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Nine Eagles Yak 54 (Refitted)

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The Nine Eagles Yak54 777B gets a serious upgrade. We started by purchasing the complete frame as spare parts and totally refitted the internals of the plane to see if we could improve the performance. We were not dissapointed with the results of this project.

Specs
Receiver: DTrx36 bare     Flying Weight : 32grams
micro 3amp ESC ESC: XP-3A ESC     Airframe Weight : 16g
AP02 brushless motor Motor: AP-03 Brushless     Wingspan: 40cm
GWS 2510 Propeller Propeller: GWS 5030     Length: 36cm
90mah lipo Battery: Nano-Tech 130Mah with JST Plug      
Servos: Micro Linear      
       

 

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First on the agenda was that 8mm brushed motor - That just had to go, and we decided to replace it with a brushless AP-03 motor. This motor gives about 20% more thrust than the original powerplant and with a little weight saving as well. All up we achieved a 20% increase in thrust and also about a 20% decrease in weight adding up to considerable performance increase.

Here we are making a template for the new motor mount which will be made out of Ply wood. This involves cutting into the foam to make a slot to secure the new motor mount.


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Using the cardboard template to cut the motor mount from 0.8mm thick ply wood. Ply wood makes a very good surface to screw into as you can use miniature screws and 0.8mm ply gives ample thickness to hold the screw firmly. Don't over tighten them!

 

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The final installation of the motor. Notice also the 6mm Depron foam behind the motor mount added to give extra strengthening.

Related Products
UHU por Glue AP-03 Motor
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The Xp-3A ESC mounted on a foam mount made of Depron. The Depron foam has gaps cut into it to allow the FETs on the board and other IC components to fit neatly. Mounting near the motor also allows the 2mm Nano connector to be soldered directly to the wires from the motor without needing any extensions. As well as this, we needed to add weight to the nose to compensate for the AP-03 motor's weight which is less than the original.

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UHU por Glue XP-3A ESC Unit


UHU por Glue 2mm Micro Connector

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This image shows the seating block for the servos. The two U shapes sections are where the micro linear servos will sit and the space below is for the ICs and other components which protrude beneath the servo. The servos are also sloped down at the back to allow the pushrods to run straight.
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With all the servos mounted and soldered directly to the DTRx36 receiver unit. The wires are pushed down into the cavity below and come back up again under the receiver to solder to the bottom side.

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A good close look at the DTRx36 receiver unit mounted on a piece of Depron foam. The foam as been cut to fit on the curve of the wing and the receiver is attached to the foam with double sided servo mounting tape. Only the clear space on the back of the servo is used for mounting and this leaves connectors free to receive wires.

Related Products
UHU por Glue DTRx36 Receiver


UHU por Glue Servo mounting tape

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The servo mount for the ailerons.
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Additional cutouts made to run the pushrods because the servos used sat higher than the original ones. The pushrods used are 0.8mm carbon rod.

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UHU por Glue 0.8mm carbon Rod

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Done - all ready to fly
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Pictured here with a different prop but the best prop to use is the GWS 5030.

 

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UHU por Glue GWS 5030 Prop

A quick flight at the local park with take off from ground and landing.

Reflection: What a great project this was. We wanted to improve the performance of this reliable airframe and performance was what we got. The reduced weight and additional power from the brushless setup really add up to a lot of fun. Flat out this plane really gets up some speed and I would even say that it's too much speed for the airframe producing unpredictable performance at times. Where you really notice the additional power is in climbing and of course the climb rate is very good although still not vertical. Landings are greatly improved as well with the 20% weight reduction making this plane a real little floater. You can literally drop it onto the ground within a couple of meters. All up a real improvement made here. I had previously owned a NE 777B RTF which I thought was bit difficult to fly so I'm glad that I was able to refit this airframe and do it some justice.