Reely THREE-LEG LANDING GEAR 40TH CLASS HAN157 / 426C5 Hoja De Datos

The mechanical retraction landing gear is intended for use in model airplanes with an engine size of up to
6.5 ccm. It is controlled with special landing gear servos with a rotation angle of approx. 180°. Standard servos with
their small rotation range are not suited to operate mechanical retraction landing gear.

Due to the fact that the construction of a retraction landing gear does not have the stability of a
rigidly mounted landing gear, the model pilot must be able at all times to start his model gently and
also perform soft landings. When using retraction landing gear, hard-top runways should be
preferred to gras runways in any case.
Damage caused by uneven runways or hard landings are not covered by the guarantee/warranty!

Model size: ....................... 40s model with max. 6.5 ccm
Max. landing gear height: 160 mm
Landing gear wire Ø: ....... 3.5 mm
Wheel axis Ø: ................... 4 mm
Max wheel width.: ............. 22 mm

The telescopic leg of the landing gear (1) is retracted/extended using the drive lever (2).
If the drive lever is pressed into the landing gear block (3), the telescopic leg retracts. Once the telescopic leg is
completely retracted, the lever must be pushed one step further to lock the telescopic leg in retracted state. This
way, the telescopic leg cannot extend on its own due to the centrifugal force.
Ill. 1 A shows the landing gear in retracted but not yet latched state.

If the drive lever is pulled out of the retracted and locked landing gear, first the latch releases, then the telescopic
leg extends.
Once the telescopic leg is completely extended, the lever must be pushed one step further to lock the telescopic
leg in extended state. This way, the telescopic leg cannot retract on its own.
Fig. 1 shows the landing gear in extended and locked state.

With some models, a retractable landing gear is already installed in the factory. The wings are equipped with the
corresponding shafts (1) and reinforcements (2) (see fig. 2 above).

The wheel shaft (4) must be covered in any case to protect the inside of the wings from dirt build-
up.

If the landing gear is to be installed in a self-constructed surface, a corresponding cut-out must be prepared on the
surface. Attach this on a hardwood slab (4) and glue it together with the wing core underneath the wing planking
(5). For specific information, refer to the design documents of the model.
If necessary, prepare an assembly drawing at a scale of 1:1, which you then attach to the model with a strip of
adhesive tape.

Important!
The landing gear cut-out must be dimensioned appropriately to ensure enough clearance between
the landing gear and the wheel/model. This way you ensure that the landing gear does not get stuck
when extending and retracting it.

The two main landing gears (1) mounted in the wings are controlled via a central landing gear servo (2), which is
also installed in the wing.
With the three-leg landing gear (order no. 205161), it is basically possible to also operate the nose gear (3) via this
servo. However, as the wings are detached in most cases for transport, we recommend installing an own servo (4)
for the nose gear permanently in the tail. Both servos are then operated via a V-cable on a joint receiver output.
The length and shape of the control rods (1) depends on the respective model.

With the landing gear, a suitable fork head (2) is screwed on to the control rods (1) with a piece of fuel hose as safety
ring and the plastic bottle suspended on the operating lever (3). With the servo (4) a ball and pan joint (5) is mounted
respectively. The angled installation shown in the drawing does not transfer tension or pressure on the rods to the
servo system. The two attachment points of the ball joint socket must be approx. 11 mm away from the pivotal point
of the servo disk each.
If the threads on both sides of the steering rods are not sufficient for optimum length adjustment, you can also use
the plastic latches (3) for length adjustment.

Drawing A shows the servo/rod position with extended landing gear.
Drawing B shows the servo/rod position with retracted landing gear.

Important!
The steering rods must be dimensioned in such a way that the lading gear servo is not restricted
mechanically in its rotary motion in retracted or extended state. This would lead to a higher power
consumption during flight and damage the servo in the long run.

The front landing gear is installed according to the same pattern as the main landing gear and retracted/extended
by a separate servo. When installing it, make sure that the hardwood support of the front landing gear is installed
non-positive with the engine frame and that reinforcements are installed.
Besides the control for retracting/extending (1), the front landing gear is additionally controlled via rods (2) from the
side rudder servo.

This makes it easier to control the model on the runway. For this purpose, there is a movable control latch (3), which
enables the use of rigid control rods.

Practical tips
If it is too much effort to install rids from the side rudder servo to the front landing gear, you can also
apply a separate servo for the front landing gear control.

Slide the wheel axis together with the wheel onto the landing gear wires (2) and then first determine the required
length of the landing gear legs.
Once you have defined the exact position of the wheel axis, tighten the attachment screw (3) with a 2.5 mm
hexagonal screw driver.

Practical tips
To prevent the twisting of the wheel axis, use a key file on the spot on which the attachment screw
of the wheel axis lies on the landing gear wire and flatten it.

The protruding part of the landing gear wire (4) can be cut off at the end with a metal saw or a miniature drill with
a cutoff wheel.

In the end, the wheel is secured with one of the enclosed clamping washers (5).

Warning!
First attach the clamping washer when you do not have to dismantle the wheel any longer, as the
clamping disk is very hard to detach again and may not support the construction properly later on.

Prior to each start, check the proper function of the landing gear. This is the only way to ensure that the landing gear
retracts properly and also extends correctly again.
However, if you are forced to make an out of turn landing due to an engine failure, keep it retracted or retract it again
immediately. Experience has shown that damage to the model is much less in case of a belly landing this way than
with extended landing gear.
The transmitter operating button for the landing gear should always be easily accessible to be able to operate the
landing gear quickly in case of emergency.
Modern computer-controlled remote controls also offer the possibility to reduce the servo speed to enable proper
retraction and extension of the wheels.

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