engine out on twin
#2
Join Date: Jul 2007
Location: BouldercombeQueensland, AUSTRALIA
Posts: 559
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
Just think of all that drag on the dead motor side, and all the thrust on the other side.
That's why you don't turn into the dead motor, cause that's where the plane is wanting to go anyway.
And it better if the right motor dies that the left, just to add fuel to your debate.
That's why you don't turn into the dead motor, cause that's where the plane is wanting to go anyway.
And it better if the right motor dies that the left, just to add fuel to your debate.
#4
My Feedback: (10)
Join Date: Sep 2004
Location: Displaced Canadian in Central Texas TX
Posts: 2,601
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
I agree, if the Left Engine goes out, the plane will pull to the Left; I think of it like a tracked vehicle, if the left track is neutral and the right track is pulling, the tank or bulldozer will pull to the Left; I have a twin and the Left Engine has gone out, and to keep it flying straight, you have to use right rudder, making left turns is easy, just let the rudder go to neutral and the plane will turn to the left
#8
Senior Member
Join Date: Nov 2005
Location: Rock Hill,
SC
Posts: 514
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
And of course, it's also a function of speed. An engine failure in normal cruise doesn't lead to an immediate yaw (at least in most of them!) As the speed decays, the turn becomes more pronounced.
Russ Farris
Russ Farris
#9
Senior Member
Join Date: Jun 2009
Location: Douglassville,
PA
Posts: 311
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
The plane will go left. Apply right rudder and dont kill the other engine. Those still props will add alot of drag and slow you down quickly. I know this from experience! I made that mistake with my Cessna Bobcat almost 20 years ago.
#10
Join Date: Jul 2007
Location: BouldercombeQueensland, AUSTRALIA
Posts: 559
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
I don't want to sound like I'm nit picking, but strictly speaking, an idling prop will produce more drag than the stationary ones.
Strange but true, I had to read the maths on it before I would believe it.
Strange but true, I had to read the maths on it before I would believe it.
#11
RE: engine out on twin
ORIGINAL: mboland
... strictly speaking, an idling prop will produce more drag than the stationary ones.
... strictly speaking, an idling prop will produce more drag than the stationary ones.
Well, it wasn't time yet and the model flew right past me about waist high at a speed well above my normal landing speed when the engine is idling. Frantically I got the wheels down on the runway but it still rolled off the end of the runway and flipped in the tall grass. Yep, I can agree with that quote above.
#12
RE: engine out on twin
On a twin, if the left engine dies the centre of thurst moves towards the right engine. The centre of drag will move slightly left giving a resultant left yaw and left roll.
Unlike being in the cockpit an R/C pilot will not feel the yaw so "dead foot dead engine" does not apply. But an uncommanded roll (hopefully with engine noise loss)
will be the give away for the failure.
So as the model rolls, first react to the roll with right aileron, reconigise the engine failure (sound,performance etc,), put full right rudder (the direction of the aileron input).
Lock the right rudder input and ease off the aileron to neutral.
Balance rudder input to throttle, power on-rudder on, power off-rudder off.
Do not throttle back and keep the nose level to maintain speed. Speed is your friend, never fly a twin slow or use high nose attitudes at low speed.
Unlike being in the cockpit an R/C pilot will not feel the yaw so "dead foot dead engine" does not apply. But an uncommanded roll (hopefully with engine noise loss)
will be the give away for the failure.
So as the model rolls, first react to the roll with right aileron, reconigise the engine failure (sound,performance etc,), put full right rudder (the direction of the aileron input).
Lock the right rudder input and ease off the aileron to neutral.
Balance rudder input to throttle, power on-rudder on, power off-rudder off.
Do not throttle back and keep the nose level to maintain speed. Speed is your friend, never fly a twin slow or use high nose attitudes at low speed.
#13
My Feedback: (6)
Join Date: Mar 2004
Location: Corpus Christi,
TX
Posts: 190
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
I am real pilot and I also have a real twin.
There are a number of things the pilot has to do when flying a scale twin verses flying a R/C plane when it comes to flying with one engine. The main thing is to get the plane on the ground in one piece.
Another helpful hint in flying an R/C twin, when you do lose the engine try to make your turns in the same direction the engine is running to get back to the runway, if possible. The plane will want to yaw or turn into the engine that has stopped working. Turning in the opposite direction you have a less chance of spinning the plane into the ground when making the turns.
I have seen this happen more than once. Were a pilot will recover from a lost engine but as soon as he starts his turn back to the runway he turns the plane and into the ground it goes.
Hope this helps.
Walts
#14
RE: engine out on twin
I've seen alot of twins spin to the ground on one engine. The problem is its hard to know which engine is out or if an engine is out. Would be nice if someone could come up with a sensor on each engine that could tell the transmitter to sound off a beep and flashing light telling the pilot what side is out. I think for very expensive twins this would be ideal.
#15
My Feedback: (2)
Join Date: Feb 2002
Location: Orange,
NJ
Posts: 1,334
Likes: 0
Received 0 Likes
on
0 Posts
RE: engine out on twin
We go by feel. The plane will yaw as soon as an engine goes out. Now how much of a yaw depends on how far apart the engines are. The further apart the more violent of a yaw you will get. That is why they saw if you going to fly twins you better be a rudder pilot, because when an engine go out and you feel a twitch your rudder finger has to be instantaneous or else you in trouble. It has to be a reflex action, not something you have to think about.
#17
My Feedback: (23)
RE: engine out on twin
In single engine ops with a multi engine airplane, airspeed is king! Without it, its going to spin in. If your in level cruise, add the rudder input and power quickly (not instantly, quickly, its more important to be accurate and fast, that it is to be instant and wrong!). If you are in a climb, quickly add the correct rudder input, get the gear up and lower your rate of climb (remember, airspeed is KING!). If you ever find yourself in a situation where you have full rudder input and the airsplans is yawing in the opposite direction, Immediately lower the nose and reduce the power (you are at at under the minimum controllabable single engine airspeed), to increase your airspeed, slowly add power as the airspeed increases and then start a slow climb again.