Here are some of my modification to the ModelAero Polaris Ultra. First let me say that Scott has produced a wonderful model and in stock form it flies great. However, I'm not happy unless my planes have spectacular vertical performance. Thus began my search for more power for my Polaris Ultra.
Mod 1 - My first mod was to mount the elevator servo through the bottom of the motor nacelle instead of using the stock ply mounting plate. I treated the servo electronics with CorrosionX and sealed the servo output shaft with Vaseline.
Mod 2 - My second mod was to install a larger motor to increase the performance of the Ultra on a 3-cell battery pack, and improve the balance. I have a bunch of 3-cell 2200 lipo packs and I wanted to be able to use them on my Ultra. With the stock weight motor, I had to shove the battery way back behind the battery compartment to get the Ultra to balance on the step. My Ultra was nose heavy with the stock motor weight. I finally settled on the Turnigy 35-36A 1400 kV motor.
https://www.hobbyking.com/hobbyking/s...00Kv_550W.html
This motor was a tight fit in the nacelle and the motor cowl needed to be trimmed a lot to get the motor to fit. With a Master Airscrew 8x6 3-blade prop, the Ultra came alive.
Mod 3 - However, this increased performance had its downside. The 20 gauge motor extension wires that Scott had originally supplied with the early kits were getting hot enough to melt the fuselage foam. Luckily Scott began supplying 16 gauge
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