The British ASI

[bolox]

IvanK, thank you very much for your input, agrees totally with my limited experience of flying relevant types (Chipmunk and Harvard).

The last thing i wish to do is cause a 'war' over this (or any other issue) and further overload Ilya and the team, however at the very least it is inconsistent with the behaviour of other nations asi's.

anyway for those who want to know a little more how pitot systems work and their errors maybe of interest
http://www.nar-associates.com/techni...ide_screen.pdf
or for the more technical
http://ntrs.nasa.gov/archive/nasa/ca...1993092348.pdf

[Ataros]

Reopened the issue.

[bolox]

some 'evidence'


taken from (fig
http://jsbsim.sourceforge.net/spit_flying.pdf

note it is for a Va but it is a fully instrumented test.
a quick try at replicating these conditions ingame ( SpitIIa 210 IAS trimmed level flight, 2650rpm estimated 2G pull) gives a drop in IAS to ~165mph and ~200 on release. To me that is a huge difference- infact the chart shows a very slight increase in IAS at pull

The graphs of timed 180 turn also fail to show any noticeable corellation between sideslip and IAS, certainly not the ~30mph difference experienced ingame.

Is this sufficient proof to put to Luthier? or are there any errors that anyone can spot that need to be addressed?

[IvanK]

Thanks for reopening the Bug on the tracker site Ataros

Good reference there BOLOX.

[Osprey]

Yes this is a big annoyance and one of the main reasons the 109 can just go vertical to live. Tactically, that aside, can someone please explain how to vote for a bug please? I see lots have done it but I must be dim because I can't work it out.

[41Sqn_Banks]

Originally Posted by Osprey

Yes this is a big annoyance and one of the main reasons the 109 can just go vertical to live. Tactically, that aside, can someone please explain how to vote for a bug please? I see lots have done it but I must be dim because I can't work it out.

As far as I understand it's only a instrument error and doesn't effect the actual air speed.

[IvanK]

Originally Posted by 41Sqn_Banks

As far as I understand it's only a instrument error and doesn't effect the actual air speed.

Agreed its an instrument display indication bug. Actual IAS is not changing So FM wise it has no impact.

[albx]

Originally Posted by Osprey

Yes this is a big annoyance and one of the main reasons the 109 can just go vertical to live. Tactically, that aside, can someone please explain how to vote for a bug please? I see lots have done it but I must be dim because I can't work it out.

go here http://www.il2bugtracker.com/issues/2 if you are logged in then click the green arrow next to Votes...

[Osprey]

Thanks mate, I hadn't registered, it was obvious really..........D'oh!