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HomeAircraftHelicopterAlignT-REX 600N › What is the correct DFC main mast for this frame?
11-03-2013 11:22 PM  4 years agoPost 1
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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I have a 600N that I bought used.
But, I do not know the exact "model" of the frame.

When I bought it, it had a 3G head on it with the stock swashplate.

The main mast and the extra main masts that came with the heli extend down through the 1-way bearing hub and down into a 3rd main mast bearing block.

I bought a DFC head DFC swashplate from a guy on RR. It is pristine and looks like it was new out of the box.

The main masts that I had are all much to high for the DFC head, so I bought a 600N DFC main mast from the LHS.

The 600N DFC mast is clearly laser etched "600N DFC" on the shaft and the part number on the package is "H6NH001XXW".
Every place I look says this is the correct main mast for the 600N DFC.

The problem is that it does not extend down into the 3rd main mast bearing block. It barely sticks out of the bottom of the OWB hub.

I've attached some pictures - hopefully that clarifies the problem.

I have taken one of the old mainmasts that extends down into the 3rd bearing block and modified it to correctly positions the DFC head - I flew it yesterday successfully.

But, if you look at the picture the include dimensions, even the 600N DFC mast has the wrong distance from the welded ring to the top of the OWB hub.

What is going on here?

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11-04-2013 06:44 AM  4 years agoPost 2
l0n3i200n

rrApprentice

South Africa

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Align actually made a mistake on the first versions of the DFC nitro main shafts.
The 600N DFC mast is clearly laser etched "600N DFC" on the shaft and the part number on the package is "H6NH001XXW".
If you put the normal EFL shaft next to the H6NH001XXW shaft you will notice they are exactly the same.

They have corrected it now
http://www.helidirect.com/align-600...set-p-29945.hdx

The new part number is H6NH002XXW

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11-04-2013 04:47 PM  4 years agoPost 3
ticedoff8

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Morgan Hill, CA. USA

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I checked the online hobbyshop's site for the H6NH002XXW, and that is in stock, but it is $3 more than the H6NH001XXW.

It seems strange that the online hobbyshop would list a part that is totally worthless. Does the H6NH001XXW actually fit anything?

If I use their "Part Finder", and I follow the trail down the "Nitro Heli & Parts">"TREX600N">"600N DFC Head" I get a PDF page out of the Align manual. If you click on the tag next to the picture of the main shaft, you get a popup for the H6NH001XXW.

I can only find the H6NH002XXW if I use the search box and search for "H6NH002XXW".

It is frustrating that I now have to spend $4 postage to ship back the wrong part. Then spend $4 to have the correct part shipped.

That is assuming they will refund / replace the H6NH001XXW at full value.

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11-06-2013 01:42 AM  4 years agoPost 4
Zaneman007

rrElite Veteran

Texas - USA

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Feel your pain
The main shaft for the 600N, 600N DFC, 600 EFL, on and on are not all the same, as you have noticed.

You probably have either the 600N that originally had a flybar and was converted to flybarless or a 600N that came with the old non-DFC flybarless head which is why the 600N DFC shaft doesn't fit.

I converted the original 600N to a DFC. I had to cut 20mm off of the main shaft and drill a new hole for the head bolt to slide into to get it to work with the DFC head.

I don't think that there is a 600N main shaft conversion table that will tell you what shafts work with what models with what heads.

You may want to contact the seller and ask what model it was originally.

If you don't have the 600N frame that was designed specifically for the DFC head, I'm not sure that your are going to find a main shaft that will just slide in (plug and play).

Good luck

Old Guys Rule!

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11-06-2013 10:51 PM  4 years agoPost 5
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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The H6NH002XXW is almost perfect.

Only two problems:
1) It doesn't work with my Lynx 0079 main mast bearing blocks.
The issue is that the top Lynx block is about 2mm higher than the stock Align top bearing block. This causes the lower jesus bolt to be too high in the OWB hub - and I cannot get the bolt in. If I change to the Align top bearing block everything is perfect.

2) With the Align top bearing block in place, the mast is shorter than I accounted for. I now have to lower the swash about 4mm to get the blades to 0 degrees at mid stick.
I have already changed out the DFC links "turnbuckles" to simple 3mm x .5 screws that are much shorted then the turnbuckles. That worked with my modified shaft. But the Align H6NH002XXW is even shorter than my modified shaft.

But, it is clear that the H6NH002XXW is the correct main mast for this frame if I didn't have the Lynx main mast bearing blocks.

The big problem now, is how do I adjust the front swash A-arm to get the swash 2mm lower?
It looks like the link on the top of the A is already screwed in as far as it will go. There is most certainly not 2mm more I could screw it in.
I have to assume there is a newer version of the A-arm that is lower.

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11-07-2013 01:13 AM  4 years agoPost 6
Zaneman007

rrElite Veteran

Texas - USA

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I'd recommend starting from the bottom up.

I had to use a grinder to cut my shaft down to size. Then you have to drill a hole for the head bolt. It is important that the geometry is correct. The A-arm is not really adjustable. Then it's a matter of getting a couple of turn buckles that fit.

The other solution is to sell the kit and get a 600N DFC kit, but where is the fun in that.

Old Guys Rule!

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11-09-2013 02:46 AM  4 years agoPost 7
bshinn

rrNovice

Charlotte, NC

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Check with Ron Lund. I did a 600N DFC conversion about 2 yrs ago. He had custom machined mainshafts for about $16.00

Search on the Freak, plenty of posts with the exact measurements. IIRC you need to cut 20mm off the 3G shaft & redrill the jesus bolt hole 10mm down from the top.

If you get the numbers confirmed, they're easy to modify.

The elevator "A" arm can't be adjusted. You need to get the correct shaft to make it work

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