Not what you told me re the monowheel!=0AG=0A=0A=0A=0A=0A__________________
______________=0A From: Ivan Shaw <ivanshaw@btinternet.com>=0ATo: europa-li
st@matronics.com =0ASent: Tuesday, 30 July 2013, 13:18=0ASubject: RE: Europ
a-List: Tri-gear Flap Cross Tube Slot Length=0A =0A=0A--> Europa-List messa
ge posted by: "Ivan Shaw" <ivanshaw@btinternet.com>=0A=0AI tested the flaps
down to 40 degrees, ailerons worked just fine.=0AIvan=0A=0A-----Original M
essage-----=0AFrom: owner-europa-list-server@matronics.com=0A[mailto:owner-
europa-list-server@matronics.com] On Behalf Of Frans Veldman=0ASent: 30 Jul
y 2013 10:23=0ATo: europa-list@matronics.com=0ASubject: Re: Europa-List: Tr
Frans Veldman =0A--> <frans@privatepilots.nl>=0A=0AOn 07/29/2013 11:25 AM,
GRAHAM SINGLETON wrote:=0A=0A> don't use 30 degree flap, Europa tested it a
nd found you are starting =0A> to lose aileron control at the low speeds ac
hieved in ground effect.=0A=0AI have some trouble believing this (and even
when it is true it is=0Aquestionable whether this is still a valid reason f
or the XS with the=0Aincreased aileron span and with more powerfull engines
).=0A=0AWith higher flap settings you are getting more drag than additional
lift.=0AWith 10% more flap (30 degree instead of 27) you will get maybe ju
st 5% more=0Alift. If the ailerons are inadequate for this tiny bit of extr
a lift I think=0Athey would have difficulties handling 27 degrees as well.
Furthermore, in=0Athe XS the ailerons are substantially increased in lenght
, significantly=0Amore than 5%, and should have much more control power at
low speeds! Even if=0Acontrol problems were the limiting factor, than it is
questionable whether=0Athe same limit would still be needed for the XS.=0A
=0AI thought that the limitation in flap was because of the 80hp engine use
d=0Afor the certification, which might have lacked sufficient power to exer
cise=0Aa go around with full flaps under full load (which is, if I remember
=0Acorrectly, a certification requirement. For the same reason the older=0A
Cessna's have 40 degree flaps, where the newer ones have 30 degree which wa
s=0Ainstantly rewarded with a 30Kg higher MTOW without any structural chang
es).=0A=0AFurthermore, in the tri gear the fact that you have the option to
use 30=0Adegree flaps doesn't mean that you will have to use this all the
time.=0AThere are situations where more flap would be welcome, and there mi
ght be=0Asituations where using less flap would be better. I can't see the
benefit of=0Athe 26 degree limit. Of course for the mono you have no other
option than to=0Aland with full flaps, so maybe in this case the limitation
is justified.=0A=0AI know folks having drilled a new hole in the lugs on t
he flap control tube,=0Aso that the actuator can drive the flap further (an
d faster). No control=0Adifficulties are observed even in quite a few nasty
situations with 30 knots=0Awind and lots of turbulence. Instead the short
field capabilities are=0Asomewhat improved.=0A=0ARegards,=0AFrans=0A=0A=0A
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