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The following is what I've been told:
The radio system refreshes the servo positions in sequence. Not positive about JR but I heard futaba used to do all odds then all even channels?
Example
(1-3-5-7-9-2-4-6-8) (1-3-5-7-9-2-4-6-8) (1-3-5-7-9-2-4-6-8)
So if you had for example one servo on 1 and the other on 6 you've got a good bit of lag between those. Having one or both reversed can make the situation worse. Keep in mind this was most noticed in the 9c etc which already had 140ms of latency. The elevator matching was ugly sometimes.
Both manufacturers now have servo grouping which I believe assigns similar servos to adjacent positions in the refresh sequence so Ailerons will be 1-2-3-4 etc. They might even update simultaneously not positive. Ideally the problem should be all fixed now, or at least as much as the radio manufacturers can do.
Having said all that I did not notice any problems setting up my Extra. I use a 9303 and 7955's and I took a LOT of time to make sure it was right. Hours of matching deflections and I did not find any lagging.
Things I'd suggest trying:
-try a different power system on the bench and see if you can remove the issue. Those cells may not be putting out as much power as you think
-check your extensions. Are they heavy gauge? What about those connectors?
-if you plug two servos directly into the receiver with no extensions or linkages is it still lagging? |
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Thanks for the information. The Latency I am unsure of other than the Visual i get from the elvator halve. I will check through the extentions again to make sure all is well. but on a bench with no control surface, I am unsure if I will be able to see it as the elevator half is much larger than a control horn.
I havent tried putting two servos directly into the receiver with no extentions. I will bring an extra servo with me today. My first test is going to be swapping the servos to versa as appose to visa if you know what I mean. If the half that is lagging right now is still lagging then I know that is is either the servo, the wire or the receiver. If it is the other one, then I know it is receiver based. I will then test the voltage and amperage on the channel and see if they are significantly diffrent from the other half
The battery was brand new sitting in the bag. I purchased the plane second hand, and he had a dual setup with a batshare on 6v nimh. I dont like using other peoples batterys and I didnt have two packs of matching mah to put on it. I took the dual setup out for the time being. I know nimh can have voltage drops issues due to exessive amerage draws, but jsut the elevator half and not the other surfaces?
Ill keep ya posted!
Thanks again!