High-Quality FBL Flybarless Head for T-Rex and HK450 heli.

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OK

Dec 05, 2019

Perfect

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perfect

Nov 13, 2019

it good

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An affordable way to give a new lease of life to a 2005 T-Rex clone

Jun 01, 2019

I picked this head up for my 2005 Ark X-400 after the original flybarred plastic head finally gave up, in a rather spectacular fashion, after many years of faithful service. The structural failure that my previous rotorhead suffered made me commit to metal components instead of plastic ones on all dynamic parts. I also decided to commit to a Flybarless system after having flown the helicopter flybarred for over a decade, which brought me to this head.
For me, this head is pretty perfect as it’s allowed me to affordably bring new life to what I believe is an old cheap T-Rex clone. I’ve now got it all set up correctly and it’s giving me that ‘locked-in’ feeling that Flybarless proponents so often talk about and has allowed me to do away with all of the mechanical mess associated with flybarred flight.
I’m loving it, but there are some pitfalls to be aware of. My version didn’t come with the rubber bushings that sit inside the head, so you'll need to pick those up as extras. Fortunately, I had the ones from my old rotorhead so that wasn’t a problem for me, and it’s still probably cheaper to get this head and the separate bushings compared to other more expensive heads.
I also wouldn’t fly this head at all without lots of Locktite. You probably shouldn’t fly without Locktite anyway, but I found that some of the parts on this head would vibrate loose quite quickly under test conditions without it. I still check the parts before and after every flight to check that they’re still firmly in place, but the Locktite appears to have done the trick and they haven’t come loose since.
In summary, I probably wouldn’t recommend this head to any serious, experienced heli pilot, and I’ve no doubt that they wouldn’t pick it anyway at a price like this. For a relative novice like me though, it’s a perfect way to keep an old whirlybird going until such a time that I commit to a more expensive machine. Not a bad product by any means, and perfect for what I needed.

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Received in very well packaged box

Jan 29, 2017

While it hasn't flown yet it has been dry assembled everything fitting very well and slopless in this set. I have put up a jpeg of the entire package laid out. The feathering shaft is now the same as the V2 shaft 4mm x 44mm x 3mm stepped ends. shims are 8mm x 5mm x.05mm, I have 5 of those. Blade shims are 11mm x 3mm x .03mm. Washers for screw setting grip to feathering shaft are here. Also included but not shown in their picture is connecting rods for swashplate to blade grips. Machining on this set is superb, Radial bearings are smooth running and notchless. Flange bearings are the same. Thrust bearings are separately bagged from the rest as well as from each other. Screws I have a large selection of rcscrewz which I will take the sizes from to use. JPEG is titled what came with the head. I'm very happy with this 12 dollar investment.

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Arbor press needed

Nov 17, 2016

If you use a half ton arbor press to install the bearings than the washer isn't needed, fingers aren't enough to seat the bearings the final fractions of a mm. This also preloads the arm when the screw is tightened which makes for less slop. Care must be taken to support the arm at 90 degrees to the standoff while tightening the screw if the arm is skewed while tightening the arm will be "springy" (just undo it and re tighten the screw if this happens)

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Arbor press needed

Nov 17, 2016

You need an arbor press (a bench vice would also work) to install the bearings in the upper arms, just using finger pressure doesn't seat them in the last few fractions of a mm and the arms will bind with the screw tightened. If you give the arm a good hard squeeze (hard but not so much that it crushes the part) on the press it fully seats the bearings and no bearing shim is necessary. This also makes for a slightly preloaded arm which greatly reduces or eliminates sideways slop (depending on tolerances). If the bearings are "springy" in a spot it means the arm was tightened onto the standoff while slightly skewed, make sure the arm is 90 degrees to the standoff while tightening the screw and it should rotate freely. You can get them partly tightened and moving freely without fully clamping the head and then put the hub on the mainshaft and tighten it the rest of the way.

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Customer Rated

Oct 14, 2016

Well !
I eventually. Put it together but I had to use other bits from my heli spares.
Must be bits missing.
Apart from that the. Blade grip bearings have play in them !
Also small Allen bolts poor quality.

To be honest, save your money and buy a better one !!.
Sorry hk but come on this isn't what's described is tight tolerances.

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Certified Buyer Rated

Jun 29, 2015

Super Umbaukit fr HK 450 Pro (Dmpfergummis fehlen) Fliegt mit dem Beast gleich um einiges ruhiger als mit den Paddeln. Kann ich sehr empfehlen.

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Certified Buyer Rated

Mar 07, 2015

The quality of this head set looks good, there are missing rubber head dampers, but i fitted them from old HK head...Would be better to use new ones... It comes with long PRO version feathering shaft... Will use this with long blades 360mm and stretched tail boom tarot 480...

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Certified Buyer Rated

Jan 09, 2015

Everyone says this is a great deal, but you really get what you pay for. I spent a couple hours trying to shim the head properly to eliminate the radial play within the grips without success. There is a appalling amount of play. I haven't test flown it yet. I'm guessing it will fly ok with a very mushy cyclic feel because of the head slop. Also, the screw heads seem to be made of Swiss cheese, so take care when applying torque to the screws, they strip easily. Better yet, replace them with better ones. The mixing arm bearings will seize if you tighten them too much, I just thread locked them and used minimal force to tighten. The kit comes with everything except the flap dampers. My advice is to try and find the stiffest flap dampers you can to try and eliminate that slop. Thicker the better. The machining and finish looks decent. However, the quality difference between the RJX head (which I own several of) and this head is apparent. Recommended for the casual helicopter flyer who crashes a lot. Otherwise, for the rest of us who prefer something of quality, avoid this. I'm not sure what I was expecting for the price. However, given the high praise by what I've read on the reviews, I did expect more.