HobbyKing 450 5-Blade Rotor Head

 Truckzilla 21 points

Im new to helis so my theory may be wrong, but more blades would need less pitch as the load is being shared?

 ESPIE 101 points

This ias already an extented arm, so you don't need to make a 90°* turn...

 Manuel 19 points

Hey if you are looking at the blade directly it's to the left do not just lock it to the one directly below

 ESPIE 101 points

Sapre ? Buy a new one at this price, and you will have plenty spare parts :-)

 alex_it1162 6 points

Do you have a photo of the assembly of t-rex 450?

 gman4reel 134 points

make sure your swashplate setting are set to 120 degrees and about 45 percent

 Todd 7 points

I've tested mine with an all in one Spectrum Head/Tail/recieve gyro in a HK 450. works well very stable, but the tail needs more strength. Looking into getting a 4 bladed tail. so far all I have found is CNCheli and they are back ordered. I might try the 3 bladed tail but was going for the Scale look on my Magnum PI MD500E.

 Paramanic 25 points

Todd did u ever get the 4blade and how does it fly if u did?

 J.Ubeda 184 points

I have one and i have use it with 330 and 325 blades with some problems on tail autority. I think it will work better with 300mm blades.

 jaime 1 points

no no i mean a blade brand helicopter the blade 450 3d not the blade dimension

 J.Ubeda 184 points

it supports any standard blades for 450 helicopters but you must think that more lenght, more tail problems (you can replace tail blades with more longer too to compensate)

 jaime 1 points

no i was talking about if this will fit in helicopter: www.link i will use standard leght blades 325 or 300 mm i jus want to know if it will fit mi helicopter

 J.Ubeda 184 points

If blade 450 rotor axis have same lenght and radius, it will work as is. If lenght are different, but same radius, you can try to fit only head on de blade 450 standar axis. Other case, it don´*t works.

 jaime 1 points

wich is the radius? of this head? and also ill will need flybarless contol unit right?

 J.Ubeda 184 points

not, radius of axis of 5 blades rotor are 5mm and head fixation hole are at 17mm from top (if this hole don´*t match your axis, you cannot fix the head.

 J.Ubeda 184 points

You don´*t need flybarless control, but it´*s very recommendable

 jaime 1 points

if the holes arent the same but the axis is i can use tha shaft that came with this head?

 J.Ubeda 184 points

If your shaft have same diameter (i have done wrong measure, 5mm are diameter, not radus, scuse me) you can fit the rotor on your hely, but you will need to fix it in some way, as i think ring on top of fusselage and pinion fixation on bottom are not the same as TREX and HK helicopters on your heli.

 J.Ubeda 184 points

But i think if your shaft are same dimeter, you can fix on it only the head and swashplate and you will only need to correct command links lenght

 Heinrich 2 points

no, because you have other servo-positions

 J.Ubeda 184 points

I think your head cannot be unaligned, better i think you have unbalanced blades.

 equinox 2 points

The head was not aligned as I said. The blades were balanced. What I did was disassemble the whole thing. I squeezed the clam shells completely closed then using a great amount of force pushed the naked head onto the shaft, aligned the holes in the shaft and head then stuck the bolt in and put the nut on loosely. I then installed the shaft in the heli. Using the transmitter I spun up the head looking at the wobble. It is easy to see the wobble at high speed but it is hard to keep track of it as it slows down and stops. When I could track it I clamped a pair of vice grips to the top of the head and wrenched it in the right direction being careful not to bend the shaft. It was a slow process but I finally got a good result. Of course after reassembling the head I had to re adjust the tracking from the beginning. The story has a happy ending. I flew the heli for 2 complete batteries last weekend.

 davidross222 21 points

The main rotor housing on mine is machined oversize by a few thou, so it wobbled on mast. I wrapped the shaft with a single layed of some shim brass and reassembled. Tight as a drum now. Don't ever force anything! These heads rotate at nearly 3000rpm - so if anything let's go it's not pretty.

 J.Ubeda 184 points

Yes it increase lift, drag and improve agility. it is more stable than 2 blades flybarless, but don't so stable as normal 2 blades rotor.

 boredom.is.me 88 points

This DOES NOT improve agility.

 J.Ubeda 184 points

I have use Carbon fiber 320mm from hobbyking and it works well but it makes excesive torque. 300mm blades must work better.

 budblade 5 points

yes. you've added lots of weight and lift to the heli. Smaller blades offset that.

 boredom.is.me 88 points

Less pitch will also help with the torque.

 gone flying 2 points

I agree!I keep checking in to see if one is available for my carbon fiber HK500TT.Would like to build this bird but will wait until one is available.Will continue to enjoy my HK500GT untill then !

 Roger 5 points

CNC helicopters can supply

 Keshka 16 points

Are you talking about how to mount the EBAR or how to assemble the 5 blade head? The EBAR is easy. Put it as close to the center line of the main rotor as you can.

The rotor head can be assembled two ways, both work fine. You can do it per the HK photo with the blade control arms leading the blades or (more traditional) arms trailing the blades. just be sure the drag link is positioned to clear the pushrods as much as possible (you turn it over on the shaft to change from lead to lag) then l

 thorian 138 points

So Will this head allow a heavier lift capacity? If paired with a multibladed tail rotor to offset the torque? I would really like to try building a 6C 450

 J.Ubeda 184 points

I think you have same problem as me when commencing with this rotor...few experience...you have taken teory and apply to this rotor...but you have confused one think: the command must be 90º before the blade, not after the blade as you show on your photos. Your mounting i think works rotating on oposite mode as you think (if it is not command links interference problems)

 The General - x5 140 points

I had this setup as seen in the pictures flown a couple days already. This worked for me. The command arm being at the trailing edge worked better for me because the tilt angle on the links were lower. If I had the command at tr leading edge. I would have a hard time getting the pushrods go negative pitch as the angle is too steep. It all depends on how you phase the thing. I've done mine up according to the awash movement on a blade 400 and blade mcpx both of which are 3D capable.

 Closeratio 14 points

It's more targeted for scale flying, but 3D flight would be possible with decent servos. It probably wouldn't be quite as responsive as a flybar setup or a normal 2 blade flybarless setup, though.

 JCunny 6 points

Do not use for 3D!! She is a scale head. You will crash and burn your heli doing 3D with this one...

 The General - x5 140 points

Hey I got mine setup today for doing 3D after changing the linkages and pitch adjustments while throttle slider was at 50pcnt up and throttle hold on. Yeah it can negative pitch about -20 degrees. Will test soon though.

 J.Ubeda 184 points

This that you describe is not wron: command must be anticipated around 90º from blade on flybarless rotors. Exact angle for fine adjust depends on other variables and flybarless controler sould have a "phasing adjust" to do this.

 ant-dodger 4 points

By the way, they are "Flybarless". It would be nice to organise them in the "Flybarless" subcategory (of the "Helicopters & Parts" category).
I'm interested to try 5-blade and 3-blade (also 3-blade tail rotorhead). HK doesn't have so far.. I found at other sources, but they are 3 or 4 times more expensive!
Can anyone of the shop team advice when the HK 3-blades show up?
Please also organize them in the "Flybarless" menu.

 J.Ubeda 184 points

If you don´t use flybarless stabilizer...you will crash surely.

 matthew 5 points

you dont have to but it will be more stable and less "twitchy" if you do. I do not have a flybarless system and it is kind of a challenge but still flies.

 dacalap 69 points

this rotor head work perfectly with a 2 blades tail rotor.

 Jennifer M 16 points

2 blade tail works great on my heli, You should have no problem with the tail holding just turn you gain up on your gyro, hope this helps

 J.Ubeda 184 points

It works with tail rotor with 2 standard blades, but using 68mm tail blades you have better tail response.

 wifehatesmyhelis 37 points

Use tail blades from a 500 size on it and it will do fine. But you can buy 4 blade tail rotors for under $60 which will work much better than a 2 blade. Remember you have to lower your head speed and change all your pitch and throttle curve & AFR settings to be more docile. You power this head with a 2 blade speed your helicopter will destroy itself.

 Zan 15 points

Thanks for all the replays! Where can I get a 4 blade tail rotor?

Thanks!

 J.Ubeda 184 points

Try cnchelicopter. He have too many options

 savage_basher 12 points

when oh when are you going to produce one for the hk500 cmt with the matched scale blades to add to a nice scale 500 size fuselage i am holding off from ordering my 500 cmt tt until their is a scale head to order with it

 wifehatesmyhelis 37 points

The head is inexpensive, just buy another one for parts. But if you need parts like blade grips, screws etc. they are standard 2 blade parts available at any Hobby Shop.

 The1CZ 349 points

I guess buy noe more head a sparepart, it is cheap anyway*)

 CAYESA 303 points

Yes, but it's out of stock and I need only one little part to use my helicopter. This happens buying cheap chinese ****.

 The1CZ 349 points

Thats why I always buy 2:)

 CAYESA 303 points

But if I must to buy 2, I prefer buying a quality one with spares disponibility.

 The1CZ 349 points

it is always question what is better... my head even didnt fly for real till today.. no time for it.. and I have even steel improvement the original was realy nasty cnc ****... but I think I had bad piece*( what rpm are you using for head?

 CAYESA 303 points

Still unused. I was verifying the screw retainer and one screw was broked inside the holder shaft. Impossible to get out the broked part, I cutted the shaft and replaced with a longest screw, but I'm not sure I can fly with it.

 J.Ubeda 184 points

More lifting power...and more drag and much more command speed. You must put about 1/3 pitch relative to 2 blade standard rotor pitch curve.

 ze bebert 1 points

not a good idea to use the stock blades. you will have problem with you AC. i experienced 5-blade rotor on 450, to have a nice fly, you will have to go thru a big setup on you heli, hight W and low KV motor, plastic scale blade "soft" and a flymentor... i can give you all the reference that i bought here on HK.

 jmcintosh 16 points

Have a look at some of the U-Tube videos of 5 bladed heads. They are not a straight swap. I agree with the use of scale blades and a flybarless gyro. Depending of how good you are you may get away with regular tail gyro but multi blade heads have strange pitching moments in forward flight according to a full size pilot on a Eurocopter AS355 with three blade head.

 kobusv 7 points

it is advice to do so, the 5 blade rotor head are just to sensitive to fly without a flybarless stabilizer

 woodbugs 19 points

It is also difficult to get enough phasing on the head without the links binding if you do not use a FBL device with phasing adjustment.

 Machiel 8 points

I tried without the flybarless stabilizer, its very sensitive. Just touch even the rudder and the heli almost goes out of control. Landed the heli and aborded the project. Will make a great ceiling fan though lol

 lt188 19 points

Head speed should be adjusted if you are using the standard blade...using it in this 5 rotor head will give you more lifting power on the same rpm then loosing the tail... Before making any changes on your transmitter, try to hover it first for you to feel how much is really needed for the adjustment. enjoy the hobby!!!!!

 Curtis 5 points

You can use a smaller pinion gear to reduce the head speed. Also, use larger tail blades to get more authority. Consider also the scale length** shorter blades take less power to spin up. So with the greater lift of 4 or 5 blades all of these option are availible to you.

 Shad 7 points

Plan on using standard 450 size 325mm at first. Once I am happy with these I may switch to a smaller more scale blade.

 J.Ubeda 184 points

You don't need a multiblade tail rotor, but is very convenient to use more larger tail blades. I use carbon fiber 68mm tail blades from hobbyking (hobbyking product id 10828). Use of barless rotor without electronic stabilization is very "hard", but i have read about someone who do it. He says that with very little command at aileron, elevon and pitch and usin exponential rate he can control it. I will not do it, i think is too much easy and cheap (because less crashes) to use a electronic esta

 wifehatesmyhelis 37 points

You will not need a stabilization system if you phase the head properly. When using a 3,4,5 blade rotor head you have to lower your head speed. All my 4 & 5 Blade helicopters use 11 tooth pinions. You will also need to lower your throttle & pitch curves. It is not necessary to change tail blades or rotor system. Just keep the main head speed high enough to turn the tail system fast enough. Get a fast digital metal gear servo too.

 Edwinpogi 44 points

Thanks to all who responded to my inquiry. Happy flying.

 Daniel 1 points

Look up RC-help on youtube at http://www.youtube.com/user/RcHelpDotCom Very good info there on Heli setups. Also Multi blade head phasing at www.link

 J.Ubeda 184 points

Advantages...i think none...two blades barless rotors have advantage of less components, less drag, more autonomy and agility...five blades have more agility, but too much more components and higer drag and weight... and, if you crash, too many blades broken. I have one of this 5 blades rotors but i buy it only to make a scale Sokorsky S67 model. I have do some short flights with it and motor and ESC are very hot. I have retrofit to original V2 rotor to fly without problems.

 woodbugs 19 points

Advantages are scale look and better load lifting capability (when provided with sufficient torque). Disadvantages are the loss of stability unless assisted by a flybarless system, more complex/involved setup, and reduced tail rotor authority.

 wifehatesmyhelis 37 points

5 Blade helicopters require lower head speed, lower pitch settings, less aggressive throttle curves and smaller pinions. Also needed is larger ESC and larger mah batteries. My throttle curves on my 5 blade 450's is 40pcnt max. Maximum pitch is 6 degrees.

 christiano 76 points

yes, works great, but is not original align

 J.Ubeda 184 points

Yes, i have use it on HK450V2, that is totally compatible with T-REX. You only need to do some corrections on pitch curve