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Old Jan 26, 2012, 01:43 AM
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Can a Trex 600 Pro be stretched to a 700?

My 600 is down due to a bad Castle ICE80. So, I was thinking this may be a good time to upgrade it to a 700.

Would the 700's tail fit in the 600's frame without modification?

Would the 700's head or the new DFC head fit on the 600's shaft? I believe it's the same shaft?

I'd upgrade the ESC from the 80 to the 120. And the 600's motor is a 510KV so I think I'm fine there and my 600 is already running on 12S.
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Old Jan 26, 2012, 02:06 AM
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yes the 600 can be stretched just need a 700 boom and TT or belt
imo id not get the DFC head Align recalled the first batch do to yoke bolts breaking
imo get the TracX 600 head Align copied
http://www.nankinhobby.com/Helicopte...prod_6020.html

WAY better head then Align copy
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Old Jan 26, 2012, 02:11 AM
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Yeah, I saw the announcement and had to let my LHS know. Align never even told them about the announcement.
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Old Jan 26, 2012, 03:11 AM
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Yeah, I saw the announcement and had to let my LHS know. Align never even told them about the announcement.
ALIGN recall 700 dfc head but not 600 dfc head. If you check the 600 dfc head bolts are black & is good to fly while 700 dfc head bolts are chrome finished & is under recall.

You cannot use tracx 600 fbl head upgrade to 700. Trex700 main shaft is 12mm in dia.while Trex600 main shaft is 10mm in diameter. You cannot put 700 fbl head onto 600 without modification. You may put tracx 600 fbl head onto original Trex600 & stretch the main blades. But you take risk as original 600 main shaft and rotor head are not designed & withstand the torque & drag force created by 700 main blades. My 2 cents

.. sp you need to extend the boom too even you put in 700 main shaft. I don't think it's worth to do upgrade
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Old Jan 26, 2012, 03:34 AM
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Originally Posted by wlee1017 View Post
ALIGN recall 700 dfc head but not 600 dfc head. If you check the 600 dfc head bolts are black & is good to fly while 700 dfc head bolts are chrome finished & is under recall.

You cannot use tracx 600 fbl head upgrade to 700. Trex700 main shaft is 12mm in dia.while Trex600 main shaft is 10mm in diameter. You cannot put 700 fbl head onto 600 without modification. You may put tracx 600 fbl head onto original Trex600 & stretch the main blades. But you take risk as original 600 main shaft is not designed & withstand the torque & drag force created by 700 main blades. My 2 cents

.. sp you need to extend the boom too even you put in 700 main shaft. I don't think it's worth to do upgrade
you can always get the 7HV head if you REALLY want to run the bigger main shaft but tons of people run 690mm blades on 10mm main shafts
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Old Jan 26, 2012, 09:55 AM
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you can always get the 7HV head if you REALLY want to run the bigger main shaft but tons of people run 690mm blades on 10mm main shafts
From engineering design perspective, it takes into account of aerodynamic, stress analysis, properties and strength of material... in designing and building rc heli. The most important is that they all include safety factor in the stress analaysis and strength of material. Yes, you may strecth the blades and put 700 sizes blades on 600 size main shaft, but you greatly reduce the saftey factor..... and take chance to fly heli.

Why Align, Compass... have their 700 birds use 12mm main shaft and 10mm main shaft for size 600 bird. Why Align use same size of main shaft, 10mm for both 550 and 600 birds. Why Align use different size main shaft for 450 and 500? Why Align use different feather shaft, blade grip and bearings for different size rotor heads?

Tons of people running 700 size blade on main shaft design for 600 bird.... I better be careful.............

s.p. why Align recall 700 DFC head..... saftey issue............
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Old Jan 26, 2012, 08:24 PM
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According to Align:

"Regarding Align’s recently released 700DFC rotor upgrade assembly, there has been an instance reported by customer where a loosely tightened bolt on the pitch link assembly caused high frequency vibration, resulting in material fatigue and bolt breakage from where the thread starts. Due to the concern that this breakage can lead to unforeseen safety issue, Align has modified the grip linkage arm design of both 700DFC and 600DFC rotor upgrade assembly. In addition, the bolt has been replaced with one made from CNC’ed high carbon steel material for improved rigidity and strength, effectively avoids bolt breakage issue.

Caution: Please do not fly before the 700 DFC new parts have been replaced. We deeply apologized for all the inconvenience caused.

For customers who have already purchased the first version of Align 700DFC head upgrade set, please bring the main blade grip arm and the screw to where you purchased of the local distributor to exchange the newly designed screws and grips. This replacement process will start on January 22, 2012. If you have any questions, please contact your local distributor.

You can identify the first version and the newly designed version per the attached announcement."

http://www.helifreak.com/attachment....9&d=1327348701

To the OP .... to run the 700 boom, you'd need to custom made a longer TT. Go down to Dick's Sporting Goods and purchase a raw CF shatt used to made arrow and attach the ends to the shaft. A few years back, we were pretty "an-al" about vibration caused by the longer TT and thus we made TT from CF arrow shaft.
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Old Jan 26, 2012, 08:31 PM
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Originally Posted by chopper62 View Post
According to Align:

"Regarding Alignís recently released 700DFC rotor upgrade assembly, there has been an instance reported by customer where a loosely tightened bolt on the pitch link assembly caused high frequency vibration, resulting in material fatigue and bolt breakage from where the thread starts. Due to the concern that this breakage can lead to unforeseen safety issue, Align has modified the grip linkage arm design of both 700DFC and 600DFC rotor upgrade assembly. In addition, the bolt has been replaced with one made from CNCíed high carbon steel material for improved rigidity and strength, effectively avoids bolt breakage issue.

Caution: Please do not fly before the 700 DFC new parts have been replaced. We deeply apologized for all the inconvenience caused.

For customers who have already purchased the first version of Align 700DFC head upgrade set, please bring the main blade grip arm and the screw to where you purchased of the local distributor to exchange the newly designed screws and grips. This replacement process will start on January 22, 2012. If you have any questions, please contact your local distributor.

You can identify the first version and the newly designed version per the attached announcement."

http://www.helifreak.com/attachment....9&d=1327348701

To the OP .... to run the 700 boom, you'd need to custom made a longer TT. Go down to Dick's Sporting Goods and purchase a raw CF shatt used to made arrow and attach the ends to the shaft. A few years back, we were pretty "an-al" about vibration caused by the longer TT and thus we made TT from CF arrow shaft.
s.p. , from AlignRC,

**Trex 600 DFC

Your Trex 600 DFC arms should already have the upgrade. This was done prior to our first release. Please note that on the DFC 600 Rotor Head the bolts supplied are black. On the 700 DFC they are a chrome finish. So your DFC 600 is good for flight.

If in doubt just look at diagram posted and look closely at the Pitch link bolts that should provide a good visual.

quoted from http://rc.runryder.com/helicopter/t680952p1/
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Old Jan 26, 2012, 09:17 PM
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I think I'd be more concerned about the feathering shaft, grips and bearings than the main shaft when it comes to increased loading. I've stretched a few helis and haven't changed any of these components yet, but mostly on helis that were over-engineered in the first place (e.g. Swift 16, Logo 400), or on ones that had factory stretch kits (Gazaur 480). I think I'd compare the head bits between the 600 and 700 and see what the difference was before I made a decision.
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Old Jan 26, 2012, 09:48 PM
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I think I'd be more concerned about the feathering shaft, grips and bearings than the main shaft when it comes to increased loading. I've stretched a few helis and haven't changed any of these components yet, but mostly on helis that were over-engineered in the first place (e.g. Swift 16, Logo 400), or on ones that had factory stretch kits (Gazaur 480). I think I'd compare the head bits between the 600 and 700 and see what the difference was before I made a decision.
+1, Actually, what you concern on featheing shaft, grips and bearing are related to rotor head which also on the main shaft used to drive the rotor head assembly /w blades on.

Trex-600 feather shaft is 6(dia) x 8(dia) x 93.2mm

Trex-700 feather shaft is 7(dia) x 10(dia) x 106.5mm

You will find out the difference in feather shaft diameter and size.

s.p. blade grips screws are M4 for Trex-600 and M5 for Trex-700, another concern on grip force holding blades.
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Old Jan 26, 2012, 10:40 PM
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Originally Posted by wlee1017 View Post
+1, Actually, what you concern on featheing shaft, grips and bearing are related to rotor head which also on the main shaft used to drive the rotor head assembly /w blades on.
Hehe, I think we're all up to speed on that . The dimensions you quoted are interesting-- so the 700 feather is moderately larger. It might be worth looking around to see if there are other 700s with 8mm FS.

In my case it wasn't so difficult-- the Logo and Swift both had .30/.50 size heads already (e.g. the FS on the Swift is 8mm even though it only started with 520 mm blades).

My point mainly is that if your mainshaft isn't up to it, you'll find out when it stops running true fairly quickly, but that isn't a huge event. However-- when your FS or grips fail, it's pretty spectacular, and you don't want that swinging 700s.
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Old Jan 27, 2012, 12:46 AM
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Compass 7HV uses an 8mm feathering shaft its just longer then the 6HVs
if any one has seen the TracX head its beefy as hell i would have no issues running 690s on that head
the hell people run 625mm blades on the thing at 2500rpm i think it can take 690s at 2000 or so
the Align head is a big ? as its new and imo not nearly as good as the TracX head
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