Author Topic: Logitech Flight System G940  (Read 1204 times)

Offline titan312

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Logitech Flight System G940
« on: October 26, 2010, 10:49:25 AM »
Has anyone tried this system?  Thoughts?

Offline JOACH1M

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Re: Logitech Flight System G940
« Reply #1 on: October 26, 2010, 11:16:35 AM »
I have it and love it, it's forcefeed back and I had it for 1 year now and works great
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Offline SIK1

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Re: Logitech Flight System G940
« Reply #2 on: October 26, 2010, 11:24:22 AM »
You might want to do a search.

I know that there are people that are not happy with the G940, and there are others that think it's great.
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Offline FLS

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Re: Logitech Flight System G940
« Reply #3 on: October 26, 2010, 11:24:33 AM »
People have strong and opposing opinions on the G940. Most agree the new firmware is crap. The throttle tends to develop issues from a cable binding but this is an easy fix if you don't mind voiding the warranty. There is a reversal bug when you change direction of a stick axis that some find annoying but it doesn't seem to be a problem for me in actual use.  I like mine for the FFB. If FFB isn't an issue I'd suggest the Warthog by Thrustmaster.

Offline Tigger29

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Re: Logitech Flight System G940
« Reply #4 on: October 26, 2010, 07:41:09 PM »
I've made a few posts on this.  I didn't feel that the new firmware was such a problem, nor do I feel the throttle repair is a big deal (they've supposedly corrected the issue in the builds now).  I took mine apart and fixed the issue which is just a matter of re-routing a wire.  While 'technically' this might void my warranty, I don't think it will be an issue, nor do I think they would even be able to tell I opened it up.

I love almost everything about the stick.  It feels good.  The quality seems to be decent.  Aside from the reversal bug, the stick is actually very precise.

There are two (ok.. three issues) that I have with the stick.  I'll list these in order from lowest to highest of an issue for me.

1> Trims.  There are no detents.  You have to look down at them to make sure they are centered.  I'm also not fond of the joystick's "self calibrating" feature which makes it do goofy things until you run it all through all fields of movement, but that's only something you have to do once each time the computer boots.

2> Customer Service.  Many people have many questions about about various issues, and Logitech refuses to give any kind of answers.  They must hire retired politicians to do their customer service.  I called them and was told they would forward my problems and they would get back to me.  They never did.  Online support resulted in me getting a "form letter" type of reply in broken English, and the issue was officially "closed" with no answer given and nothing resolved.  Their online Forums are a mess, full of people who are tired of these obvious design flaws but even more tired of Logitech's lack of support.

3> Reversal Bug.  I demonstrated it in a video at youtube HERE.  I know the numbers are hard to read, but if you switch the video to 480p and squint, you'll see what it's doing.  The bug is easy to recreate.  Pick an axis (any axis).  Throttle, toe brake, stick, trim.. it doesn't matter.  Pull up the corresponding value reported by Aces High (in the joystick settings menu).  Very slowly move that axis until the value changes.. then slowly keep moving it until it changes again.  You'll see the numbers 'jump' the same amount each time (Example... 23040, 23070, 24000, 24030, 24060... in this example it jumps "30" each change).  Now stop and slowly go the opposite direction.  You'll notice that a lot of movement happens with no change in value, then the value will make a huge jump all at once.. then if you keep continuing in that same direction, it will once again change just as before (example... 24060.. still 24060.. still 24060.. now 22000.. 21070, 21040... in this example it "jumps" over 2000 and then continues changing 30 each time).  And it will be consistent until you once again start going back the other way.  Keep in mind my 'examples' are slightly exaggerated to show my point... but not by that much.

Now for 'normal' flying in which you simply have to take off.. fly level.. and then land this isn't much of an issue.. but if you require precision then this is a huge downfall.  Zoom way in and try to plant your guns onto an enemy tank... it gets tougher than normal.

Logitech admitted that there was a problem with their potentiometer axis (everything but the stick itself which uses hall effect sensors instead of potentiometers) and added 'hysteresis' adjustments to those axes in their 5.09 software version (and firmware upgrade).  This was all fine and dandy except 1> no matter what you set the hysteresis settings to it seemed to make no difference.. and 2> it doesn't even apply to the most critical axes!

Logitech's engineers used to frequent their message boards, helping out where they can (much like how Skuzzy and company do here) and made mention of a "ground up" drivers and software package that was going to fix all of these issues and make great things happen with this stick, but they would be delayed because they wanted to update their original drivers first (from 5.08 to 5.09) to try to stop-gap repair these immediate issues because people were really starting to complain.  Several months later, their engineers BRAGGED about the new 5.09 drivers and how they have been tested thoroughly and fixed all of the issues.

Once word got out that the problems were in fact, NOT fixed... they disappeared off of the face of the earth.  Now, whenever people start demanding to talk with someone to get some kind of a resemblance of information, they get reminded by someone who seems like a bot that "the forums are for peer-to-peer assistance only", and that the staff at Logitech aren't required to say anything.. or even visit.. the message boards.  I understand that some users were 'verbally abusing' (so to speak.. er type) the engineers as things got very heated for awhile, but you know what... some of these people paid upwards of $400 for this hardware, and Logitech wasn't exactly proving the stick's value.  And while it could have been handled better, I can't really blame a lot of them.  But to just disappear and refuse to give any information or help whatsoever.. that's just ridiculous.  At least if they could verify that this was in fact a software/firmware issue, them maybe someone could make a custom firmware to correct it.. but no one has every really yet tried.

Our best hope at this point is that Logitech finally finishes the ALL NEW 6.0 software and that the reversal bug is a firmware and/or software issue (and not a hardware issue) and is also repaired with the 6.0 software, but a lot of us aren't exactly holding our breath any more.

It is a shame too because it IS indeed a great piece of hardware.. it just has this one 'bug'.  I purchased my stick knowing of this issue (and banking that a later software release would correct it all) because I found an awesome deal on it ($199 new with free shipping from Amazon).  There is no way I would have paid $300 plus knowing all of that.  Now, if the issues were NOT present, I would have GLADLY paid $350-400.

Do I regret my purchase?  Oh no.  I still use it every time I fly.  The force feedback is INCREDIBLE (even compared to older logitech and MS ff sticks), but had I paid twice that I would probably be extremely bitter.. not just moderately bitter as I am now.

Offline FLS

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Re: Logitech Flight System G940
« Reply #5 on: October 26, 2010, 09:06:33 PM »
Tigger if you trim nose down a little and always pull up to the target you shouldn't have any trouble with precision shooting.

Offline titan312

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Re: Logitech Flight System G940
« Reply #6 on: October 27, 2010, 07:54:44 AM »
Gentlemen,

Thank you, very much, for your responses.  Based on what you've said and the relatively moderate pricing, I think that I'm going to purchase this system.  The trick will be learning the rudder pedals after using my MS Prec. Pro for four years.  A month or two of anger and bitterness, I'd imagine.

<S> gentlemen.  Thanks again.

TITAN312

Offline Wagger

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Re: Logitech Flight System G940
« Reply #7 on: October 27, 2010, 08:18:09 AM »
I have one and really love it.  I have sent it back once for repair and it was replaced.  Customer service for me has been good. Good luck.

Offline JOACH1M

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Re: Logitech Flight System G940
« Reply #8 on: October 27, 2010, 08:22:52 AM »
Gentlemen,

Thank you, very much, for your responses.  Based on what you've said and the relatively moderate pricing, I think that I'm going to purchase this system.  The trick will be learning the rudder pedals after using my MS Prec. Pro for four years.  A month or two of anger and bitterness, I'd imagine.

<S> gentlemen.  Thanks again.

TITAN312
You will learn tue pedals quick I'm sure, go into offline Peabody and try em out
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Offline FLS

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Re: Logitech Flight System G940
« Reply #9 on: October 27, 2010, 10:54:54 AM »
Gentlemen,

Thank you, very much, for your responses.  Based on what you've said and the relatively moderate pricing, I think that I'm going to purchase this system.  The trick will be learning the rudder pedals after using my MS Prec. Pro for four years.  A month or two of anger and bitterness, I'd imagine.

<S> gentlemen.  Thanks again.

TITAN312

Keep one thing in mind, the firmware update ruins the trim forces. Use whatever driver you want but do not update the firmware.

Offline Tigger29

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Re: Logitech Flight System G940
« Reply #10 on: October 27, 2010, 11:10:41 AM »
Tigger if you trim nose down a little and always pull up to the target you shouldn't have any trouble with precision shooting.

Yes you are correct it does help slightly.. but the problem is not due to traveling though the 'center' portion of the stick.. the problem is switching directions no matter where the stick is at.  Pulling up to the target is always very precise but if I should have to release the stick and start pointing my nose back down or even move the stick upwards even to reduce the speed in which my nose is being pulled up (should I pull up too far, or if the target should nose down during the process) then all of that accuracy is thrown out of the window because once the movement of the stick is reversed (even a little bit... actually ESPECIALLY a little bit) then it jumps 3-4% and it overcompensates.

Don't get me wrong.. I actually DO like the stick.  I actually disagree about the firmware update... yes the FF feels different and perhaps more "linear" but I don't know.. "different" doesn't automatically mean "bad".  Even with the firmware update it's still awesome as far as FF goes.  (Likely any new stick bought today would already have the new firmware installed anyway).

Offline oboe

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Re: Logitech Flight System G940
« Reply #11 on: October 27, 2010, 11:21:09 AM »
I can't recommend it based on my experience.   I bought mine last November and have had it replaced twice, attempting to fix wild spiking in the rudder pedals and the right toe brake was either full on or full off, while the left and a gradual range of increase/decrease.  I just shipped the last one back, Logitech says they will refund my purchase price in 6-8 weeks.

I noticed the forcefeedback would 'drop out' occasionally and the stick would go completely limp.  Rebooting solved that but it wa annoying.

Still like the design of the product, has great features and everything I wanted but just never did work correctly for me.   I would give Logitech support a C- based on their response time to my problems, and the fact they never were able to solve the problem for me.  I am relieved to hear I'll be getting a refund though.

Offline Tigger29

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Re: Logitech Flight System G940
« Reply #12 on: October 27, 2010, 12:07:59 PM »
lol Oboe... I'll believe it when you get the check in the mail! LOL  I'm sure it will happen though.

I have a feeling that logitech has been giving a LOT of refunds for this stick.  It really is a shame though because it has so much potential...  That thought is really the only reason I haven't sent mine back.

I did some more testing.  Using joystick values that AH reports (joystick settings) I tested the stick and throttle, and would expect similar results for the rudder pedals, toe brakes, and mini-axes as well.  Before continuing, let me define 'notch' as the amount of stick movement before any actual changes gets reported to Aces High.  Aces high reports a 16 bit value (probably what Direct X reports) between 0 and 65535 and uses this value to determine the position of any given axis.  With the "Y" axis for example, pushing the stick all the way up would be ZERO, and pulling the stick all the way down would be 65,535.  Consumer grade (affordable) controls can not accurately measure 65,536 points of 'movement' but rather usually report a small value which is scaled to a higher value.  Take for example the four position blower motor switch on your car.  It has four 'notches': Off, Low, Medium, and High.  If that were modeled by Aces High, its values would be 0, 21845, 43690, 65535.  Granted, this is an extreme example, but think of a joystick axis as such a switch, except with many more notches and no physically stop between each 'notch'.

In the example of the G940 (at least with my calibration), there are about 200 'notches' for the trim/rotary knobs, about 112 'notches' for the throttle levers, and about 900 'notches' for the X and Y axis (which are the most precise).

We'll start with the most precise axes... X and Y. 

With Y, the value (being between 0 and 65535 or 16 bits) changes about 76 points for each 'notch' of stick movement (or about 0.12%).  If I reverse the direction the value changes 830 points before a 'notch' is reported, which is about 1.3%.  When aiming for an enemy plane or tank 400-500 yards away, that 1.3% can be quite significant.

X is very similar, with each 'notch' being 73 points (or about 0.11%), but this jumps to 804 points (or about 1.2%) upon reversal.

Now the trims.  quite a bit less precise we have the following:
Trim1 on the stick... about 348 points (0.53%) for each 'notch', jumping 1743 upon reversal (2.7%)
Trim2 on the stick... about 331 points (0.51%) for each 'notch', jumping 1655 upon reversal (2.5%)
Trim3 on the stick... about 352 points (0.53%) for each 'notch', jumping 1762 upon reversal (2.7%)
R1 Trim on the Throttle... 318 points (0.49%) for each 'notch', jumping 1592 upon reversal (2.4%)
R2 Trim on the Throttle... 321 points (0.49%) for each 'notch', jumping 1606 upon reversal (2.5%)

Now this were it gets extreme... the throttles!  These aren't especially accurate to begin with, but when the flight leader calls out "20 inches of manifold" to maintain formation, it becomes difficult to get because it will jump from.. say 17% to 23%.  I often have to adjust way past, then reverse and slowly hope I can find 20% (and if the other engine isn't the same exact value it becomes doubly difficult).

THROTTLE 1 (on the right)... about 585 points (0.89%) for each 'notch', jumping 3511 upon reversal (5.4%!!!)
THROTTLE 2 (on the left)... about 585 points (0.89%) for each 'notch', jumping only 2926 upon reversal (4.5%).

Because of the variances of the reversal bug on the throttles, it becomes difficult to accurately adjust both engines to a specific value.

Yes, it can be dealt with.. and workarounds can be developed.. and flight habits can be changed to decrease the effect of this bug.. but the simple truth is for a piece of hardware that sells for upwards of $350 (and sometimes more!) this is simply unacceptable, especially when the hardware is advertised as being a "Precision Force Feedback Joystick".  This kind of behavior may be expected from an entry level, economy stick, but not for something that is advertised for the simulation genre of gaming.

Offline RTHolmes

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Re: Logitech Flight System G940
« Reply #13 on: October 27, 2010, 01:18:33 PM »
interesting, for comparison the X52 Pro's resolutions are:

X/Y axes 1024
Z axis 512
Throttle 256
Trim pots 256


Based on what you've said and the relatively moderate pricing, I think that I'm going to purchase this system.

did you do a forum search?
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Offline titan312

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Re: Logitech Flight System G940
« Reply #14 on: October 27, 2010, 02:47:11 PM »
Actually, I did.  As someone else said, people either love it or hate it.  I think I'll buy the system and keep the receipt.....lol.