Temperature Limits - Page 2 - ED Forums
 


Notices

Reply
 
Thread Tools Display Modes
Old 06-11-2019, 08:32 PM   #11
Cunctator
Member
 
Join Date: Oct 2013
Posts: 225
Default

The adjustable cowl flaps, operated by that hand crank, were only added as an afterthought to more flexibly regulate airflow through the engine compartment. Early Fw 190A models had just fixed gills as exit for the airflow.

The airflow through the oil coolers exits through a small gap between the nose ring and the cowling. The width of this gap could be adjusted on the ground.

For me it looks like the efficiency of the oil coolers could actually increase if you close the cowl flaps with the hand crank. Pressure inside the engine compartment should increase, thus more airflow will be forced through the oil coolers instead of over the engine.
Attached Thumbnails
Click image for larger version

Name:	Luftführung.png
Views:	56
Size:	638.6 KB
ID:	211782  
Cunctator is offline   Reply With Quote
Old 06-11-2019, 08:48 PM   #12
Yo-Yo
ED Team
 
Yo-Yo's Avatar
 
Join Date: Apr 2003
Posts: 14,048
Default

Quote:
Originally Posted by grafspee View Post
oil cooler is in engine's couling ring front. this crank handle in cocpit has anything to do with air flow through this oil coolers ??
The thing is even more complicated, because, regarding the airflow, closed flaps will increase air flow through the oil radiator, but, keeping in mind that heat dumping to oil increases with overall cylinders temperature...
Anyway, the flaps, even closed, leaving enough area for the air to get out, so the temeparure changes are not global.
__________________
Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles.
Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me

Last edited by Yo-Yo; 06-11-2019 at 08:50 PM.
Yo-Yo is offline   Reply With Quote
Old 06-12-2019, 03:37 AM   #13
Nealius
Veteran
 
Join Date: Feb 2013
Location: Tokyo
Posts: 3,449
Default

Max is 85C? I was close to that cruising at between 2100 and 2300rpm with the cowl flaps completely open....on a 24C day. I understand the IAS gauge is currently giving faulty readings, but is the oil temp gauge ok?
__________________
YouTube Channel: "Clutch"

ASUS Z170 | i5-7600 | RTX2070 | 32GB DDR4 | Windows 10
Nealius is offline   Reply With Quote
Old 06-12-2019, 09:03 AM   #14
Yo-Yo
ED Team
 
Yo-Yo's Avatar
 
Join Date: Apr 2003
Posts: 14,048
Default

Quote:
Originally Posted by Nealius View Post
Max is 85C? I was close to that cruising at between 2100 and 2300rpm with the cowl flaps completely open....on a 24C day. I understand the IAS gauge is currently giving faulty readings, but is the oil temp gauge ok?
Just checked: 24C, near SL, 2200 rpm - 76.1 C. Close?
__________________
Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles.
Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
Yo-Yo is offline   Reply With Quote
Old 06-12-2019, 09:37 AM   #15
Nealius
Veteran
 
Join Date: Feb 2013
Location: Tokyo
Posts: 3,449
Default

Reviewing my VR footage now. Fuzzy but you can make out where 50, 100, and the needle are on the oil temp gauge.

Sea level (almost skimming the water), 2300rpm, cooling flaps completely open (setting 5), oil temp is reading 80 or so--possibly 85 given how close it is to 100. Double-checking the weather, it's 26C, 29.92. That 2 degree and 100rpm difference might be doing it? I'll have to fly with your parameters later to see if I get 76 as well.

__________________
YouTube Channel: "Clutch"

ASUS Z170 | i5-7600 | RTX2070 | 32GB DDR4 | Windows 10
Nealius is offline   Reply With Quote
Old 06-12-2019, 02:03 PM   #16
MadCat1381
Junior Member
 
Join Date: Apr 2019
Location: Germany
Posts: 40
Default

This temp gauge is quiete confusing.
There is a green line at about 20-30°C, okay, maybe minimum Temp.
Then there is a green line at about 70°C.

Next line is red at 85°C.
These are painted on.


Then there are two white markings at 35-40°C and 95°C.
And the normal scale is marked with fat white lines at 0, 50, 110 and 130.


The manual says at page 59: "Two indicator strips indicate normal operating temperature of 110 - 130°C." and later under "Normal procedures" Page 99: "Attention! It is recommended to open the radiator cooling flaps at a temperature of 110°С."


So what is correct now?
MadCat1381 is offline   Reply With Quote
Old 06-12-2019, 02:20 PM   #17
fencible
Junior Member
 
Join Date: Mar 2015
Location: Ontario, Canada
Posts: 72
Default

Quote:
Originally Posted by Nealius View Post
Max is 85C? I was close to that cruising at between 2100 and 2300rpm with the cowl flaps completely open....on a 24C day. I understand the IAS gauge is currently giving faulty readings, but is the oil temp gauge ok?
It says 110 C in the manual, which is worth reading.
fencible is offline   Reply With Quote
Old 06-12-2019, 02:22 PM   #18
saburo_cz
Member
 
saburo_cz's Avatar
 
Join Date: Sep 2013
Location: Prague CZ
Posts: 654
Default

Too many parts in A-8 manual is simply "copy" from D-9 manual..
Unfortunately this part is one of them.

At this moment, A-8 manual is more likely confusing than helpful.
__________________
saburo_cz is offline   Reply With Quote
Old 06-12-2019, 04:59 PM   #19
Yo-Yo
ED Team
 
Yo-Yo's Avatar
 
Join Date: Apr 2003
Posts: 14,048
Default

26 C, 2400/1.32 - 79 at level flight, 88C was encountered only at the end of climb at high altitudes (7-8k). Flaps open. Few minutes of excessive 2-3 C means nothing.
__________________
Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles.
Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
Yo-Yo is offline   Reply With Quote
Old 06-23-2019, 10:35 PM   #20
Harry_Haller
Junior Member
 
Join Date: Jun 2019
Posts: 3
Default

I've flown around max throttle for maybe like 20 min. Nothing happens. Anyone managed to overheat, blow engine? How long did it take? Special circumstances?
Harry_Haller is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT. The time now is 05:42 AM. vBulletin Skin by ForumMonkeys. Powered by vBulletin®.
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.