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#31
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12-06-2014, 07:31 AM
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 My Rank: MASTER SERGEANT Poster Rank:485 Man...iac Join Date: Jan 2011 Posts: 2,152 Mentioned: 0 Post(s) Quoted: 253 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
When I was taking flying lessons in the 1980's, I learned at the very beginning of the lessons to use hard right rudder during the takeoff roll. When you throttle a plane up when it's going slow, the prop tends to make the plane turn left. Not bank left but yaw to the left. If you want to google it, it's called "p-factor". When the instructor pushed the throttle in (to make it go), the student apparently didn't push the right rudder pedal down in sync with the throttle and that what made the plane turn left. They could've recovered easily just by controlling the plane. So why didn't the instructor take over and save them? And the other big question is why did the instructor power down for a moment when the plane was heading towards the deadly trees? |
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#32
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12-06-2014, 02:53 PM
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 My Rank: FIRST SERGEANT Poster Rank:474 Join Date: Dec 2012 Posts: 2,275 Mentioned: 13 Post(s) Quoted: 1262 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
During takeoff, a propeller aircraft wants to yaw to the left because of torque trying to twist the aircraft in the opposite direction of engine rotation which puts more weight on the left wheel, thus more drag. P-Factor or asymmetrical thrust occurs in nose high attitudes where the descending blade has less of an angle of attack which also yaws the aircraft to the left. I didn't even think of P-factor being an issue here so thanks for bringing it up. Looking back at the video, it appears the aircraft is coordinated but it's hard to tell from the quality. Maybe it was a little uncoordinated and coupled with the very low airspeed, the left wing stalled more than the right and started the spin towards the ground. Sucks. |
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#33
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12-07-2014, 02:31 AM
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 ★ Legacy Member ★ Poster Rank:72 male Join Date: Apr 2010 Posts: 21,150
Contributions: 1
Mentioned: 52 Post(s) Quoted: 4949 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
 that was pretty fucking stupid!!pulled the power back and let it settle in!!! dumb  |
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#35
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12-10-2014, 08:17 AM
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 My Rank: PRIVATE FIRST CLASS Poster Rank:3930 Male Join Date: Jul 2009 Posts: 81 Mentioned: 0 Post(s) Quoted: 21 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
I'm not so sure that p-factor is a huge factor in this crash. To respond to the other post, I've never had to give "hard right rudder" to counter it, maybe an inch of pedal deflection at most. If there's a crosswind coming from the right, then yeah, it takes a bit more pressure. I think they veered off to the left because the pilot failed to remain in control of the aircraft, and rather than get back on centerline of the runway they went ahead and continued on course, probably because getting into a steep turn at that low speed with flaps down would cause a stall and they knew that. The fatal mistake (IMO) was the tool that pulled power before they were clear of the trees. By the time he added it back in, they were barely above the treeline, and human nature in that situation is to pull up to avoid the obstacle. Wings stalled, the left one first, and they spun in. |
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#36
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12-10-2014, 08:20 AM
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| My Rank: PRIVATE FIRST CLASS Poster Rank:3930 Male Join Date: Jul 2009 Posts: 81 Mentioned: 0 Post(s) Quoted: 21 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
Also, thanks for moving my video post in here. I wasn't sure if it was a repost or not, so I'm glad we can have this discussion in one place.  |
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#37
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12-11-2014, 12:12 AM
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| My Rank: FIRST SERGEANT Poster Rank:474 Join Date: Dec 2012 Posts: 2,275 Mentioned: 13 Post(s) Quoted: 1262 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
It seems the initial turn towards the left into the trees was intentional. You would drift to the left in heavy winds, not just bank. And even if you did bank due to turbulence, you would easily correct it with aileron input. Something just doesn't seem right. If he had stayed on runway heading, we wouldn't be seeing this video right now.
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#38
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12-16-2014, 10:31 PM
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| So Fucking Banned Poster Rank:3620 Male Join Date: Mar 2010 Posts: 94 Mentioned: 0 Post(s) Quoted: 35 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
Left landing gear didn't deploy, didn't lock, or broke (fixed gear)... when they land the left wing almost hit the ground which forced them to go around. The crash on the other hand... I don't know. At first I thought the left wing struck a tree during the turn but idk. They weren't going slow enough to stall but idk. Maybe a stuck/failed aileron but again, idk. I do know 1 thing... altitude is your friend and they kept it too low in my opinion to troubleshoot any malfunctions. |
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#39
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12-16-2014, 11:32 PM
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| My Rank: PRIVATE Poster Rank:15529 Join Date: Jan 2010 Posts: 5 Mentioned: 0 Post(s) Quoted: 2 Post(s)
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Re: Cockpit Camera Captures Russian Student's Plane Crash
Looks to me like the aircraft was going to slow. After the failed landing they probably should have banked right and not tried to climb over those trees, all it takes is some strong wind or a down draft and it's going to push you below stall speed.
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