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11-12-2012 04:29 AM  7 years ago
Santiago P

rrProfessor

Dayton

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Let me try:

You get home tired from work and your wife asks you how your day went.
You respond fine, had a busy day. <---low resolution

Then you ask, how did her's went.
And she begins telling you about the mess she had in the kitchen because the kids spilled their breakfast, and that lead to an argument with the school busdriver who keep blowing by the bus stop, so she had to drive the kids to school, and then had to go get groceries were she found a poor man selling foodstamps to pay for his vices; then bumped into her lost cousing Georgia who owed her money from the last time both went out in to a shopping spree. That mad her so got upset and while driving went too fast and got speeding one street short from home. Then she got a call from her parents saying they are on their way to visit then for the upcomming 3 day weekend. <----high resolution

You turn around and drive straight for the bar to have a few beers where she kept nagging you with text messages...<---bad resolution

S
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11-12-2012 02:50 PM  7 years ago
cudaboy_71

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sacramento, ca, u.s.

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definitely need to adjust the vodka gain on that one MPV.if it ain't broke, break it.
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11-12-2012 05:59 PM  7 years ago
Santiago P

rrProfessor

Dayton

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agree on dialing up the gain...

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11-12-2012 06:12 PM  7 years ago
BobOD

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New York- USA

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A double is low resolution. A triple is even lower.Team POP Secret
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11-22-2012 08:31 AM  7 years ago
Zbawer

rrApprentice

Singapore

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I was wondering if there is any point after which too much servo resolution becomes an overkill (in a FBL setup) and start generating some adverse effects ... if so what kind of adverse effects ?

My guess is that when you move the ball link closer on the servo output arm, you increase resolution, you increase torque, you minimize free play, BUT you also lose in speed.
I guess this would also require to pump up the FBL gyro gains as well (which is a good thing, higher gain = more locked-in).

But I know FBL units need fast reaction from the cyclic servo to operate to their max performances.

So without considering the point where linkages start binding on the servo spline, is there any other threshold (in terms of large servo movements / slower reactoion) after which the FBL unit will no longer be able to keep up with the stabilization ?

I would assume the answer to my question would be the same regardless of what bird / FBL unit is considered, but for the sake of giving more details :
I have a T600N equipped with a Tarot ZYX. Servos are BLS 451 on 6V
I was using the second hole (starting from the center) on standard futaba servo arms, but the other night I tried setting thing up using the first / closest hole which is at about 7mm from the servo output center !
I pumped up my AFRs and still manage to get -/+13 collective and 10 on cyclic.
But when I combined full collective and cyclic to move the servos to their extremes, I think I easily get over 140 degres rotation in total.
Have anyone tried that before and experienced weird behaviour form their FBL ?
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11-22-2012 01:00 PM  7 years ago
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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That totally depends on the unit. Some units have a larger range of acceptable geometry and such. They all have a "sweet spot" they like to be in though.....RonTeam MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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11-22-2012 02:14 PM  7 years ago
BobOD

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New York- USA

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You're right about the speed versus torque opposition. But, let me dispell a myth.
I guess this would also require to pump up the FBL gyro gains as well (which is a good thing, higher gain = more locked-in).
Higher gain does not really = more locked in. If you change the geometry so more servo travel is needed for a given response, then the gain would need to be increased accordingly. The gain is simply telling the gyro how much it's going to have to move the servo to get a given response. Higher gain may = more locked in for one mechanical setup, but 2 different mechanical setups will require different gains and the one with the higher gain may not be the most locked in. You need to consider the speed/torque to determine that.
The faster and more accurate (higher #bits) the gyro is, the less it will care about resolution....so you can go with more speed and lower gains and still be locked in.

BTW, there is one other issue with the mechanics. When you get the links at steep angles, it can affect the gyro. Typically, balls closer in increase this.
Team POP Secret
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11-22-2012 04:28 PM  7 years ago
cudaboy_71

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sacramento, ca, u.s.

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I was wondering if there is any point after which too much servo resolution becomes an overkill (in a FBL setup) and start generating some adverse effects ... if so what kind of adverse effects ?
you can't add resolution that is not there. the best you can ever do is get the native resolution of the servo. once you achieve that and you continue adjusting in the same direction all you end up doing is limiting the range of throw of the system. but, you still only have the native servo resolution.
if it ain't broke, break it.
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11-24-2012 12:41 PM  7 years ago
Zbawer

rrApprentice

Singapore

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Today's flying session was a success!
Could increase the cyclic gains on the ZYX from 45 to 60.
I also saved a good 15-20% on battery consumption.
It did felt more locked-in in flight as well, but maybe this is more due to the fact I started using the 600 EFL main shaft which lowers the rotor gead by 1cm...
All in all I'm happy I went one hole in on servo arms
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