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HomeTurbineAircraftHelicopterTurbine Helicopters › Have a couple of questions on Vario Turbine mechanics
03-04-2008 03:48 AM  10 years agoPost 1
autorotater

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California

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I am building the Vario 1/6 scale turbine huey. I am close to being ready for a test flight but I'm not sure what swashplate type to program in my Futaba 9chps. I also don't know which servo is ail and which is elev.

My other question is on the base of the rotorhead there is a metal pin sticking downward but I'm not sure what it for. Here are a couple of pics of what I am talking about. Any help would be greatly appreciated.

Thanks,
Dan

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03-04-2008 03:57 AM  10 years agoPost 2
autorotater

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California

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Not sure why the pics didn't work. I will try to post them again.

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03-04-2008 04:19 AM  10 years agoPost 3
mcfast

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Quebec Quebec Canada

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Are you using a scale head ?

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03-04-2008 04:23 AM  10 years agoPost 4
heliman53

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Charleston, Sc

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Since you have the block with two pins for driving the pitch compensator you will not need the one pin above. Just remove it and use the clamp ring alone to clamp the lower portion of the rotor head. Craig B

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03-04-2008 08:35 AM  10 years agoPost 5
MattJen

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UK

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I'm not sure what swashplate type to program in my Futaba 9chps.

are you using 3 or 4 servos on the swash ?

If 4, then it is SWH4

Matt

All The Best

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03-04-2008 02:34 PM  10 years agoPost 6
autorotater

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California

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Man you guys are awesome. I thank you so much for the help. As for the swash it has four servos. So I will use SWH4. Now how do I figure out which servos are ail and elev so I know which channel to plug each one in to. Sorry for all the questions but this one has me stumped.

Dan

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03-04-2008 03:31 PM  10 years agoPost 7
heliman53

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Charleston, Sc

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Servo on front of swash is elevator, servo on rear of swash is elevator 2, on left of swash is aileron, right of swash is collective pitch. Craig B

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03-04-2008 06:20 PM  10 years agoPost 8
MattJen

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UK

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here is where the channels go, in Futaba

AELERON - 1 AND 6

elevator 2 and 8

Throttle 3

Rudder 4

Pitch chan 5

All The Best

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03-04-2008 07:34 PM  10 years agoPost 9
modtron

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Oxford. UK

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Sorry guys, this is not a 4 way mix as normal.

As far as I am aware, the 9CHP does not offer the required mixing for this system.

It requires 4 servos, but with a built in 45 degree cross offset included into the mix.

For forward cyclic all four servos move - the front 2 go down and the rear 2 go up.
For left cyclic, the left 2 go down and the right 2 go up.
For collective, they all work together in the same direction.

Futaba offer this mix on the 12FG, 12Z & 14MZ.
It is called the H4X mix.

I belive that some higher spec JR sets also offer this type of mix.

modtron
Oxford UK

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03-04-2008 08:33 PM  10 years agoPost 10
MattJen

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UK

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Hi Modtron

I am confused, I have 4 servo CCPm and i am using the FF9 Super,

The servo's are at 45o ( as at each corner of a figurative square)

2 go down when either left or right input is added and then they all move for pitch..

Matt

All The Best

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03-04-2008 08:49 PM  10 years agoPost 11
modtron

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Oxford. UK

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Hi Matt,

Now you got me confused.

Just been going through the manual for the Futaba FF9 Super - the mix SWH4 is a normal style 4 servo CCPM mix.

So for forward tilt - the servo at the front go down and the rear servo would go up. This is not what the H4X mix does.

Looking at your second picture, for this Vario system, the front 2 servo would need to go down and the rear 2 would need to go up.

What mix are you using then ???

modtron
Oxford UK

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03-04-2008 10:21 PM  10 years agoPost 12
MattJen

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UK

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So for forward tilt - the servo at the front go down and the rear servo would go up.

Sorry Modtron, you aint going mad, it was me mis understanding your comments, when you said on a that special mix 2 servos move at the same time i thought you meant as one goes up the other goes down for left and right...

On the second picture ( RHS) the HOTCAt uses a 45o offset ( same as the EC135 you setup using hellitronix), where the swash plate for left and right goes off at an angle but the input the blades is 90o,

I havent got that special mix you are on about, the benefits i have found on that special mix for the 12MZ and 14MZ is it eliminates any kind of interaction using the 4 servo setup...

On my FF9 super i get a small amount of inter- action but it is only at full pitch and full left and right, which on a scale application as you well know, i will never use that much travel to perform a manouver..

But on my Acrobatic where i do roll, i do notice the servo's drain a bit more current, so that interaction does become aparent the more aggressive the manouvers you perform...

Matt

All The Best

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03-04-2008 10:53 PM  10 years agoPost 13
Richard

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Scottish Borders, U.K.

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I used to have an FF9 for my 4 servo eCCPM Powercat which required HW4 swash setting,I'm sure that the FF9 does not have HW4X swash option. I now use a 12FGH which has both HW4 and HW4X options. I'm sure there are posts somewhere which mentions using the Helitronics mixer with the FF9 due to the lack of swash plate options.

Oh **** ! this is going to be expensive?

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03-05-2008 02:13 AM  10 years agoPost 14
autorotater

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California

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Matt, your pic on the right looks like the same set up as my mechanics. So what I am gathering is if I use SWH4 on my 9chps I will be ok without any special mixing? The servo position in the reciever is very helpful info so all I would need to know now is which servo of the four are elev and which are ail right? Thanks so much for all this help guys. I was getting frustrated and was thinking my project was coming to a halt.

Dan

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03-05-2008 05:16 AM  10 years agoPost 15
Joel Rosenzweig

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Marlborough, MA - USA

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Those mechanics have 45 degrees of phasing built in. If you were running a multi-bladed head with those mechanics, you wouldn't need to add any additional phasing to make it work. If you run a 2-bladed head on it, you need to remove the 45 degree offset electronically. The Helitronix Mixer will do that nicely for you. If your radio supports 45 degree phasing, then you can do it in your TX instead. It depends on the radio.

Joel-

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