Slip With Flaps
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- alanhawse
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Slip With Flaps
I cannot find in the POH any restrictions for Slips with either T/O or Landing Flaps.
Is this right?
Does this mean I can slip with either?
Presumably the only restriction would be the speed?
Thanks,
Alan
Is this right?
Does this mean I can slip with either?
Presumably the only restriction would be the speed?
Thanks,
Alan
- Boatguy
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Re: Slip With Flaps
The 40NG AFM does say this in 4B.3.3 Low Fuel
Prolonged un-coordinated flight can cause fuel starvation to the engine resulting in a loss of power.
3. Return to coordinated flight (not more than approx. half a ball sideslip, 3° - 5° bank)
I routinely get the low fuel light when taxiing and less than 8-9 gal in the left tank.
Prolonged un-coordinated flight can cause fuel starvation to the engine resulting in a loss of power.
3. Return to coordinated flight (not more than approx. half a ball sideslip, 3° - 5° bank)
I routinely get the low fuel light when taxiing and less than 8-9 gal in the left tank.
- alanhawse
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Re: Slip With Flaps
Yes…you are correct … and I often get that warning turning onto the taxiwayBoatguy wrote: ↑Sat Sep 24, 2022 8:18 pm The 40NG AFM does say this in 4B.3.3 Low Fuel
Prolonged un-coordinated flight can cause fuel starvation to the engine resulting in a loss of power.
3. Return to coordinated flight (not more than approx. half a ball sideslip, 3° - 5° bank)
I routinely get the low fuel light when taxiing and less than 8-9 gal in the left tank.
I got it today while slipping on a power off 180 near the ground … which makes me wonder if I shouldn’t slip? I probably slipped for 30 seconds to get rid of some altitude
I wish I knew the answer?
- BkFlyer
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Re: Slip With Flaps
I have likely slipped for a total of several hours in my DA40 over the years and definitely don’t think it’s something to avoid for these reasons. First, typical use case for a slip would not fall under “prolonged flight”… a minute or two max. And usually on final, after the point where you have already made the runway. Assured landing without the engine, likely because you’re high, and therefore it’s probably the least risky part of a flight to lose the engine.
With that said, it makes sense to switch to the high wing’s tank prior to the slip given this discussion.
I have had instructors who emphasized slipping the 40 to lose altitude, and others who were adamantly against it claiming the airframe doesn’t like the stress and it doesn’t work well anyway. They preferring to pull back until the stall horn is just on (which is VERY effective). Each camp thinks the other is wrong so in the end I don’t think it matters. My preference is to trade speed for altitude on final, though I slip in often too.
With that said, it makes sense to switch to the high wing’s tank prior to the slip given this discussion.
I have had instructors who emphasized slipping the 40 to lose altitude, and others who were adamantly against it claiming the airframe doesn’t like the stress and it doesn’t work well anyway. They preferring to pull back until the stall horn is just on (which is VERY effective). Each camp thinks the other is wrong so in the end I don’t think it matters. My preference is to trade speed for altitude on final, though I slip in often too.
- Rich
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Re: Slip With Flaps
This is a cool thing to have in your toolbox. In his book "Stick and Rudder" Wolfgang Langewiesche discusses the value of sometimes flying "behind the curve" for various phases, this being one of them.
My ability to slip is somewhat limited since I have the original smaller rudder. One need not switch tanks, BTW. If you're slipping to lose altitude (aka forward skip) you can choose to slip left or right, away from the tank you're already using.
I think the original question had to do with the fact that some aircraft can have a problem slipping with full flaps due to airflow blanketing over the horizontal stabilizer/elevator. It seem to me certain older 172's were in this camp.
2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5
- BkFlyer
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- Soareyes
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Re: Slip With Flaps
I've read that the engine in a DA40NG draws fuel from one tank only, the left "main" tank. Does that mean that a 40NG should only slip with the left wing high?
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- dmloftus
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Re: Slip With Flaps
I don't see a similar warning in the DA40-180 AFM. Is there any concern with extended uncoordinated flight? I suppose if same conditions were true, on a normal DA40 you would only want to slip with the currently selected tank high as Adam stated?
- Boatguy
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Re: Slip With Flaps
The Citabria I used to fly had no flaps. Slip to landing was the only way to bleed airspeed (of which there wasn’t much to begin with lol). A very useful skill to have though.
Last edited by nickJG on Sun Sep 25, 2022 9:00 pm, edited 1 time in total.