Owners Manual - Desert Aircraft Australia
Contents
1. 1 4 or 6mm bolts with washers and locking nuts on the rear of the firewall Make sure your firewall is structurally sound The crankshaft centerline is in the exact center of the rear mounting plate bolt pattern The carburetor is equipped with a 4 40 ball link Make sure the carburetor s idle set screw is removed or set so that the carb can be fully closed by the servo at low trim Use a high quality servo for the throttle A poor quality servo or linkage will not provide accurate and repeatable throttle settings Don t use metal to metal linkages Do not remove the butterfly throttle shaft return spring One end of the spring can be cut or un hooked to relieve tension Removing the spring allows damage to the brass plate from vibration When you unhook the spring ensure it does not restrict the throttle lever Do not try to rotate the carburetor 180 deg on the mounting block or remove the butterfly shaft assembly The carburetor needs at least 1 1 2 88mm of clearance between the intake and the bottom of the cowl If there is less than 1 1 2 make an opening in the cowl below the carb at least as large as the carb intake diameter Since the carburetor must often be adjusted differently with the cowl on as compared to off we recommend small access holes be made in the cowl for adjusting the needle valves Sometimes the needles can be reached through the cowl s openings for the exhaust system A 50 oz fuel tank is the minimum recommen2. com au Safety Instructions WARNING This motor can cause severe harm to you and or others if misused or if these safety precautions and instructions are not observed Desert Aircraft is not responsible for any loss injury or damage resulting from the miss use of this product e You alone are responsible for the safe operation of your motor e Do not operate the motor if you do not want to be completely responsible for any damage or injury incurred or caused during its operation e Read all instructions before operating your motor e lf you have any questions about any aspect of operating this motor do not attempt to start or operate it e Never operate the motor or fly alone e When operating the motor never stand or allow anyone else to stand in front of or to the side of the propeller Always stand behind the propeller e Keep away from the prop while operating the motor Do not wear loose clothing near the motor or prop Do not run the motor near loose material such as dirt gravel power cords ropes sand etc Loose material can be drawn into the turning prop causing injury or damage e Always operate the motor in an open area Do not operate indoors e This motor can develop tremendous thrust Make sure the aircraft is properly secured when starting or operating the motor e This motor can stop at any time for a variety of reasons Do not fly your plane in a way that damage or harm will result if the motor
3. Da170 DESERT AIRCRAFT AUSTRALIA www desertaircraft com au DESERT AIRCRAFT AUSTRALIA Thank you for buying your DA170 Please read this manual carefully before you operate your engine Please be careful when operating your new engine make yours and the safety of others a priority Your new DA170 is a purpose designed model aircraft engine and proper care should be taken when in operation Desert Aircraft Australia is proud to stand by our products and happy to aid and assist you wherever we can If you have any questions regarding your engine and its operation please do not hesitate to call us We are here to help Please be aware that this is a petrol engine and silicone fuel tubing is not suitable Tygon or neoprene fuel tube is required not only to the carburetor but also in the fuel tank Standard unleaded fuel mixed at the required ratio see page 9 is all that is need for running your DA170 Your DA170 is well suited to many kinds of model aircraft from aerobatic scale war birds glider tugs and the likes Propeller selection will depend on the airframe and its intended use see page 10 So recommending the correct propeller is not a straightforward issue Obviously choosing a quality balanced propeller is a must and we will be happy to help with your selection DESERT AIRCRAFT AUSTRALIA Unit 5 74 Secam Street Mansfield Qld 4122 P 107 3422 0772 F 107 3420 6678 sales desertaircraft com au www desertaircraft
4. Mix Ratio 33 1 40 1 50 1 100 1 Mis Mis Mis Mis 1 Liter 30 3 25 20 10 5 Liters 151 5 125 100 50 10 Liters 303 250 200 100 15 Liters 454 5 375 300 150 20 Liters 606 500 400 200 Recommended Props Always inspect your prop and spinner and tighten prop bolts before each flight While special break in props are not required they can help speed up the break in process and reduce the risk of over loading the motor The following props are recommended For break in Xoar 30x12 32x10 Mejzlik 30x12 32x10 For normal use Xoar 30x12 32x10 32x12 Vess 32A 32B 32C 32D AirModels 31x12 32x11 Mejzlik 30x12 32x10 3 blades Mejzlik 28x12 28 5x12 29x12 AirModels 29x12 3 Blades Smaller diameter props with more pitch will help reduce noise The DA170 has a very wide power band The normal peak operating rpm for aerobatics is 5 500 to 6 300 rpm depending on prop selection sound requirements and pilot preference While with fine tuning it is possible to have an idle as low as 800 rpm normal freliabledidle rpm is 1 200 to 1 400 Always use a drill guide to drill your props Please note that the DA170 uses 6mm prop bolts Always check the balance of your prop For safety we recommend painting the tips of your props front and back with bright colour especially black props Never use a damaged or repaired prop or a prop that has struck the ground or any other object Damage that can be hard to see could turn into disaster
5. ded size Many pilots are using 60 oz tanks or larger The tank must be vented The carb has a strong pump so the tank can be mounted almost anywhere The fuel line must be petrol compatible and have an inner diameter the same or larger than the carburetor s fuel inlet fitting s inner diameter Make sure all fuel line connections are secure Small nylon zip ties 5 work well to keep the fuel line on the metal fittings Make sure the fuel line is secure and not touching the exhaust or cylinder fins Cooling is critical to motor performance and longevity Allow as much cooling air as possible in from the front of the cowl Allow an opening at least 2 1 2 times larger at the rear or bottom of the cowl for the hot air to escape Air must flow through the cylinder fins to properly cool the motor Air ducts can be made from thin plywood fiberglass or aluminum sheet to guide and force air from the front inlets to and through the cylinder fins Don t let the air take the easy way out Make it go through the fins Depending on the location of the exhaust system and cowl airflow the carburetor may need some air cooling also A hot carb can be erratic in flight or make the motor hard to restart Sometimes placing heat shielding material between the exhaust and carburetor can help lgnition 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 ignitio
6. ly use NGK CM 6 spark plugs Other plugs may not fit the plug caps firmly Plug gap is 0180to 020 38 to 50 mm Never operate the ignition without a spark plug in the plug caps This can permanently damage the ignition coil Fuel and Oil Mix Mid to High 89 to 95 octane pump petrol is recommended Never use leaded petrol Use of any other fuel or additives such as methanol nitro methane etc can harm the motor and will void the warranty Do not use Aviation Gas We recommend filtering your fuel between your fuel container and your plane fuel tank We recommend you use a filter between your fuel tank and the carburetor For break in we recommend a petroleum based oil such as Castrol Active 2T Mix at 32 to 1 These oils allow the rings to seat quickly limiting the opportunity for ring blow bydto take place before seating Switch to synthetic oil after 4 to 5 gallons of fuel have been used After the break in process we recommend high quality synthetic oil As for brands of oil there are many good ones on the market Some that Desert Aircraft recommends and their mix ratios are Redline 2 stroke Racing Oil 40 to 1 Castrol TTS 40 to 1 They can be found at motorcycle shops Redline can be sourced from DA Australia Make sure the plane tank is well vented and the fuel clunk moves freely Do not use any silicon sealers on the fuel system Petrol can break it down and carry it into the carb
7. n module all the way to the battery pack Keep wire length to a minimum 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 JRG 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 fcharge the ignition module i e RADIO INTERFERENCE Keep ignition components and wiring separated as much as possible from your receiver receiver battery servos wiring and switches Don use metal to metal linkages to operate the throttle Always perform a radio range check before flying Range with one section of the antenna extended should be at least 80 to 100 Ft with the plane on the ground and the motor running If there are fglitches DONG FLY Check for holes in the braided shielding Use 4 8 or 6 volt batteries only Higher voltage will damage the ignition system and will void the warranty We recommend a 1600 mAh or larger capacity pack With this size pack the ignition should last longer than your receiver pack will If the meter shows 5 0 volts or less dond fly re charge If using batteries rated at more than 6 volts a 5 5 or 6 volt regulator must be used When connecting the red pick up sensor to the ignition module make sure that the polarity of the wires entering the connectors is correct Brown to brown orange to orange Unlike s
8. nce Pink or purple coloured cylinders These colours indicate engine temperature has been too high Check that needle settings are not too lean airflow for cooling is sufficient oil gas mixture is correct Engine starts backwards Make sure prop is flipped forcefully through the compression stroke Without enough force the prop may backfire off compression and run backwards Bolt torque specifications Carb bolts 5mm 40 in Ibs Cylinder base bolts 6mm 75 in lbs Spark plugs 75 in lbs Prop bolts 6mm 75 in Ibs 13 IF ANY PROBLEM PERSISTS PLEASE CONTACT DESERT AIRCRAFT FIRST We designed and manufactured your engine and have built serviced and analyzed thousands more We cover your engine amp warranty not someone at the field or a stranger on the Internet Please give us the opportunity to help first Remember This motor can stop at any time for a variety of reasons Do not fly your plane in a way that damage or harm will result if the motor stops running Desert Aircraft will not be responsible for damage caused in engine out situations DESERT AIRCRAFT AUSTRALIA Unit 5 74 Secam Street Mansfield Qld 4122 P O Box 2240 Mansfield Qld 4122 Ph 07 3422 0772 Fax 07 3420 3250 Email sales desertaircraft com au www desertaircraft com au 14 DA170 WARRANTY Your DA170 motor and ignition system are covered with a 3 year warranty by Desert Aircraft starting from the date of purcha
9. ome 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 7 you are having problems starting the motor don bother rtestingothe 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 DONG FLY WITHOUT THEM 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 or loose connections spark plug caps connectors and switches If that doesn solve the problem re locate your ignition and receiver components farther apart If the problem persists return the ignition to Desert Aircraft for inspection Timing is set at the factory and should not need adjustment Contact Desert Aircraft if you have any questions regarding timing On
10. s the fuel mixture Turning the needles counter clockwise frichensothe fuel mixture e Settings will vary with altitude temperature humidity fuel carb variances etc A consistently good starting point is 5 8 of a turn open on the Low needle 2 turns open on the High needle The Low needle is very sensitive and should not vary much if at all from the 5 8 s setting 11 e Adjusting either needle can have a slight effect on the other Example leaning the low needle can slightly lean the high range e Adjust the Low End needle until you achieve a smooth idle and a reliable transition to high throttle Generally if the motor fstuttersdor fcoughs in the mid range or when the throttle is advanced the low end needle is too rich and possibly even the high end needle If the motor dies quickly the low end is probably lean e Adjust the High End needle to peak rpm A tachometer is a great help but remember that the RPM may drop a little after every start due to heat build up Don lean the mixture any more than necessary If the rpm steadily drops at full throttle or fades on long vertical maneuvers the motor is too lean and is over heating e Operating the motor overly rich not only reduces power it creates other problems such as poor transition pre mature carbon build up fouled plugs excessive exhaust residue sticking rings and rough running Trouble Shooting Motor won t start e Check battery voltage should be 5 0 vol
11. se e This warranty covers defects in workmanship and materials only e Do not disassemble the motor or ignition system Disassembly of the motor or ignition system can void the warranty on that item e Any modifications to the motor or the ignition system other than those authorized by Desert Aircraft will void this warranty This warranty does not cover the following e Shipping expenses to and from Desert Aircraft for warranty service e Damage caused by improper handling operation or maintenance e Damage caused by a crash e Damage caused by using improper fuel or additives e Damage incurred during transit to Desert Aircraft WRAP ENGINE CAREFULLY DESERT AIRCRAFT WILL NOT SHIP ANY WARRANTY REPLACEMENT ITEMS UNTIL POSSIBLY DEFECTIVE ITEMS IN QUESTION ARE RECEIVED BY DESERT AIRCRAFT 15 Repair Return Form Customer Details Name Address City State Postcode Phone Number REASON FOR RETURN DESERT AIRCRAFT AUSTRALIA Unit 5 74 Secam Street Mansfield Queensland 4122 P O Box 2240 Mansfield Qld 4122 Ph 07 3422 0772 Fax 07 3420 3250 16
12. stops running Inspect motor mount bolts and firewall integrity before operating the motor Anyone in the immediate area of the motor should use eye protection during operation of the motor Keep spectators at least 30 feet away when operating the motor Turn off the motor before making any adjustments Always use the proper size propeller Never use a damaged modified or repaired propeller Always use the correct length propeller bolts Do not use spacers behind the propeller Spinner cones must not touch the propeller Thinner props may require using shorter prop bolts especially if not using a spinner back plate Make sure your prop bolts do not bottom out in the propeller hub Check that the propeller bolts are tight before every flight Always install an ignition kill switch to stop the motor Adjust the carburetor linkage so that the motor will stop when the carburetor is completely closed Petrol is extremely flammable Be careful of any sparks from electrical contacts such as fuel pumps battery chargers etc Do not allow smoking in the area of your fuel supply or motor Store fuel in approved containers and in well ventilated areas Allow the motor to cool before touching or fueling Always turn the prop a few revolutions after running the motor to discharge the ignition system The ignition system develops extremely high voltage Do not touch it during operation Motor Installation Mount the motor using high grade
13. ts and all ignition connections wiring and switches Wires can break from vibration near connectors Check and or swap out regulator e Check tank venting clunk position and fuel flow e Does fuel move towards the carb when the prop is flipped e f carb isn priming is choke plate closing completely Is the carb or carb mount loose causing an air leak Look for fuel seepage e ls throttle set at idle or slightly higher after motor foopsdand choke is opened 12 Make sure prop is flipped over with authority The ignition won fire at low speed If a lot of fuel drips from carb the motor might be flooded If so remove and dry or replace the spark plugs Try starting again without using the choke Other issues Fuel drips continually from carb Check that the pin on the center of the diaphragm is inserted in the metering lever fiorkQ Make sure there is no debris in the needle seat Remove needles and blow air into the holes RPM won go over 3 500 to 4 000 Check that the polarity of the connection between sensor and ignition is correct not plugged in backwards Broken prop bolts In order for bolts to shear some type of side loading movement is required If the bolts are tightened correctly nothing moves and prop bolts will rarely break It a good idea to replace prop bolts routinely Check your prop bolts regularly Excessive vibration Check that low rom needle setting is not too rich Check prop and spinner bala
14. when turning at thousands of RPM Check that your prop bolts are properly tensioned regularly Every flight is not unreasonable Thinner props may require using shorter prop bolts especially if not using a spinner back plate Make sure your prop bolts do not bottom out in the propeller hub Shorter bolts are available from Desert Aircraft Australia 10 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 ALWAYS BE PREPARED FOR THE MOTOR TO START ON ANY FLIP OF THE PROP 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 fpopsa 10 Open the choke 11 Set throttle to idle position carb butterfly plate slightly open 12 Flip the prop again until the motor runs 13 Let the motor warm up for 15 or 20 seconds before advancing the throttle Needle Adjustments e The needle farthest from the motor is the High Endoneedle The needle closest to motor is the Low Endoneedle Turning the needles clockwise flean
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