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Simviation Forum › Current Flight Simulator Series › Flight School › cowl Flaps and Winglets

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cowl Flaps and Winglets (Read 781 times)

May 24^th, 2004 at 3:30pm

atotti2000 Offline
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Heres...Joey!
Newcastle, UK

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wat do they do? ??? Roll Eyes

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Reply #1 - May 24^th, 2004 at 3:32pm

Craig. Offline
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Birmingham

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winglets are used to stop the flow of air running off the tips of the wings which creates more drag and effectivly makes the wings less efficient. or at least i believe thats correct.

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Reply #2 - May 24^th, 2004 at 5:57pm

Nexus Offline
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The greater of two evils...

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Cowl flaps, are doors that regulates the cooling of the engine (not used on modern jets)
When more cooling air is needed you'll open the cowl flaps

Winglets are - like Craig said - drag reducing, thus also fuel saving.
But the winglets also increase the overall spread of the trailing egde vortices, creating more lift at the wingtips.

Quoted from Boeing Aero Magazine

"* Creates more efficient flight characteristics in cruise and during take off and landing
* Approx 4% increase in range (130nm for the 737-800)but you must be at LRC or OPT altitude"

LRC stands for Long Range Cruise and is available in the FMC's CRZ page.

As you can see, winglets are no use for short flights.

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Reply #3 - May 25^th, 2004 at 10:27am

atotti2000 Offline
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Heres...Joey!
Newcastle, UK

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Thanks guys. i knew they were there, just didnt know what to do with them

thankyou:D

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Reply #4 - May 25^th, 2004 at 1:20pm

Ivan Offline
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No, I'm NOT Russian, I
only like Russian aircraft
The netherlands

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Cowl flaps have another funcrtion, depending on the contrruction...

Keeping the snow out of the engine cowling (Li-2, Il-12/14)

Russian planes: IL-76 (all standard length ones), Tu-154 and Il-62, Tu-134 and An-24RV&&&&AI flightplans and repaints can be found here

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Reply #5 - Jun 25^th, 2005 at 3:12am

Skligmund Offline
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Piper PA-31T3 T1040
Anchorage, Alaska

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Winglets are actually efficient enough that they work as well as extending the wings the same lenght as the winglet itself. Really neat trick.

MSI K8N Neo2 Platinum&&Athlon64 3700+ San Diego (2200) @ 2750 MHz&&1024MB PC3200 @ 500 MHz (Mushkin V2)&&GeForce 6800GT OC (BFG)&&(2) 80G SATA Seagates RAID0&&(1) Maxtor 250Gb 16MB Cache ATA133&&19

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Reply #6 - Jun 27^th, 2005 at 11:40am

beaky Offline
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Uhhhh.... yup!
Newark, NJ USA

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Yeah, I've heard of this: Vertical wing surfaces do in fact provide some lift. Which will of course create drag, so... ouch.
Flying airplanes is definitely more fun than designing them... Grin

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