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HomeAircraftHelicopterHelicopter Main Discussion › Has anyone tried coaxial heli CX5 ?
03-20-2015 11:02 AM  3 years agoPost 1
spaceman spiff

rrKey Veteran

Tucson

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I am in the mood for a new toy. Maybe something a little off the beaten track.

http://www.tech-sov.com/products_detail_165.htm

what do you think?

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03-20-2015 09:19 PM  3 years agoPost 2
Phoenix NOTAR

rrApprentice

Tallahassee, Florida USA

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I have one. I have assembled it, and I have hovered it in my yard, but weather here (in PA) has prevented any flying around at a real flying field yet. I have flown the predecessor to this kit (the "Helibaby" Bullet EP-500) for many years. So far this one flies well, and of course is interesting and a bit different.

There is a video of Peter Wales flying his in the OHB video section. There is also a build thread in the scale section here on RR on maybe on Scale RCHelis.

Sandy

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03-21-2015 12:22 PM  3 years agoPost 3
Peter Wales

rrElite Veteran

Orlando Fl

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I have flown them and they are very nice, smooth and easy to fly. There is a build up in the scale section in docs under "a coax that flies"

The video of me flying at OHB is on here

There is another video on the US distributor website

Eastcoastvario.com

Peter Wales
http://scalehelicopters.org

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03-21-2015 01:03 PM  3 years agoPost 4
dgoss999

rrApprentice

UK - Lancashire

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Hi Peter,

I watched the Orlando video a couple of times and it seems the machine doesn't want to do a L/H (Counterclockwise) circuit. Was there a reason for that?? (any possible torque issues?)

Also a couple of time it pitched up quite badly when you applied some back cyclic and nodded profoundly just before you landed.

It looked quite a handful and from the grim frown on your face when you completed the flight you kinda thought so too!!

/DG

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03-21-2015 02:19 PM  3 years agoPost 5
Peter Wales

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Orlando Fl

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The grim face was because it started raining! I was determined to get a few minutes vidoe done and I was cold and wet at the end

The reason counterclockwise circuits were not done was that a 3D pilot was in the next box and the boxes were small. Going to my left would put me at risk of going into his airspace so rather than risk it I went where I was safe. With two counter rotating disks, there is no torque issue!

The nodding was down to the V-bar setup which needed more tuning. I asked one of their experts to come have a look at it and offer his advice and he promised to come by shortly. I sat around all day waiting and he never turned up. After a lot of trial and error I managed to sort it at home. I actually found the Tarot ZYX gyro worked better and cost less than the V-bar upgrade I needed to get into rate mode.

I like them so much I got another one and am I the process of sorting a scale fuselage for it.

Peter Wales
http://scalehelicopters.org

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03-21-2015 03:36 PM  3 years agoPost 6
dgoss999

rrApprentice

UK - Lancashire

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Hi Peter,

Then I'll look forward to the counter-clockwise circuits in your next video..

/DG

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03-21-2015 04:40 PM  3 years agoPost 7
Phoenix NOTAR

rrApprentice

Tallahassee, Florida USA

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From the 1/2 dozen hovering/small circuit flights I have done with this model (due to bad/cold weather), I can detect NO difference in left vs right turning or pirouettes.

In the 100's of flights that I have on the earlier model (flybared) I can assure you that there is no difference in feel or capabilities between left or right circuits with these coaxial helis.

If you are really good, you may detect a slight altitude change yawing right vs left, but like I said you need to be very sensitive to feel or see this.

Sandy

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03-21-2015 05:06 PM  3 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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How could two identical rotors spinning in opposite directions have any torque effect on the heli in a circuit?

I'm asking....

I literally never use the word literally right.

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03-21-2015 08:07 PM  3 years agoPost 9
Aaron29

rrProfessor

USA

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Not sure what you're asking.

If it's about how it turns, it increases speed (fixed pitch) on one set of blades while retarding speed on the other. The overall lift remains the same and the torque turns the heli.

If you're asking why it would turn better one way than the other, it doesn't.

Or were you going at something else?

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03-21-2015 08:11 PM  3 years agoPost 10
Aaron29

rrProfessor

USA

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If you are really good, you may detect a slight altitude change yawing right vs left, but like I said you need to be very sensitive to feel or see this.
This likely has to do more with the two motors having different speed changes than anything I can think of. I wouldn't be surprised to find a coax that does just the opposite.

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03-21-2015 08:31 PM  3 years agoPost 11
Einzelganger

rrKey Veteran

Campbell, Texas

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This likely has to do more with the two motors having different speed changes than anything I can think of. I wouldn't be surprised to find a coax that does just the opposite.
I don't think this is the reason.
Feature number three in the Product Details tab reads:

3. Single motor drive two shafts.

The difference is somehow mechanical, or maybe just imagined.
Looks like fun.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 08:37 PM  3 years agoPost 12
Aaron29

rrProfessor

USA

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Hmm how can it then turn?

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03-21-2015 08:44 PM  3 years agoPost 13
Einzelganger

rrKey Veteran

Campbell, Texas

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Hmm how can it then turn?
That is a darned good question.
Braking?
That would cost a lot of energy.
I guess something rather fancy in the drive train that I can not picture mentally.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 08:48 PM  3 years agoPost 14
Einzelganger

rrKey Veteran

Campbell, Texas

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Increase/decrease pitch?
Would that be enough?

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 08:51 PM  3 years agoPost 15
Peter Wales

rrElite Veteran

Orlando Fl

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It turns by altering the pitch of the top rotor and through a mix, altering the pitch of the bottom rotor in the opposite direction so the overall lift remains the same but the torque exerted by both rotors changes, one up and one down, to remain the same total.

Look at the build up to see the part which does it.

Peter Wales
http://scalehelicopters.org

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03-21-2015 09:00 PM  3 years agoPost 16
McKrackin

rrProfessor

Lucasville,Ohio

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But both rotors always turn the same speed.Right?
So no torque effect?

I literally never use the word literally right.

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03-21-2015 09:45 PM  3 years agoPost 17
Phoenix NOTAR

rrApprentice

Tallahassee, Florida USA

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Both rotors always rotate at the same speed (unless something is very Broken!).

As Peter noted, the yaw is a delta in collective pitch between the upper rotor system and the lower rotor system. The simple answer is that the helicopter yaws in the the same direction as the rotors with the least pitch (Relatively speaking).

Torque changes with the amount of collective pitch for any given rpm. I run a governed rpm, so the rotor speed is very constant.

Sandy

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03-21-2015 10:30 PM  3 years agoPost 18
dgoss999

rrApprentice

UK - Lancashire

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It's the torque change that generates the yaw!!

My response to Peter was questioning some control anomaly for the two rotors through the SAS system, but he confirmed there were no such issues!

/DG

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03-21-2015 10:39 PM  3 years agoPost 19
Einzelganger

rrKey Veteran

Campbell, Texas

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Torque change yes.
Torque effect on flight no.

Love to see this in an 800. Imagine the sound!
.....and the payload capabilities.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 11:26 PM  3 years agoPost 20
Peter Wales

rrElite Veteran

Orlando Fl

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I had a guy do some work o my house this afternoon so I stuck a camera in hs hand. He got the hang of it eventually, but here's the flight unedited

Watch at YouTube

Peter Wales
http://scalehelicopters.org

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