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> Helicopters & Parts > Helicopter Kits > Electric Helicopter Kits


HK-450TT PRO V2 Flybarless 3D Torque-Tube Helicopter Kit (Align T-Rex Compat.)

HK-450TT PRO V2 Flybarless 3D Torque-Tube Helicopter Kit (Align T-Rex Compat.)
HK-450TT PRO V2 Flybarless 3D Torque-Tube Helicopter Kit (Align T-Rex Compat.)

Our most popular HK450PRO helicopter kit now offered in a flybarless torque tube version!

HK-450TT PRO V2 Flybarless CCPM 3D Electric Helicopter Kit (Align T-rex Compatible). Modeled on the famous and proven Align T-Rex 450PRO V2 Flybarless helicopter kit.
Take a close look at the head and tail of this awesome machine. It's ultra light, yet rigid design is strong enough for even the most skitzophrenic of 3D helicopter pilots!

When comparing helicopters, carefully look at the tail and head unit. Our 450PRO V2 Flybarless is FULLY 'PRO' and does not use parts from previous models.

*Now featuring an upgraded metal tail slider and tail slider control arm!

• Newly designed low wind resistance flybarless rotor head assembly with reduced distance between rotor head and frame, effectively lowering the CG for better 3D performance.
• Single piece integrated design of main bearing block and servo mount.
• Single piece integrated design of anti-rotation guide and gyro mount.
• Single piece integrated landing gear.
• High precision flybarless head system.
• Newly designed high resolution swashplate.
• Single piece battery mount with integrated canopy mount designed to bring CG closer to disk plane.
• Highly rigid frame with single piece carbon side and bottom plates.
• Highly efficient shaft driven tail design.
• Weighted tail rotor blade grips to repel centripetal forces.
• Straight-up in-frame alloy rudder servo mount for improved geometry and better CG.
• Newly designed aerodynamic canopy.
• Newly designed high strength main blade grips.
• Upgraded metal tail slider and tail slider control arm.


Length: 635mm
Height: 230mm
Main Rotor Diameter: 710mm
Tail Rotor Diameter: 158mm
Motor Drive Gear: 13T
Main Drive Gear: 150T
Autorotation Tail Drive Gear: 106T
Tail Drive Gear: 25T
Drive Gear Ratio: 1:11.5:4.24
Weight (w/o power system): 530g
Flying Weight: Approx. 640g

HK450TT PRO V2 FBL Helicopter Kit
Glass Fiber Main Blades
Tail Blades
All Necessary Hardware

Required items:
Brushless Outrunner Motor
Flybarless Control Unit
Lipoly Battery (2200mAh 3S)

PRODUCT ID: 155000030

Shipped from:
International Warehouse



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Further discounts available for registered & logged-in customers.
 Customer rated
Total of 143 discussions.
Peter  1 points - 1/31/2016
A rogue ESC/BEC seems to have burnt out two servos (connecting to left & rear swashplate). What spec should I look for in replacements ? Thanks
SamdeJ  37 points - 8/30/2015
So far I am impressed with this heli. stripped gears few times, and I replaced them with original T-rex parts. I am using open pilot CC3D flight controller. here is a short video
Robert  6 points - 8/23/2015
Has someone problem with tail authority? My heli want spinning CCW only.Even I keep ruder stick right. Seems pitch is not enough and force from main rotor is higher. I have attached pics. Any solution? Please help. target=_blank> target=_blank>
 SamdeJ 37 points
I took the tail gear completely off, and used a shaft from a CD rom use dramel tool to cut the shaft. its very tough. now I have enough travel to do some aggressive flying.
 John Banion 168 points
This is a proven design with no tail authority problems. When you 1st setup the tail start with gyro in "rate" mode. In this mode it will always return to center(neutral). You should then physically trim it(via the linkage so there is no CCW piro. If you face both tail blades forward they should divirge about 10-15 degrees. This is the neutral position. Next you should set your tail travel limits again. Now you can setup your headlock mode. Do a hover test and keep increasing the gain until it starts to hunt(wag). Then turn the gain down until it stops hunting. Your done. And don't trim it.
 John Banion 168 points
Also make sure you didnt slide the tail rotor hub too far onto the tail shaft. You want it as far out as you can get it. Further, your tail servo should have enough throw to move the tail pitch all the way to its limit. You then set a limit in the flybarless system stop it just before it binds.
 SamdeJ 37 points
Yes.. you are right, its a good design for Align trex, but the hobby king version had lot of problems, mine came with missing shims in the Torque tube assembly, so the angled gears were skipping, loose head screws, and tail did not have enough pitch, the blades were absolutely garbage. But Hey.... for the price.. I am happy with it, I overhauled the entire captor, replaced angled gears with original Trex parts, new Main Blades, changed main gear to helical, I am using open Pilot CC3D for Flybarless controller, Now I can fly this thing Hands free..
 John Banion 168 points
O yea. I know. Ive build like 4HK helies. I probably replaced all the main gears, some of the TT gears. Ive been lucky with parts not missing. This is more an issue with Gart the manufacture. And generally there still a good deal even after you replace the iffy stuff. All my helies are franken helies as with lots of tarot/vwinrc/align and HK. CC3D nice? I'm mostly AR7200bx and clones and one Kbar.
Lucas Ricardo  10 points - 8/3/2015
It came 1 week ago, been flying with it, and is very impressive the flight quality, and the parts quality, very satisfied, here's my setup: RotorStar 4400KV Battery 3S ZOP 2200 MAH 40C EMAX 2.4KG cycle servos HK Coreless 2.7kg/0.07 sec tail servo HK 40A UBEC ESC MINI KBAR 3 AXIS gyro
Matthew  2 points - 7/15/2015
Hi, Built this a while ago but having trouble with set-up due to bad meshing of the torque tube gears at the front of the tail boom. Seems like other people have had this issue, Ive tried putting tape around the tail boom to ensure a tighter ft and I the tail boom is not moving but still the gears wont mesh properly. Any ideas on how to fix or which T-Rex parts I could swap in to fix this? Thanks.
 SamdeJ 37 points
I had the same problem. you ahve to take the gear assembly at the top tail boom completely apart, and use 3mm hole 4mm outer about 0.3mm thickness shim on the angled gear to push it down. i will post a picture soon.
 John Banion 168 points
You could always convert to belt drive. They tend to run a lot smother.
Customer Reviews
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Overall Rating
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This kit is excellent value for money. The new head is smooth and works well. The swash is very good and smooth, The tail has a new type slider on it and mine has no slop, a first on this size of heli, the tail holders seem to have a counter weight system built into them. I am amazed at what you get for the money. The blades that came with mine are good quality and usable.The torque tube seems a good quality unit and the drive is free from friction and hopefully static. All in all I am well pleased with the kit and look forward to getting it in the air.

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got this today, it is such a difference to my HK450 V2, looks ace. Te screws are a lot better than on the v2 models. The FBL head looks also better than the one I have for my v2 but I did not fly it yet.

I'd prefer if they would include a glass fibre canopy but will just get one with my next order.

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Finished the kit assembly and have now flown around 15 flights, sport flight and a lot of flips/inverted/rainbows/loose tictocs/punchouts etc Quality overall is pretty nice and looks great in black, one carbon frame half is rattier than the other (as usual with hk) but the mechanics of the frame, head and most of the tail are really solid. Head is rigid with no slop and feels nice and high quality. The all metal tail slider mech is a nice touch although the one problem I've encountered so far is that the brass tail slide bushing broke in half during the first test hover meaning the tail control arms weren't in contact with the slider anymore. Lost tail control in a low hover because of this so watch out. Never had this problem on other clone 450 tails so hopefully it's just my particular part that was a dud. Other than that the heli is great and flies insane with the following loadout. Tarot/HK ZYX 3axis flybarless controller TP 450-Size 2415-06T Brushless Heli Motor 4400kv get this motor it's awesome (13t pinion = insane headspeed power no bogging at all at 12 degs pitch) Hitec HS-65MG on cyclic (very nice, smooth and powerful although corona 919MGs would work as well for a lot less) HGD digital 261HB for tail Hobbywing Platinum/Turnigy K-force 40amp esc Orange Rx Sattelite Nanotech 3s 45-90c 2200mah lipos (5mins flight if doing 3d type headloading continuously and everyth

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the quality is amazing. the head has absolutely zero slop in it, is very rigid, and smooth moving. i can tell it will be great for 3D. i still need to check for WARP in the gears but the tail gears came slightly warped, a few teeth are stripped at the root and is not smooth at all. yours may come without it bent like that, but the hk helicopters usually just need align gears and youre good. the TT gears are usually soft and would not recommend flying if they dont seem in perfect shape. to be honest, i did not like the 450 pro i got last year but this one looks like a step up. will be using my zyx and nano techs!

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- The carbon fibre frame is a little bit rough on the edges. Need a bit of sanding. Appear not as well made as HK450 V2 frame.
- The flybarless head looks very well made. The swashplate is very good, tight tolerance, not as loose as V2 swashplate.
- Torque tube tail end is good too.
Can't wait to fly it !!

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