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This thread is privately moderated by Red.Sneakers, who may elect to delete unwanted replies. |
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Did your model require any ballast weight to tune the CG? I'd like to find something sailplaneish this size powered with a straight ailerons but I don't think theres much out there. |
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That is the million $ question asked by many. The umx Radian is one of the few models that I have (twice) gone from the store to the field, done a quick visual check & flown. Bottom line is, if you know what may cause a plane to porpoise & how to control it in flight, you will enjoy the Radian much more.
I only started to check the CG when I wanted to carry additional cargo, i.e. flight logger & camera. Other than that, never did worry about it. You just fly the plane & adjust the battery position if needed for best performance on any given day. For longer flights & wind surfing, using a 220 mah battery helps. |
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To actually tune the Micro Radian for best L/D you need to turn the AS3X off on the gear channel. Unfortunately Horizon didn't make this easy, you need to pull the plane apart to get to the receiver/broad.
I put it on a switch to the radio so it can be turned on or off. It's a much more fun plane to fly when the AS3X is off. But if you get it right the plane will literally fly by its self with the AS3X turned on. Bring a lawn chair... Have fun tuning... |
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Thanks for the great collection of links, Red! Will definitely do the magnet mod, and hopefully some painting too.
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Last edited by Brainstorm; Jun 08, 2015 at 03:30 PM.
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The little 1S 150mAh packs are painfully fickle to manage. I find that I regularly over-discharge them, esp. when flying FPV with the VA1100 micro FPV cam. And they're impractical to get to storage voltage for safekeeping. I'm also hoping to get longer flight times. In a perfect world, I'd like to find a slightly larger motor glider with a small brushless motor that flies on 2S 950mAh packs (or 3S 500-600mAh). Any suggestions? For now, I'll keep trying to work with the UMX Radian, because I like it enough and it's what I've got. Today was very windy. So I decided to try flying with an old 1S 500mAh LiPo from my Blade mQX brushed/geared mini quad. I've been meaning to do this to get longer flight time and see if the extra weight will help in windy conditions. I rigged this up with the mini-JST adapter that comes with some Blade chargers. Not elegant, but good enough for initial testing. I attached the 500mAh LiPo with a wire-tie that I hot-glued into the battery bay, but which ended up not sticking. The 500mAh pack fits just right, although there's no wiggle room to adjust COG. I think the UMX Radian flew alright with the larger 500mAh LiPo. However, I had to stop early because of a loose connection. So I didn't get to measure maximum flight time. I am now thinking about switching my UMX Radian over to a JST connector (or a Hubsan/micro Losi connector), so I can fly with larger LiPos that also have a short lead. What do you guys think? |
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Latest blog entry: Explore new (old) forms of flight! :)
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Eflite UMX Radian 2S Brushless w/ Dual Servo Ailerons Maiden Flight
Greetings! Thought I would share my latest project since this is a UMX Radian Mod Thread:
This is the Maiden Flight of my Eflite UMX Radian 2S Brushless with Dual Servo Ailerons (This video is best viewed in Full-screen and in HD). Bonus Flight Footage at the end of the Maiden Flight.
This project is my response from losing my first UMX Radian about the same time last year due to a sudden incoming wind storm that blew my first UMX Radian with it's stock brushed motor system backwards out of the flying field, across the highway, past several neighborhoods, and finally out of view and range. After searching for hours, I finally considered the plane lost. I told myself, never again will I lose a plane due to the lack of power to come back. The project started with taking photos of the stock system for reference. Maintaining the identical amount of right thrust and down thrust was critical for it's flight performance. After studying the stock layout, I carefully removed the stock receiver and brushed motor and motor mount with an Xacto knife. Using a Dremel, I carefully hollowed out the interior to make room for the new UMX Yak 54 motor mount, new Eflite BL180 2300Kv brushless motor and new Spektrum EFLU4864 6-channel AS3X receiver BL-ESC. The UMX Yak 54 motor mount was used due to its ideal size (after cutting down some of the mounting base perimeter). I chose to use the Eflite BL180 2300Kv motor due to the robustness of its design, silent operation (compared to its 2500Kv and 3000Kv variants), and low energy consumption. The Spektrum EFLU4864 AS3X receiver BL-ESC was used for this conversion as it suited the needs of the conversion, allowing brushless power, full 4-channel control (adding ailerons), along with AS3X stability right out of the packaging (no additional programming of the receiver was required). After dry-fitting the pieces, the UMX Yak motor mount, Eflite BL180 2300Kv brushless motor, and Spektrum EFLU4864 6-channel AS3X receiver BL-ESC were all glued in using GE Type II silicone. For proper elevator and rudder control rod fitment with the new receiver, the elevator and rudder control rods were cut by about 10mm, re-bent, and then re-fitted to the new receiver. All glued pieces were left overnight to dry. The next step was to address the main wing modifications. I wanted a wing that would withstand the rigors of 2S Brushless Flight, but with Ailerons. I installed a 14" .070 carbon fiber rod spar overlapping the stock rod spar for increased rigidity. Then I carefully measured out from the center line two ailerons measuring 17mm x 130mm, indenting the foam with the end of a Phillips screwdriver. I also marked (3) locations for 5mm hinges on each aileron. Using an Xacto knife, I carefully cut the ailerons out and then bent them back and forth until they were moving freely. Then I overlayed 5mm pieces of hinge tape on both sides of each hinge, and again moved the hinges back and forth to ensure free play. Then I installed the control horns of a UMX Beast 3D on each aileron. Using a small square balsa wood rod, I cut and created mounting bases for the Spektrum 2.3 gram linear long throw offset servos, and glued them on each side of the main wing using GE Type II silicone. Spare UMX Beast 3D aileron control rods were used to connect the servos to the horns. I knew that this particular model had an intrinsic nature to be stable and would resist aileron forces, possibly inducing adverse yaw, so I also programmed a near 1:1 aileron / rudder deflection 85% mix to counter those forces. After one test flight, I concluded that my "hunch" was correct as the aileron-rudder mix provided the most dialed-in feeling, allowing graceful rolls to be executed. The final touches to this project was adding a robust .050 carbon fiber rod spar to the thin horizontal stabilizer. No rod spar was added to the vertical stabilizer as it was a much thicker foam. Adding the orientation striping on the main wing was also a necessity to keep orientation for the higher altitude flights. To complete the look of the UMX Radian, a UMX Carbon Cub SS nose spinner was installed. The Eflite 5 x 2.75 prop was then dynamically balanced thereafter. Finally, the bottom of the fuselage has been protected with Scotch tape to prevent staining from repetitive grass landings. Using the Eflite 2S 200mAh 30C lipo battery placed aftmost in the stock battery tray, the updated center of gravity (CG) is 24mm from the leading edge of the main wing. All-Up Weight (AUW) is 67 grams. Standard Target Flight Time of 5 minutes (for my mental focus) was dialed in, however longer flight times are easily achieved with glides, thermals, and wind currents. This project has been my most extensive one to date. This new UMX Radian had been sitting in my closet waiting for the day for me to feel experienced enough to undertake the conversion. Despite the fact that weight has increased from the stock parameters and that the propeller is no longer folding (no folding propellers are available for the prop adapter fitment at this present time), my Eflite UMX Radian 2SBL w/ Dual Servo Ailerons is an outstanding performer, capable of long glides, catching thermals and wind currents, now modified with full 4-channel control for increased aerobatic flight (Rolls) and 2S brushless power to come home. VIDEO HIGHLIGHTS Loop 1:12 Hammerhead 1:25 Right and Left Roll 1:50 Double Roll 1:58 Loop 2:11 Power-Off Glide 2:27 Roll 3:33 Loop 3:58 Roll 4:31 Loop to Descending Roll 4:48 Hammerhead 5:02 Close Pass to Throttle-Up 5:53 Various Rolls 6:10 Double Roll 7:06 Landing Approach 7:24 Bonus Flight Footage (Loop to Double Roll, Wind Current Glide, Roll to Inverted Flight) 7:51 MODIFICATIONS / UPGRADES Motor: Eflite BL180 2300Kv Brushless Outrunner EFLUM180BL Propeller: Eflite 5 x 2.75 Propeller EFLUP050275 Receiver: Spektrum 6-Channel AS3X Receiver BL-ESC EFLU4864 Mount: Eflite UMX Yak Motor Mount EFLU5030 Spinner: Eflite UMX Carbon Cub SS Spinner EFLU1108 Main Wing Reinforcement: .070 Carbon Fiber Rod Spar (14") Custom Aileron System: (17mm x 130mm per Aileron) Aileron Servos: Spektrum 2.3 Gram Linear Long Throw Offset (2) SPMSA2030LO Aileron Control Horns: UMX Beast 3D Control Horns Aileron Control Rods: UMX Beast 3D Control Rods Horizontal Stabilizer Reinforcement: .050 Carbon Fiber Rod Spar Transmitter: Spektrum DX6 Mix: Aileron - Rudder Mix 85% Battery: Eflite 2S 200mAh 30C Lipo Timer: 5 Minutes / 7+ Minutes Total Flight Time (Throttle / Glide) Lipo Post Flight Final Voltage: 7.60 Volts / 8.40 Volts (35%) Camera: iPhone 6 at 1080P / 60 FPS Headmount: http://www.amazon.com/Mount-Smartpho..._detailpages00 Thanks for watching and if you haven't already please click the Thumbs Up and Subscribe! ImagesView all Images in thread
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Last edited by Blaze0021; May 23, 2016 at 04:47 AM.
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Eflite UMX Radian 2S Brushless w/ Ailerons Stryker Powerplant Performance Flight
This is the Performance Flight of my Eflite UMX Radian 2S Brushless with Dual Servo Ailerons outfitted with the Parkzone Ultra Micro F-27Q Stryker Powerplant (Eflite BL180 3000Kv Motor / Stryker 3.75 x 3 Prop). This video is best viewed in Full-Screen and in HD.
Click here for the full RCGroups.com blog write-up with photos on the original Eflite UMX Radian 2SBL with Dual Servo Ailerons conversion process, along with video of the Maiden Flight: https://www.rcgroups.com/forums/show...0#post34840924 I've upgraded my original setup of the Eflite UMX Radian 2S Brushless conversion with Dual Servo Ailerons that used the Eflite BL180 2300Kv Motor and Eflite 5 x 2.75 Prop to the Parkzone Ultra Micro F-27Q Stryker Powerplant which uses the Eflite BL180 3000Kv Motor and Stryker 3.75 x 3 Prop. The Eflite UMX Carbon Cub SS Rubber Spinner was also replaced with the much lighter Eflite UMX Sbach 342 3D Foam Spinner. The Hyperion 2S 330mAh Babbelbatt Lipo was used for the performance upgrade. First, let me apologize for the much longer flight video. I typically don't like to post lengthy videos, but in order to capture the performance capabilities of this highly upgraded UMX Radian, I felt that it was necessary. With this Stryker Powerplant upgrade, the reduced nose weight from the lighter Parkzone Ultra Micro F-27Q Stryker Prop and the much lighter Eflite UMX Sbach 342 3D Foam Spinner (reduced nose weight by 2 grams), along with the increased aft weight of the heavier Hyperion 2S 330mAh Babbelbatt (17 grams) as compared to the lighter Eflite 2S 200mAh (12 grams), placed the CG 2mm further back to 26mm from the leading edge of the main wing (CG was 24mm with the base 2SBL setup). This has enhanced its balance for excellent glide performance. To be brief, this Stryker Powerplant upgrade is outstanding and has awakened the capabilities of this already excellent 2S Brushless with Ailerons Conversion UMX Radian, transforming it into a powerhouse speedster that is not only fully capable of thermal hunting, but has balanced glide capabilities and the ability to climb vertical up and away into the atmosphere. MODIFICATIONS / UPGRADES Motor: Eflite BL180 3000Kv Brushless Outrunner EFLUM180BLB Propeller: Parkzone UM F-27Q Stryker 3.75 x 3 Propeller EFLUP037503 Receiver: Spektrum 6-Channel AS3X Receiver BL-ESC EFLU4864 Mount: Eflite UMX Yak Motor Mount EFLU5030 Spinner: Eflite UMX Sbach 342 3D Spinner EFLU4951 Main Wing Reinforcement: .070 Carbon Fiber Rod Spar (14") Custom Aileron System: (17mm x 130mm per Aileron) Aileron Servos: Spektrum 2.3 Gram Linear Long Throw Offset (2) SPMSA2030LO Aileron Control Horns: UMX Beast 3D Control Horns Aileron Control Rods: UMX Beast 3D Control Rods Horizontal Stabilizer Reinforcement: .050 Carbon Fiber Rod Spar Transmitter: Spektrum DX6 Mix: Aileron - Rudder Mix 85% Battery: Hyperion 2S 330mAh Babbelbatt Lipo AUW: 70 Grams Updated CG: 26mm from the leading edge of the Main Wing Throttle Timer: 5 Minutes Total Flight Time: 14 Minutes 35 Seconds Lipo Post Flight Final Voltage: 7.58 Volts / 8.40 Volts (31%) Camera: iPhone 6 at 1080P / 60 FPS Headmount: http://www.amazon.com/Mount-Smartpho..._detailpages00 Thanks for watching and if you haven't already please click the Thumbs Up and Subscribe! |
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Last edited by Blaze0021; Jun 05, 2016 at 08:37 AM.
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Tutorial part 1: mods for split-wings and carbon strenghtening
Hello,
I thought I would share my mods of the UMX Radian. To facilitate travels and mounting, I split the wing in 2 and used carbons fibre rods and pipes as well as micro-magnets to assemble the whole plane. I just finished part 1 of a tutorial video regarding the modifying the wings. Next video will be on the fuselage modification. The whole mod adds 4-5 grams to the whole plane. I could even save 2 grams more by not applying tape. Some of these mods were greatly inspired by other Youtube channels like fishycomics, Dennis Barker and mrkentdotcom. Big thanks to you! Hope someone finds it useful!
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Last edited by RCscale101; Oct 09, 2020 at 04:01 AM.
Reason: Harmonisation of title posts
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Tutorial part 2: carbon tail reinforcement and magnet mod for wings
Here is part 2:
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Last edited by RCscale101; Oct 09, 2020 at 04:01 AM.
Reason: Harmonisation of title posts
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Tutorial part 3: assembly, box modification and flight
Hello folks,
Here is the final part of this mod tutorial on UMX Radian. It's a better glider now and more responsive. Hope it may inspire someone too! Would love to hear.
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Picked up the brick, motor and prop from a foam challenged and totally spent UMX Radian for free from a friend. Purchased all the replacement new foam parts and dialed in the graphics in my usual European style. New foam is always fun, no factory graphics to remove! This is totally custom graphics mods, with a Swiss flair. Hope to take it out near the cliffs where the first Hobie Hawk was launched in Dana Point, CA.
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Dear fellow RC enthusiasts - I apologies if this is the wrong place to post as my inaugral
RC is fun - it helps me and my father bond (and we need it) -- ISSUE-- I have a EFlight UMX Radian AS3X using a Spektrum DXE TX We had our inaugral flight and we had a small crash (into light bush) The plane's motor is no longer responding. Elevator and rudder is fine. We do not believe the motor is damaged, the crash was very light as it was barely off the ground and no velocity We have tried to disable flight mode + rebind to no avail I am asking if someone can assist us with this? we did the steps in the manual to disable safe mode, but we are unable to get the motor to work batteries are charged Anyone can assist please? Would appreciate |
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Do you happen to have throttle cut on?
Read manual for that. |
Latest blog entry: Battery holder for the Parkzone 1100mm...
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Last edited by Christian_C; Jan 26, 2024 at 12:36 PM.
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