Acerbic Resonance

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GWS Tiger Moth 400 With Brushless Power

Well, Christmas has come and gone, and I scored a bunch of stuff to feed my RC Planes habit:

So, now I have all the guts that an RC Plane needs, but I had no airframe to stick it all in. So, a few days after Christmas I headed to my local hobby shop and picked up a GWS Tiger Moth 400 model kit:

Why did I pick this particular model?  Well, first of all, it was in my price range (aka cheap) and secondly it looked to be enough of a challenge to keep my interest, but also be a heck of a lot of fun to fly.  Also, this is my first 4 channel plane, so I wanted to choose something that would be a relatively slow flyer.

Building it took a lot longer than I was expecting, and the instructions have a few errors in them – there are 2 I will point out:  It has an incorrect measurement for cutting the guide tubing for the push/pull rods that run from the electronics compartment to the rear of the plane.  Secondly, the plane comes with a bunch of different sizes of some of the parts – in particular, the retaining bracket that holds in the landing gear wire is one I fouled up.  The instructions said to put in part C10, so I grabbed the first C10 I found and glued it in.  Many steps later, the instructions finally get around to putting the landing gear wire into the bracket you glued long ago.  Mine didn’t fit.  I dug through the parts I had left and found several other brackets, also marked C10, with different sizes to accommodate different landing gears.  Watch for this.

Other than some other minor issues with trying to follow the instructions, the build went well.   There are 2 modifications I made to this plane right from the start:  I did not install the stock wheels, instead choosing some ultra-light foamies that will work better in the field where I fly.  Secondly, I did not mess with the supplied motor and gearing for the prop – instead I installed my new brushless motor listed above.  This required a bit of creative mounting for the motor, but the results look great and hopefully will fly just as well.

Some pictures of the build process and finished plane:

I’ve checked the center of gravity, and I’ve done some glide tests with it to make sure I won’t have any nasty surprises in the air the first time I fly it.  With this brushless power system running off of my SuperCub’s 9.6v NiMh battery pack, this plane will hover perfectly vertical.  As soon as I can get some 12v LiPo batteries, I ought to have a nearly unlimited vertical climb. 🙂

I’ve also attached my new video camera to the top of the top wing, and have just been waiting for the weather to cooperate so I can take it out for a maiden flight.  The weather man promises that tomorrow looks like the day, so stay tuned for an update soon.


5 responses to “GWS Tiger Moth 400 With Brushless Power”

  1. Nice. Looks fun, keep me “posted.”

  2. Nice!!! Question on your motor mount – is that the mount for the Parkzone T-28? How’s it attached to the firewall (epoxy or screws)? And lastly, does that mount allow easy ability to adjust thrust angle.

    I’m just starting my TM400 build and want to use my T-28 motor mounts that I have – never really liked GWS stick mount.


    1. Yup, that is a motor mount from a T-28, and it is just epoxied to the firewall. As for thrust angle, I just use a series of washers between the motor mount and the back of the bracket attached to the motor…. more washers on the upper right, less washers on the lower left. I can adjust the angle by increasing or decreasing the number of washers. It’s not an ideal solution, but works reasonably well.

      I’d love to see the results of your build when you are done!

  3. Thanks for the info!!! Now if I can just decide on a motor/esc combo. I have an EFlite 25A esc from a T-28 that I plan on using; just need to figure out a motor.

    Keep you vids going! Nice blog btw!


  4. Thanks for the info!!! Now if I can just decide on a motor/esc combo. I have an EFlite 25A esc from a T-28 that I plan on using; just need to figure out a motor.
    I plan on adding some scale details, so currently doing a lot of reading on

    Keep you vids going! Nice blog btw!


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