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Old Sep 06, 2009, 08:45 AM
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Recommend a reliable big coaxial heli platform

Dear All:

One question (as topic) for big coaxial heli. I am involved in a project for upgrading a 450mm-rotorspan coaxial heli to a auto vehicle.

I searched the internet and found three, Big Lama, Walkira 53-1, and Exceed blazing star (sure there should be other models). However, I am new to this area and tons of infos. Generally what I need are:
1). 450mm rotorspan for more payloads;
2). brushless motor for more power;
3). reliable heading for indoor flight, and easy for control;
4). price is actually not a problem for the current project.

So could you experts here recommend me which is the best one according to your experience?

Any suggestions are greatly welcome.
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Old Sep 06, 2009, 09:20 AM
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Germantown, WI.
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You may find this to be a lot more practical than a conventional coax.
http://www.gressaero.com/microvader.html
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Old Sep 06, 2009, 09:12 PM
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I totally agree with Balr on this one. These products are far ahead of the pack.
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Old Sep 07, 2009, 09:26 AM
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Many thx, Barl and stumblebee.

I will consider the evador kit in my project.

My supervisor currently is still sticking on the coaxial one.

So any suggestions?
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Old Sep 07, 2009, 09:47 AM
Cranky old fart
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Germantown, WI.
Joined Oct 2007
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The problem with large coaxes is there isn't any good way to upgrade them to handle payloads. There are currently no brushless models being made and converting to brushless would require adding two brushless ESCs and converters to attach them to the existing 4 in 1 modules, if that's even a possibility.

The blade size and configuration is another issue. You are going to have to live with what you have. Nobody makes upgrades. Increasing payload isn't just a matter of increasing motor speed or power, if the blade configuration induces too much drag.

Unless you are working in a very large indoor area, the amount of air these large coaxes move is quite a lot; so they are highly affected by air current in a smaller space.

You may want to give a Walkera 38 or UFO #5 a try. The Walkera 38 will take some upgraded 370 motors and it's not likely to notice extra payload weight as much as a single rotor coax. You can upgrade a UFO #5 to full brushless with dragonflyer props for $250,which should sustain moderate payloads. I started a similar project with these two helis as a base some time ago, but I was more interested in outdoor performance and didn't get real far, when I ran out of money.

These two birds may not serve as final platforms for what you want to accomplish, but they would serve as cheap feasibility study platforms.

There's always the DragonFlyer... at $35k!
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Last edited by Balr14; Sep 07, 2009 at 10:00 AM.
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Old Sep 07, 2009, 10:23 AM
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Quote:
Originally Posted by gwfalcon
Many thx, Barl and stumblebee.

I will consider the evador kit in my project.

My supervisor currently is still sticking on the coaxial one.

So any suggestions?
What is it you wish to lift?
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Old Sep 08, 2009, 12:16 AM
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Australia
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There is a brushless version of the Esky Big Lama being offered by Rc711. It is the only brushless RTF coaxial kit that I have seen thus far.
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Old Sep 19, 2009, 08:15 AM
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Quote:
Originally Posted by Fly-a-kite
There is a brushless version of the Esky Big Lama being offered by Rc711. It is the only brushless RTF coaxial kit that I have seen thus far.
Great thanks for all of your guys' support.

I am planning to buy both the evador kit and the brushless lama version. Think both are needed for my current project.
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Old Sep 19, 2009, 10:16 AM
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Port Coquitlam, BC CANADA
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Quote:
Originally Posted by gwfalcon
Great thanks for all of your guys' support.

I am planning to buy both the evador kit and the brushless lama version. Think both are needed for my current project.
Please, keep us informed about how you progress with the Evader kit. This looks like such an interesting aircraft.
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