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HelicopterTandem Rotor Craft Chinook - Osprey › DCP settings and many other stuff
12-23-2008 12:22 AM  8 years agoPost 1
Lockwire

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Emmerich - Germany

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Hi Guys

Slowly finishing up the mechanical part of my Vario Self build chinook and now ready to put in servos, electronics etc. I am blessed with the helitronix mixer. Joel. THX for that one, but now I am lacking a little bit on info about the first setup. Programming the helitronix is a piece of cake, but what about initial data ? Anyone have a clue about how much you should set your DCP for a first trial ? How much differntial blade angle for a roll movement ? Frankly I have been looking for the Hirobo manual to see if I can get some info from there but I cannot find anything on the internet. Does someone have a copy or pdf or so ? Or does anybody know from experience what to start with?

THX and regards

Lockwire

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12-24-2008 01:54 AM  8 years agoPost 2
Joel Rosenzweig

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Marlborough, MA -​USA

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I started with 3 degrees of DCP and made small adjustments from there.

The most important piece of advice I can give is that you perform small incremental adjustments following dynamic tests to balance out the forces acting upon the machine. If you have a test jig, this would make your life a lot easier. Otherwise, you'll need to make very short test hops and make adjustments as needed, and this will be a lot more tedious.

Specifically, you want to make sure that your front and rear pitch settings balance each other for a good lift off. This doesn't mean that they will have the same pitch as each other. In my case, they had to be different by about 2 degrees. I suggest starting with them equal, then making small adjustments as you do the test hops. As you adjust the front/rear pitch, you will probably end up inducing yaw in one direction or another. So, you have to stay on top of it and be prepared to make yaw corrections with the sticks. Take good notes and adjust the settings a bit at a time to get it balanced.

In some way, you need to adjust the yaw and the pitch at the same time so that the machine does not want to yaw, and it lifts off the way you like.

If you are using heading hold gyros, you might consider turning them to rate mode for initial setup so that they don't mask a setup error. The heading hold gyro mode can certainly compensate for an imbalance in the setup, which is something you need to be aware of if you are trying to achieve an optimal setup.

Also critical is your head speed. If the speed is too high, you'll get a lot more mechanical gain than if the speed is on the low side. My first take off attempt was a disaster because I miscalculated my gear ratio and ended up with a 1600 RPM head speed with my 2x1500mm discs. It was far too sensitive at this speed. I needed 1150 RPM for the right feel.

The setup process is quite cyclical. After adjusting one thing, you'll move to the next, and after that, you might have to revisit a parameter that you've already adjusted.

Best of luck.

Joel-

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12-25-2008 12:18 PM  8 years agoPost 3
Lockwire

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Emmerich - Germany

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Joel

THX for your quick reply, getting quite nervous now to do the first hover but I guess it will be OK and will work out (in the end). Did I see in another forum that you will stop producing the mixer ? That is bad news, if this project goes well I definately want to build another one but then with turbine and bigger.

Thank for for your service, you are an asset in the twin rotor world.

regards

Leon

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12-25-2008 09:12 PM  8 years agoPost 4
Joel Rosenzweig

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Marlborough, MA -​USA

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Hi Leon,

Take it slow and you'll be OK with the tandem.
Did I see in another forum that you will stop producing the mixer ?
Yes, I am going to shut down Helitronix at the end of December. I'm taking orders for mixers until then, but not afterwards.

Regards,
Joel-

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