Embraer Question

Baronman · December 8th, 2003, 18:23

I flew on an Embraer 145 about 2 weeks ago and noticed some "strakes" on the oatboard leading edge of the wing. I counted 3 or 4 of them, all equal in length extending about 12 inches out.

The aircraft doesn't have leading edge devices so that takes out the possiblity of them being some sort of rails or hinges. Can anyone identify them?

aloft · December 8th, 2003, 18:56

Stall fences? Vortex generators?

FalconCapt · December 8th, 2003, 19:01

Aloft is probably right... Were they above or below the wing? Most likely a device to tame the stall characteristics for certification.

Joe · December 8th, 2003, 22:31

Do you mean those yellow pointy thigns hanging under the wing?

Doug Taylor · December 8th, 2003, 23:08

vortilons.

If you need more info, one of my croanies is an Emb-145 CA for COex (displaced from mainline as a 737 FO at Continental).

sorrygottarunway · December 9th, 2003, 07:40

yeah that would be cool...

I've always been curious about the ERJ vs CRJ competition... ERJ "looks" faster, max cruise of 450kts, the CRJ-200 (also 50 seater) has a high cruise of 464kts... ok, I guess thats not much of a difference. But I always wonder how the regionals make that key decision between two aircraft with almost the same performance.

And yeah, what the heck are those yellow slits. If they were stall fences, would they not have to be above the wing? Does this have something to do with (I cringe to say this again) "swept-wing design" where at certain speed, airflow is not over but laterally down the wing?

Or maybe its just a place for the capt. to hang his coats...

FalconCapt · December 9th, 2003, 07:55

"Another interesting aerodynamic change from earlier modes of the B-767 is the addition of three vortilons under the leading edge of the outboard slats. During stall testing, Boeing found that stick forces were getting light near the stall, and that uncommanded roll at the stall would produce up to a 20-degree bank. Both characteristics were within certification tolerance, but with the addition of the vortilons, the flow separation problem near the stall was eliminated. [b]Vortilons, found on aircraft from the LongEze homebuilt to the EMB-135/145, and now the B-767-400ER, can energize the airflow just enough to eliminate a potential problem."[b]

aloft · December 9th, 2003, 12:45

Thanks FalconCapt...very cool. I learn something new here every day!

p.s., are you the same FalconCapt from flightinfo?

FalconCapt · December 9th, 2003, 13:00

[ QUOTE ]
p.s., are you the same FalconCapt from flightinfo?

[/ QUOTE ]

The one and only...

December 8th, 2003, 18:23	#1
Baronman Senior Member Join Date: Dec 2001 Location: NEWARK Posts: 1,078	Embraer Question I flew on an Embraer 145 about 2 weeks ago and noticed some "strakes" on the oatboard leading edge of the wing. I counted 3 or 4 of them, all equal in length extending about 12 inches out. The aircraft doesn't have leading edge devices so that takes out the possiblity of them being some sort of rails or hinges. Can anyone identify them?

December 8th, 2003, 18:56	#2
aloft Old Skool Join Date: Sep 2001 Location: Inside your OODA loop Posts: 7,016	Re: Embraer Question Stall fences? Vortex generators?

December 8th, 2003, 19:01	#3
FalconCapt Banned Join Date: Nov 2003 Location: USA Posts: 489	Re: Embraer Question Aloft is probably right... Were they above or below the wing? Most likely a device to tame the stall characteristics for certification.

December 8th, 2003, 22:31	#4
Joe Senior Member Join Date: Mar 2003 Location: Warwick, RI Posts: 530	Re: Embraer Question Do you mean those yellow pointy thigns hanging under the wing?

December 8th, 2003, 23:08	#5
Doug Taylor Agent Smith Join Date: Dec 1969 Location: KSDL Posts: 41,217 Blog Entries: 1	Re: Embraer Question vortilons. If you need more info, one of my croanies is an Emb-145 CA for COex (displaced from mainline as a 737 FO at Continental).

December 9th, 2003, 07:40	#6
sorrygottarunway Senior Member Join Date: Oct 2003 Location: DXR, Connecticut Posts: 1,177	Re: Embraer Question yeah that would be cool... I've always been curious about the ERJ vs CRJ competition... ERJ "looks" faster, max cruise of 450kts, the CRJ-200 (also 50 seater) has a high cruise of 464kts... ok, I guess thats not much of a difference. But I always wonder how the regionals make that key decision between two aircraft with almost the same performance. And yeah, what the heck are those yellow slits. If they were stall fences, would they not have to be above the wing? Does this have something to do with (I cringe to say this again) "swept-wing design" where at certain speed, airflow is not over but laterally down the wing? Or maybe its just a place for the capt. to hang his coats...

December 9th, 2003, 07:55	#7
FalconCapt Banned Join Date: Nov 2003 Location: USA Posts: 489	Re: Embraer Question "Another interesting aerodynamic change from earlier modes of the B-767 is the addition of three vortilons under the leading edge of the outboard slats. During stall testing, Boeing found that stick forces were getting light near the stall, and that uncommanded roll at the stall would produce up to a 20-degree bank. Both characteristics were within certification tolerance, but with the addition of the vortilons, the flow separation problem near the stall was eliminated. [b]Vortilons, found on aircraft from the LongEze homebuilt to the EMB-135/145, and now the B-767-400ER, can energize the airflow just enough to eliminate a potential problem."[b]

December 9th, 2003, 12:45	#8
aloft Old Skool Join Date: Sep 2001 Location: Inside your OODA loop Posts: 7,016	Re: Embraer Question Thanks FalconCapt...very cool. I learn something new here every day! p.s., are you the same FalconCapt from flightinfo?

December 9th, 2003, 13:00	#9
FalconCapt Banned Join Date: Nov 2003 Location: USA Posts: 489	Re: Embraer Question [ QUOTE ] p.s., are you the same FalconCapt from flightinfo? [/ QUOTE ] The one and only...

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