Back to Basics Tech tips for engine & radio installation

Back to Basics Tech tips for engine & radio installation

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Persevering with our constructing venture for the Phoenix Mannequin Sonic Mk II low-wing sport flier, we get again to the fundamentals. In our “Construct it Proper” article within the August 2021 difficulty, we went from elements within the field to a very assembled airframe.
With this text, we’ll spotlight the set up of the facility system consisting of the O.S. Max .25 two-stroke glow engine, its motor mount, the gasoline tank, and the gasoline strains. We’ll additionally set up the receiver and the remainder of the servos within the airplane to manage the rudder and elevator, and connect all of the management linkages. Let’s get began.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

ENGINE INSTALLATION

The Sonic ARF comes with a composite engine mount, and it’s molded in two items in order that its width could be adjusted to accommodate a wide range of engines. The 2 back-plates overlap and might slide backwards and forwards, altering the gap between the 2 rails. Slip the 2 halves collectively after which place the engine in the midst of the rails in order that it suits between the 2 facet webs.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

After getting the engine-mount elements “sized,” take away the engine and place the again of it on a flat floor; press the elements collectively in order that the again is flat with the 2 items flush to one another. Now add a few drops of skinny Zap CA glue, and spritz with slightly Zip Kicker to carry the elements collectively.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

To connect the engine to the engine mount, you first should drill holes into the rails and use the included screws to safe it into place. Place the engine on the engine mount in order that the engine’s attachment tabs are in the midst of the rails, then use a pointy pencil to switch the places of the outlet onto the tops of the rails.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Utilizing a 3/32-inch drill bit, fastidiously drill the 4 holes. Be sure to drill the holes in order that they’re straight vertically and sq. to the rail tops.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Use the 4 2mm x 3/4-inch-long self-tapping screws; insert one by one, and screw them into place a couple of quarter inch deep to begin the threads. Then take away them.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

There are 4 lengthy 4mm screws that maintain the engine mount in place. Insert the screws into the mount and thread them into the blind nuts put in within the firewall. If there are any burrs, it might be troublesome to string the screw into place. Change the blind nut with a brand new one. As you thread the screws into place, add a small drop of Zap thread-lock on the top of the screws, and use a crisscross sample to tighten the screws snugly into place.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

With the engine mount safe, connect the Z-bend finish of the throttle pushrod to the engine’s throttle arm, and place the engine on the mount whereas slipping the pushrod into the information tube. Reinstall the engine on its mount, and tighten the attachment screws snugly into place. (Observe: To stop damaging the gasoline line connecting the carburetor to the needle-valve meeting, take away it earlier than screwing the engine in place.)

TECH TIP 1

Though the included {hardware} is greater than sturdy sufficient for the job, it’s possible you’ll discover it simpler to exchange the engine attachment screws with 2mm cap-head screws so as to use a ball-driver Allen wrench to string them into place. With fixed use, the slots in Phillips-head screws will usually start to wear down.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

FUEL TANK

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

The Sonic ARF comes with a gasoline tank and its stopper and outlet tubes, however you need to provide the gasoline line. Any glow gasoline tubing will work, however I’ve discovered that the brand new ProFlex Common Gasoline Line works extraordinarily nicely. It doesn’t harden over time and is extraordinarily versatile, which helps forestall it from slipping off of the gasoline fittings.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Test the opening of the tank to see if there may be any sharp flashing current. This might minimize into and harm the rubber stopper. If there may be, use a pointy pastime knife to chop it away, producing a slight bevel on the inside edge. Minimize a bit of the ProFlex gasoline line to size in order that, while you slip it onto the outlet tube, it’s about half an inch shy of reaching the again of the gasoline tank. Slip the steel gasoline pickup “clunk” into the top of the pickup line after which slip the stopper into place to examine the pickup line’s size. With the stopper pushed all the best way in, the clunk needs to be about 1/4 inch shy of hitting the again of the tank. If it touches the underside, take away the meeting and shorten the pickup line.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

The ProFlex gasoline line comes with skinny items of wire that you simply wrap round and twist into place across the neck of the clunk. Utilizing long-nose pliers, twist the wire tightly into place in order that it clamps across the line, then snip off the top in order that about 1/8 inch stays. For the reason that outlet and bent vent tubes are made out of plastic, don’t use the clamping wire at these line attachments. Don’t connect any gasoline tubing to the within of the vent tube.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

The highest of the tank is closest to the stopper and tank neck. Insert the gasoline line and stopper unit into the tank, and place it in order that the vent tube is on the high of the tank, then tighten the screw till the stopper is tightly safe within the neck of the tank. You shouldn’t be capable of twist or flip the stopper.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Earlier than putting in the tank within the fuselage, minimize two lengths of gasoline line about 6 to eight inches lengthy and slip them onto the gasoline outlet’s tubes. Add some tape to the vent line, and determine it with a “V” to assist forestall attaching the gasoline line incorrectly to the engine.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

To put in the gasoline tank within the fuselage, loop two heavy-duty cable tie-wraps underneath the fuel-tank tray by means of the facet notches in order that the ends prolong out of the fuel-tank compartment.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Slip the tank into the fuselage, and push it again in order that the entrance can clear the entrance of the hatch opening. Insert the 2 gasoline strains by means of the opening within the firewall, and pull them out as you slide the gasoline tank ahead. The neck and stopper of the tank suits into the firewall opening. Add a second tie-wrap to every of the opposite two, and tighten them in order that they maintain the tank firmly into place.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Snip the ends off of the tie-wraps, then trim away some materials from the underside of the hatch cowl in order that it clears the tie-wraps. The hatch cowl is held in place with a spring-loaded latch.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Permit about 2 inches of extra size and minimize the fuel-supply line to size, and slip it onto the gasoline becoming on the again of the engine.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Set up the muffler on the engine, securing it with two black machine screws and lock washers, and join the vent line to the muffler’s stress becoming, additionally permitting a few inches further size.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

To finish the power-system set up, all you need to do is set up the included spinner and a High Flite 9 x 5 Energy Level propeller. The opening within the spinner backplate needs to be enlarged barely in order that it slips over the engine’s prop shaft with little to no play. Place the backplate towards the engine’s thrust washer and the slip the propeller in place, adopted by the prop washer and prop nut. Tighten the prop nut down snugly, then give it one other quarter flip to actually tighten it into place.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

There are two molded-in prop guides within the channel across the backplate, which the lip of the spinner entrance suits into. The propeller needs to be positioned in between these guides in order that the blades match within the spinner cutouts. Place the entrance of the spinner in place after which screw it to the backplate with the 2 2mm x 1/2-inch screws.

RADIO INSTALLATION

The following factor to sort out is the set up of the management linkages for the elevator, rudder, and throttle, together with their servos and the remainder of the radio gear. Once more, as we talked about within the final difficulty, all of the grommets and brass inserts should be put in appropriately within the servo-mounting tabs. Plug the servos into the receiver, and energy up the transmitter and receiver to middle the servo output shafts. You must also jot down which servos connect with which receiver ports. With the Tactic TTX650, the aileron lead mates with port 1, the elevator plugs into port 2, the throttle goes into port 3, and port 4 is for the rudder. As soon as that is completed, we are going to set up the servo arms after we work out the management linkages and attachment factors.

SERVO INSTALLATION

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Earlier than putting in the servos it’s a good time to put in the rudder and elevator management horns and the wire pushrods. You’ll have to minimize away the protecting from the information tube exits so you may slide the pushrods into place. Screw the clevises to the threaded ends of the wire pushrods and you might be able to go. Contained in the radio compartment there’s a servo tray glued into place. Utilizing the instruction booklet as a information, place the servos as proven. I discover that including one servo at a time after which including its management linkage is the best technique to work within the confines of the slim radio compartment. You take away the wing after which work by means of the open wing saddle.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

I began with the sideways-mounted throttle servo as it’s a tight match and the tray wants slightly trimming to clear the servo leads. Utilizing a pointy pastime knife, notch the servo opening as proven; this permits the wires to be routed underneath the tray with out pinching.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Whereas holding the servo in place, use a 1/16-inch drill bit and drill by means of the servo grommets into the tray; screw the servo into place.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Middle the rudder, and mark the pushrod for the servo-arm gap location. Bend the pushrod 90 levels at this mark, then connect it to the servo arm with a pushrod keeper.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Subsequent, set up the rudder servo. It is advisable to use the twin servo arm because the servo will management each the rudder and the nosewheel steering. Place the rudder servo in order that the holes within the servo arm align with the wire pushrod and the steering linkage for the nosewheel. Whereas holding the servo in place, drill the holes and screw it into place. For each the throttle and the nosewheel steering linkage, threaded linkage connectors have for use. These have threaded studs and locknuts used to connect them to the servo arms.
You’ll have to enlarge the holes within the arms utilizing a 1/16-inch drill bit. Insert the stud within the arm, and with one locknut above and beneath the arm, use two long-nose pliers to tighten the connector into place. There are holes within the sides of the connectors that settle for the management linkages, and on the highest is a setscrew to safe the linkage into place. Middle the servo, then alter the nosewheel in order that it’s centered pointing straight forward; tighten the setscrew.

TECH TIP 2

With ARF fashions just like the Sonic, the servo trays are sometimes made out of softer wooden, equivalent to laminated balsa or gentle plywood. After you drill the servo-mounting screw holes, add a drop of skinny Zap CA to every gap. This can soak into the wooden and harden it the place the holes are drilled, giving the screws a stronger “chunk,” which helps forestall the screws from stripping out the holes.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

ELECTRIC POWER

Because the Sonic is designed to make use of both a glow engine or an electrical energy system, listed below are a few images to indicate the e-power setup. The mannequin additionally comes as a part of the {hardware} package deal, with all the mandatory elements to put in an electrical motor. These embody all of the aluminum standoffs and screws wanted to connect the electrical motor. For the Sonic, an ElectriFly RimFire .25 is beneficial together with an ElectriFly 30A to 40A velocity management. The wiring is simple as it’s a plug-and-play and the velocity controller is connected to the standoffs behind the mannequin, out within the breeze for considerable cooling. For the reason that gasoline tank will not be wanted, the tank tray is the place the 3S 2000–3000mAh LiPo flight pack is put in. To pick out the correct e-power propeller, examine the directions that include the motor.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

THROTTLE LINKAGE

The throttle servo is completely different from the remainder of the servos because it doesn’t relaxation within the centered place. To put in the throttle linkage correctly, you first have to make use of the transmitter and produce each the throttle stick and the throttle trim all the way down to the idle positions. Usually, the throttle arm on the carburetor has a comparatively quick journey, so you need to use a brief servo arm, or you should utilize the second-to-last inside gap within the arm because the attachment level and minimize the servo arm in order that it clears the facet of the fuselage.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Set up the linkage connector after which insert the throttle pushrod. Pull the linkage again in order that the carburetor closes totally, and tighten the setscrew on the high of the connector. Transfer the throttle stick all the best way ahead and examine the motion of the carburetor’s throttle opening. It needs to be totally open with the stick all the best way ahead; if it isn’t or if the pushrod strikes too far and bows barely on the full-power place, you may alter the servo journey later in order that there isn’t a binding within the linkage.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

The elevator servo and linkage is the following one to do, and it’s completed in the identical approach because the rudder servo. Place the servo, utilizing the arm as a information in order that it doesn’t contact the fuselage facet, and drill the holes and screw it into place. Middle the elevator place, align the pushrod with the servo-arm attachment gap, and mark the pushrod wire. Bend 90 levels on the mark, and connect the pushrod to the arm utilizing the keeper to safe the linkage. At this level, you may activate the radio system and examine the motion of the servos and the management surfaces and linkages. There needs to be no binding all through the servo arms’ motion.

RECEIVER AND BATTERY PACK

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

There’s a sq. opening within the facet of the fuselage, and that is the place the radio energy swap is put in. There are additionally two holes on the sides of the opening, and you’ll pop them open with a small screwdriver.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Take away the swap cowl, and place it with the “off” place going through the rear of the airplane. Insert the swap harness from inside, and screw the swap and swap cowl collectively.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

For a little bit of security throughout flight, use a bit {of electrical} tape and safe the battery pack’s result in the swap harness feminine connector. This can forestall vibration from inflicting the wires to return aside. Wrap the battery pack with 1/8-inch-thick packing foam, and safe it in place with two lengths of tape. Place the pack within the backside of the radio compartment in entrance of the servo tray. Test all of the servo leads in addition to the switch-harness connector, ensuring they’re correctly and fully plugged into their receiver ports.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Place a 1-inch-thick piece of packing foam over the battery pack. This piece needs to be oversize by about half an inch in order that it stays in place when inserted into the radio compartment. Place the receiver within the middle of the froth. Utilizing one of many wire wraps that comes with the brand new servos, collect and bind the servo leads collectively. This retains the radio set up neat and helps forestall any of the servo leads from getting chafed by the servo linkages.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Place one other piece of 1-inch foam over the receiver, ensuring that the twin antennae, the charging plug, and the aileron Y-harness are all accessible.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

There are two antenna leads with the Tactic receiver, and so they should be put in in order that the 2 outer ends are positioned 90 levels to one another. The best approach to do that is to drill small holes within the sides of the fuselage and information them by means of to the skin. Pull one all the best way out, and tape it to the skin of the fuselage in order that it factors to the tail. Make sure to not have any pressure on the antenna the place it’s linked to the receiver.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

For the opposite antenna lead, insert it within the gap on the opposite facet of the fuselage in order that solely the very finish of the antenna is uncovered and it factors 90 levels from the fuselage facet.

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

Use just a few dabs of Zap Cover Glue to safe the antenna leads the place they undergo the holes, and let dry. This glue stays versatile when cured and holds the antenna leads in place, however it’s simple to take away in a while.

FINAL ASSEMBLY

Model Airplane News - Membership | Back to Basics Tech tips for engine & radio installation

All that’s left to do is to attach the aileron leads popping out of the wing to the Y-harness after which connect the wing to the fuselage. Be sure to push the wire leads again into the holes within the high of the wing, and ensure to not pinch the wire leads between the wing and the wing-saddle sides. When every little thing is aligned, tighten the 2 wing attachment bolts. You at the moment are completed constructing your Sonic ARF sport aircraft.

Backside Line

In order that’s it, our Sonic is able to go. All that’s left to get it able to fly is to interrupt within the engine, and make the ultimate radio and servo changes with the Tactic radio’s programming. However that’s one other story. The duties and strategies proven on this article are relevant to most any ARFs accessible right now. In case you have any questions, we’d love to listen to from you. E mail us at MAN@airage.com.

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