Hamilton Edge 540 - RC Groups
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Sep 09, 2017, 08:37 AM
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Hamilton Edge 540

This is my 26% Pilot RC Hamilton Edge 540. It has a 78 in wingspan without the winglets and is the largest that I could easily get in the back of my Tahoe. It has a 35CC DLE with rear mount exhaust. I used a B & B Specialites muffler with smoke ports rather than the supplied one because I heard bad things about the one that comes with the engine and it would not have fit without cutting away part of the engine box. I am currently running a Xoar 19/8 Beachwood Propeller. It has MKS DS1220 Digital High-Torque Servos. To get the CG to spec I used a rear mounted rudder servo and mounted the batteries at the forward rudder servo position. It uses two 2200mAh LiFe Receiver Batteries connected to a Smart-Fly SuperReg, a Tech Aero ignition battery eliminator IBEC, a PowerBox Smokepump. I have 3 voltages (2 batteries and the reciever voltage) and engine temperature telemetry on a Futaba receiver. I included a CORTEX 3-Axis Aircraft Gyro mostly because Frank has them in his airplanes and I wanted to try it out.

I mounted the the 14oz fuel and smoke tanks above and below each other. Cooling the engine under the cowl was a challenge. It would have been much easier with a opposed twin. First flight was a success with 12 clicks of down elevator and two clicks of right aileron required to trim. I think I am going to like this airplane.
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Sep 09, 2017, 08:42 AM
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Video of maiden flight

Maiden of the Hamilton (6 min 12 sec)
Sep 13, 2017, 09:37 AM
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mondofresh's Avatar
What a beauty!
Sep 23, 2017, 09:18 AM
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Beemans2's Avatar
My first flights indicated that it was tail heavy (it climbed hands off inverted). I have a version of an EDGE 540 on FlightSim that matches the size of my real one and adjusted the CG to have the same characteristics I found on my first flight. Then I moved the simulator CG until I got the desired characteristics (hands off level flight inverted or upright). This was about 0.6 inches forward or more nose-heavy. From the weight of the plane and the weight of the batteries I calculated I needed to move the batteries 13 inches forward. I moved the batteries in front of the fuel tank (and moved the smoke pump).
I flew the reconfigured plane yesterday and the balance was perfect. The new placement is shown.
Sep 23, 2017, 03:46 PM
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Here are my build notes.
May 20, 2018, 12:57 PM
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Hamilton Edge 540 Update

I changed a few items on the Hamilton this year. First, I must of had a hard landing or two because the wheel rims were broken. The originals were hard tires with almost no give so I replaced them with durbo soft, a wider and much softer tire. Second I changed the smoke tank to three line because with a two line I needed to clamp the feed to the muffler to avoid pumping the smoke oil there when filling the tank. Clamping the smoke oil line meant opening the canopy and I went to great pains to make sure I did not have to unbold the canopy between flights (small power off switch on the side). Hopefully, I will not have to do this any more. Third, I made an extended control bar for the tail wheel. It is about twice as long and should give me more ground control in those crosswinds.

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