DFC!? Pah! ......

[trillian]

ok I missed the bigger picture there I must be blind

I dont seem to be saying anything..I am saying its just a link bewtween the Bladegrip arm and the swash removing the clutter of the other systems ,there is no advantage in flight controll at all,just cleans up slop if its a good system with good bearings in the downlinks

OK, then we're not at any disagreement regarding a performance advantage. In which case I am a bit baffled as to why you felt the need to 'disagree' with me, when in fact we're not disagreeing.

What you will find is that because the DFC design allows a lower head / higher C of G, that is precisely where any performance benefit lies. That's why Align makes a special DFC main shaft and the head height issue was precisely the subject this thread was started about.

Here is a quote from Aligns blurb on the DFC head if you don't believe me;

"●700DFC flybarless rotor head system utilizes extreme low CG design, effectively reduces resistance during flight, increased flight responsiveness and precision, resulting in superior 3D performance and unimaginable flight speed.
●700DFC not only improves on T-Rex700’s performance, the lower CG design is also capable of surprisingly fast speed, not to mention the extremely attractive design."

My point about the 'bigger picture' is that the goal of higher / lower C of G (depending on how you're looking at it) can be acheived in different ways. The TDR is a great example of a design where the rigidity and closeness of the rotor hub is at the core of the design and what goes with that is a lower placement of the boom.

Peace, love and purple microdots

[jwatts007]

Volt needs to get back too his drawing board...that head on the 1000 looks awful.....

[Guest]

Re: DFC!? Pah! ......

Volt needs to get back too his drawing board...that head on the 1000 looks awful.....

Not sure if that's a joke or you just have to see it in person, but it's reaalllly nice! :-) 'course never flown it but would like to hear from those that have

[AcidDrink]

Has anyone see Smaktalk episode 30, Bobby Watts explains why he think DFC is an unsuitable design for anything bigger than a 450.
Anthony

2 bolts only + huge torque applied to them = not good. Don't need Bobby W. to explain that .

I like how these heads look, but if I had one on my heli, I'd be replacing these bolts every 20 flights. I was looking at Trex 550 for my beater heli, but DFC head was a deal breaker. Having said that, people fly these heads with good success. I am just being a bit paranoid.

[VOLT]

Volt needs to get back too his drawing board...that head on the 1000 looks awful.....

and your head looks awfull to me too!!
and the only way I would be able to redesign your head to suit my liking is to smack the toilet seat over it while its having a drink !

see I can be nice too! hahahaha

[Kiwi64]

Volt needs to get back too his drawing board...that head on the 1000 looks awful.....

Will be waiting to see yours when you've designed and built it yourself !!!

[KevDavies]

Ive just watched that smacktalk issue on the back of this, and A: ive a good knowledge of fbl and am confident i can setup and tune one know I understand it all. and B: Agree with the dfc argument. A lot of stress on a £0.005 bolt!!

The way id change the dfc design is id introduce another bearing/hinge into the grip arm so that any movement from the swash can be transmitted to the grip yet any teetering will be catered for by the arm pivoting at the correct point

[tonystevens]

I think the DFC design has proven itself by now not to be an accident waiting to happen, how many bolts have you heard about breaking in flight scince the original bolt/arm upgrade in the 12+ months its been out?
ill stand corrected if im wrong but I cant recall one ??
Yeah on paper it may be a bad design but in practice it works and works bloody well! Your all paranoid lol!

[KevDavies]

I know what your saying Tony, but in that video Bobby has a valid point that if your pulling enough force to feather the blades your gonna have em leading/lagging when you dont want it.

Its a design that works and works well, and lets face it it looks awesome. Just a little tweak to that design could cure all the bad bits imo

[JoeBailey]

DFC!? Pah! ......

I like the design on the G4 and aleez rush. Using the swash driver as a mixing lever to allow shorter arms on the blade grips.

[tonystevens]

Just a little tweak to that design could cure all the bad bits imo

If it aint broke, dont fix it i say

[milly0812]

DFC!? Pah! ......

I've been flying the dfc on my 600 and 450 for hundreds of flights now without a single issue. Maybe I can't push it hard enough so here's Jamiem trying to get it to fail .......he failed too.

Like tony said ' if it ain't broke'

http://youtu.be/rQNlvg8QUJc

[KevDavies]

Im only goin on what Bobby Watts said in the video! Ive not flown a dfc head anything yet!

But he has a point in what he says even if in reality its not necessary. Its got my techical hat on tho thinking how it could be done............ Its gonna be a bloody clever design to take the stress (IF ANY) off that bolt.

giving me summat to do tho so im happy

[raptorheli2]

DFC can be summed up thus, it is an inferior design to a conventional head for flying-fact.

SAB realised this and now sell an "HPS" which is simply a normal head. it is amazing goblin owners are now paying for a "normal" style fbl head.

the DFC difference you feel is only because the head is lower as the mixing arms have gone, nothing else to it. if you lower an "HPS" head it will feel better as the phasing won't change under load like DFC.

cheers

[Mike Sanders]

It's obvious when you look at one that the blade grip bolts have to carry a lot of force. Some of the early Align bolts did fail (I think only on the 700 but I am not sure). Align brought out a mod and they all seem to work very well. I know some very good pilots who like DFC and their helis look very good in the air.

Don't take my word for anything though. I still hover around gently with my flippy floppy flybars (to coin a phrase).