User manual DESERT AIRCRAFT DA150

[. . . ] TOC CHAMPION MASTERS CHAMPION IMAC NATIONAL CHAMPION TUCSON SHOOTOUT CHAMPION DA150 Owners Manual Introduction The DA150 was designed to provide the highest quality and performance in Giant Scale modeling. Unlike most other large gas engines on the market, the DA150 is not a combination of various industrial motor parts. Desert Aircraft computer designed the DA150 from the ground up as a high performance aircraft engine. Existing cylinders, pistons and crankshafts were plentiful and cheap, but did not offer the performance and other features that we needed. [. . . ] Sometimes placing heat shielding material between the exhaust and carburetor can help. 3 Ignition System · When making electrical connections to the ignition system, use the same gauge wire (or larger) as used on the red and black power leads on the ignition module, all the way to the battery pack. Heavy-duty plugs, as supplied on the ignition or as used on electric cars and planes, are recommended. · Use a high quality switch such as JR's heavy-duty switch. Standard size R/C receiver switches are not recommended. · Isolate the charge circuit from the ignition while charging the batteries. In other words don't "charge" the ignition module. · Use 4. 8 or 6 volt batteries only. Higher voltage will damage the ignition system and will void the warranty. We recommend a 1200 mAh or larger capacity pack. With this size, the ignition should last longer than your receiver pack will. If the meter shows 5. 0 volts or less, don't fly, re-charge. · Unlike some ignitions, the Desert Aircraft ignition is designed to spark only when the prop is flipped at a high speed. If the prop is not turned over at "starting" speed, the ignition will not fire. This helps to prevent the motor from firing accidentally. Unless you are having problems starting the motor, don't bother "testing" the ignition with the plug removed from the cylinder. · When removing the spark plug caps, PULL STRAIGHT out on the caps. Do not pull on the shielded ignition wires!If caps seem loose and are not making a solid metal to metal contact with the spark plug base, use a small hose clamp around the base of the cap to keep them firmly attached to the base of the plug. To prevent radio interference, the spark plug caps must have the split retainer ring around the base to insure a tight fit. · Protect the shielded plug wires from rubbing against fiberglass or sharp edges of wood or metal. Rubber grommets and plastic "spiral wrap" insulation from automotive or electronic supply stores work well. Holes in the braided shielding can emit R/F noise (i. e. : RADIO INTERFERENCE!) · Keep ignition components and wiring separated, as much as possible, from your receiver, receiver battery, servos, wiring and switches. [. . . ] Sometimes the metering hole is in side the cowl and the carb intake is out side in a very different environment. Even with both inside the cowl, there can be enough of a variance to affect the performance. The optimum is to have both operating in the same environment. These problems, and the cures for them, vary from plane to plane. [. . . ]