The DLA116 is a toplevel gasoline engine designed for giant scale model aircraft, manufactured by FeiaoModel. It is engineered to be powerful, lightweight, and easy to adjust and operate, promising years of outstanding performance.
Function Description
The DLA116 is a gasoline-powered internal combustion engine primarily intended for use in large-scale model airplanes. It provides the necessary thrust to propel these models, offering a balance of power and reliability. The engine's design incorporates components from world-famous brands for critical parts like the spark plug, ignition system, bearing, and carburetor, ensuring high quality and performance. The crankcases are machined from aluminum alloy, enhancing wear and damage resistance, and ensuring precise bearing alignment, which is crucial for engine performance. The reliable auto-advancing CDI ignition system facilitates easy starting and consistent performance, providing a powerful spark while being fully shielded to prevent R/F noise.
Important Technical Specifications
- Performance: 11.8 HP at 7500 rpm
- Idle Speed: 1300 rpm/min
- Pulling Force:
- 26.8 Kg at 100 meters altitude
- 23.8 Kg at 1800 meters altitude
- Recommended Propellers: 26x10, 26x12, 27x10, 28x10
- Spark Plug: DLA CM6
- Exhaust Amount: 116 CC
- Diameter Stroke: 46mm x 35mm
- Ratio of Compression: 7.8:1
- Lubrication Ratio:
- 25:1 to 30:1 (Trial Run)
- 40:1 to 50:1 (Normal Flying)
- Weight:
- Main engine: 2520g
- Muffler: 115g x 2
- Ignition: 180g
- Ignition System Working Voltage: 6.6V to 8.4V (7.4V, 2S Li-Po battery recommended)
Usage Features
The DLA116 engine is designed for ease of use and reliability.
Engine Installation:
- The engine comes with a firewall mounting plate pre-drilled with four holes for #10 size screws.
- A spacer is required to keep the cooling fins clear of the firewall.
- Throttle return springs must remain in place to prevent excessive speed without positive control.
- The ignition battery should be mounted externally, at least 12 inches from the receiver or throttle servo, near the cowl.
- The carburetor requires at least 1 1/2" (38mm) of clearance from the bottom of the cowl. If clearance is less, an opening in the cowl below the carburetor, at least as large as the carburetor intake diameter, is necessary.
- A long, narrow screwdriver is recommended for adjusting needle valves through small holes in the cowl.
- The diaphragm pump carburetor allows for flexible tank placement, as its location is not critical relative to the fuel entry position. Placing the tank on the aircraft's center of gravity (CG) prevents trim changes during flight.
Fuel Requirements:
- Clean petrol 93# is strongly recommended.
- Higher-octane fuel will not generate more power and may cause the engine to run slower and overheat.
- Damage caused by fuel additives (e.g., nitro), over-lean carburetor settings, over-advanced timing, and overheating are not covered under warranty.
Ignition System:
- The red cable is positive (+), and the black cable is negative (-).
- Direct connection of a Li-Po battery to the DLA ignition is required.
- Correct coordination of the sensor(s) to the magnets is important for new ignition fitting.
Propeller Selection and Installation:
- Only recommended propeller sizes (26x10, 26x12, 27x10, 28x10) should be used.
- Propeller blades must be of the same length.
- A drill press is required to drill the propeller from the rear, with a drill guide or the propeller washer used as a template.
- Propellers must be balanced.
- Screw thread-locking glue is necessary for propeller bolts. Loose prop bolts can lead to prop movement and bolt shearing.
Engine Starting Procedure:
- Fill the tank with fresh, filtered fuel.
- Ensure receiver and ignition batteries are charged, receiver and transmitter are on, and the throttle is set to low.
- Close the choke and turn on the ignition switch.
- A rubber stick is recommended for starting.
- Flip the prop through its compression stroke until the engine fires.
- Wait for the propeller to stop spinning, turn off the ignition, and open the choke(s).
- Switch the ignition back on and flip the propeller again until the engine starts.
- Warm up the engine for 15-20 seconds before advancing the throttle.
Carburetor Tuning:
- A tachometer is highly recommended for tuning.
- Never adjust needles while the engine is running.
- High Needle (H) Tuning: Tune for maximum power using the tachometer. Then, richen the high needle until the engine runs 100-200 RPM less than the maximum RPM, then richen slightly more.
- Low Needle (L) Tuning: Run the engine at idle for 60 seconds, ensuring constant idle RPM. If the idle RPM drops or the engine stops, the low needle is too rich. Lean the low needle until a constant idle RPM is achieved.
- Check the transition with a quick throttle advance; it should produce quick, steady power.
Maintenance Features
Regular maintenance is crucial for the DLA116 engine's longevity and performance.
Carburetor Care:
- The carburetor screen needs to be cleaned with clean gasoline and blown off with compressed air after every flight.
- Check the choke and throttle plates for tightness.
Troubleshooting:
- Engine Flooding: Remove the spark plug, turn the engine to drain fuel, and clean it. Check spark plug and screw connections. If the issue persists, send it for after-sale service.
- Engine Starts and Stops (after choking): The low needle on the carburetor is likely too lean. Adjust the Low End needle for a smooth idle and reliable transition to high throttle. Stuttering or coughing in the mid-range or upon throttle advance indicates a rich low-end or even high-end needle.
- Rough Running and Strong Vibration:
- Balance the propeller.
- Check ignition timing.
- Inspect plumbing for air/fuel leaks.
- Check the spark plug for carbon and verify the gap.
- Ensure the engine mount is rigid and on a level surface, and the crankcase is free of tension.
- Check engine and propeller bolts.
- Engine Not Reaching Normal RPM at Full Throttle:
- Check carburetor settings.
- Verify if the propeller is too large.
- Check for engine overheating.
- Inspect ignition timing.
- Check the spark plug for defects.
- Verify the correct muffler system, gasoline, oil, and mixture ratio.
Warranty:
- DLA engines come with a limited two-year warranty on materials and workmanship to the original purchaser.
- Warranty Exclusions: Damage caused by improper handling, operation, modifications, or maintenance; damage from a crash; damage from using improper fuel or additives; and damage incurred during transit to the After Service Center are not covered.
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