Advertisement
Fuel and Oil Mix
•
For the DA35, use Premium pump gas, such as 91 to 93 octane.
•
We recommend purchasing your fuel from "name brand" gas stations. We have seen problems with cheaper gas from
some discount type outlets.
•
We recommend filtering your fuel between your fuel container and your plane's fuel tank. A high flow filter, or
clunk/filter, between the tank and motor is also a good idea.
•
Make sure the plane's tank is well vented and the fuel clunk moves freely.
•
Use of any other fuel or additives such as nitro formulas, aviation gas, white gas, etc., can harm the motor and void
the warranty.
•
We recommend a high quality synthetic oil. As for the brand of oil, there are many good ones on the market. Some
oils, and their mix ratios, that Desert Aircraft recommends are Red-line Two Stroke Racing Oil (40 to 1) and Motul 800
(50 to 1). These oils can be found at most motorcycle shops.
Break-in
•
We do not recommend breaking the engine in on a test stand. A stationary load and lack of air ducting can lead to
engine overheating. After a few short runs and any required needle adjustments, we recommend flying the engine.
The engine should run well from the beginning and improve as flight hours accumulate.
•
Special break in props are not required. Just don't start with something beyond the recommended sizes. Over loading
the engine creates excessive heat. We recommend that peak rpm should not exceed 8,400 rpm. The normal peak
rpm range for break-in and normal flying is 7,500 to 8,200 rpm.
•
Adjust the needles as needed and give the engine a few easy flights. The needles may need adjustment as
engine settles in and when other things change such as different props, exhaust, weather, and altitude.
Recommended Props
•
Always check and tighten prop bolts before each flight! Loose prop bolts allow prop movement, which will shear the
bolts.
•
Always use the correct length prop bolts! If a spinner back plate is not used, the prop bolts may be too long and can
bottom out in the hub before they fully tighten against the prop washer.
•
The exhaust system, weight of the airplane, field elevation, etc., will have an effect on what prop load will work best
for your application. Prop loads can vary from one prop to another, even when both are marked as the same size.
Carbon fiber props usually have thinner airfoils and often produce higher rpm than the same diameter and pitch wood
prop.
•
Some recommended props are:
2 Blade
20x8, 20x9, 20x10, 21x8
3 Blade
18x10, 19x11N
•
The DA35 has a wide power band. Again, the normal peak rpm range for break-in and normal flying is 7,500 to 8,200
rpm
•
Smaller diameter props with more pitch, especially 3 blades, can reduce tip speed and noise.
•
Always use a drill guide to drill your props.
•
Always check the balance of your prop.
•
For safety, we recommend painting the tips of your props (front and back) with a bright color, especially on black
props.
Starting
1.
Check that prop bolts are tight and spinner is secure.
2. Make sure the starting area is free of dirt, sand, gravel, or other loose debris
3. Turn on the radio system and check the throttle operation and position.
4. Have someone (with eye protection) firmly hold the plane.
5. Close the choke completely.
6. Open the throttle to approximately 1/4 position.
7. Turn on the ignition. BE SAFE! ALWAYS BE PREPARED FOR THE MOTOR TO START ON
ANY FLIP OF THE PROP, whether the ignition switch is on or off!
8. Always wear a heavy leather glove when starting the motor.
9. Give the prop a quick, firm, flip counter clockwise. Follow through quickly as you flip the prop so
your hand is out of the propeller's path. Repeat until the motor fires or "pops".
6
Modellmarkt24.ch
the
(Continued)
Advertisement
