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HomeAircraftHelicopterAerial Photography and Video › Helitronix Mixer any good?
11-11-2005 09:13 PM  12 years agoPost 1
Helicek

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istanbul - turkey

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Hi all,
any idea if this mixer and gyros on 2 cyclic axis set up would work for our flybar rotor systems? Can we gain anything? Addional stabilization for AP?
Let us know if you have any experince!
Cheers,
Ahmet

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11-13-2005 03:43 AM  12 years agoPost 2
Joel Rosenzweig

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Marlborough, MA - USA

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In my first phase of flight testing, I used a 2-bladed flybarred head to test out the mixer. The use of two gyros on a flybarred head does add some degree of extra stability, however, you can do even better by adding additional flybar weights instead (in this particular case).

If your camera ship had a multi-bladed head, then I'd agree that you'd benefit from adding gyros to it.

Regards,
Joel-

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11-13-2005 04:32 PM  12 years agoPost 3
Helicek

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istanbul - turkey

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Hi Joel,
Thanks for your input. I dont have extra weights on the flybar. Just lead sticks in the paddles (the ones that came with the kit). My AP helicopter is a Vario Petrol Mechanics, front mounted camera and the rest is standard setup. Fully loaded flying weight is nr 20lbs. On calm and mild windy days nr 300ft hovers are managable. But when you have to fight the tail into gusts things get out of hand very quickly. Every APer would like to benefit from some sort of stability aid in similar situations. Helitronics system sounded well. I wondered if any AP pilot used this system in their AP helicopter?
Cheers,
Ahmet

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11-13-2005 10:04 PM  12 years agoPost 4
UK_Sonics

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Oxford, U.K

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Hi Helicek

I have recently been reading about the AP2000i on spartanrc.com after seeing Angelos test flying it one weekend, it will do CCPM mixing with or without an additional stabilasation sensor.
Also mentions inertial sensors, not due out for a while :-(

John

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11-14-2005 01:06 AM  12 years agoPost 5
Joel Rosenzweig

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Marlborough, MA - USA

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I took a look at the AP200I product page:

http://www.spartanrc.com/products/ap2000i/ap2000i.htm

As mentioned, it does not by itself do any additional stabilization. You need to plug in the stabilization modules (gyros or IR sensing units).

I've had folks plug the Pilot Assist (PA-1, and PA-2) into the Helitronix Mixer and that works fine. The point is, it's not integrated into the mixer itself, so you'd need to add that. The Pilot Assist is not a gyro. It's an active flight stabilizer. If you're comfortable with that technology, and you fly in conditions that support it appropriately, it's a fine way to go.

I think there is now a version of the Pilot Assist that generates CCPM natively, so you wouldn't need either mixer in that case.

Also, depending on your budget, there are inertial guidance systems (real auto pilots) available that work very well. They will hold the postion of the helicopter for you under all sorts of circumstances. I have not seen a system for less than several thousand dollars. But if you are doing this work professionally, it might be just the way to go.

Regards,
Joel-

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11-14-2005 02:04 AM  12 years agoPost 6
Angelos

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nr Oxford, OX11, UK

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It looks like the AP-2000i description is a bit confusing so I will try to clarify...

The firmware in the AP-2000i runs the CCPM calculations, digital cyclic ring and 2 PID loops for cyclic stabilisation with room for a 3rd one if I decide to stabilise altitude in the feature. The expansion connector allows sensors to be connected directly to the AP-2000i. The connector has both analogue and digital function, thus I can connect an infrared horizon sensor at the moment until the more advanced inertial sensor is ready which will stream roll/pitch data digitally into the AP-2000i. The same connector also offers USB connectivity via an adaptor cable to upgreade the firmware.

The stabilisation function can be disabled when no sensor is connected, the PID loops are not executed and the system acts simply as a CCPM mixer. In this case you can have gyros or Pilot Assist or any other system connected on the aileron/elevator input channels.

And to go back to the original post... I too agree that heavier paddles or flightbar weights will perform better than gyros. However, what is that you want to achieve. Smoothen out pilots controls, wind gusts or have the helicopter level itself?

-Angelos

Spartan RC R&D

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