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Old Dec 02, 2012, 11:52 AM
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microflitedude's Avatar
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Originally Posted by jgumley View Post
I've started a hobbyking idol build for a throttled/muffled cox 049. I will make it 4 channel by adding ailerons - ill post some pics
Very interested in seeing this.
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Old Dec 02, 2012, 01:35 PM
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surfer_kris's Avatar
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You don't need any ailerons when it is designed for rudder steering.
You could of coarse remove the wing dihedral and then you would need ailerons.
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Old Dec 02, 2012, 07:59 PM
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Originally Posted by surfer_kris View Post
I've put in shear webs in the center, but left the outermost bay without it. Ready to fly it weights 292g (about 10.3 oz) and has unlimited vertical. I have made the tail surfaces a little smaller than the stock design and the wing incidence can be reduced to about 1. It then flies very well, long drawn-out turns and big loops at full throttle are a blast. The engine makes about 20500rpm on a 5x4 and flies quite well at about half throttle too.

For building picts, I have made a little build thread here; Yellow Jacket
Nice build article. If you could still buy a kit I would get one or better yet build from plans if I could find a set.
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Last edited by robert harik; Dec 02, 2012 at 08:10 PM.
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Old Feb 03, 2013, 10:45 PM
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Here are the first shots from the build. I'm not a build novice but have never attempted this before so I'm sure there are a number of mistakes. I trust people will point those out to me!
Basically followed the plans but bulked up the front, added cheeks to give it a bit of strength and offset the motor by angling the firewall.
The area under where the wings attached seemed a little weak to me so I added spruce rails which also served as the mount for the throttle servo, receiver pack and receiver.
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Old Feb 03, 2013, 10:55 PM
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Now for the tank and engine mount. The tank is a 1oz standard from Cox International and the engine is a Cox 049 Surestart with throttle conversion. The fuel line runs through the firewall and up under the engine. Fuel filling will be via an extended filler access via the removable hatch.
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Old Feb 03, 2013, 11:10 PM
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Mounting of rudder and ele servos - nothing remarkable here.
Likewise - receiver, receiver batt and throttle linkage.
Note on parts:
- Rudder and ele servos are Hextroink HXT900 9g / 1.6kg / .12sec Micro Servo
- Throttle servo is a Turnigy Mini Servo 16g/2.1kg/.11sec
- Receiver is a Hobby King 2.4Ghz Receiver 6Ch V2
- Receiver pack is Cox Micro Receiver Battery Pack
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Old Feb 03, 2013, 11:13 PM
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Photos for the 11:10pm post...
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Old Feb 03, 2013, 11:16 PM
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Landing gear. Nothing radical. Gave it plenty of track and went with a tail-dragger as I feel that this will prolong its life when I fly it...
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Old Feb 03, 2013, 11:39 PM
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Wings...
This was always going to be a 4 channel so ailerons needed to be considered from the outset. Dihedral was reduced to somewhere between 5 and 10 degrees and ailerons were sized to fit between the ribs - no more science than this. I used torque rods for the ailerons as I had a pair from a salvaged Decathlon foamy that were the right size. See pics for detail...
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Old Feb 03, 2013, 11:43 PM
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Next will be the completed wing, prep for filming and hopefully a maiden.
Stay tuned...
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Old Feb 04, 2013, 12:23 AM
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Cox engines don't draw fuel very well, your tank needs to be level with the engine!
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Old Feb 04, 2013, 12:45 AM
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Yes; shouldnt the tank outlet be at the same level as the centreline of the crankcase as this is really the fuel intake?

Mark.
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Old Feb 04, 2013, 02:15 AM
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Excellent - I knew you guys would identify what I know will be a number of newbie errors!

Many thanks
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Old Feb 04, 2013, 05:10 AM
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Quote:
Originally Posted by robert harik View Post
Nice build article. If you could still buy a kit I would get one or better yet build from plans if I could find a set.
Yes, you don't really need the kit, you can easily build it directly from the drawing; Airagestore

I would recommend to reduce the wing incidence to close to zero, and add som 2-3 of engine downthrust. I also reinforced the wing attachment a little compare to the drawing (both in the wing and fuselage).
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