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Old Dec 26, 2010, 07:59 PM
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RC Cox .049 Ultralight-Electric Conversion


My dream of getting my old Cox .049 Powered Sky Rally Ultralight back in the air with an improved powerplant was finally accomplished today. This model hung in my gararge for many years and just needed the right powerplant. My modification utilizes a Micro Jet V3 motor, APC 7x5 E prop and 30 amp ESC from Grayson Hobby. The battery is an 11.1v 25C 1300mAh pack. The entire mod took only 90 minutes. The maiden flight was this morning and everything went perfect! Of the two flights today, the second flight was the longest at 11 minutes with throttle management. This ultralight cruises beautifully just around 45% throttle. Landing approaches are at 15% power and smooth touchdowns in a light breeze are a piece of cake.

I first flew this aircraft back in 1986 and it was extremely underpowered. Each flight was a real struggle to keep this bird in the air while you were at the mercy of the Cox .049. If the motor was too rich, then hang on because you were on the deck, fighting to stay in the air. Now...with the Electric Micro Jet set up, this Sky Rally Ultralight from Cox is a real joy to fly.

Best,
Tony
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Last edited by xplaneguy; Dec 28, 2010 at 04:19 PM.
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Old Dec 27, 2010, 12:38 AM
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I love it! good job!
Old Dec 28, 2010, 02:54 PM
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AJ750 - Thanks! I have 6 flights on it now and it ranks as one of my Top 5 all time favorites.

Best,
Tony
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Latest blog entry: Hobby King Le Petit
Old Dec 31, 2010, 05:27 PM
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Here's two photos of the original Cox Sky Rally Box and it's contents.

Best,
Tony
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Latest blog entry: Hobby King Le Petit
Old Dec 31, 2010, 09:57 PM
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Nothing beats Brushless/Lipo Power!


I too started my hobby flying 1/2 A Cox Reed Engines. While I loved flying, constant tinkering with the those little finicky power plants tested your patience. A few years back I converted my old Cox EZ Bee to brushless power. Power is incredible yet still soars like an eagle. Love it!!!!
Wished Cox still made the Sky Rally, nice looking Ultralight.
https://www.rcgroups.com/forums/show...ghlight=ez+bee

Cox EZ BEE RC Plane (1 min 4 sec)
Old Jan 03, 2011, 04:39 PM
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George-Nice work on the conversion! I've never owned an EZ Bee but it looks like a nice flying plane.

All the best,
Tony
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Latest blog entry: Hobby King Le Petit
Old Jan 05, 2011, 07:29 PM
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That's awesome! I'd love to pick up one of these if I ever see one for sale!

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