Side Slip

[BOATCH]

Hi I need some advice on the approatch over some obsticals. I always use flaps one notch on approatch but , can one use flaps and side slip on approatch.This is on a 3 axis

[justin.schoeman]

Only the Operators Manual will tell you that... Some aircraft have no restrictions on slipping with flap, some do have restrictions.

[RV4ker (RIP)]

Check POH, else
Hang it on the prop with full flaps (near the stall and not comfortable)
Slip it in with no flaps. (Practise at alt. i can get the RV to loose 2000ft a min at 80mph and when "kicked out" she just squats without much (still practising) a bump
Also consider a descending turn approach to finals maybe not coming directly over the obstacles...

There are some awesome sites on the web. Google stick & rudder or back country flying or bush flying. Some of the sites in Canada are awesome for this sort of thing. We hardly have any strips they would consider "short"

[Mogas]

What airframe Boatch?
As mentioned, some manufacturers do not recommend side or more correctly for your case, forward slips with flap. This is due to "blanking" of the tailplane and causes a nose down bunt which is easily recoverable at altitude but not so good when you are ducking in over the trees!
If your plane is approved for slips you should practice and use this useful descent aid.
http://www.youtube.com/watch?v=cy6pzI9c ... re=channel
I use slips all the time, with lots of flap.
To me there is nothing more satisfying than a full rudder slip right into the flare, finishing it with a 3 point touch down.

[Stephan van Tonder]

We use slip with first notch of flap on the cheetah often - yours being a skyranger it should be Ok as it's a similar airframe.

[RV4ker (RIP)]

http://www.youtube.com/watch?v=wW8GRJI6Kz4

[BOATCH]

Thank for all the inf on the side slip,i read the manual and as Stephan said they do recomend one to use sideslip on obsticals. But i must say the clips of the pilot using the slip does it very neat.I will go out and practice it this weekend.Did it in training but that was some 250 hours back and always using 1.4km of runway one seem to not use it mutch.

[Mogas]

http://www.youtube.com/watch?v=wW8GRJI6Kz4

Now that's what I'm talking about!

[Stephan van Tonder]

Just remember to never introduce up elevator while holding the controls crossed for side slip as that are all the elements for a snap roll and keep the speed well above stall.

[BOATCH]

Stephan thanks that is something to keep in mind.I used the side slip this weekend and my wifes eyes got as big as golf balls.She have flown with me in the past and did not know wat sideslip was,but i get a nasty vibration on the aircraft on a S\S to the right side but not to the left.

[Mogas]

Just remember to never introduce up elevator while holding the controls crossed for side slip as that are all the elements for a snap roll and keep the speed well above stall.

This statement cannot go unchallenged
Snap rolling a Bushbaby or similar would involve HUGE control inputs. Do you perhaps mean an uncoordinated stall leading to a spin? If so then the difference to a slip and a skid should be explained:
Slip The wings are banked with ailerons and the turn stopped with rudder opposite to the direction of the turn.
SkidThe wings banked with aileron and too much rudder is used in the direction of the turn.
In an uncoordinated stall, the wing which stalls first will be the slower one and the one towards which the rudder is turned.
Both maneuvers are uncoordinated.
Of the two, the skid is far more dangerous than the slip as it will be the lower wing which will stall and can rapidly invert the aircraft.
A stall during a slipping maneuver will have the high wing stall first, allowing a lot more time to identify and correct the condition.
Bottom line, know the difference between the two. Provided your aircraft is rated for them, practice and use slips. Beware of skidding turns, these can bite you in the ass very quickly if you are slow and pull the nose up.

[justin.schoeman]

Some aircraft to roll VERY agressively in a cross controlled power on stall (i.e. what you would get when stalling in a slip). A Jabiru is a good example - it will be inverted before you can blink.

Other aircraft (like apparently the Cessna Skycatcher!) can end up in an unrecoverable spin from a cross controlled stall.

Others just nod down gently, and you keep on flying.

[Mogas]

I am trying to clear things up.
Lots of ambiguity for the newbies! this is the training board so let's get it right.
We are talking about slips, there is no power in a side slip used to increase the rate of descent.
A snap roll is a high speed stall maneuver.
It is pertinent to point out the difference between a slip and a skid.

[BOATCH]

Mogas ,i think you got it right with the no power on the slip,cause that is what i did wrong,TO MUTCH POWER.

[justin.schoeman]

I am trying to clear things up.
Lots of ambiguity for the newbies! this is the training board so let's get it right.
We are talking about slips, there is no power in a side slip used to increase the rate of descent.
A snap roll is a high speed stall maneuver.
It is pertinent to point out the difference between a slip and a skid.

sorry - wasn't paying attention - the thread is about slips for obstacle clearance, which are obviously done without power...

(There are times you use power-on slips - mainly for visibility, but that is indeed a different beast.)