and after the " drop in speed?"

 

What these questions I'm asking are trying to do is to give us enough information that maybe we can understand what you're seeing well enough to maybe provide an answer to you.

[fgehl]

Let's try a bit more detail, since "drops in speed" doesn't mean much (to me, anyhow). Are you looking at the airspeed indicator, the groundspeed readout (perhaps on the GPS), or maybe just looking out the window? Is it instantaneous or does it take a few seconds or a minute or two?

 

Does it stay slow or does it speed up again, perhaps after a few seconds or a minute or two? Are you avoiding the "r" key (I'm thinking of changing the time rate)? Does this happen at all altitudes, or perhaps at just one or a small range of altitudes? What are the winds aloft set to?

 

And what speed are you talking about on the Bonanza, for example, both before the "drop in speed" and after the " drop in speed?"

 

What these questions I'm asking are trying to do is to give us enough information that maybe we can understand what you're seeing well enough to maybe provide an answer to you.

 

Wauw that are a lot of ques.

I mean i have an IAS of 160 with the Bonanza and suddenly it drops to 70kts in a slow way.

Tailwind of 40 kts.

And the altitude is 3500 ft AGL.

And indeed the gear up lights up so when.i lower the gear and pull it up again the speed increases.

I had a normal speed rate of Prepar3d.

The strange thing is that when i have a speed of 60kts and change to another acft it starts immediately with 160kts and then after a few mins it dropped as well.

[PhantomTweak]

Have you tried turning the pitot heat on?

Could it be that you airspeed indicator is having a problem with the pitot tube icing up, causing the speed seem to drop?

Could you be passing through a sudden wind shift? 40kt tail wind suddenly? A gust maybe?

Just a thought. I get so very few.

Pat☺

[lnuss]

Wauw that are a lot of ques.

Yes, because I can't see what's happening there, nor can I read your mind nor see a log file with the info. Troubleshooting needs information, and you have to supply that. I don't share your problems, even with the Carenado Bonanza, which I have, so you have to feed me information about what you are seeing.

 

And indeed the gear up lights up

Is that the gear warning that you're talking about? That usually comes on because the power setting is so low, meaning you need to add throttle. And are you saying that the speed goes up again just from cycling the gear and doing nothing else?

 

And the altitude is 3500 ft AGL.

Actually, I'm looking for MSL (Mean Sea Level), not AGL. The thinner at air higher altitudes MSL can affect aircraft operation. So that 3500 AGL could be 3600 feet MSL if the ground elevation is 100 feet, but could also be 11,000 feet MSL if ground elevation is 7,500 feet.

 

I mean i have an IAS of 160 with the Bonanza and suddenly it drops to 70kts in a slow way.

I am presuming you are maintaining a constant altitude during this (or nearly so), rather than a sharp climb. And that your throttle (and prop, and mixture) setting is constant at, say, 65% or 75% power (say 2500 RPM and 25" MP, or Manifold Pressure).

 

Tailwind of 40 kts.

That is only relevant if you're reading groundspeed rather than IAS, IF the windspeed is constant throughout the flight (at least the part where the slowdown occurs). But if there were large wind gusts changing things -- perhaps as you changed altitude the winds also changed -- then that could account for the change. Doesn't sound as if that's the case, from what you say.

 

So far I don't see anything that would cause your problem, but I was hoping that we'd find you were climbing, losing power (perhaps to induction icing), nudging the throttle to a lower setting, mixture too rich (or lean) for the altitude, or something else that would be readily identifiable, but if you're in level flight with a constant altitude (perhaps using the autopilot) with the engine properly leaned (or with auto-mixture turned on) and a constant power setting and a constant wind (or no wind) and without carb (induction) icing, I'm not quite sure what to tell you.

 

Pardon the additional questions, but I'm trying to be certain that I understand what you are saying. Miscommunication would lead me astray.

 

Addendum: Pat has an excellent question about the pitot heat -- I forgot to mention that.

[fgehl]

Have you tried turning the pitot heat on?

Could it be that you airspeed indicator is having a problem with the pitot tube icing up, causing the speed seem to drop?

Could you be passing through a sudden wind shift? 40kt tail wind suddenly? A gust maybe?

Just a thought. I get so very few.

Pat☺

 

Hello

 

Yeah pitot heat was on.

The strange thing though is i didn't had it before.

Just since 2 days.

 

Frans

[mallcott]

IAS properly set in sim settings?

 

Could be icing.

[fgehl]

Yes, because I can't see what's happening there, nor can I read your mind nor see a log file with the info. Troubleshooting needs information, and you have to supply that. I don't share your problems, even with the Carenado Bonanza, which I have, so you have to feed me information about what you are seeing.

 

 

Is that the gear warning that you're talking about? That usually comes on because the power setting is so low, meaning you need to add throttle. And are you saying that the speed goes up again just from cycling the gear and doing nothing else?

 

 

Actually, I'm looking for MSL (Mean Sea Level), not AGL. The thinner at air higher altitudes MSL can affect aircraft operation. So that 3500 AGL could be 3600 feet MSL if the ground elevation is 100 feet, but could also be 11,000 feet MSL if ground elevation is 7,500 feet.

 

 

I am presuming you are maintaining a constant altitude during this (or nearly so), rather than a sharp climb. And that your throttle (and prop, and mixture) setting is constant at, say, 65% or 75% power (say 2500 RPM and 25" MP, or Manifold Pressure).

 

 

That is only relevant if you're reading groundspeed rather than IAS, IF the windspeed is constant throughout the flight (at least the part where the slowdown occurs). But if there were large wind gusts changing things -- perhaps as you changed altitude the winds also changed -- then that could account for the change. Doesn't sound as if that's the case, from what you say.

 

So far I don't see anything that would cause your problem, but I was hoping that we'd find you were climbing, losing power (perhaps to induction icing), nudging the throttle to a lower setting, mixture too rich (or lean) for the altitude, or something else that would be readily identifiable, but if you're in level flight with a constant altitude (perhaps using the autopilot) with the engine properly leaned (or with auto-mixture turned on) and a constant power setting and a constant wind (or no wind) and without carb (induction) icing, I'm not quite sure what to tell you.

 

Pardon the additional questions, but I'm trying to be certain that I understand what you are saying. Miscommunication would lead me astray.

 

Addendum: Pat has an excellent question about the pitot heat -- I forgot to mention that.

 

Hello

 

Did the same flt today and everything worked fine.

So i don't know what's going on.