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Home✈️Aircraft🚁HelicopterPhotos and Videos › Head fails again lol.
04-06-2012 05:26 AM  9 years ago
Jag72

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South of Boston

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Shape heli
Funguy

The shape does not have the same head design

I have a shape and have never heard of a boom strike with one or had one with mine

The shape shares the same design as the tdr really

I haven't heard of any goblin heads failing..anyone have info on this ?
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04-06-2012 08:23 AM  9 years ago
3dgimble

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Rochester

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The shape head is not the same exact design but it is a low profile,

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04-06-2012 12:33 PM  9 years ago
michaeljheli

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australia

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hey sorry for the loss im running kbdd green dampeners in my trex 600 nsp DFC you got a make sure the blades are super tight had no probs YET
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04-06-2012 01:10 PM  9 years ago
fastflyer20

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N. Tonawanda, NY

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Goblin down here, a friend had the head fail where the adjuster screws into the vertical arms. He has shared email with at least one other one failing. If you saw the design you would say it is not the best.
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04-06-2012 02:59 PM  9 years ago
Jag72

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South of Boston

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Shape Heli
funny thing is that my Shape measures EXACTLY the same blade to boom distance as the DFC setup and I have never heard of a boom strike incident with the shape.

So if the DFC is failing it's got to be failure or flex...
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04-06-2012 05:10 PM  9 years ago
Sam2b

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Tacoma, WA

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I just have to say again the original Align 3G (FBL) head is just fine with the swash driver assembly. The shorter 3G (FBL) shaft works just fine and flys like a dream. With flybarless systems you should be able to make any heli roll and flip super fast with any head (at least Vbar does). And the handling difference the lower head may provide... well, apparently just isn't worth it for this heli._Sam B_
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04-06-2012 06:38 PM  9 years ago
Santiago P

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Dayton

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Let me make a few things clear.

The lower height of the blades over the boom is not the issue, although it does increases the risk of a boom strike.
The head/spindle dampening is not the main issue causing the boom strike either.

The no swash follower design is based on a “rigid” control arm that is placed where traditionally a double ball link is used for ‘allow” the articulation of the blade arm and consequently the entire disk to become off plane with the swashplate while maintaining “linear” control. (Compass excluded, their link is made to flex)

The rigid L shape link is now obligated to take the bending forces produced from the rotor down to the swashplate.

Two things now occur:
1. the L control link is bent back and forth (regardless of the damping) changing the effective length from blade grip to swash.
2. everything from the swash ball to the blade control arm is being stressed anywhere from 30 to 60 times a seconds depending on the cyclic input and duration.

Many items in aerospace are designed to work in bending i.e.; spars, blades, beams, elastomeric dampeners, etc. A primary control link is not one of them.

You can make up whatever you like of this info.

The common “theme” you hear from SAB and Align is that you must make the blades very tight and use kryptonite dampeners. Well that will minimize the axle movement for a while, which in turn keep the link bending to a minimum, for a while. Like all high energy systems, that will work the dampeners very hard, they will get hot and give or wear and give more; and the axle will again float as intended. The bending cycles will resume and nature will take its course.

The wear and failures on the control links will vary greatly from case by case.

Nobody is stopping you from driving a Ford Pinto, but if you feel lucky, go ahead . . .

Santiago
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04-06-2012 08:31 PM  9 years ago
Justin Stuart (RIP)

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Plano, Texas

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I don't get it. What was wrong with the Align head that had the integrated swash driver?Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives
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04-06-2012 09:09 PM  9 years ago
Jag72

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South of Boston

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Align head...
Okay...now you guys have me spooked

I am going to take off the DFC head and shelf it for now...I just ordered the parts to put together a Gaui X7 head to replace the DFC heads
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04-06-2012 09:30 PM  9 years ago
Ghostrider

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San Diego, CA

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I am going to take off the DFC head and shelf it for now...I just ordered the parts to put together a Gaui X7 head to replace the DFC heads
Is that design actually any better? From my "LACK" of knowledge, the principle design seems the same to me. Am I missing anything?
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04-06-2012 09:37 PM  9 years ago
Jag72

rrProfessor

South of Boston

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Gaui X7 Head
The Gaui head works off the same principle as the shape and TDR heads...it still has balls on each end so the link is allowed to pivot a bit...the DFC and Goblin design are using a rigid mount on the main grip side...this is what people are claiming is the failure point

The TDR and Shape Helis are a proven design...they simply do not fail

look at these pics...of my shape and TDr ...you'll see the difference


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04-06-2012 09:42 PM  9 years ago
raynman

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Lyall Bay - Wgtn - N.Z

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Wot a nice colour scheme you have on your TDR - I always thought DFC = Direct from Compass ( they tried to copy the design?)
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04-07-2012 12:04 AM  9 years ago
Sam2b

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Tacoma, WA

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Rotor Plane Angle
raynman, I hope you don't mind me borrowing a snapshot of your video. In this case what we can see here is the hard up elevator causing the rotor plane to tilt the spindle within the dampeners coupled with the blade flex = CHOP! The boom appears mostly straight with no flex. (I know we already know this)

_Sam B_
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04-07-2012 12:10 AM  9 years ago
Santiago P

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Dayton

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That is not normal flex, that is a runaway blade. Watch the other side diverging opposite meaning one blade is no longer controled and it pitched over.
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04-07-2012 05:29 PM  9 years ago
Sam2b

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Tacoma, WA

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From reading other posts in this thread, others relatively haven't had an issue with tight blade grips. To me it is still not worth it because it causes wobble at conservative head speeds, or at least during auto rotations (in my experience). I also believe the type of blade used matters in how/when it lags or pivots in the grip like this. For example, when I accidentally ran 17 degrees of collective pitch with 2000RPM head speed (not including combined cyclic degrees) I did not strike with the original CY690mm flybar'd blades. Interesting topic, and good learning material._Sam B_
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Home✈️Aircraft🚁HelicopterPhotos and Videos › Head fails again lol.
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