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List: flightgear-devel
Subject: Re: [Flightgear-devel] Bug with static / pitot pressure
From: Jonathan R <legoboyvdlp () gmail ! com>
Date: 2019-02-28 12:21:00
Message-ID: CAJRHk2+7jNKU6sdR_EGkwr6Jqhk6R7r5qKavZJDOfM0uynAdNg () mail ! gmail ! com
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He tells me that he is using 2018.3.2, so it could quite likely be that
commit.
I tested myself on a compiled next and saw the same thing:
https://pastebin.com/QCWK9WTh
A setlistener on the pitot pressure reported its first value
as: 42.43544514955825
So I imagine a high pitot pressure would cause the airspeed indicator to
behave like that.
I wonder is pitot pressure so high because FlightGear starts at -9999 feet?
Jonathan
On Thu, Feb 28, 2019 at 9:06 AM James Turner <james@flightgear.org> wrote:
>
>
> On 27 Feb 2019, at 14:35, Jonathan R <legoboyvdlp@gmail.com> wrote:
>
> " I put a listener to
> "/instrumentation/airspeed-indicator/indicated-speed-kt" in both the ufo
> and the A320, both show that initially the IAS start a a relatively high
> value (more than 25 kts), raise continuously (to almost 80 kts) and then
> fall back to almost zero. A listener for "/environment/wind-speed-kt " does
> not mirror this, it just stays around the wind speed in metar (some 4 kts).
> So something īs odd with FG īs initial IAS calculation...
> "
>
>
> Okay, sounds like some of the filters in the airspeed instrument are
> taking a long time to settle, and the spike is very weird.
>
> Is this a new / recent problem? Because, I did change a couple of
> instruments recently to deal with NaNs / nearly-zero-pressure in space, I
> don't *think* it should cause this but if this is a recent bug (in the last
> two months) it's the most likely explanation.
>
> Kind regards,
> James
>
> _______________________________________________
> Flightgear-devel mailing list
> Flightgear-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/flightgear-devel
>
[Attachment #5 (text/html)]
<div dir="ltr"><div dir="ltr"><div dir="ltr">He tells me that he is using 2018.3.2, \
so it could quite likely be that commit.<div>I tested myself on a compiled next and \
saw the same thing:</div><div><a \
href="https://pastebin.com/QCWK9WTh">https://pastebin.com/QCWK9WTh</a><br></div><div><br></div><div>A \
setlistener on the pitot pressure reported its first value as: \
42.43544514955825</div><div>So I imagine a high pitot pressure would cause the \
airspeed indicator to behave like that.</div><div>I wonder is pitot pressure so high \
because FlightGear starts at -9999 \
feet?</div><div><div>Jonathan</div></div></div></div></div><br><div \
class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 28, 2019 at 9:06 AM \
James Turner <<a href="mailto:james@flightgear.org">james@flightgear.org</a>> \
wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div \
style="overflow-wrap: break-word;"><br><div><br><blockquote type="cite"><div>On 27 \
Feb 2019, at 14:35, Jonathan R <<a href="mailto:legoboyvdlp@gmail.com" \
target="_blank">legoboyvdlp@gmail.com</a>> wrote:</div><br \
class="gmail-m_-112742458016899199Apple-interchange-newline"><div><div \
style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal \
;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none">" \
I put a listener to "/instrumentation/airspeed-indicator/indicated-speed-kt" \
in both the ufo and the A320, both show that initially the IAS start a a relatively \
high value (more than 25 kts), raise continuously (to almost 80 kts) and then fall \
back to almost zero. A listener for "/environment/wind-speed-kt " does not \
mirror this, it just stays around the wind speed in metar (some 4 kts).</div><div \
style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal \
;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none">So \
something īs odd with FG īs initial IAS calculation...</div><div \
style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal \
;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transf \
orm:none;white-space:normal;word-spacing:0px;text-decoration:none">"</div></div></blockquote></div><br><div>Okay, \
sounds like some of the filters in the airspeed instrument are taking a long time to \
settle, and the spike is very weird.</div><div><br></div><div>Is this a new / recent \
problem? Because, I did change a couple of instruments recently to deal with NaNs / \
nearly-zero-pressure in space, I don't *think* it should cause this but if this is a \
recent bug (in the last two months) it's the most likely \
explanation.</div><div><br></div><div>Kind \
regards,</div><div>James</div><div><br></div></div>_______________________________________________<br>
Flightgear-devel mailing list<br>
<a href="mailto:Flightgear-devel@lists.sourceforge.net" \
target="_blank">Flightgear-devel@lists.sourceforge.net</a><br> <a \
href="https://lists.sourceforge.net/lists/listinfo/flightgear-devel" rel="noreferrer" \
target="_blank">https://lists.sourceforge.net/lists/listinfo/flightgear-devel</a><br> \
</blockquote></div>
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