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Align 450 Bent rotor head pin


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borillion_star
Hover Master
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Joined: 27 May 2012
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Location: San Jose, CA

PostPosted: Tue Apr 16, 2013 1:00 am
PostPost subject: Align 450 Bent rotor head pin
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I guys looking over a heli I have I see that one of the metal bars from the servo to control tilt is bent.



Is this bad enough that its going to have to be replaced? I was given this heli and it was previously flown. I figure with having to set it up with the receiver I can just compensate for it when configure the receiver to work with the servo's but have limited range of motion in that direction?

anyone have any recommendations?
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admiral
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Joined: 20 Mar 2009
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Location: Brisbane, Australia

PostPosted: Tue Apr 16, 2013 2:36 am
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Hi Borillion_star,

Well yes and no, any bend like this will effect the head set up so it needs to be repaired or replaced, in this case it will effect the swash plate level an needs to be repaired the best tools would probably be two pair of pliers.

Further to this seeing that you are installing a new receiver, start from scratch strip the head off, straighten the link then re-level the swash plate then re-do the blade tracking. Personally I would check every screw in the helicopter is thread locked and tight, I never trust anybody else's build.
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jathanjr
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Joined: 21 Jan 2013
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Location: League City, Texas

PostPosted: Tue Apr 16, 2013 3:25 am
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hi borillion_star,
honestly i would replace your bent linkage! they a super cheap, so why not
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Burgess
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Joined: 27 Mar 2012
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PostPosted: Tue Apr 16, 2013 6:42 am
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Hi borillion_star

Good advice from Keith.

It looks like a Hobbyking 450V2. Those servo link rods are very soft, and easy to straighten out. The problem is, if that rod is bent, are the feathering shaft and main shaft OK. Remove the main rotor blades insert a hex driver into the screw in one blade holder and rotate the driver. If ether blade holder waggles about, extract both the feathering shaft and main shaft. Roll the main shaft on glass table or the like to check. Links and shafts are relatively inexpensive from Hobbyking, Align components will also fit, they do stainless steel link rod sets.


Burgess
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admiral
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Joined: 20 Mar 2009
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Location: Brisbane, Australia

PostPosted: Tue Apr 16, 2013 9:57 am
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jathanjr wrote:
honestly i would replace your bent linkage! they a super cheap, so why not


Hi Jathanjr,

It wasn't about saving money, a slight bend like that is easy to straighten and the link will return to the same length, to replace the link properly you need to ensure that the new link is exactly the same length as the remaining two links, and that would be more difficult for a newb than staightning the old one.
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Burgess
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PostPosted: Tue Apr 16, 2013 10:09 pm
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Hi borillion_sta

you'll need to download an Align T-rex 450 SEV2 pdf manual and obtain a swashplate levelling tool.

Keith,

If you look at the upper frame, you can see that the servos are at 3 different heights relative to the main drive gear. The servo rod-links for HK450V2, from eye to eye centres are approximately the same as the Align 450SEV2 and the measurements given in the manual are:
D 31.3mm, (this is the rod one we can see) pitch or aileron
O 45.0mm, aileron or pitch
N 40.3mm, elevator

The problem is HK link rods are soft mild steel, the metal on the outer radius has now been stretched, and bending it straight then stretches the metal on the inner radius. So the rod might be straitened but it will be weaker.

HK450V2 links only UKP £1.23, Align Stainless steel link set far better.

borillion_sta can rebuild, we have the know how...and most of us have the time too. 'Wink'

Burgess
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borillion_star
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Joined: 27 May 2012
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Location: San Jose, CA

PostPosted: Wed Apr 17, 2013 2:15 am
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Gonna bend it back for now, and purchase the linkage set like here ?

http://www.amazon.com/Align-450-Stainless-Steel-Linkage/dp/B001HSC2GO/

Do the markings SE/CF matter much?
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Burgess
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PostPosted: Wed Apr 17, 2013 3:57 am
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Hi borillion_star

The rod diameters vary, better to get a complete set of links with rods and eyes.

If your lookin to use Amazon.com, do search with this Stainless Steel Linkage Rod Set: 450SE/CF

Do a Google search with this ALIGN HS1119-1 STAINLESS STEEL LINKAGE ROD SET
lots of places state side.

STORM 430 Parts will fit.
Storm-Parts-STP-008
http://www.helipal.com/stp-008-linkage-rods.html

450SEV2-136 Ball Linkage Set
http://www.helipal.com/450sev2-136-ball-linkage-set.html

Two shops on ebay
gogo.rc
Ball Linkage Rod Bag For Align T-rex 450 SE & V2 (LRHS1119)

chunqianguan
Ball Linkage Rod Bag for Trex 450 V2

Burgess
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borillion_star
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PostPosted: Thu Apr 25, 2013 1:13 am
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The rod set finally came in. Whats the right way to rebuild this, can I just pop off all the eyelets from the servo's and put in the corresponding ones?

Do I need to replace the entire set or just these?
D 31.3mm, (this is the rod one we can see) pitch or aileron
O 45.0mm, aileron or pitch
N 40.3mm, elevator
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borillion_star
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PostPosted: Fri Apr 26, 2013 2:45 am
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Ok so I realized I need special tools for this Razz I ordered a 15 piece toolkit, I do need gauges though, one for the blade pitch and what was the other?
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Burgess
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PostPosted: Fri Apr 26, 2013 3:43 am
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Pitch gauges aren't expensive, I use two for balance and convenience,
you could make your own, see ‘Need a pitch-gauge' in Tip and Tricks section.

Alloy three-leg swashplate levelling tool, avoid those cheep little double bubble levelling things, the bubble size never match the lines.

Small digital scales for weighing blades,

Blade balancing equipment.

Short pile towel for building on

Sware box for those odd times when very small parts go out of focus on there way to the floor and apparently disappear. The manufactures have somehow develop auto camouflage for very small components. There's an unwritten law among micro faster manufactures, to manufacture the hex socket in their machine screws slightly different sizes to each other. I have four or five 1.5mm hex wrenched, and it's like the krypton factor picking up the correct one first time.


Burgess
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