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> T-REX 700 > Using the New 700x FL Hub in the 700E DFC Pro
davehour

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Guayama, Puerto Rico 00785

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Hi guys,

I have a 700E PRO DFC I converted to FL with the FL head released about a year ago. What I want to do now is, use the lower profile FL hub just released, which I believe it's used in the new 700x and 700L V2 models.

I checked the helis manuals and I should have no problems using the new FL hub with the DFC main shaft and DFC linkages, but I'll have to bore the DFC main shaft threaded holes (the DFC main shaft must be used with the new Lower profile FL hub) to use bolt that comes with the new FL hub, which passes through the FL hub and main shaft, contrary to the original DFC and FL hub design, which uses two bolts on each side of the hub that screw in the main shaft.

In addition, I ordered the new "counter" linkages because I believe they are turnbuckle type. Are they turnbuckles?

I'll appreciate your help letting me know if what I got is what I need to use the new FL hub.

Thank you very much,

David

For your reference, following are the parts number in question:

-H70H004AX 700X FL Designed Main Rotor Housing Set H70H004AX

-H70Z007AX 700X Counter Thread Main Linkage Rod Set H70Z007AX

12-17-2016 05:26 PM
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davehour

Elite Veteran

Guayama, Puerto Rico 00785

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Hi,

I made the investigation and have found the following:

You can install the lower profile FL head of the 700x in your 700E DFC's helis using some parts. The cost will be around $80 including the new counter linkages (turnbuckles) and buying the new DFC main shaft the 700x uses, but you can use the original DFC linkages all around and work out the original DFC main shaft, and save some money. More info below.

The new main shaft is basically a DFC main shaft with the upper threaded holes bored to accept the shouldered 4mm screw that now pass through the new FL hub and main shaft. So if you workout the threaded main shaft and use the DFC linkages, the cost will be less than $50.00 for the head conversion.

Summing up, you will end with the same head the new 700x and 700L V2 helis have.

Following is the list:

H70093A
Align Main Shaft Set (700E DFC)
Total: $19.99

H70H010XX
Align Control Arm Set (700X)
Total: $20.99

H70H004AX 700X FL Designed Main Rotor Housing Set H70H004AX
$32.99

H70Z007AX 700X Counter Thread Main Linkage Rod Set
$15.99

Regards,

David

12-20-2016 12:22 AM
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davehour

Elite Veteran

Guayama, Puerto Rico 00785

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Hi guys,

This is the 700X and 700L V2 head in a 700E PRO DFC which had a FL head. The FL head is 20mm taller than the DFC head, but the new design of the FL hub and DFC main shaft, bring the head back to the original DFC height. I never liked the look of the heli after I installed the FL head, being so taller.

Of particular interest of the new FL head of the 700X and 700L V2 models is that now, the ball link that connects to the grip ball link, is installed in the outer hole of the awash plate. This raises the cyclic deflection almost 3 degrees than when the ball was used in the inner hole. This change will make the cyclic more responsive.

I haven't flown the heli yet. I'll let you know how it does when I have a chance to fly it.

As you can see in the pictures, turnbuckles are now used in the 700X. They are 42mm long vs 44mm of the DFC ones. I see less threads are inside the ball ends of the servos linkages. I might install back the DFC ones and use the turnbuckles in the grips only. What do you think?

Nevertheless, it's still a good upgrade as it makes the zero collective setup a breeze. and so the tracking adjustment.

Hope this help, and feel free to post your comments.

David.

12-29-2016 10:39 AM
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Andy from Sandy

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Bedfordshire, UK

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Will also give possibly bad geometry figures in fbl controllers with the links to the outer hole on the swash.

When you keep referring to the fl hub is that what most of us call the head block or rotor housing?

12-30-2016 04:08 PM
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davehour

Elite Veteran

Guayama, Puerto Rico 00785

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Yes, that's what I'm referring to.

I was thinking about that (FBL setup). I'll run the setup again as this changed the 6 degrees reference most FBL units use.

This new design is good for the 700E as the cyclic deflection, using the inner hole, is somewhat limited due to the binding of the ball links touching the frame due to the servos position. With the inner hole, I could only get about 10.5 degrees of cyclic deflection with 13 degrees of collective.

What do you think about the linkages threads exposed?

12-31-2016 11:56 AM
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iyoy

Veteran

Bacolod City, Philippines

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TRex Dominator 700L TOP

Following is the list:
H70093A
Align Main Shaft Set (700E DFC)
Total: $19.99
H70H010XX
Align Control Arm Set (700X)
Total: $20.99
H70H004AX 700X FL Designed Main Rotor Housing Set H70H004AX
$32.99
H70Z007AX 700X Counter Thread Main Linkage Rod Set
$15.99
Will this work with the 700L Dominator TOP?

iyoy

12-31-2016 12:34 PM
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davehour

Elite Veteran

Guayama, Puerto Rico 00785

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Will this work with the 700L Dominator TOP?
Yes

12-31-2016 07:30 PM
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Andy from Sandy

Elite Veteran

Bedfordshire, UK

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What do you think about the linkages threads exposed?
It depends on how much is in the rod end but looking at a picture you have more than half of the thread in the rod end. They look substantial so I doubt it is a problem. You have clearly done this before as you have evened up the amount showing at each end.

The force is not a bending one. I have only just thought whilst writing this that it might be an interesting test to see how much weight it takes to push the link on further or pull it off the rod.

With the help of the ferrules the plastic can't distort or crack.

01-01-2017 11:00 AM
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