May 21, 2011

HASEL

Recently got back from my second flight where we worked on Exercise 10 (Flight for Range and Flight for Endurance) and Exercise 11 (Slow Flight). I also got to perform the take-off, but I'll discuss that later.

There are two methods you can use to determine power settings for flight for range/endurance. The first, and easiest, is to find this info from your POH. The second method, which you will have to do to get your PPL, is the Experimental method. You and your instructor will work together on this (One will fly the plane, the other will record the data), and will eventually get the power settings. For example, in the DA20-A1, the optimum power setting for Flight for Range is about 25" Manifold Pressure, and the power setting for Flight for Endurance is about 17" Manifold Pressure.

Now, Slow Flight. Before you begin, you must follow the HASEL checklist:
H- Height (Make sure you have enough altitude to recover from a stall if you enter one)
A- Area (Make sure you are not over a built up area, and make sure there is a spot for an emergency landing if necessary.
S- Secure (Make sure all seat belts are securely fastened, and make sure that all baggage is properly stowed)
E- Engine (Turn Carb. Heat on for a few seconds to check for ice, turn fuel pump on, and make sure that the engine instruments are reading that the engine is operating normally)
L- Look Out (Check that there are no aircraft around you)

After completing the HASEL check, perform a 90 Degree turn to either the right or left (Make sure to turn away from any built-up area), and then make another 90 Degree turn, this time in the opposite direction.

To enter Slow Flight, you first want to decrease power to the Flight for Endurance level (In my case 17" Manifold Pressure). Then, enter a slightly nose-high attitude to continue slowing down, and to correct for any drop in altitude. Next, add flaps in stages (This will drop the Airspeed to a level where you will begin to descend). Finally, add power, but only enough to keep the Vertical Speed Indicator neutral. (At this point, the Stall Warning horn will continue to sound)

To recover from Slow Flight, first increase to full power. As you continue to accelerate, raise the flaps back up to their normal position. Let your altitude increase until you are back to the point you started at. Finally, reduce power back to cruise setting (In the Katana, this is about 22" Manifold Pressure).

My next flight will be next week, and we get to do stalls and spins :D... And I may also get to work on landings. Until then, Adam.

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