Blade 450x collective pitch setup

[RobH]

Hi all, I'm a newbie with only 6 months in the hobby so still learning lots.

I have a 450x with the hs5065mg servos fitted on cyclic. I have set the swashplate level at center stick with no problems but like a few have mentioned before my swashplate isn't level at high and low stick (this has only occurred since the hs5065 were fitted). People have said that this is no issue as the beastx will sort this out when in flight which I can understand.

My question is which side of the heli do I setup the collective range from? If I set it up 12 degrees from the right side of the heli when I check it from the left side I get 13 degrees. Alternatively if I setup 12degrees on the left I get 11degrees on the right.

This tells me that there is a 1degree difference between the front & back of the swashplate at high & low stick compared to the flat swash at half stick.

Not sure if this question has been asked before it any help or advise will be much appreciated.

thanks in advance
Rob

[tomatwalden]

Not really wanting to contradict people, but your swash should be level throughout it's range (high and low). If it's not, there is almost certainly something mechanically wrong that you should sort out. I've configured three different helis now using BeastX and I've not had this problem on any of them.

You question shouldn't really be a question at all, as there should be no difference from left, right, front or back.

I forget off the top of my head which step is used to 90 the servo horns, but that step is supposed to be for VERY MINOR corrections only. Sounds to me like your servos are significantly off mechanical 90 ??

[RobH]

Not really wanting to contradict people, but your swash should be level throughout it's range (high and low). If it's not, there is almost certainly something mechanically wrong that you should sort out. I've configured three different helis now using BeastX and I've not had this problem on any of them.

You question shouldn't really be a question at all, as there should be no difference from left, right, front or back.

I forget off the top of my head which step is used to 90 the servo horns, but that step is supposed to be for VERY MINOR corrections only. Sounds to me like your servos are significantly off mechanical 90 ??

Hi hi & thanks for your reply. All my servo horns are at 90 which I setup in menu G. I have only had this issue since fitting the hs5065mg. The original servos kept the swash level through the whole collective range. I used 3 identical servo horns that were supplied with the servo but I can see the aile & elev servo move the swash further. It almost seems like the aile & elev horns are a fraction long but I've seen lots of other 450x helis using the same servos and horns but no one complaining of the issue I'm having, my friend has exactly the same heli and servos and he has the same problem with his!

not really sure how to tackle this issue

[iceuk]

Rob, how are you measure the pitch, digital gauge or one of the older types?

[RobH]

Rob, how are you measure the pitch, digital gauge or one of the older types?

I measure the the pitch using Rc logger & I also have the old type.

[JWhitby]

How much adjustment did you have to do at step G of the setup menu?

Did you fit the the horns onto the servos at step G when they had been driven by the BeastX to their centre positions?

[iceuk]

Ill probably get slated but when i do my pitch set up using my rc logger its often is not the same both sides.
Half a degree difference and i level swash with swash leveller all through its range. The rc logger is very accurate.
Id fly it and see how it is after alll ur not a 3d guru all u want to do is hover and move heli around.

[RobH]

How much adjustment did you have to do at step G of the setup menu?

Did you fit the the horns onto the servos at step G when they had been driven by the BeastX to their centre positions?

I had had to make very minor adjustments to menu G, I fitted the horns in menu G when there's no light illuminated on the beastx (this is the true centre of the servo). After fitting all servo horns to as close to 90 as poss I selected each individual servo in menu G and set them all to a perfect 90.

Im thinking this is a servo horn issue as I'm very familiar with the beastx and it's setup (I also run beastx on my 600pro dfc with no issues).

[RobH]

Ill probably get slated but when i do my pitch set up using my rc logger its often is not the same both sides.
Half a degree difference and i level swash with swash leveller all through its range. The rc logger is very accurate.
Id fly it and see how it is after alll ur not a 3d guru all u want to do is hover and move heli around.

thanks for the reply I think I'll fly tomorrow and see how it goes, I'll start with a few circuits to check how it behaves.

[tomatwalden]

I had had to make very minor adjustments to menu G, I fitted the horns in menu G when there's no light illuminated on the beastx (this is the true centre of the servo). After fitting all servo horns to as close to 90 as poss I selected each individual servo in menu G and set them all to a perfect 90.

Im thinking this is a servo horn issue as I'm very familiar with the beastx and it's setup (I also run beastx on my 600pro dfc with no issues).

I'd be inclined to agree with you. It sounds like you've done everything right - and all things being equal, the servos should drive the swash level. As they're not, it must be something to do with the front servo going through a bell crank giving a different throw from the servo to the pitch link?

A swash moving not level isn't right ... The BeastX may compensate, but it shouldn't have to ...

[RobH]

I'd be inclined to agree with you. It sounds like you've done everything right - and all things being equal, the servos should drive the swash level. As they're not, it must be something to do with the front servo going through a bell crank giving a different throw from the servo to the pitch link?

A swash moving not level isn't right ... The BeastX may compensate, but it shouldn't have to ...

I think you've hit the nail on the head there Tom. Correct me if I'm wrong but If the servo horns are a fraction longer than the originals it would be a different ratio to the arm going through the bell crank hence giving the back of the swash a longer throw.

Think im going to need some new horns...

[dillwhacker]

Surely, it's likely it is the bellcrank that is introducing the error?
If the links to it are not all 90 degrees, then there will be a (cosine) error from the angles between the links and the bellcrank.
Anyway, I would have thought that +/- half a degree is less than the slop in all the linkages, and easily compensated by the FBL system.
I would think that the way FBL works is that the 3-axis gyro keeps the GYRO level, whatever the swash requires, so within reason, the swash setup doesn't matter...the 3 gyros do to the swash whatever is needed to keep the gyro stable.
Probably.....

[RobH]

I find it weird that no one else has noticed this problem as there are loads of 450x out there running these servos. It would be interesting to hear from a few members with the same setup to see how there swash behaves.