Thread Tools
Old Sep 06, 2009, 09:45 AM
gwfalcon is offline
Find More Posts by gwfalcon
Registered User
Discussion

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.
Sign up now
to remove ads between posts
Old Sep 06, 2009, 10:20 AM
Balr14 is offline
Find More Posts by Balr14
Cranky old fart
Balr14's Avatar
You may find this to be a lot more practical than a conventional coax.
http://www.gressaero.com/microvader.html
Old Sep 06, 2009, 10:12 PM
Stumblebee is offline
Find More Posts by Stumblebee
Registered User
Stumblebee's Avatar
I totally agree with Balr on this one. These products are far ahead of the pack.
Old Sep 07, 2009, 10:26 AM
gwfalcon is offline
Find More Posts by gwfalcon
Registered User
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?
Old Sep 07, 2009, 10:47 AM
Balr14 is offline
Find More Posts by Balr14
Cranky old fart
Balr14's Avatar
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!
Last edited by Balr14; Sep 07, 2009 at 11:00 AM.
Old Sep 07, 2009, 11:23 AM
Stumblebee is offline
Find More Posts by Stumblebee
Registered User
Stumblebee's Avatar
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?
Old Sep 08, 2009, 01:16 AM
Fly-a-kite is offline
Find More Posts by Fly-a-kite
Registered User
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.
Old Sep 19, 2009, 09:15 AM
gwfalcon is offline
Find More Posts by gwfalcon
Registered User
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.
Old Sep 19, 2009, 11:16 AM
Stumblebee is offline
Find More Posts by Stumblebee
Registered User
Stumblebee's Avatar
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.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Coaxial heli picture nachman Micro Helis 42 Sep 28, 2006 06:37 AM
Bladerunner coaxial heli - anyone flown one? mwarner Micro Helis 1 Oct 11, 2004 08:21 PM
Micro coaxial heli so far nachman Micro Helis 14 Jun 12, 2003 01:00 PM
coaxial heli so far nachman Micro Helis 5 Feb 09, 2003 04:09 AM
micro coaxial heli nachman Micro Helis 4 Nov 11, 2002 02:54 PM