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.

Besides starting with model airplanes in the 1950's, I've
flown for over 30 years and instructed countless pilots.

--

-TV

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