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HomeAircraftHelicopterHelicopter Main Discussion › What is "DFC"
09-04-2013 01:00 AM  5 years agoPost 1
AgentOrange

rrVeteran

Jacksonville, Florida

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I have been out of the heli hobby for awhile and im seeing alot of Align DFC stuff and just wanted to know what this is all about.

Trying not to put them in the dirt.

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09-04-2013 01:08 AM  5 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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direct flight control

Bill Whittaker

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09-04-2013 01:11 AM  5 years agoPost 3
AgentOrange

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Jacksonville, Florida

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Ok so what does it mean compared to the older style of flight controls.

Trying not to put them in the dirt.

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09-04-2013 01:12 AM  5 years agoPost 4
AWittleWabbit

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O.C., CA

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Dfc on the left, non dfc on the right.

In a nutshell, dfc has no swash driver. The arms going from the swash to grips pull double duty as a swash driver.

Generally, dfc type heads have shorter masts. Also, dfc heads have very stiff damping.

Dfc or not is a very emotional topic for some people right up there with abortion, religion, and guns.

In my personal experience at the 450 size has been very good. The sky didn't fall and with the right fbl controller its been very good.

Heli-itis sufferer.

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09-04-2013 01:16 AM  5 years agoPost 5
wrongler

rrProfessor

Brewerton, New York

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^^^^^Bingo^^^^^

Bill Whittaker

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09-04-2013 01:18 AM  5 years agoPost 6
McKrackin

rrProfessor

Lucasville,Ohio

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I prefer the swash driver myself...

Avant is going to change that old "DFC have shorter main shafts" thing.

I literally never use the word literally right.

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09-04-2013 01:19 AM  5 years agoPost 7
AgentOrange

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Jacksonville, Florida

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Never mind i just looked up pics of it from readyheli. Wasnt there a heli out there awhile ago that was set up like this. I think it was the Protous.

Trying not to put them in the dirt.

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09-04-2013 01:29 AM  5 years agoPost 8
Eco8gator

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Palm Beach, FL

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DFC done incorrectly + any spindle damping = too much load on the grip arm screws which = crash.

Xera Motors
ProBar
Minicopter
Thunder Power

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09-04-2013 01:34 AM  5 years agoPost 9
AWittleWabbit

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O.C., CA

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McKrackin,

If I had a say in the choice of the two, I would pick the one with the driver. I assume they have the same mast height and damping.

Heli-itis sufferer.

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09-04-2013 01:40 AM  5 years agoPost 10
AgentOrange

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Jacksonville, Florida

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Ok so with the new DFC head there are no head dampers in the blade grips correct?. What is the benefit to this head? is it just a more precise feel to the heli. Just trying to understand the purpose for it.

Trying not to put them in the dirt.

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09-04-2013 01:54 AM  5 years agoPost 11
jcoats

rrApprentice

central VA

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No...compass has been doing the dfc thing for awhile..

The dampener ques,Everything is in the head block. Just like it used to be.

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09-04-2013 01:57 AM  5 years agoPost 12
RyanW

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Edmond, Oklahoma

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Veering a little off-topic, but in general I am not a fan of DFC done with the rigid setup on the blade grip. There is too great of a chance of mechanical interference.

I will say that Avant has something that could make me change my mind. There is some thoughtful design that is going to do some very good things in several ways on the new Mostro head!

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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09-04-2013 03:45 AM  5 years agoPost 13
unclejane

rrElite Veteran

santa fe, NM, USA

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Ok so with the new DFC head there are no head dampers in the blade grips correct?. What is the benefit to this head? is it just a more precise feel to the heli. Just trying to understand the purpose for it.
These heads do still have dampeners in the grips, they're just very very stiff. Mainly to prevent too much flap which can work the arms from the grip arms to the swash and possibly break them.

The idea is to get the rotor disk as low as possible; the more scrunched up towards the rotor disk you can get the weight in a heli the better it's going to fly in general. The DFC head is a kind of kludge fix to lower the rotor disk without having to redesign the rest of an existing machine.

The right way to do it, though, is how Miniature did it with the Whiplash - get everything else as high up in the model as possible (batteries, motor, servos, etc). This gets the CG as high as possible but allows you to retain a good design in the head with standard swash follower arms and traditional links from swash to main grip. Especially the Whiplash electric is designed with everything as smooshed up towards the rotor head as possible. So it doesn't need so short of a mast that you need the DFC kludge fix.

The other drawback to the DFC on a heli otherwise still designed for a traditional head is the increased possibility of a boom strike. This is compensated for with extremely hard dampeners and nutcase headspeeds above 2000rpm.

Avant has the only DFC design I'd consider on a large heli, the one Krack shows above with a composite link that is designed to flex so the feathering spindle can flap without damaging the links. If it works with decent parts prices, the Avant setup will be the way to go with DFC.

Else, I much prefer a good design to begin with like the Whiplash where the CG has been raised by design in the fuselage. And a traditional head that's not sensitive to the stiff arms that double as swash followers...

LS

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09-04-2013 04:01 AM  5 years agoPost 14
McKrackin

rrProfessor

Lucasville,Ohio

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McKrackin,

If I had a say in the choice of the two, I would pick the one with the driver. I assume they have the same mast height and damping.
Pretty sure both heads use the Rigid Core damping system the Aurora uses...Just MUCH larger.

The feathering shaft on the Mostro is the same size as the main shaft on the Aurora...10mm I believe.
And the new main shaft is 12mm.

The new heads are much beefier.

I think the design is a darn good one whichever you prefer.

I literally never use the word literally right.

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09-04-2013 04:22 AM  5 years agoPost 15
whoamis

rrVeteran

san francisco, ca

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Protos doesn't have it; the long links went through a delrin piece with slots. The shaft turned the delrin which pushes the links which turn the swash.

In DFC the links are "rigidly mounted" so that turning the head, specifically the blade grips, induces the links to follow along and carry the swash with them.

oops, bounced it!

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09-04-2013 05:36 AM  5 years agoPost 16
Justin Stuart (RIP)

rrMaster

Plano, Texas

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You can't use dampeners in a DFC head if you are using completely rigid pitch arms. Compass got it right the first time by using dampeners in the head and using flexible pitch arms. The Avant Mostro follows this trend.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-05-2013 01:03 AM  5 years agoPost 17
Gearhead

rrMaster

Vt

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"DFC"

Fly Bar Less

Jim
Buzz Buzz Buzz

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09-05-2013 01:08 AM  5 years agoPost 18
AWittleWabbit

rrElite Veteran

O.C., CA

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Thanks for the pics Mckrackin. That's some pretty robust looking hardware.

Heli-itis sufferer.

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09-05-2013 06:38 PM  5 years agoPost 19
Manny1776

rrVeteran

Melbourne, Florida. USA

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"DFC"
Fly Bar Less
REALLY?

Fly High, Fly Fun, Fly Secure.........Fly 3D!!!! Bavarian Demon USA Team

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09-05-2013 06:45 PM  5 years agoPost 20
McKrackin

rrProfessor

Lucasville,Ohio

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REALLY?
He's technically right.

A DFC head has pitch control link that go directly from the blade grips to the swash...Hence the Direct Flight Control.

On the other hand,a traditional FBL head has pitch control links that go from the blade grips...wait....DIRECTLY to the swash.

So I fail to see how one can be called DFC and not the other.

I literally never use the word literally right.

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HomeAircraftHelicopterHelicopter Main Discussion › What is "DFC"
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