Another F1A washin question

[Anonymous]

1.. Is it worth taking out inner wing wash-in during straight tow? I
am used to towing with a small amount of opposite rudder to neutralize
the wing wash-in which gives the model a degree of “steering” by varying
line tension (tow speed). I hope taking out wash-in would eliminate any
weaving tendencies but am worried that the model will be less
“steerable” without a balance of opposing forces, as well as the
constant moving of the wing servo during long tows adding to the drain
on the batteries.

Neil Murry posted by Jim Parker

[Anonymous]

1. If you have an electronic wing wiggler you should definitely use it
during tow! I’ve been doing this for years and it should not be any
strain on the battery, especially if you are using a LiPo cell as these
have extrodinary capacity for the weight. Even if you weren’t moving
the wing during tow, the servo will still need energy anyway just to
keep the wing in the correct position. The settings are a matter of
taste. Some prefer the wings to be dead straight for straight tow and
of course washed in for circle tow. I prefer just a very slight amount
of wash during straight tow and then about a mm for circle tow. Kicking
in that extra wash for circle tow when the hook moves back really helps
the model to turn quick on the line.

[Anonymous]

1.. Is it worth taking out inner wing wash-in during straight tow?
It is very important to remove the large amount of “conventional warp” for
the straight part of the tow. The large amount of warp helps keep the circle
tight and flat but is a considerable problem as soon as tension is applied.
At low speed (i.e. in the circle) the higher incidence inboard produces drag
but when the model is speeded up the increased incidence acts as aileron and
turns the model away from the circle. The huge advantage of a wing wiggler
is that you can have lots of differential for the circle and everything
straight for the straight tow – wings level and rudder straight. This makes
the straight tow independent of speed – and hence very comfortable to tow
and launch because it always goes straight.

[Author]

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