Depron Heinkel HE162
25 Feb 2021 22:05 #97
by Quorneng
Replied by Quorneng on topic Depron Heinkel HE162
Managed to test the 'twisted' servo wire. It did not solve the problem but it did make an improvement probably good enough to be used.
As crash suggests digital servos may be the best answer.
I will have to see if I can find a really small digital servo.
As crash suggests digital servos may be the best answer.
I will have to see if I can find a really small digital servo.
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26 Feb 2021 11:51 #99
by Quorneng
Replied by Quorneng on topic Depron Heinkel HE162
Klippy
In the video the hesitant servo had its own long & heavier gauge wire (26 AWG rather then 32 for the short one) from the servo tester.
I think this suggests the problem is related purely to the length of the wire.
I did consider using an independent and remote long signal wire but realised that if the signal was being corrupted by some sort of wire proximity it would require its own remote earth return as well or in other words it would be a 4 wire servo - signal + return and power + return.
At this point my brain started to hurt as I suspect the proper answer will only come when exactly what is going on is identified which would require equipment I don't have.
As the results using 5 and 9 g servos showed an improvement I do wonder if in achieving the very small 3.7 g size the stray voltage filtering tolerance has been sacrificed within the servo itself.
Normally this shortcoming would not be obvious as only a 'crazy' person would try to use a 3.7 g servo on a size of plane that required a such a wire length!
I have found what is claimed to be a 3.7 g digital servo.
It may be but the case looks identical even to the same translucent blue plastic so it might just be 'digital' because the label on the case says so.
In the video the hesitant servo had its own long & heavier gauge wire (26 AWG rather then 32 for the short one) from the servo tester.
I think this suggests the problem is related purely to the length of the wire.
I did consider using an independent and remote long signal wire but realised that if the signal was being corrupted by some sort of wire proximity it would require its own remote earth return as well or in other words it would be a 4 wire servo - signal + return and power + return.
At this point my brain started to hurt as I suspect the proper answer will only come when exactly what is going on is identified which would require equipment I don't have.
As the results using 5 and 9 g servos showed an improvement I do wonder if in achieving the very small 3.7 g size the stray voltage filtering tolerance has been sacrificed within the servo itself.
Normally this shortcoming would not be obvious as only a 'crazy' person would try to use a 3.7 g servo on a size of plane that required a such a wire length!
I have found what is claimed to be a 3.7 g digital servo.
It may be but the case looks identical even to the same translucent blue plastic so it might just be 'digital' because the label on the case says so.
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26 Feb 2021 16:55 - 26 Feb 2021 17:08 #101
by Klipkopwildlife
![[badass]](/media/kunena/emoticons/bad_boys_20.gif "[badass]")
Actually, to be properly digital the signal should be a series of ones and zeros with a start and stop bit to tell the servo what number the output shaft should be at, ie, 0 for full anticlockwise, 512 for centre and 1024 for fully clockwise. Using a 16bit system the servo number could be contained in the first few bits, so you don't have to tell the servos where they're supposed to be. (not your address so stay where you are) thus getting away from the 'Latency' problems that some hot shot pilots complain of.
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic Depron Heinkel HE162
Eric, you know full well that the use of the words analogue or digital refers to the way in which the servo itself generates its own position signal to compare with the incoming mark/space signal.Eric wrote: All servos are 'digital' - because they use a mark/space ratio variation for positioning!
Actually, to be properly digital the signal should be a series of ones and zeros with a start and stop bit to tell the servo what number the output shaft should be at, ie, 0 for full anticlockwise, 512 for centre and 1024 for fully clockwise. Using a 16bit system the servo number could be contained in the first few bits, so you don't have to tell the servos where they're supposed to be. (not your address so stay where you are) thus getting away from the 'Latency' problems that some hot shot pilots complain of.
Do it now, you may never get another chance
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26 Feb 2021 23:03 #103
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic Depron Heinkel HE162
Yes, folks - stop shooting at me, and aim at the invisible smiley that got lost!
My comment was intended to be tongue-in-cheek, but as usual, it backfired.
Paul - depending on your interpretation - morse code is also digital, as it is a series of marks and spaces!
My comment was intended to be tongue-in-cheek, but as usual, it backfired.
Paul - depending on your interpretation - morse code is also digital, as it is a series of marks and spaces!
if you are calm and collected when all about you are going berserk - you've missed something important!
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27 Feb 2021 07:19 #104
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic Depron Heinkel HE162
I do love it when bits go missing, Eric, knew it was tongue in cheek, that's why I answered as I did, Paul, you can back off now!
Do it now, you may never get another chance
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