TAIL FIX for higher head speeds!!!

[Finless]

Yo Hurricane 550 fans.....

OK Last weekend I was testing with a Z30-1100 and when I got head speeds up to 2300 or higher I was having tail kicks which was clear the stock GAUI tail was having a hard time handling the increased loading. Tail kicks like this are a clear sign that the tail bearings were locking up not allowing the grips to turn easily anymore.

So I decided to have a look today and see how I could fix this problem as I want head speeds above 2300.

A PERFECT solution presented itself by using parts from my Rapotr 50 / E-620. Turns out the Raptor tail hub and grips are a perfect fit on the Hurricane. Even how they attach to the shaft is the same design! Also there are NO geometry changes what so ever. The only change is the tail rotor disk is now a little larger in diameter but not enough to worry about at all.

You will see in my video why the Gaui tail wont handle the higher loads using a more powerful motor. It is designed with no support of the inner races of the bearings JUST like the old Align 450 hub and Logo14 stock hub. That design is a known issue when going above 2100 head speeds.
Gaui needs to look at making a thrust bearing tail for this as an upgrade.

BUT in the mean time a Raptor hub and grips will solve all this for you. It uses lager bearings and the bearings inner races are supported internally by the hub! These parts are CHEAP too.

Anyway the video about this is in my Hurricane 550 build series here:
http://www.helifreak.com/viewtopic.php?t=33603

Direct link to the video is here:
http://video.helifreak.com/?subpath=finless/hurricane550&filename=tailfix.wmv


If you want to see how the Raptor tail hub is assembled see my Raptor e-620 tail build video series here:
http://www.helifreak.com/viewtopic.php?t=35541

Direct link to video here:
http://video.helifreak.com/?subpath=finless/raptor_e620&filename=tailassem.wmv

Enjoy!
Bob

[Turbojoe]

Bob you are a heli GOD! :noteworthy

While at present I'm not interested in high head speed I am interested in safety and reliability. This mod may be overkill for me at this point but I'll probably do it anyway. Thanks for another informative video.

Joe

[Piranha]

Thank you, Bob
GOOD MOD :)
I am waiting for raptor hub and grips also :mrgreen:
Another thing that I found-the tail case by itself is also not enough solid!!! If you try to swing tail rotor and shaft from side to side by your hand, you will see flex in tail case :( I think that it is not so good and GAUI need to make metall tail case as upgrade :dontknow

[Finless]

FYI while I have not checked it yet myself I am told the boom diameter is the same as the Trex600 so that tail case might work.... I might look into that later.

Bob

[Piranha]

FYI while I have not checked it yet myself I am told the boom diameter is the same as the Trex600 so that tail case might work.... I might look into that later.

Bob
Good Idea, but Trex600 boom is 21.5 so It seems that Hirobo Sceadu Evo 50 parts must fit, the boom is 21mm as hurricane

[tungym]

Finless, I got the exact problem in Hurricane as well as my Trex600. The symptom is sudden loss of tail control on rudder stick input , despite the tail is hold by the gyro. The symptoms aggrevate on higher headspeed as you mention. Sometimes, it expresses as sudden 180 degree yaw on fast reverse flight.

My Trex 600 is old version with 2 ball bearings. I change one of the bearing to 3x8x2.5 thrust bearing and now it locks solid. The problem is tightening the hex screw will compress the thrust bearing and I need some CA to hold the hex nut in a slight loosened fashion. I know this is not a good idea, but it works.

Now ,my Hurricane also has this problem after 100+ flight. Though physically the bearing looks/ feels normal but I am pretty sure they are worn.

I will definitely try your raptor way of modification. Thanks

[tungym]

I also find that the new Align Trex600 tail grip "may " also fir and it comes with thrust bearing.

I have no idea whether it fits on Gaui but I will try this weekend.


http://www.align.com.tw/shop/images/function/h60109_3.jpg

[quickster47]

Dedicated Hurricane Enthusiasts,

I knew this would come up so I did some searching this morning on the big (I) and found the part numbers and got some prices from the Thunder Tiger web site. Should be able to get better prices but this is at least a starting place.

PV0148 Tail Rotor Grip $7.10
PV0151 Tail Rotor Hub $6.00
HMV1050ZZ Bearings 5x10x4mm $18.47
HSEZ-10B Self Tapping Screw 2x10mm (no price found)

So, using all new pieces would cost you about $33 for everything.

Carl

[Finless]

Yes the Align thursted tail MAY work but there will be a geometry change as the grip control arm is "centered" on the grip and the Gaui / Raptor are offset to the outside. Thus the Align may not give you enough pitch towards the hub. However it may still be OK. I looked at it yesterday but didnt mount it.

FOR SURE the original non-thrusted Align 600 tail will NOT work as the pitch slider control arms wont line up with the slider control hinge. To use that you need the longer Align brass sleaves and they wont fit in the Gaui grip control hinges as the diameter is too big.

Bob

[Finless]

Thanks for looking up the part numbers quickster47!

The bearings are the most expensive but for better prices you can get these at other places like www.vxb.com

Bob

[AdrianM]

I just ordered the Kasama thrusted rotor grips and center hub for the Raptor 50 for my Hurricane :glasses2:

I also have a 6S pack of Kokam 3200's on the way. I see 2500 rpm and 6 min fights in my future :smokin:

[Piranha]

There is another part from Raptor that fits!!! I broke tail pitch fork and replace it with Raptor's (PV0542)
http://www.infinity-hobby.com/main/images/heli/Raptor/PV0542.jpg
It fit like a glove, you just need to heat it a little to press fit on a bushing!
Raptor Tailshaft also fits!!!! it is about 5mm longer but it is not big problem!
I have already ordered metall tail pitch fork and bushing from Raptor, I'll try to install it soon
(PV0439)
http://www.infinity-hobby.com/main/images/heli/Raptor/PV0439.jpg