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HomeAircraftHelicopterTandem Rotor Craft Chinook - Osprey › New Mechanic for Vario Chinnok Elektric/Turbine Airborne
02-18-2013 06:33 AM  5 years agoPost 1
Stefan Reusch

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Limburg, He- Germany

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Hi,
My English is very Bad, here are not so much Words ;-)

3D Cad Construction usw you can See on
http://www.rc-heli.de/board/showthread.php?t=217454

The Last Video from Yesterday is here

Watch at YouTube

I Think in 1 or 2 Weeks the Machanic going in the fuselage.

Stefan

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02-18-2013 05:32 PM  5 years agoPost 2
heliwreckr

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Battle Creek, Taxigan

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Looks very good

It's not crashed 'til it hits the ground

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02-19-2013 02:16 AM  5 years agoPost 3
chinooker

rrApprentice

Florence, KY

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Vario Chinook
Your tandem looks and flys great. What kind of mixer and stabilazation system are you using?

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02-19-2013 06:08 AM  5 years agoPost 4
Stefan Reusch

rrNovice

Limburg, He- Germany

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Hi,

Mixer ist the TH-2, i think its the best Mixer you can buy.
Stabi is the Helicommand HC-3SX, in Future it comes under
Bavarian Demon HC-3SX.

Stefan

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02-21-2013 02:24 AM  5 years agoPost 5
Joel Rosenzweig

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Marlborough, MA - USA

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Hi Stefan,

Your flight looks very good. I think there is a little pitch axis nodding, but I bet you can tune that out with the Helicommand.

I'm interested in a few details to help me setup my own.

Do you use differential collective pitch for the front and / or rear rotor heads? If so, on which head(s) and how much pitch does each rotor head change from full negative to full positive cyclic?

Do you use any elevator mixing for the front and / or rear rotor heads?

I have experimented with trying 0 to 5 degrees DCP on 1) both heads, 2) front only, 3) rear only, 4) elevator mixing in combination with and without DCP, and various other mix combinations. I have not quite settled on the best combination yet. The problem I run into, is that the pitch axis is less stable than it should be, and as a result, the rear rotor head has a tendency to drop quickly when coming out of forward flight. It rotates faster than I can compensate for with my sticks. Ideally, the stabilization would do a better job counteracting that. You seem to have reached a good balance. I'm interested in trying a setup that more closely resembles your configuration to see if I can tune the pitch axis behavior to be better.

Regards,
Joel

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02-22-2013 07:52 AM  5 years agoPost 6
Stefan Reusch

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Limburg, He- Germany

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Hello Joel,

i use at the moment only DCP fpr Pitch, no cyclic. But im try alternetive Settings when the weather ist better and no snow there.
In a other Tandem i use 50% DCP only and its also fine.
The secret is not the Mixing, i think its the Stabilisation.
Are u using Gyros or a FBL System?

Regards
Stefan

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02-22-2013 02:37 PM  5 years agoPost 7
Joel Rosenzweig

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Marlborough, MA - USA

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Stefan,

I am using an SK-360 for the FBL stabilization.

How many degrees of pitch change do you have on each head in your configuration from full back to full forward elevator? I'm trying to understand how much mechanical gain you have in the system.

I found that when using DCP only, that the heli would rotate easily, but it would not fly comfortably forwards and backwards. Only if I added some amount of elevator mixing would it start to maneuver properly.

Other than that tail drop issue I mentioned, mine is working OK, but the tail drop is still a big issue that stands in the way of the heli flying perfectly.

I need the snow to melt, too, before I can get more test flights in. I recently added some Vario 3-bladed single bolt heads to the machine to replace some more rigid all metal heads that I had previously. The Vario heads have positively changed the behavior of the machine in significant ways. The tail drop problem was reduced significantly, but it's still present. I am hopeful that I can tune it out with more test flights and adjustments to the SK-360. But if a different FBL would be better, I would try that too. I've had great results with the DJI FBL units, so that would also be a possibility.

Regards,
Joel

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02-23-2013 09:54 AM  5 years agoPost 8
Stefan Reusch

rrNovice

Limburg, He- Germany

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Hello Joel,

Please give me technical Datas from your machine.

Rotorspan, weight, RPM, and the Rotorblades.
What kind of enginge, e or v.

Regards
Stefan

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02-24-2013 03:35 AM  5 years agoPost 9
Joel Rosenzweig

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Marlborough, MA - USA

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Hi Stefen,

The tandem is using 700mm blades, at 1250 RPM. The blades weigh about 180g each, and are fully symmetrical profile. They are RJX blades.

The heli is electric powered. The machine is the same size as yours, as it is intended to fit into the Vario Chinook fuselage.

I don't know the all up weight right now. It's in the neighborhood of 16 pounds without batteries.

Regards,
Joel

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02-27-2013 12:06 PM  5 years agoPost 10
Stefan Reusch

rrNovice

Limburg, He- Germany

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Hello Joel,

The Tail drop is only no problem with extreme smooth Rotor Head/ Blades. I think your Blades are not smooth enough, my Rotor Heads are also Vario Single Bolt, but modified.
Please give a view weeks for testing my Chinook. I have some Ideas to make the Flight better, i told it here when its positive.

Regards
Stefan

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03-03-2013 06:04 AM  5 years agoPost 11
Joel Rosenzweig

rrVeteran

Marlborough, MA - USA

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Hello Stefan,

What do you mean by "blades not smooth enough"? The heads are perfectly tracked and well balanced, but maybe you are referring to something else?

Regards,
Joel

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03-03-2013 04:50 PM  5 years agoPost 12
Stefan Reusch

rrNovice

Limburg, He- Germany

My Posts: All  Forum  Topic

Hello Joel,
My blades are extrem soft and can hit up and down very easy by Jaw control.

Please look this video from Today. The rotors are not in the same rank at 99% of the flight. Thats one of the things ti flying a tandem Heli.

Watch at YouTube

Regards
Stefan

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03-03-2013 06:52 PM  5 years agoPost 13
Joel Rosenzweig

rrVeteran

Marlborough, MA - USA

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Hi Stefan,

Good video. Do you have another way to explain "rank"? I'm not quite understanding what you mean. Your rotors looks normal to me, and the angles look correct.

I noticed a tail drop when your heli came down from high altitude. It behaved just like mine does in that regard. But overall stability still looks excellent. You had some daring moves, dragging the heli on the rear wheels, backwards. I was concerned you might get stuck, and cause the heli to flip! I am glad that nothing happened like that!

Could you answer the few specific questions I had, regarding your head speed and how much differential collective pitch you use per rotor head?

Thanks,
Joel

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06-09-2014 01:45 PM  4 years agoPost 14
Stefan Reusch

rrNovice

Limburg, He- Germany

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Hello Joel,
Excuse the Long time before answer,i make sure that the System works fine in continius load.
The new Rotor Head is now finish and testing for a Long time, it works.
The Head has a very smooth central Damping, so the Rotor Level (rank, plaine i dont know the correct word) can work very easy for Jaw corrections. There is no extreme load in the mechanic when you fly with this heads.
The dcp is ca. 2° in front rotor and 4° in back rotor.

When there are other questions, please feel free to ask.
i try to answer with my bad english

regards
Stefan

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