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Official Freewing Twin 70mm AL37 Airliner Thread

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  • Originally posted by ABJ View Post
    Maiden done, all vent well and my concern about the extra weight by flying with two 4000 MaH Bats proved not to be a problem, only catch was it required a rather long takeoff run, but landing was fine with plenty af elevator authority to flare.. However i found out that supply cable from bat's to ECS got extremely hot, which i think i strange when considering that i only had full throttle during take off, rest of my flight was at half gas, just cruising around .. Flight time with 2 x 4000Mah 70C was 4 mins, and the cells were at 3,75 after..

    Im suspecting the factory wire Y connection from ECS to Battery connector might be soldered bad, or just made of to thin wires..

    The heat and the power consumption seems strange,,

    Does anybody in here have the same heat build up in cables and connectors when flying.. ?
    I fly my 6S Freewing Hawk T1 & F-35 frequently and have never experienced warm cables / connectors


    :-) Anders


    You're flying off what looks like fairly deep grass. It's going to take a long distance to get off the ground. When I fly off grass, this plane can take twice the distance to lift off.
    I don't recall anything getting hot, maybe the battery comes down a little warm but that's it.

    Comment


    • Hi ABJ, I had an EC5 connector on an AL37 get hot enough to form a bubble on one side of the connector. The cause was a poor solder connection inside the male side on the contact screen that expands off the center shaft and makes contact with the inside of the female EC5.

      If you suspect it is the EC5 getting hot, get a very bright light and look inside the male EC5. Look for damage. Also, consider replacing the male EC5 with the split-shaft type of EC5. See photo below…

      Tip - After about 2-3 flight sessions, I wet a cotton swab with alcohol and clean out residue that forms inside the female connector of all my batteries. You will be amazed how dirty the cotton swab can get. Clean=less resistance=cooler connector

      A very warm EC5 = ok. Hot EC5 = there is a problem.


      Note: There are some good YouTube videos showing tricks to solder 10 AWG wire. Watch a few. You should be using 10 AWG wire.

      -GG

      Click image for larger version  Name:	53382D07-47CE-4E32-8DDF-35DCC78C0133.jpeg Views:	0 Size:	18.8 KB ID:	318459

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      • Click image for larger version  Name:	20210711_210841_1.jpg Views:	0 Size:	184.5 KB ID:	318568 Finished my 2nd AL37 in Voegol livery. I've always loved this scheme. I originally asked Callie back in 2019 and finally did it. Click image for larger version  Name:	20210711_212031_1.jpg Views:	0 Size:	280.9 KB ID:	318562Click image for larger version  Name:	20210711_190336_1.jpg Views:	0 Size:	128.3 KB ID:	318563Click image for larger version  Name:	20210711_185831.jpg Views:	0 Size:	200.6 KB ID:	318564Click image for larger version  Name:	20210711_195110.jpg Views:	0 Size:	153.8 KB ID:	318565Click image for larger version  Name:	20210711_185345.jpg Views:	0 Size:	254.7 KB ID:	318566

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        • Originally posted by Iflycessna182 View Post
          Click image for larger version Name:	20210711_210841_1.jpg Views:	0 Size:	184.5 KB ID:	318568 Finished my 2nd AL37 in Voegol livery. I've always loved this scheme. I originally asked Callie back in 2019 and finally did it. Click image for larger version Name:	20210711_212031_1.jpg Views:	0 Size:	280.9 KB ID:	318562Click image for larger version Name:	20210711_190336_1.jpg Views:	0 Size:	128.3 KB ID:	318563Click image for larger version Name:	20210711_185831.jpg Views:	0 Size:	200.6 KB ID:	318564Click image for larger version Name:	20210711_195110.jpg Views:	0 Size:	153.8 KB ID:	318565Click image for larger version Name:	20210711_185345.jpg Views:	0 Size:	254.7 KB ID:	318566
          Beautiful, I guess it's safe to assume you kinda like the AL37!
          Hugh "Wildman" Wiedman
          Hangar: FL/FW: Mig 29 "Cobra", A-10 Arctic, F18 Canadian & Tiger Meet, F16 Wild Weasel, F4 Phantom & Blue Angel, 1600 Corsair & Spitfire, Olive B-24, Stinger 90, Red Avanti. Extreme Flight-Slick 60, 60" Extra 300 V2, 62" MXS Heavy Metal, MXS Green, & Demonstrator. FMS-1700mm P-51, Red Bull Corsair. E-Flite-70mm twin SU-30, Beast Bi-Plane 60", P2 Bi-Plane, P-51, Apprentice.

          Comment


          • Originally posted by GliderGuy View Post
            Hi ABJ, I had an EC5 connector on an AL37 get hot enough to form a bubble on one side of the connector. The cause was a poor solder connection inside the male side on the contact screen that expands off the center shaft and makes contact with the inside of the female EC5.

            If you suspect it is the EC5 getting hot, get a very bright light and look inside the male EC5. Look for damage. Also, consider replacing the male EC5 with the split-shaft type of EC5. See photo below…

            Tip - After about 2-3 flight sessions, I wet a cotton swab with alcohol and clean out residue that forms inside the female connector of all my batteries. You will be amazed how dirty the cotton swab can get. Clean=less resistance=cooler connector

            A very warm EC5 = ok. Hot EC5 = there is a problem.


            Note: There are some good YouTube videos showing tricks to solder AWG wire. Watch a few. You should be using 10 AWG wire.

            -GG

            Click image for larger version Name:	53382D07-47CE-4E32-8DDF-35DCC78C0133.jpeg Views:	0 Size:	18.8 KB ID:	318459
            Thanks for your input.. im replacing the entire power wire harness, will use thicker wire and solder directly on to the esc's
            Hope that will fix the heat issues.

            Comment


            • Morning flight
               

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