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Old 02-12-2018, 11:21 AM   #11
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Quote:
Originally Posted by jcomm View Post
What is the key combination that gives us TAS readings in F2 ( external view ) ?

Ctrl+Z you can switch the Bar between IAS+TAS and different Opitions in the F2 View.
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Old 02-12-2018, 11:32 AM   #12
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^ It's Ctrl-Y (on standard QWERTY keyboard, MAD-MM, you're using QWERTZ layout I presume).

OK, I've got the answer for first half of Hummingbirds problem - the F2 "TAS" is actualy more like a GS (though I recall Yo-Yo's post explainign that it's not really a GS either). The Caucasus free flight mission has some wind added down low (plus a bit of a turbulence when flying REALLY low above sea waves), thus "TAS" readouts are changing depending on your heading - from 520-few to 540-few (!). Clearly for better evaluation, one has to hop into full editor and make a mission with strictly ISA-sea-level-conditions.

No idea about second half of the problem, though. The radiators should not open, at least not that quickly - I flew the plane full boost for 8+ minutes (stopwatch measured)... until I closed fuel cock by mistake by hitting "T" instead of "Y" . Still, even though probably 5+ minutes were with oil at 100 degrees, the rads didn't open (I recall they're controlled strictly by coolant temp anyway) and the engine was running well.
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Last edited by Art-J; 02-12-2018 at 11:34 AM.
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Old 02-12-2018, 01:27 PM   #13
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Ok guys, thx,

will test with CTRL-Y because I have QWERTY

Interesting, if TAS is varying with wind then it's really not a "pure TAS" :-)
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Old 02-12-2018, 01:29 PM   #14
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I use Ctrl + Y for switching between IAS & TAS.

Art-J, I wish I could get the aircraft to run for 8 min at +18 without opening the rads, but I simply can't achieve it for more than 5-10 secs. I'm flying completely smooth and level, everything perfectly trimmed, the aircraft on rails, but I always end up at 515 km/h TAS.
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Old 02-12-2018, 01:45 PM   #15
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Problem solved: Mission was set to 20 deg Celcius, when I put it to 15 deg I could achieve a stabile 532 km/h at SL @ 3,000 rpm +18 boost.

Another issue was discovered I think though, because as I started turning and water temp exceeded 110 deg the rads opened, however when returning to level flight the rads did not close again once temp was below 110 deg. Infact I ran for 5 min at 95 deg water temp with rads fully open. Only way to get them to close again was to throttle down.
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Old 02-12-2018, 02:46 PM   #16
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Now we're getting somewhere. I have no idea, however, at what temp they close on the real thing and thus how the simulated ones should work.
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Old 02-12-2018, 03:03 PM   #17
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Interesting. Would it be the case that the real thing only opened up when the temp was becoming really hot, but at the same way, only closed again when it cooled down sufficiently? I.e. there were two separate regulating temperatures, and in between, the shutters were just "off"...?
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Old 02-12-2018, 06:56 PM   #18
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You'd think it would close the moment the temperature fell below the 110 deg limit, but it didn't, not even when the temperature fell below 95 deg. I had to throttle down for the rads to close, and then oddly enough I could immediately throttle back up to full boost with the rads keeping closed.

Seems abit odd.
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Old 02-13-2018, 08:07 AM   #19
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You would probably have to take a deep look at the control scheme to figure out whether it is correct or not.However, such a system would make sense if the radiator flaps were really just two fixed positions and no intermediate positions like on the 51 or 109. It is a bit crude way to control temp and drag, though.
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Old 02-13-2018, 04:27 PM   #20
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Quote:
Originally Posted by Hummingbird View Post
Problem solved: Mission was set to 20 deg Celcius, when I put it to 15 deg I could achieve a stabile 532 km/h at SL @ 3,000 rpm +18 boost.

Another issue was discovered I think though, because as I started turning and water temp exceeded 110 deg the rads opened, however when returning to level flight the rads did not close again once temp was below 110 deg. Infact I ran for 5 min at 95 deg water temp with rads fully open. Only way to get them to close again was to throttle down.
Check the pilot notes, but I believe the rad was designed to auto open at 115 deg.
In my experience, I find that a few seconds at boost +8 lbs and engine will cool enough for auto operation to close the rad (unless nose too high and speed too low for cooling effect).
Trick is to not fly over 115 deg unless you really need to (perhaps in combat for example); a little under 3,000 rpm may help at times, try 2850 rpm. Pilot notes for most Spits indicate that climb settings are good for combat. Once you have accelerated to speed, climb rpm setting with +18 lbs boost can help with max speed at sea level (yaw and pitch trim, together with minimum movement of stick and control surfaces is essential).
P.S. I am still on 1.5 release version, so have no experience of later versions/patches.

Happy landings,

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