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kuffel(at)cyberport.net
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 Posted: Thu Apr 29, 2010 9:08 pm Post subject: Angle of Bank vs Stall Speed/Approach Technique |
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Robert,
<< I would, on a high final, deliberately stall the old crate, or pretty close to it. Sure would lose a lot of altitude
and the wings would stay nice and level. Then I'd toss a touch of throttle at it and squeak it on nice and short. >>
A slight variation of this is very common when landing on short, no go-around strips like in the mountains. The difference is choose a speed slightly higher than Vso but lower than normal. And return to normal approach speed before touchdown. By flying within this back side of the power required curve you can greatly change your approach point without drastic maneuvers by simply modulating your speed. It is counter intuitive to shorten your touchdown point by slowing down (raising the nose slightly) and lengthen by speeding up (lowering the nose slightly) but is quickly mastered. This is much easier on passengers' nerves than a sideslip and easier to judge than S-turns. Relating to prior discussions, this airspeed changing is done only on final after the last turn is over.
Hesitate to mention but for really short strips a related but different and risky procedure is required. Get level with your touchdown point. (These strips seem to always be on the sides or tops of mountains so level approach is possible. If not, get as close to level as you can.) Put the airplane as close to stall as you dare. Control altitude with lots of engine power. When you get to the strip threshold smoothly reduce or cut the power as required and plop down the final, hopefully less than 6, inches. For a Kolb can't think of a strip where this extreme technique is necessary.
But try the first technique, initially with lots of margin, then closer to maximum. Even us old fuddy-duddies can use it safely if we don't wait too long to return to normal approach over the threshold.
Tom Kuffel
[quote][b]
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri Apr 30, 2010 3:07 am Post subject: Re: Angle of Bank vs Stall Speed/Approach Technique |
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The link is a video of a Zenith 701 or 750 using the "level" approach method that Tom described.
http://www.youtube.com/watch?v=s0gXSk_f250
Note the ASI during landing and take-off. Unfortunately, you can't see the power/rpm setting nor hear the engine due to music and the commentary audio track.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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David Lucas
Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL
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| Posted: Sat May 01, 2010 12:27 am Post subject: Re: Angle of Bank vs Stall Speed/Approach Technique |
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| Quote: | | Hesitate to mention but for really short strips . . . . |
You have to be really desperate to consider this option . . . i.e. the level approach to a sloped strip. ! ! ! ! So your 'hesitation' is well noted !
Used to do a lot of Jungle flying in Papua New Guinea many years back in which we used to fly into strips some of which had around 15% gradient and gouged out of terrain of a much steeper gradient. Yes, it was in 'spam cans', C185, 206's and the like, but the principle still applies.
If you fly this 'level approach' technique, you throw away all your safety margins. Given the sloping terrain all around and the high probability of optical illusion in such scenarios, what you 'think' is level may not be and until you're on shortish final and finding that your putting in more and more power to get to the threshold (and you're probably committed by this stage), it's only then that you realize that in actual fact you're climbing and on the back of the power curve to boot and maybe not enough power to get there anyway, if for example, you get caught in a downdraft, not uncommon in mountain flying.
Stalls with high power settings whilst climbing usually produce a fairly dramatic maneuver which will probably take more altitude to recover than you have available. So you really are courting danger considering this option.
We had it drummed into us to do a 'normal' descent profile (which allows you to steepen up if your a little high or shallow out if your a little low) and to either carry a little more speed or power to cater for the increased energy required to flare to a higher than normal attitude. (On the steeper strips we then had to apply full power just to get to the top of the strip !)
You just had to get used to the new 'apparent' steep profile during your approach. Once you got used to that it was all OK. I think the only time I did one of those 'level' type approaches was because of low cloud base where there was no other option other than divert and looking back I think that would have been the wiser option, but I was young then (ahem).
David.
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kuffel(at)cyberport.net
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| Posted: Mon May 03, 2010 8:42 pm Post subject: Angle of Bank vs Stall Speed/Approach Technique |
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David,
<< 'level approach' technique, you throw away all your safety margins >>
Agree, mostly, with all your points. Didn't say this was safe, didn't say I
like doing it. Said, sorta, this approach was commonly used in Alaska for
very short strips. For example, "Little Mount Susitna International" was on
top of the 2nd ridge across Cook Inlet. It was marked with a Clorox bleach
bottle nailed on the left side at the north end. North of the bottle was a
"rapid" decent. To the south the ground actually sloped down and after 100
feet was covered with hummocks. In other words, you had better touch down
very close to the Clorox so you could be slowed down before the big jolts
began.
But as you note, we were a lot younger then.
Regards,
Tom Kuffel
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