DFC!? Pah! ......

[Idleup95]

The DFC is heavily criticized by some, espiaclly those who are "Anti-Align"

The fact of the matter is its hit and miss, unless you have tried an Align heli with a DFC head then I feel your arguments are restricted, personally my old 700N DFC flew great in both sport and 3D and my new 500DFC also fly's great, I have never heard of bolts shearing in the head only bolts flying out due to lack of loctight or poor maintenance.

Just because its cheaper then the goblin, compass options dosen't mean its crap it work, don't get me wrong my 600 with the old 3G flys awesome but the DFC is like marmite some love it some hate it.

Just my opinion


John

[waveydavey]

John you just have to look at my sig. There's no criticism levelled at align, I don't use the dfc but wouldn't have a problem doing so either. But the point is that it is an engineering design fault not that it doesn't fly we'll, not that there hasn't been any failures. Nobody has to defend it as there is no defence, and to compare its robustness with a plastic ball link is plain old daft as there is no comparison. The ball links are on all helps because they are a sound engineering mechanical solution, simple

[Benjbrit123]

John you just have to look at my sig. There's no criticism levelled at align, I don't use the dfc but wouldn't have a problem doing so either. But the point is that it is an engineering design fault not that it doesn't fly we'll, not that there hasn't been any failures. Nobody has to defend it as there is no defence, and to compare its robustness with a plastic ball link is plain old daft as there is no comparison. The ball links are on all helps because they are a sound engineering mechanical solution, simple

A sound engineering solution that fail all the time I disagree that there are some loads of the bolt however they are only going to be minuscule because the dampeners in a dfc head are solid, to your previous comment I'm not in anyway saying you are wrong I just don't believe it is enough of a problem to worry about, Its not like align didn't know this would happen they are not idiots but they will of done the maths and decided that it would hold up just fine, you have to replace ball links every year so if people really were worried you could replace the dfc bolt every year :P

I think both HPS and DFC heads are good designs but for simplicity and fly performance I will be sticking with DFC

[Zeeflyboy]

DFC!? Pah! ......

Its not like align didn't know this would happen they are not idiots but they will of done the maths and decided that it would hold up just fine

Just have to correct you there, they didn't do the maths at all (or if they did, they got it wrong).

The first DFC kits came with normal dampers and some boggo standard bolts, which were loaded with shear on the threaded section.

Then they got their first failures, issued a notice about it and sent out stronger bolts with shoulders that extended into the grip arms, and also changed to a solid plastic damper.

So they did in fact get it utterly wrong at first - only when it was out in the wild did their engineering error become apparent to them.

It flies well, and I like it.... however it only makes engineering sense IF you either use a solid "damper", or a link with a flexible shaft (eg compass) and they didn't initially... But now they do so all is fine again, as long as you are happy running a high headspeed for the solid damper.

Edit - out of interest here was their "service bulletin" at the time

[KevDavies]

the dfc system as used on aligns can be complimented, I cant really say cured as that would be false, by introducing a rubber bush at the point where the turnbuckle screws into the DFC arm.

So effectively the turnbuckle would screw into a metal lined rubber bush. This would give a small amount of flew, the amount needed for the feathering of the grips on high head loadings. And trust me even with solid dampers those blade grips WILL be flexing. Introducing a tiny bit of flex into the DFC arm cures it all. The Compass system with the flexible delrin arms is the best solution for the DFC concept at the minute in my opinion.

[Andy from Sandy]

The solution will lie in the design of the single sided motorcycle fork.

http://www.fz6-forum.com/forum/bar/1...ront-fork.html

[raptorheli2]

the BEST solution for DFC is to bin it and put a swash driver on the head, it is purely form over function.

before anyone asks i own a pair of 700's (E and N) and both have DFC's until i figure out something else to lower the head with the driver.

cheers

[BenScoobert]

the BEST solution for DFC is to bin it and put a swash driver on the head, it is purely form over function.

before anyone asks i own a pair of 700's (E and N) and both have DFC's until i figure out something else to lower the head with the driver.

cheers

just sayin'

LowRider.jpg

[tonystevens]

I think what people like (myself included) about the DFC head is how it feels and that is purely down to the lower height of the head. Personally i couldnt give a monkey whether the head uses the DFC links or not and would certainly be interested in a head that was as low as the DFC but used a washout/driver with normal pitchlinks.

[raptorheli2]

i'm sure align will go down the "HPS" route soon to sell some more upgrades. they have been quiet on the upgrade front of late, saying that they don't have one to copy yet....OHHHHH....bitchy! lol

cheers

[tonystevens]

I think KDS do an HPS head for the 700 and i think its might be only 15mm higher than the DFC?

[KevDavies]

Does it make that much difference Tony?? Havin the blades lower down?? Only asking cos mine are a mile high on the Raptor and I think my rappy is OK, but not flown a DFC to compare

[tonystevens]

Does for me Kev, lower centre of gravity, flips and rolls on a dime and piro stuff feels so much better. Think its the reason i keep moving helis on, trying to find something that flys and feels as good as my 700 and still looking lol.

[KevDavies]

fair do's cant argue with that mate!!

[heathy]

DFC!? Pah! ......

Does for me Kev, lower centre of gravity, flips and rolls on a dime and piro stuff feels so much better. Think its the reason i keep moving helis on, trying to find something that flys and feels as good as my 700 and still looking lol.

Here you go Tony, ask and you shall receive. http://compassmodel.de/products/electro/atom-7hv/