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Posted by VicT | Today @ 10:14 AM | 1,510 Views
The Arrows Marlin comes with no receiver and I chose the AR637T for it’s Forward Programming features, Telemetry, and AS3X /SAFE gyro features. I replaced the stock 40 A ESC with an Avian 45 A ESC for it’s advanced telemetry, ease of programming, and for reverse thrust. With a SMART 2200 4S the lipo sends info to the ESC then to the RX and then to the NX8 transmitter.

I have been using spoilerons on all of my models using the DX9 and NX8. However with flaps the DX9 requires the more complex sailplane type program. It can be done but the NX8 is so much easier because of the 2 aileron, 1 flap choice in the Airplane type program. In the Flap System menu (see pic) there are 3 columns: Flap, Elev, and Crow. I have assigned FM (transmitter Flight Modes) to various phases of flight.

I plug the right aileron into chan 2 and the left aileron into chan 6. The roll gyro levels the Marlin with just the right aileron and needs no adjustment in the gain menu. I use the default gains for all 3 axis and do not set up a switch or dial to adjust gains. Likewise I have been using the default angle limits for aileron, elevator, and rudder and the Marlin reacts normally. I am using 50% aileron to rudder mix for all phases of flight except for B2 Manual Mode where I want axial rolls without any rudder mixing.

Flight Modes are set up on the B, D, and Throttle Switch. B0 is SAFE, B1 is Circle Mode, and B2 is Manual Mode. The majority of my flying is in the B0 SAFE...Continue Reading
Posted by VicT | Jan 20, 2022 @ 11:01 PM | 4,055 Views
A fellow clubmember stopped flying his Avistar about 4 yrs ago. He was using a Rimfire 46 with 12/6 on 5S 6000 Graphene, YEP 120 amp ESC. Lots of power and speed but heavy at 8.08 lbs. 1387 watts so I wanted to reduce power and weight. She is down to 6.5 lbs and 645 watts using a 2200 4S 50 C pack and an Aerostar 80 Amp Reversing. ESC to reduce landing rollout distance. I’m looking forward to seeing how the 24% weight reduction does for endurance and performance.
Posted by VicT | Jan 05, 2022 @ 04:57 AM | 50,279 Views
To keep amps below the Avian 30 amp continuous (45 amp surge) I reduced the Graupner blade size from 10/8 to 10/6. I can’t tell the difference in the vertical climb speed and I am only using full throttle for 5-10 seconds to get to 400 ft. I set an altitude alarm on my NX TX telemetry menu for a 400 ft altitude that gets sent back from my AR 637T receiver. At this altitude I can glide, search for thermals or make 45 degree dives. The more I fly the Tori the more I like her as she has good speed and can thermal better than any of my foamy similar sized motorgliders (Radian, Radian Pro, Calypso, Conscendo, Conscendo Evolution. The Tori has thin wings and even with spoilerons the touch down speeds can be higher and the fiberglass to tailboom joint can crack as seen in the pic below. The nice feature is that you can see the crack and repair it where foam cracks are harder to detect but easier to repair. I can wrap clear packing tape a few times around the boom and be done with it or use 2 ounce glass cloth and Locktite CA professional or JB Weld black 24 hr epoxy. Tyvek white paper and CA is the same weight as 2 ounce glass cloth and is easier to cut compared to glass cloth. It’s easier to get also. For pics go to this link
Posted by VicT | Dec 27, 2021 @ 09:46 AM | 20,305 Views
I am using the Avian 30 A ESC in my Aeroscout with a 1300 3S SMART lipo and AR631 RX The battery symbol gives me a quick capacity level that is more accurate than a count down timer. My DX9 and NX8 get the same graphic symbol and also RPM, and ESC temps and flight pack volts. I tested a 45 amp Avian in Russ C’s Heron AR637T (8ch version) build that Dave A programmed with the latest software. Another 30 A Avian was tested good in a Secco motorglider using an AR630 RX in a Conscendo Advanced. No updated software but still shows good batttery symbol and telemetry.
Posted by VicT | Dec 02, 2021 @ 07:36 PM | 14,181 Views
I programmed the AR636 stock receiver that was installed in the 2018 June Nite version and noticed maximum bank angle of 90 degrees left and 60 degrees right. I don’t want to trust the 636 chip and will go to the AR637T chip for now as it has so many valuable features. The 85 degree down flap angle is great for vertical 45 degree dives to to the runway and with appropriate up elevator and timing a spot landing can be made with 5 training attempts for the newby club member. VicT
Posted by VicT | Nov 24, 2021 @ 01:30 PM | 14,256 Views
The 2 meter Tori has a very thin wing and even with ailerons angled up about 40 degrees (spoilerons) the Tori does not want to slow down even with a nose up attitude. This makes landings difficult. To reduce approach and touchdown speeds and to reduce the pilot workload I will be designing flaps. I prefer to make flaps lightweight but in this case I will be adding more weight than is needed. The advantage is that this heavy approach is easier and quicker and the stock red white and blue covering does not get disturbed. I have used credit cards and 1/32” ply for flaps but this time I will be using G10 fiberglass plate that is stiff and keeps it’s shape so that when the flaps are flush with the bottom of the wing there will be no gaps. A torsion spring will keep the flaps flush and a digital metal gear flap servo will pull the flap down into position. I have used this design with only one flap servo but will be using two servos this time.
Posted by VicT | Nov 22, 2021 @ 08:39 AM | 11,123 Views

The above link is from the General forum discussion on the best wheels/tires for reducing bouncing during touchdowns. The B777 probably has the most expensive and sophisticated design to minimize bouncing. Commercial and military pilots are trained to touchdown at fairly consistent rates of descents which helps designers solve the problem. However RC flying is more difficult due to lack of visual cues and lack of oil filled shock absorbers.

RC pilots spend more time trying to make the perfect landing using different models in the same 2 hour flying session. Different models require different techniques and can lead to frustration. Sticking with one design helps to improve the best technique.
Posted by VicT | Nov 15, 2021 @ 11:50 PM | 7,560 Views
I want to reduce my workload by using one switch to extend and retract the gear and flaps for my AT6 Texan. I programmed an Eflite P-39 some time ago and it worked out fine. The AT6 has flaps on ch 6 ( D switch) with D0 being flaps up, D1 takeoff flaps, and D2 landing flaps. The retracts were on ch 5 (C switch) but I removed the plug and put the retracts on the flap ch6 (D Switch) using a Y cable (see pic). Ch 5 is now open for a second aileron servo, or a motor reversing switch, or a bomb drop switch. However operating the gear and flaps are now on 1 switch which reduces pilot workload during these critical phases of flight. Here is my operation routine.

I put the AT6 fuselage in my plane holder and connect the wing to the fuselage. I turn on my TX with gear and flaps up and then plug in my flight pack. I then check the gear and flaps by first moving the D switch from D0 to D1. I check to see if the flaps go to the take off position. Then I move the D switch down to D2 and see the gear extend and the flaps move from take off to landing. I move the switch from D2 to D1 and the gear stays down but the flaps retract to the take off position. I put the Texan in take off position and after take off move the D switch from D1 to. D0 and both the gear and flaps retract. If I want to fly slow I move the D switch to D1 and only the flaps come down to the takeoff position. When ready to land on short final I move the D switch from D1 to D2 and the gear...Continue Reading
Posted by VicT | Nov 05, 2021 @ 09:12 PM | 20,650 Views
Checklists were developed so that a two pilot crew could catch errors when thy prepare for flight. Our DX, iX and NX transmitters have pre flight checklists that take some time to construct but they remind us of the specific model and program need to know items.

Distractions are our biggest enemy and any error trapping that can help us catch errors is welcomed. At our club there have been occasions when experienced pilots have taken off in the experienced or manual mode where immediate an unrestricted roll and pitch attitudes happen with in 5 seconds of throttle. In most case this results in a surprise crash in 5 seconds. If you put the TX down and do not move anything you can analyze if the TX switches were the cause. In the last 5 yrs with BNF models being the most popular and SAFE being accepted as the easiest and safest way to fly ..... taking off with SAFE Select Off has been the root cause off the crash. Here are some measures to reduce this pilot error.

Most beginners want to perform aerobatic maneuvers such as loops, rolls, and inverted flight. They may or may not want to learn from experienced pilots so they choose to select SAFE Off for their experimentation. However distractions can lead to taking off with SAFE selected off with no warning. Using the Warning menu of the Spectum D
X, iX or NX transmitters can warn pilots of this condition when ever they turn their TX on or select a model. In the Warnings menu shown I have selected...Continue Reading
Posted by VicT | Oct 05, 2021 @ 03:50 PM | 14,166 Views
Mike’s Conscendo Evolution uses a stock 30 amp ESC that includes an orange iC3 connector intended for SMART lipos with the matching male orange iC3 connector plug. However if you do not have a SMART battery other 3S1300 packs with the EC3 connector will work but an adapter is required . The blue adapter appears to fit but does not make metal contact with the negative and positive connections because the male parts are too small. You can enlarge the male connectors inside the blue adapter to make proper electrical contact. However if you fail to do this a loss off power will cause complete loss of motor and servo control. This is an intermittent power on power off situation that is difficult to see. A better solution is not to use the blue adapters at all. This will require you use an a different adapter or use a SMART lipo pack with an orange iC3 style plug. The problem is not isolated to the Conscendo but with any BNF Horizon model that requires the blue adapter plug.

After using a Smart 1300 3S pack that matches the smart ESC connector a 10 minute flight was performed to monitor Fades and Holds. There were only 50 or so Fades ( 100 holds/minute is normal) and no Holds. This confirmed that proper electrical connection was maintained during the flight.
Posted by VicT | Oct 02, 2021 @ 09:26 PM | 14,053 Views
The Sig Kadet Senior with the Eflite 60 on 6S and a 3 bladed 11/6? Climbs nice and we get 10 minutes of flight. The Spoilerons allow crosswind taxi with out wing lifting and approach and touch downs are with a higher angle of attack that minimizes bouncing. However on full power go arounds the prop wash over the fin causes an immediate 45 degree left yaw. Rather than removing the motor and experimenting with shim/washers and then remounting the cowl I decided to use NX8 mixing to mitigate the problem.

I set up 2 switch positions to test out. With F0 there is no throttle to rudder mixing. With F1 there is 30% throttle to rudder mixing that deflects the rudder to the right about 10 degrees. With F2 there is 60% throttle to rudder mixing which results in about 20% right rudder deflection. After flight testing I should be able to fine tune up or down the two mix curves. When I find the right numbers I will take the mix off a switch and have it permanently on. See screen shots for more info
Posted by VicT | Sep 25, 2021 @ 04:28 AM | 14,646 Views
I tried a fiberglass and wood Sport Jet kit back in 2000 on an asphalt runway. However minor dips in the runway resulted in pre mature lift off below minimum control speed that resulted in take off crashes. I used stomp launchers but put the model away until EDF design improved. The Marlin is a big improvement that has rugged gear and can be hand launched if desired. I want wheels!

The Marlin “trainer jet” has quicker acceleration but still has no shock absorption for take offs or landings.

The stock Marlin wheel tires are hard and offer no shock absorbing for take offs or touchdowns. The result is a bounce that creates a crash condition either below minimum controls speed or while accelerating to minimum control speed during take off or go around. Unlike full scale aircraft and RC automobiles with hydraulic shock absorbers our fixed wing RC models (with some exception) have no shock absorption. Low Bounce wheels such as the Du-Bro Cat.No. 175T offer shock absorbing action that mitigates bouncing. You can remove the landing gear and hand launch but this may not be your style of operating this EDF. The Marlin has fixed gear and has no risk of retract failure which is an advantage to the design.

Pry off the C clips with a sharp awl or pin in an area that you can find the clip if it flys off. Putting the gear in a clear baggy can help capture the c clip.

Remove the stock wheel and fit the 1.75 “ wheel onto the axle. Note that the stock axle is much smaller than...Continue Reading
Posted by VicT | Sep 08, 2021 @ 09:51 PM | 18,679 Views
I purchased the Tori Arf 2 m because of the fiberglass fuse and thin balsa built up poly wings with ailerons. The included Great Planes 10 motor and 40 amp ESC were measured with a 11/8 Super Carbon fiber folding prop mounted on a 38/4/8 BB aluminum folding spinne. The ESC must see full throttle then idle for normal operation. The brake works and .....With a 2200 Gold Racing 3S 35 C I measured 492 w, 46.7 amps, 10.4 volts. This exceeds the ESC so a smaller prop will be used for initial testing. A backup battery and diode will take over for ESC failure. Testing will include trimming a d flutter testing with flaperons using a NX8 and 637 T receiver.

The stock elevator and rudder pushrod screw clamps had too much play so we’re repack with .047” music wire keepers. The .047” wire was used to drill out the 2 horns. Wire was wound to allow sliding on the pushrods. After centering rudder and elevator they will be secured with solder.

The program was copied from the Conscendo spoileron program.
Posted by VicT | Sep 01, 2021 @ 08:55 PM | 27,253 Views
Don C has been flying with me on wireless buddy box after a 37 year leave of absence. He has 10 good flights with his Aeroscout S 1.3 and an. E flight Mustang is on his bucket list. He bought a Valiant as a next step up before E flight retracts and I have maidened and trimmed the Valiant for training. I made some modifications from my experience with two other Valiants and countless training flights. I made a top battery hatch, moved the gear forward and made a hoist/CG checker.

While all 3 mods are worth the time and effort to me the hoist is the easiest and most used. You will need a wire coat hanger and some plyers.

The hoist is great to hang the model from a garage ceiling or mini van ceiling. It fits two fingers for carrying out to the runway or back into the pits. You can check the CG with one hand. The manual states 65 mm plus or minus 3 mm from the leading edge. I marked this on the plastic wing joiner with a CG symbol. I used .068 inch music wire for the handle but coat hanger might work. See the diagram for dimensions. I used 50 pound fishing line for a loop that slides along the handle for an accurate CG measurement. The two wing panels can be separated. See pics
Posted by VicT | Aug 19, 2021 @ 06:57 PM | 29,254 Views
Mike and I lost control of his Conscendo Evolution while it was flying north 100 ft AGL (above ground level). She continued to glide north about 500’ into a swamp.

The cause of loss of control is suspected to be a loss of power to the receiver from the battery to ESC connection or from the ESC to receiver connection. It takes about 8 seconds to get full control on the pre flight table and this is with a perfectly still model. If the model is held by hands then the minute movement may take longe. So in flight if there is an intermitttant loss of power the model will continue flying far away.

Fail Safe can prevent the model from flying straight away. The BNF receivers such as the AR637TA can be set up during the bind process to provide a gliding turn with the motor off. Forward programmed receivers such as the AR637T have a specialized procedure to designate angles for pitch and roll. Here is how I programmed Fails Safe using the AR637TA reciever in the BNF Aeroscout 1.1

After take off I used full aileron left trim and full up elevator trim. With power off this gave me a nice descending left hand turn with about 20 degrees left bank and 5 degrees nose down. You can recenter the trims for landing or use aileron and elevator to land the model. On the ground I rebound the model with those trims set. After binding I put the trims back to center. To confirm Fail Safe I turned off the transmitter ( by the power switch or System menu) and...Continue Reading
Posted by VicT | Aug 17, 2021 @ 10:51 PM | 23,344 Views
My first fly away model was a $500 Hobby Hawk glider in 1982. I used a glow power pod to climb to about 1000 ft and after 10 minutes of soaring there was no control. I figured it was the 10 year old 4 cell Nicad battery pack that gave out. Since then I have tried to keep preventative maintenance a top priority.

Today I was instructing with Mike’s Conscendo Evolution. She had an upgraded Art Hobby Spinner and 10/8 Graupner prop and reinforced fuselage using fiberglass. The two long antennas from the AR 637TA were aft off the receiver and inside the foam fuselage with holes made from a 1/8 “ diameter pointed stick. There is no way to put one of the antennas at 90 degrees unless a hole or tube is made for one of the wing panels.

We had about 5 minutes of getting familiar with the spoileron program switching from Instuctor to Student. Mike was about 6-800 ft away and could not turn. He said he had no control so I took over and I could not turn and I could not climb with elevator and the motor did not work. The Conscendo headed over the north tree line until it obstructed our line of sight. I looked down at my NX8 and noted normal flight pack telemetry voltage and signal strength. There were no holds and only 445 fades in the 5 minutes of flight. I got out my Iphone and went to Google Maps to draw the last heading into the swamp area. I texted Mike the pic with the heading highlighted. I then notified the 3 persons that we use to search and...Continue Reading
Posted by VicT | Aug 04, 2021 @ 09:09 AM | 38,864 Views
I had a crash on the Geotech runway right after hand launch . The fuse broke at the leading and trailing edge of the wing saddle. There was no damage to the prop spinner or motor and radio system. It’s been 6 weeks waiting for a Replacement fuse so I decided to repair. I used Locktite Pro ca to glue the pieces back in place. After lightly sanding with 100 grit paper I used an Olfa wheel cutter to cut out 6 oz glass cloth. After placing the patch on the fuselage I squeezed ca on to the cloth and then pressed down with clear Monocote backing until the reaction cooled down. The tail seam is a known weak area so I reinforced that area as well. Compression wrinkles on the left nose area indicated left side thrust when I put a 20 inch brass tube on to the 4 mm motor shaft. I used the same tube on a new fuselage and no side thrust was indicated. Some down thrust is stock but was not measured. I used washers on the left side of the motor mount to restore the thrustline to neutral. A Canada Dry green soda bottle was used to make a canopy and cowling. Gorilla glue was used to secure the cowl to a 1/8 inch ply firewall....Continue Reading
Posted by VicT | Jul 25, 2021 @ 11:37 PM | 14,734 Views
This is a new BNF Aeroscout S 2 1.1M BNF BASIC from the Brandon Fl Hobby store for $149,99. After unboxing I used a 3S1300 SMART lipo to Bind my NX8 to the model. After confirming SAFE could be turned on and off I taxied her on the street to check tracking and she tracked great.

This Scout will be a club trainer using my NX8 TX on wireless training for other pilots that have the NX6 or DX transmitters.

Since most pilots do not want to remove the wings I glued the bind plug to the side of the fuselage to make it easier to bind. Yes you can use the included bind cable after removing the canopy but I prefer the side mount. Its easy to leave the bind plug installed and fly off then crash when someone in the pits binds their model. I tie a string or colored tape to the bind plug so I can see it hanging from the side of the fuselage. It’s easy to see when taxiing for take off. I sand the black plastic connector and use just a toothpick of CA on the plastic to secure it to the foam.

I make a lanyard for the canopy as eventually it will depart the fuselage and you will have to make or buy a new one.

I use an old credit card cut down and sanded to act as a guard to protect the elevator and rudder servos.

The black velcro can be made easier to use if a colored string is glued or tied to the end of one strap.

The stock tires and wheels are nice for rough terrain. However the center of mass is high and eventually the Scout will end up...Continue Reading