ceiling effect

[Iain McFadyen]

>
> Extend the height of the hubs on the motor spindles so that the props
> never get close enough to the ceiling to enter the zone of lift enhancement
> due to the proximity of the ceiling.
>
> Or... drill lots of holes in the ceiling ;-)
>
> Iain
>
> On Tue, Jan 27, 2015 at 4:32 PM, Alex Fraser <beatnic at comcast.net> wrote:
>
>>  Perhaps you have heard of ground effect in aeronautics?  That's were
>> the ground provides a kind of cushion as it affects the lift of an airfoil.
>> I've ran into an interesting situation when flying my micro quad copter
>> in the house.  If you accidentally hit the ceiling the little critter will
>> kind of sticks there.  If you reduce the throttle enough which would
>> normally cause it to descend, instead it just stays on the ceiling.  To
>> break out of this "ceiling effect" I've had to cut the throttle so far back
>> that the craft free falls and since I cut the throttle and the only
>> stability it has is from the different prop speeds it tend to tumble.  When
>> I gun the throttle it don't mange to stop the little beast before it hits
>> the floor.  It usually hit pretty hard and with the props at full power, so
>> you often loose a blade when it hits.   The props have a small hub so that
>> is the part that rides against the ceiling.  I think the clearance between
>> the blade and the ceiling is only about a 32nd of an inch or so.
>>
>
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