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600 PRO Class Electric Helicopters 600 PRO Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 01-07-2015, 12:12 PM   #501
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Quote:
Originally Posted by anmatheextreme View Post
For anyone that is interested, a couple of days ago I managed to make the main blades and the 105mm tail blades touch during a piro tic toc. I was running 2300rpm with the Align 600mm blades. Fortunately my main blades got away with a couple of surface marks but can't say the same for my tail blades. Strange thing is that I am not using the low DFC head but only the old EFL head. Back to 95s now and 2400 headspeed until I do the tail gear ratio mod. Just a heads-up for anyone that is flying with a similar setup and hard 3D.

it definitely puts an end to the question.
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Old 01-09-2015, 04:34 AM   #502
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Quote:
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For anyone that is interested, a couple of days ago I managed to make the main blades and the 105mm tail blades touch during a piro tic toc.
Yes, that settles the debate.
To be honest after checking the clearance on my own DFC 600 Pro I knew for certain that there was potential for the blades top touch, I could easily make them touch without applying any force, and didnt really believe the few mm extra mast height on the FBL would make much difference... But others said FBL was ok and I couldnt be bothered arguing.

The stretch is remains a viable option that cures the problem completely.
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Old 01-09-2015, 05:49 AM   #503
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And if hadnt happened with an efl head, there would still be a debate on it
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Old 01-16-2015, 12:01 AM   #504
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I'm working with someone that can build us a "plug and play" stretch kit. It would come with boom, torque tube, and tail pushrod. The stretch would be mild, but should provide room to run up to 620mm main blades and 105mm tails. Would anyone be interested in this?
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Old 01-16-2015, 05:07 PM   #505
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It all depends on the price...
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Old 01-16-2015, 05:12 PM   #506
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And then when you crash it, suddenly you have to "un-stretch" it unless the parts are readily available at a shop or direct. So not that sustainable. I guess if your flight to crash ratio isn't that bad it might make sense to mount custom parts.

It's a nice fix though. Something that Align should have done if it had woken up from the coma that is the 600L design.
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Old 01-16-2015, 05:15 PM   #507
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Thats why I want to do it. Align should have fixed several issues for the 600L but instead they chose to "put lipstick on a pig"

I'll know pricing when we source parts and make prototypes
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Old 01-16-2015, 05:25 PM   #508
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And then when you crash it, suddenly you have to "un-stretch" it unless the parts are readily available at a shop or direct. So not that sustainable.
What's 'not sustainable' about it? You can make any of the required parts from 700 Pro parts in less than an hour with no more tools than a hand file and a hack saw. It would be even easier if you had the damaged 'stretch' parts to use as a template.

The idea of a stretch kit sounds good for those who don't want to make everything from scratch.
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Old 01-16-2015, 05:32 PM   #509
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Quote:
Originally Posted by Grumpy_Old_Man View Post
What's 'not sustainable' about it? You can make any of the required parts from 700 Pro parts in less than an hour with no more tools than a hand file and a hack saw. It would be even easier if you had the damaged 'stretch' parts to use as a template.

The idea of a stretch kit sounds good for those who don't want to make everything from scratch.
For cutting the boom a pipe cutter is much better. Just take your time and it comes off clean.

But the torque tube has integrated ends. So you just need to find a compatible substitute, or find a way to remove and mount the 700e TT ends.

You prob don't need to change the boom supports.

I actually shrunk my Fusion50 boom since it greatly improved elevator performance. You get more pendulum effect with the longer boom. 600e had a nice short boom which was one of the best flight characteristics of my 600e pro when I had it. It just needed a better tail gear ratio!
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Old 01-16-2015, 05:50 PM   #510
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Quote:
Originally Posted by OnTheSnap View Post
For cutting the boom a pipe cutter is much better. Just take your time and it comes off clean.

But the torque tube has integrated ends. So you just need to find a compatible substitute, or find a way to remove and mount the 700e TT ends.
I've done it, no pipe cutter, no issues with shortening the 700 TT once I figured out how. Copied from previous thread:


I decided to do a 'stretch' on my Align Trex 600 Pro so i could fit larger tail blades (105mm up from 95mm) plus use some 623mm main blades that I picked up. The standard set up with 600/95mm blades has only marginal clearance between blade tips so not much room for any increase in blade size.

To fit these blades safely would require a longer tail boom. Luckily the boom, torque tube and tail control pushrod from a Trex 700 are more than long enough and of the same diameter, so hopefully could be made to fit.

Hopefully this might be a useful reference for anyone here thinking of doing something similar.

So the proposed stretch spec is:
  • Heli: Align Trex 600Pro DFC
  • Main-blades: Edge 623 LE FBL
  • Tail-blades: Edge 105mm
  • Tail boom, Torque tube and pushrod: Trex 700e cut down

I wanted to minimise the boom increase as far as possible to prevent the heli becoming tail heavy, and also to stop it looking like a stick-insect:rolleyes:, so going all out and fitting the much longer unmodified 700 boom was not an option.

Minimum for the stretch is the sum of the main and tail blade length increase, so thats 23mm for the main plus 10mm for the tail = 33mm. I rounded up to 35mm.

The work only took one evening. The boom has to be cut down and a longer locating slot cut in the front to fit into the 600 boom mount. I cut it down from both ends to make sure that the writing on the boom didn't end up being partially covered by the pushrod guide (just me being fussy). The holes for the front locating screw and the pin that locates the tail drive were match marked after trial fitting the boom and then drilled. This was all pretty easy.

Cutting the carbon pushrod down was easy enough and some heat got the threaded rod and metal end cover off without too much difficulty. Only thing to note is that the threaded rod and ball joint on the 700 pushrod are bigger than the 600. I drilled out the 600 plastic ball joints to fit the thicker 700 screwed rod.

The trickiest job was shortening the torque tube that drives the tail rotor. The tube is thin wall aluminium with the end drive spigots screwed into the tube with an internal left hand thread on the tube end. The problem is that once you cut the torque tube down you lose the threaded portion, and cutting a new fine pitch left hand thread wasn't an option with the tools I have. No real choice then but to simply press the drive spigot into the tube secured with green loctite. I actually flown it this way six or seven times and it held up ok, but then got worried when someone told me that their similar stretch had failed at this connection, so took the tube out and pinned through the joint with a 2mm bolt. Hopefully it's bullet proof now.

And that was about it, here are some photos:

700 and 600 tail booms side by side.. the 700 is much longer:


Locating slots, the 700 is shorter:


Shortened and with longer slot cut:


Comparison after cutting down to 35mm stretch:


Pinned torque tube:


Blade clearance after stretch:


Ready to fly:
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Old 01-16-2015, 06:28 PM   #511
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Nice work. Looks easy.
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Old 01-20-2015, 10:25 PM   #512
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Nice work on the stretch!
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600 PRO Class Electric Helicopters 600 PRO Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.

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