DESAFIO
S
Yours truly and
Desafio S
Desafio S. A proven
performer designed
and flown by the
Somersini's.
Some improvements
can be made
by changing the
stab position and increasing
its area to avoid
wing root vortex caused
by the lack of
a wing faring. The vortex
affects the tail
and rudder at certain speeds
and angles of
attack.
More views Desafio
S
Yours truly at
UMAC Erskine Park Australia
Dad and plane
TECHNICAL
STUFF
on
the DESAFIO S
Desafio tailplane
showing my method of hiding servos from oil and decreasing
their parasite
drag. Yes they are full size JR NES 2000 Superservos and the
stab is the original
thickness as per plan. Stab halfs slide in with servo arms
as in left pic.
The radio is then turned on and arms pop up through slots in
the stabs.
MK links then are connected. Many people have asked how this was
done. Here are
the pictures and explanation.
Construction photos
taken 1996.
Picture showing
servo in operating position.
Left: Pics
showing refueling system buy Chris White, MK tank in sponge lined
expandable cradle
for YS pressurized fuel system, Jex header system
and remote electrical
start plug leads.
Right: Ys 120
SC with air filter and Aero Trend pink fuel tubing clamped with
Tetra fuel tube
clips to avoid those high pressure leaks, MK exhaust
bracket, Hatori
silencer.
MK ball raced
linkages and horns provide no freeplay in control
surfaces. A must
in every serious F3A patternship. You can tell
the difference
when the is no free play in the control surfaces.
Mk retracts with
Chris White undercarriage struts and MK alloy wheels.
Yes there are
a normal JR NES 2000 Super servos in each stab
providing elevator
control. The stabs are normal thickness.
There are no exposed
servos in this model, a promise to Stephen
Mitchell, my aeronautical
engineer advisor.
_________
______
Neat MK ball bearing
connectors. They are a must for F3A
as engine vibration
wears out normal control links after only
a few flights
especially on planes with large motors that vibrate
or four strokes.
Slight wearing cause the slack in control surfaces.
One set will last
a life time. JR low profile 7000 Superservos hidden in wing
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