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CARF-Models Co., Ltd, Contact email: techsupport@composite-arf.com
First some important information
The weight balance of the Valiant was designed to accommodate most motors with,
some adjustment of the center of gravity (C/G) being needed on others. If you are flying
Glow or Electric, the stabs are cut out for Mini servos, and these servo's can be in-
stalled in the stab halves, with little adjusting of C/G required to complete final balance
in the radio installation process.
If you intend to use a 2 Stroke, a YS 1.70" NON CDI", or a YS 1.60, the airplane could
be tail heavy, if you install the servo's in the stabs; so, be careful and thoughtful with
your installation. You may need to run a push rod or pull-pull system on the elevator and
make some cover plates for the stabilizer servo cut outs. This will make it easier to
adjust the proper C/G. Just be aware of the weight during the building process. Shulman
Aviation makes an extension wire for rear servo setup in the stabs that will save you
some weight in the rear of the airframe, should you run the elevator servos in the stabs.
The airplane is supplied with two center tank mounts to mount the tank. It is made to be
used in range from the Tetra™ 16 Ounce to the 20 Ounce and should be installed
centered on the C/G under the wing tube, so there are no trim changes during the
flights. If you are running a standard YS1.60 or 1.70, I would recommend a 16 to 20
ounce tank. If you choose to run a YS ignition motor, you can get by with only a 12-
ounce tank for any pattern in use today. However, the tank cutouts are standard for the
20 Ounce Tetra Crank Tank, and they will need to be modified if you use a smaller tank.
The C/G is on the center of the wing tube, so place the tank in this position for best
results.
Engine cooling
This is a big issue for YS Motors, especially the 1.70 YS.
You may have to dam your engine compartment with foam around the engine head to
ensure proper airflow around the engine head. YS engine box foam works great for this
purpose. Look at the photos in this manual. If using a YS 1.70, you will need to remove
the center of the cut out in the front of the chin, for the best cooling on the hottest days.
Also, you may choose not to add the side cut out like I recommend on the chin. If you
choose not to use this cooling method, make sure you cut a big enough cooling exit for
good airflow.
Very Important Information on the center hinge wings and stabs
Comp Arf has manufactured a very nice and precise product, however, some precau-
tions are required by you, the builder. You must install very precise, quality servos in the
wings. If there is excessive looseness around center, along with engine vibration, you
may encounter aileron flutter, so chose your servos carefully. Do not disregard this step.
The same pertains to the elevators; you must use very precise servos for best results
Page 3
Instruction Manual "Valiant" (Draft Version)
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