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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 09-17-2019, 05:20 PM   #1 (permalink)
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Default New 300x ele servo rod way too short

Here we go again ! How can they miss this !!
All the cyclic servo rods the same length .
It shows in manual to set the three rods same length .
The ele servo is about 5mm lower than front servos so obviously to set the servo arms up at 90 the rear rod needs to be longer or the joints fall off the rod !!

Unless you sub trim the elevator servo miles off 90 degrees it not work out as the ball joints will fall off the rods .
Also from the factory both my front left / right hand thread joints have been put on upside down .
Hope I’m not gonner have to get hold of a longer rear elevator rod my self !!
Hmm another heli off Align put to one side 😞
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Old 09-17-2019, 07:26 PM   #2 (permalink)
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Can you use the recommended length for the elevator and shorten up the pitch and aileron links ?


HW.
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Old 09-17-2019, 07:45 PM   #3 (permalink)
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You can't make the ELE rod longer?
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Old 10-03-2019, 02:11 AM   #4 (permalink)
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5mm no the links will come off the rod in flight
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Old 10-08-2019, 03:18 AM   #5 (permalink)
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I give up waiting for a response from Align !!!
I set the elevator rod approx 2mm longer than standard with the new beefed up links .
Then fitted new links also in front rods and set them the correct way up not like Align did and fit them upside down .
I just wound the front ones down then with the flight controller locked at zero to level the swash off .
The links just about bottom out then on front for it to be level and all servo arms set at 90.
Not much adjustment was needed on blade grip arms to set both blades at zero .
But the manual is wrong because it’s impossible for the three rods to be the same length when the elevator servo is sitting way lower in frames .
Also the elevator rod needs to be longer and the front rods shorter .
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Old 10-09-2019, 07:36 AM   #6 (permalink)
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I would be getting a 3 rod from another manufacturer like say Oxy 3 and see if that would work
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Old 10-24-2019, 07:28 AM   #7 (permalink)
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After making mod listed above to swash rods I can not get my swash to travel level thru the entire pitch range. I am getting a lot of back ele with negative pitch. It was doing this prior to me adjusting the linkage rods. Am I missing a setup step to remove this issue in the GRS setup? Endpoints don't appear to make any difference to the grs on the bench. Is the GRS bad or is it the geometry.

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Old 12-07-2019, 12:53 PM   #8 (permalink)
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I'm in the process of setting up my 300, and I'm at the same blockade. Anyone have a simple cure?
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Old 12-08-2019, 11:34 AM   #9 (permalink)
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I set my 300x up to the book (Beast X), did not adjust any link rods........flies perfectly. What I noticed was while sitting on the skids the swash 90* to the main shaft, but if I raised the front end up (with a bubble level on the boom), seeing level, the swash now dips from negative elevator making it "an unlevel swash". These things are mad by the thousands, this cannot be a mistake on ALIGN's part, so many are flying them including rtf without a mention. Anyway, glad I'm moving forward and tuning it for 3D. Btw, its a nice helicopter, impressive 3S power.
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Old 02-20-2020, 07:11 AM   #10 (permalink)
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Has anyone found an aftermarket or different brand link that fits?

Can't believe Align didn't notice the swash can't be levelled with 90 servo arms. the ele servo is 2.5mm lower than the Ail/pit servos, so the link should be 2.5mm longer, e.g. 20.5mm.

EDIT: I've ordered some M1.4 threaded rod to make a 20.5mm link. How annoying.

Last edited by xJoe; 02-21-2020 at 06:01 AM..
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Old 02-21-2020, 06:00 AM   #11 (permalink)
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I emailed Align support yesterday and told them the linkage rod was 2.5mm too short and that it should be 20.5mm for the elevator.

Here is the reply from Align:

Quote:
Queena Zeng - ALIGN <[email protected]>
Fri 2020-02-21 6:26 AM
Hi Joe,

Thanks for your e-mail and support.

Basically, there is no problem for the length of likage rod of servo because the length is adjustable based on pilot needs or when tracking is off while flight. Please refer to the manual as below image and try again.
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