Imagine I have an engine failure in cruise flight with a Cessna 152 or 172.
Should I select 10° flap to increase glide angle?
Would it give me more range to reach safety?
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You keep it clean: adding flaps adds drag. You can see this in Section 3 of the Cessna POH, which includes a Maximum Glide (distance) diagram. In the C172S POH that I checked, it notes that maximum distance is achieved with:
- SPEED 68 KIAS
- PROPELLER WINDMILLING
- FLAPS UP
- ZERO WIND
(A tailwind would extend your range, but only in one direction.)
Two other points worth noting: