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02-24-2013 08:03 PM  5 years agoPost 1
RM3

rrElite Veteran

Killeen, Texas - USA

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Ive been looking to convert one of my helis to FBL...but the cost of the FBL heads for a 600 to 700 class varies by as much as $130...

I want to go with a head that is commonly available as far as parts go...and that seems to be Align....

Are all the DFC FBL heads as bad as they say they are?

Would a DFC head (600 or 700) be fine on a gasser that flys mild 3D?

or should I stick to the FBL heads that have the integrated swash driver?

thoughts?

showing a preference will only get you into trouble, 90% of everything is crap...

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02-24-2013 08:23 PM  5 years agoPost 2
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I am not crazy about DFC, there are a few reasons some manufacturers are going back to more traditional heads. I would think one of the biggest DFC detractions on a gasser is the need to run very hard dampers.

You may want to consider an Align non-DFC head. The RJX are decent at a fair price too.

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02-24-2013 08:51 PM  5 years agoPost 3
Justin Stuart (RIP)

rrMaster

Plano, Texas

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The original Compass combined swash driver/pitch links used a flexible Delrin coupling. The new DFC heads you see in most helicopters today use completely rigid all-metal pitch links and as a result develop metal fatigue that eventually result in complete failure. Is it really worth risking your entire helicopter just to eliminate the "hassle" of using a dedicated swash driver?

Fast forward to 1:15.

Watch at YouTube

Avant RC
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Thunder Power RC
Kontronik Drives

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02-24-2013 09:13 PM  5 years agoPost 4
RM3

rrElite Veteran

Killeen, Texas - USA

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so what I'm getting from you guys so far is that the DFC heads are still having issues and that a swash driver is the way to go?

showing a preference will only get you into trouble, 90% of everything is crap...

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02-24-2013 10:14 PM  5 years agoPost 5
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Compare the pictures of the Compass head on the left with the Align head on the right. Notice how the Compass head uses flexible Delrin rods to connect the main blade grip pitch arms to the swash plate? And notice how the Align head uses rigid aluminum rods to connect the main blade grip pitch arms to the swash plate?

When the main blade grip dampeners do their job and "dampen", where do you think those side-to-side forces go? In the Compass head, they flex the Delrin rods, but in the Align head, they simply lead to metal fatigue and eventual failure of the metal control rods. Align has tried to release thicker versions of the all-metal control rods and harder plastic dampeners, but the control rods will still be subject to a lot of sideways shearing forces.

If you can find a DFC head which uses either steel dampeners with zero flex, or plastic control rods that flex with the dampeners, then that will be an OK design, but combining rubber dampeners with solid aluminum control rods is a recipe for eventual control rod failure (and eventual boom strike).

Having a swash driver integrated with the head block works well, and it is not particularly complicated. I think DFC is a fad, and will eventually pass.

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02-24-2013 10:42 PM  5 years agoPost 6
Ravenhyper50

rrKey Veteran

Canada's Capital

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in the Align head, they simply lead to metal fatigue and eventual failure of the metal control rods.
I and many others use the DFC heads and have yet to see, read, or witness
"metal fatigue and eventual failure of the metal control rods"

Please show me a link to said failures of metal control rods

Don't link the V1 bolts problem either because those issues have been fixed!

HATERS GONA HATE !

DFC has been used on gassers with no problems I have seen Century G30 with sk-540 600 DFC head works great no reported problems.

I run a DFC head on my 1.05 powered vision .90 also no problems beating on it hard. and many many HAPPY people flying their helicopters with DFC heads.

Just not right reading about said "failures" when the people preaching don't use it, does not even own it or, have experience with said "failures"

If set up correctly there is no issues or flaws with this design.

High head speeds are not needed either with DFC! 1700RPM no shakes

At RC scale no problems, full scale, now we talk problems and flaws

Cheers,
Raven

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02-24-2013 11:33 PM  5 years agoPost 7
theriddick45

rrVeteran

United States

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You can use a DFC head with a regular main shaft non DFC and regular non DFC arm with a follower. Look a my pics I did it and I can use the hard dampeners or the soft one even the red f3c one with out a problem. The head with hard dampeners will go as low as 1300hs and it flys fine but lower HS then you get wobble. Is not a gasser but is weights 12 pounds is a 800e size machine.

Hope this help!!!!

Suzi Janis 800e & 700e 3blade both w/Ikon

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02-25-2013 03:00 AM  5 years agoPost 8
Santiago P

rrProfessor

South West, Ohio

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The RJX head is your best solution, it includes a follower as well. The sell themfor 10mm and 12mm shafts.

The post above was a DFC converted to normal head using the RJX follower and V2 arms.

santiago

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02-25-2013 03:43 AM  5 years agoPost 9
DEDO

rrApprentice

FREDERICA, DE.

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Last summer I flew the hell out of a Helibug 700 gasser with a KDE XT DFC rotor. With Rpm range of 1450-2100.

Peace Out BOBBY D.
"GOBLIN PRo GASSER"
ZeN G290,HC3SX,MKS,
Maidened 8/24/12 FL

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02-26-2013 05:27 AM  5 years agoPost 10
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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does compâss sell a dfc kit for 10mm

spending time, paying attention

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02-26-2013 01:12 PM  5 years agoPost 11
Doug Darby

rrVeteran

Dallas, Texas

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Yes the 6HV head should work.not sure if they have a "kit" per say.

doug

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