Would certainly need a reduction of flap limiting speed.
As aerodynamic loads vary as the square of velocity, a 10% increase in flap
lift/drag load (for the sake of argument resulting from a 10% increase in
flap angle) would reduce white-arc maximum speed by a factor equivalent to
the inverse of the square root of 1.1. So 95 knts becomes 90 knts.
Presuming that the limiting speeds were not in the first place determined at
the original angles used on the prototype.
Duncan McF
----- Original Message -----
From: "David Joyce" <davidjoyce@doctors.org.uk>
Sent: Wednesday, August 06, 2008 9:15 AM
Subject: Re: Europa-List: Maximum flap extension?
>
> <davidjoyce@doctors.org.uk>
>
> There is the consideration that increasing the flap extension beyond its
> stated limit might push the structural limits of the flaps. Don Dykin's
> booklet on the aerodynamics of the Europa says that at max flap speed the
> flaps support about half of the plane's weight. Could an extra 3 degrees
> and a corresponding change of the angle of the flap lift force be the
> straw that did for that particular camel? Regards, David Joyce, G-XSDJ
> ----- Original Message -----
> From: "Duncan & Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
> To: <europa-list@matronics.com>
> Sent: Tuesday, August 05, 2008 7:51 PM
> Subject: Re: Europa-List: Maximum flap extension?
>
>
>> <ami@mcfadyean.freeserve.co.uk>
>>
>> Or not.
>>
>> The mono is limited to 27 degrees of flap extension in order to prevent
>> is
>> taking off before the controls are effective. Which confirms that more 27
>> degrees of flap extension is effective!
>>
>> There is at least one trigear flying with more than the standard flap
>> movement (30+); this was achieved by a longer-stroke servo.
>>
>> Theoretically, fowler flaps don't like more than about 30 degrees,
>> although
>> G-YURO tested to more than this.
>>
>> The non Mono Europa, which has its own speed break (the monowheel swing
>> arm)
>> could certainly do with more drag at full flap. And sideslipping has
>> little
>> effect!
>>
>> Duncan McF.
>>
>>
>> ----- Original Message -----
>> From: "G-IANI" <g-iani@ntlworld.com>
>> To: <europa-list@matronics.com>
>> Sent: Tuesday, August 05, 2008 10:00 AM
>> Subject: RE: Europa-List: Maximum flap extension?
>>
>>
>>>
>>>
>>> As David says it should be 26-27 degrees. Mine ended up dead on 27.
>>>
>>> Ian Rickard G-IANI XS Trigear, 200 hours
>>> Europa Club Mods Rep (Trigear)
>>> e-mail mods@europaclub.org.uk
>>> or direct g-iani@ntlworld.com
>>> -----Original Message-----
>>>
>>> Frans, For the XS mono kit 402 the manual says the aim is to get the
>>> flaps
>>> to extend to 26-27 degrees. The supplied Europa final inspection sheet
>>> stipulates minimum 25 and max 27 degrees. Hope this helps. regards,
>>> David
>>> Joyce
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
>
|