On 01/01/2019 19:10, Tauno Voipio wrote:
> On 31.12.18 17:13, The Natural Philosopher wrote:
>> On 31/12/2018 15:00, Tauno Voipio wrote:
>>> On 31.12.18 13:03, The Natural Philosopher wrote:
>>>
>>>> My experience is flying aircraft at much lower heoghs and wingspans
>>>> < 2 meters.
>>>>
>>>> Gusts are quite slow things. Once clear of the boundary layer,
>>>> windspeeds do vary but over seconds. Not tenths of a second, That
>>>> would be heard as infrasound.  Like thunder etc.
>>>>
>>>> Most full size pilots seem to not use ASI for final appriach as far
>>>> as I can tell - they adopt the techniques I discovered myself with
>>>> models. Keep the speed UP and fly into the ground. Dont glide in.
>>>> That way there is a bit of excess speed to allow for downdraughts or
>>>> a wind lull. Once on the ground, well, use the controls to STAY
>>>> there and dump airspeed as fast as possible...
>>>
>>>
>>> The idea of landing a full-scale aircraft is to stall it
>>> at a height of a some inches.
>>
>> Bollocks.
>>
>> Only per WWII tail draggers land that way,
>>
>> What they do is arrange to be flying level an inch above the runway
>> with PLENTY of excess airspeed. Then genbtly lose an inch of altitude.
>> One the wheels are dwon then its full reverse thrist and airbrakes to
>> keep it there,
>>
>>
>>   The standard approach is
>>> done with a speed of 30% above the stall speed. The aircraft
>>> will sit on the runway with nose slightly up.
>>>
>>
>> Exactly. ABOVE stall speed.
>>
>>> If you fly the aircraft into ground, it will bounce, and
>>> the bounces will get progressively worse, unless somerhing
>>> is done and quickly. The rule of my aerobatic instructor was:
>>> 'The propeller will get hurt on the third bounce'.
>>>
>> You didnt understand what I said. Perhgaps 'fly the aircarft all the
>> way to the ground' is a better way of putting it.
>>
>> The point is into a headwind you need to maintain an airpspeed of
>> stall+ headwind so that if the wind drops to zero you dont fall out of
>> the sky.
>
>
> You are mistaken. Please go to the nearest airport with
> commercial flight operations and look at the attitude
> of an airplane at the touchdown moment. It will be about
> 5 degrees nose up.
>

Ypu are mistaken,  Please go to the nearest airport with
commercial flight operations and look at the *glide angle*
of an airplane at the touchdown moment. It will be about
1 degree or less.

The attitude of the plane has nothing to do with it. The space shuttle
glies like a brick with a huge angle of incidence.

Myy poiit is that you do not 'stall' a plane onto the ground. Not since
tiger moths and WWI biplanes.

You *fly* it in with airspeed well over stall.



--
“Some people like to travel by train because it combines the slowness of
a car with the cramped public exposure of 
an airplane.”

Dennis Miller

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