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Whoa! (Taiwan aircraft crash)

Westy

the teste
Nov 22, 2002
56,390
22,460
Sleazattle
Looks like it was an ATR. My dad received some of the first shipments of these in the US. I don't think any US commercial carriers fly them anymore. Not the best safety record, but usually human error.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
Looks like it was an ATR. My dad received some of the first shipments of these in the US. I don't think any US commercial carriers fly them anymore. Not the best safety record, but usually human error.
Yeah, they sent them all down to PR due to how much they suck in ice.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
The wing on that thing is relatively small and pretty highly-loaded, doesn't usually make for a very forgiving aircraft. Generally wing loading on twins is higher than singles due to all the air blown from the props that provides additional lift and makes up for having more wing area, but the small-ish wing on the ATR was part of why it did so poorly in ice, there wasn't much to support it to start with, coupled with poor deicing systems, tailplane icing, etc. Supposedly the guy here said he "flamed out" an engine on takeoff, which depending on the aircraft means lower the nose way down, or pitch way up to V2, but you better get the speed right and feather the propeller, otherwise if you start stalling, it'll rotate/bank/spin right into the ground, which is what this kind of looks like unfortunately. A spinning prop with no power is a huge drag on that side of the plane. Once that starts, you can't stop it that close in.
 

Westy

the teste
Nov 22, 2002
56,390
22,460
Sleazattle
The wing on that thing is relatively small and pretty highly-loaded, doesn't usually make for a very forgiving aircraft. Generally wing loading on twins is higher than singles due to all the air blown from the props that provides additional lift and makes up for having more wing area, but the small-ish wing on the ATR was part of why it did so poorly in ice, there wasn't much to support it to start with, coupled with poor deicing systems, tailplane icing, etc. Supposedly the guy here said he "flamed out" an engine on takeoff, which depending on the aircraft means lower the nose way down, or pitch way up to V2, but you better get the speed right and feather the propeller, otherwise if you start stalling, it'll rotate/bank/spin right into the ground, which is what this kind of looks like unfortunately. A spinning prop with no power is a huge drag on that side of the plane. Once that starts, you can't stop it that close in.

Hard to tell from the video but it looks like the flaps are up. Wouldn't air blow from the prop have minimal lift contribution due to essentially 0 angle of attack in the flaps up state?
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
Hard to tell from the video but it looks like the flaps are up. Wouldn't air blow from the prop have minimal lift contribution due to essentially 0 angle of attack in the flaps up state?
No, it's usually a pretty significant amount of lift on a propeller aircraft like that. The other way you realize it is usually when you reduce the power close to the ground, flaps or not, the aircraft can drop pretty fast unless you are more than a few feet from landing, due to the loss of induced lift. This is why the russians and US at one time made some high wing "blown wing" jet aircraft in an attempt to get short-field performance. Point being that a ME aircraft of the same weight as a SE aircraft usually has a smaller wing area and higher wing load, because more of the lift is provided as induced (blown) lift.
 

Pesqueeb

bicycle in airplane hangar
Feb 2, 2007
42,339
19,846
Riding past the morgue.
Hard to tell from the video but it looks like the flaps are up. Wouldn't air blow from the prop have minimal lift contribution due to essentially 0 angle of attack in the flaps up state?
As I understand it, the pilot of this aircraft had stated they had lost one engine. Multi engine propeller driven aircraft, (all multi engine aircraft actually, but it's more pronounced with props) have a "tendency" to roll and yaw when they lose one engine. That being true, they are generating not just lift on only one wing, but having to fight roll and yaw as well. It's possible I suppose that the cockpit might have been a bit "busy" at the time of the incident, losing a engine on takeoff induces all sorts of shenanigans all at once.
 

Westy

the teste
Nov 22, 2002
56,390
22,460
Sleazattle
As I understand it, the pilot of this aircraft had stated they had lost one engine. Multi engine propeller driven aircraft, (all multi engine aircraft actually, but it's more pronounced with props) have a "tendency" to roll and yaw when they lose one engine. That being true, they are generating not just lift on only one wing, but having to fight roll and yaw as well. It's possible I suppose that the cockpit might have been a bit "busy" at the time of the incident, losing a engine on takeoff induces all sorts of shenanigans all at once.

I had to write up some MATLAB code that simulated an autopilot compensating for loss of an engine. At the end of the day it was pretty easy to control, I just crashed 100 or so planes before I got it right. Was a very simplified linear model of straight level flight.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
Well, that will make you dead real fast in a ME aircraft. With no power and just one feathered prop it's like dropping a brick off a tall building, not like Sully's A320. Jets glide many times better.
 
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StiHacka

Compensating for something
Jan 4, 2013
21,560
12,510
In hell. Welcome!
With a bit of green and root beer paint, it ain't looking as bad. I traveled in that thing many times and beats turbo props hands down.

 

Westy

the teste
Nov 22, 2002
56,390
22,460
Sleazattle
With a bit of green and root beer paint, it ain't looking as bad. I traveled in that thing many times and beats turbo props hands down.

I like turboprops. The noise drowns out any sounds other passengers make. Last thing I ever want to do is listen to the other dipshits on a flight. Thankfully I can now listen to music during take off and landings. The Dash-8 is hands down my favorite smaller plane to fly in.

 

Pesqueeb

bicycle in airplane hangar
Feb 2, 2007
42,339
19,846
Riding past the morgue.
I like turboprops.
:stupid:
I used to work on these old girls:


Not as swanky as the Dash 8, but I kind of miss them. Prop noise and the vibration put me out faster than any sleeping pill. I don't know that I have ever once stayed awake for a whole flight on a brasi. Sadly the last of ours are being phased out by the end of the year.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
With a bit of green and root beer paint, it ain't looking as bad. I traveled in that thing many times and beats turbo props hands down.

It also sucks more gas than a turbo prop, hands down.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
I like turboprops. The noise drowns out any sounds other passengers make. Last thing I ever want to do is listen to the other dipshits on a flight. Thankfully I can now listen to music during take off and landings. The Dash-8 is hands down my favorite smaller plane to fly in.

I get the cockpit jump frequently in the DHC-8. It takes off good, but it doesn't climb so good.
 

Jm_

sled dog's bollocks
Jan 14, 2002
20,493
10,965
AK
I'll take poor ascending over undesired descending any day.
Well that's just what you'd get. The DHC-8 is slow and a poor performer once it gets off the ground, unlike the similar Q400 (stretched, modernized, with far more powerful engines). Can take forever to get from 20,000 to 23 or 25,000, sometimes it won't happen.. Once that DHC-8 starts getting ice, it'll be descending undesired. Great short field and rough field performance for plane of it's size, but it struggles to get out of it's own way once airborne.