FWIW I put the cuffs on before my first flight and changed my pitot to a
cessna probe with a small 1/8" orifice but it is 5" under the wing just
inboard and just barely ahead of the strut connection similar to what
Bob mentions. I haven't walked into it yet and it works fine at all
speeds. In theory the airflow is always parallel to the wing bottom in
that location. I also use cabin static but guess I need to find an
"exterior" source to get the static system signed off for transponder
legality.
Bob
You figure the cuffs cause you to cruise more nose down???
Hmmm - I thought the opposite and rationalized that the drooped
leading edge effectively reduced the wing's incidence.
Granted it does add more camber (makes for a more curved wing) but I
didn't think that mattered much at cruise speed...
Ken
still asking questions and learning :)
Bob Patterson wrote:
Hi Rick !
Congrats on getting flying again !! Great, isn't it ?!!!
Welcome to the Rebel ! The ASI problem you have is
NORMAL !!!! Almost ALL Rebel ASI's tend to read low on the high
end, and high on the low end ..... most likely because of the
huge range of angles achievable.
One solution is to go to a much larger diameter pitot tube -
say 3/8" +. This gives a wider area for pressure, and a better
chance of closer readings. Best location is about 3-6" below
the wing, about 1/3 of the way back - plain tube mounted on the
inboard side of the strut, fastened to the wing by thin, wrap-around
straps worked for me on 2 Rebels.... Most just use cabin air
for static - it's VERY difficult to find a good position for source.
You could play around with the angle of mounting the
pitot tube - likely it's different now than original. The cuffs
will likely allow cruise at a more nose-down attitude - but
unfortunately, also allow a ridiculously high attitude for
landing ! Test aircraft have the end of the tube mounted
on a pivotting shuttle-cock, so it's always aligned to the
airflow !
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