Fuel And Oil Mix - Desert Aircraft DA-215 Owner's Manual

Fuel and Oil Mix

 For the DA215, use Premium pump gas, such as 91 to 93 octane.
 We recommend purchasing your fuel from "name brand" gas stations. We often see problems with
cheaper gas from some discount type outlets.
 We recommend filtering your fuel between your fuel container and your plane's fuel tank when
fueling your plane.
 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.
 Do not use silicone sealers on the fuel system. Gas can break it down and carry it into the carb.
 Use a high quality synthetic oil. Red-line Two Stroke Racing Oil, mixed at 40 to 1, is strongly
recommended. We have not tested a better oil for our engines than Red Line Two Stoke Racing Oil
(We do not recommend the Red Line Smokeless Oil). If Redline Two Stroke Racing Oil is not
available, Motul 800 (50 to 1) is a short term option. Use these oils during and after break-in. Do not
use a lower quality oil to speed the break-in process.
Break-in
 We do not recommend breaking the engine in on a test stand. The stationary load and lack of air
ducting can lead to severe engine overheating.
 Special break in props are not required. Just don't start with something beyond the recommended
sizes. Over loading the engine creates excessive heat. Peak rpm should be over 5,400 during the
break-in process.
 Adjust the needles as needed and give the engine a few easy flights. Maneuvers like
"Hammerheads" help to cycle the engine temperatures during break-in. The needles may need
adjustment as the engine settles in or when other things change such as different props, exhaust,
weather, and altitude.
 The engine should run well from the beginning and improve as flight hours accumulate.
Engine temperatures
 Temperatures can vary greatly at different locations on the engine and can change quickly at
different throttle settings. Near the spark plug, max temp at full throttle is approx. 325 F (162 C). All
other locations should be cooler.
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.
 While special/small break-in props are not required, avoid over loading/heating the motor with large
props that limit RPM to 5,400 or less. The recommended max operating rpm during break-in is
approx. 5,800.
 Some recommended props during and after break-in are:
Wood: 34x12, 32x14
Carbon: 32x14, 33x13, 34x12
 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.
4