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11-12-2005 05:33 PM  12 years agoPost 21
rha

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North Yorkshire, United Kingdom

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Nope..!! I have never seen the Hirobo model apart from the usual photos. I wanted something a bit larger and scale like, Vario make the fuse but no mechs so with this and a basic outline drawing from Boeing I designed and built the mechs from the ground upwards.

I started with just one gyro on the yaw, then after the first couple of test flights decided to fit one to the elevator and this is where I ran into problems with the mixer. There is no mechanical mixing used, both front and aft rotors have their own set of 3 point CCPM servos, all the mixing is done electronically by the TH-2GP controller.

Vario also have a 3 aixs gyro for multi-blade heads, I'm using straight forward Futaba GY240's as I don't need HH.

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11-13-2005 03:57 AM  12 years agoPost 22
Joel Rosenzweig

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Marlborough, MA - USA

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Can you describe the problem that you ran into with the TH-2 mixer with more detail? Every indication from the specs would lead me to believe that you can add an elevator and/or aileron gyro to the TH-2 and that it would properly control both rotor heads.

If you could clarify the problem a little that would be helpful. I don't own a TH-2 mixer. However, I did design and manufacture the Helitronix Tandem Rotor mixer as a follow on to my original Helitronix Mixer, so I have some experience that I might be able to share with you.

I too, am building a Vario Chinook, and will need to fabricate some set of mechanics. I also needed the mixing electronics, so I made my own. I haven't offered the Tandem Rotor Mixer for sale yet. I have to complete my Chinook first so that I can complete some flight testing.

Joel-

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11-13-2005 10:19 AM  12 years agoPost 23
rha

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North Yorkshire, United Kingdom

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Joel

The problem wasn't with the TH-2 mixer itself, it was how I was trying to use it. As I said in my first post to jgoodsell "There have been some issues around my use of the TH-2 tandem rotor controller"

Used correctly the TH-2 is a great tandem mixer that is fully programable and gyros can be used on all 3 axis if need be without any problem.

I look forward to seeing some photos of your Vario Chinook as the build progresses.

Richard

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11-13-2005 12:51 PM  12 years agoPost 24
Joel Rosenzweig

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Marlborough, MA - USA

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and this is where I ran into problems with the mixer.
The problem wasn't with the TH-2 mixer itself, it was how I was trying to use it.
That's why I'm asking your for a clarification. I'm simply trying to understand what type of problem you ran into. You said above that you ran into problems with the mixer. You didn't describe the actual problem, and you didn't state any details about it. Hence the question. :-)

So, what issue did you run into and how did you go about resolving it?
I look forward to seeing some photos of your Vario Chinook as the build progresses.
I can hardly wait to start making progress with my Chinook. I will certainly post some photos when I get going.

Joel-

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09-17-2008 07:25 PM  9 years agoPost 25
Jpiehnik

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York, SC

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Real CH 47 flight

Your question about real chinook flight has a very long answer. However, in short, there are several other smaller actuators(other than the ones driving the swashplate directly) in a real Chinook, DASH, LCT, CCDA, not to mention flight stability computers. All of these make small changes to the flight response of the helicoper at various airspeeds to stabalize the aircraft and make it react more predicatably in ground, hover, and in flight modes. This is totally not do-able in a model as the electronics and computer logic that would be required would be cost inhibiting and massively complex. My advice is to trim the aircraft to fly at a hover with near nuetral stick position, and understand that at a hover or on ground aft cyclic will need to be applied to hold a position. As forward flight increases and goes through effective trasitional lift, to maintain a constant airspeed you will have to apply aft cyclic more than you would think. There is a bit more to it than that, but that is the short version.
By the way there is a new real Chinook and it is awesome, CH-47F. Very impressed so far. Been working and flying on them for 24+ years. Been into RC longer and just found out about the RC 47. Where can I buy one?

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