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Undershoot with best glide speed

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(@user3833)
New Member Customer
Joined: 14 hours ago
Posts: 2
Topic starter  

Hi all,

There was a question asking when there is an engine failure and you are already at the best glide speed for a forced landing, however, it seems like you will undershoot on a windless day, what should you do?

A. Raise the nose
B. Increase the speed
C. Remain at the best glide speed

Thank you very much guys.



   
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(@john-heddles)
Famed Member Customer
Joined: 10 years ago
Posts: 955
 

With my eyes rolled up .. (c) is the option they are after.

However .. "none of the above" is the better answer .. none of the options is likely to work to your advantage.

The preferred option (missing) is "find another, closer, paddock to aim for .." In the end analysis, the pilot's plan apparently was somewhat flawed .. the aim is to stay high until you are in the final pattern.

Caveat .. if you are flying a constant speed or adjustable prop .. pull full coarse .. makes a very big difference to the drag and descent angle. Back in my parachute flying days, we routinely used pitch for drag control throughout the descent to allow for a reasonably constant modest power setting for cooling control.


Engineering specialist in aircraft performance and weight control.


   
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(@user3833)
New Member Customer
Joined: 14 hours ago
Posts: 2
Topic starter  

Thanks a lot John, may I ask what if there is headwind or tail wind? Will the answer be different?

Thanks again,



   
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(@john-heddles)
Famed Member Customer
Joined: 10 years ago
Posts: 955
 

Indeed.

(a) headwind will see a better glide distance with an increased speed.
(b) tailwind will see a slight improvement in glide distance with a reduced speed.

How much speed change ? Aircraft drag polar dependent.


Engineering specialist in aircraft performance and weight control.


   
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