DLG/HLG Gliders Thread - Page 4 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-27-2013, 03:13 PM   #31
takeoffeh
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Re: DLG/HLG Gliders Thread


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Originally Posted by B.Welwood View Post
I just bought Dennis' last two ATX 802's last week, prompt service and good price. Still waiting for the JR285 to arrive. Jeff, these are going in the you know what. The HK servos I ordered are for foamy slopers that will get pounded into the ground as slopers do.
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Old 11-28-2013, 09:36 AM   #32
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Re: DLG/HLG Gliders Thread

Ok that does not really explain why I do not see big difference between the servos on my test rig.

Another question, the 'better' servos have soft gears so I may need sets of gear trains, no problem what so ever. But all servos are glued in and hard to get at in these DLG so how do you easily change these broken gears if you have to do major surgery and do damage to the wing, each time to remove the servo. The tiny fuse is no better. I rather have stronger servo where I do not have to do that as often, or again am I missing easy way to do that.???

Last edited by ddruck; 11-28-2013 at 10:49 AM.
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Old 11-28-2013, 11:36 AM   #33
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Re: DLG/HLG Gliders Thread

I reached my typing limit yesterday therefor I simply became agreeable

I buy quality servos because I do get a lot of wear out of them and I don't want to be pulling them out of wings to replace gear sets. I merely listed the cheaper servos that perform reasonable. I listed the Dymond because as I mentioned earlier wing thickness limits your choices. Dymonds physically fit and will perform reasonable .

There is much more to a good servo than just what you will see on a bench, For example, some servos drift terribly in the presents of heat. Your trims constantly change as your flying sessions goes on.
Some servos have poor bearing seats so a knock might not break a gear set but rather ruin the seat the bearing or bushing set into. The output shaft will be sloshing around giving the same slop you would experience with a wore out gear train.
Other servos might center on par but the steps in trim changes are much wider. One click does nothing then two click gives you the equivalent of 3.
The deference in flap settings between thermal and cruise modes might only translate to 3-4mm at the Trailing edge and add to that the very fine resolution in the geometry of the linkage itself and you have a servo that simply doesn't perform a given task.
Have a look at how short my control horns are on a top drive flapperon installation and then imagine how much motion [or how little motion it would take to change the flapperon trim http://www.rcgroups.com/forums/thumb...lery&t=1616214
Also note how the 8mm thick servo is completely inside the core of a 10mm thick wing.
I'm no stranger to doing surgery to replace gear sets

Hope this helps
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Old 11-28-2013, 12:10 PM   #34
ddruck
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Re: DLG/HLG Gliders Thread

Thanks, that makes sense, that is what I am looking for. Even for RES planes I always get the best elevator servo I can get just to get consistent centering and trim adjustments. Rudder for me was less important, but I guess on DLG rudder has to be consistent and have good holding power through the launch. Camber changing on this size of wing gets also pretty important due to fairly minute degree changes, but linkage tightness has a lot to do with it also.
My bench test does serve important function for me. It shows bad servos before I mount them and I can pick matched pairs together with equal throw and travel for flaps or flaperons. Not always consistent with cheaper servos, or even more expensive ones, even batches are different sometimes.
Dan

Last edited by ddruck; 11-28-2013 at 12:31 PM.
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Old 12-01-2013, 06:29 PM   #35
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Re: DLG/HLG Gliders Thread

Kinda got my eyes set on buying the xg8 radio from JR. Has a large thread in the handlaunch part of the groups, and I like the way the sides are formed for a positive grip on the radio.
I think the right rear switch has to be modified and setup for a launch elevator mix, I need to read more on that.
Any radios that are built ready to go with the switches in the right place and sailplane mixes out of the box?

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Old 12-01-2013, 07:55 PM   #36
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Re: DLG/HLG Gliders Thread

Dan,

There is a considerable difference in servo centring under load. Digital servos should be much better, because they will apply full torque until they get to where they want to go, whereas analog servos apply torque that decreases rapidly as they approach the commanded position. Some are much better than others though.

Servormances does very good independent testing of servos. Not all servos have been tested, JR servos are under Graupner with different numbers, and it is in French. They test centring to 0.01 degree electronically:

http://www.aeroglide.net/2013/02/ser...-fevrier-2013/

I like the KSTs for the price too. Not as good as MKS, but at 1/3 the cost the KSTs are pretty good.

Kevin
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Old 12-02-2013, 09:35 AM   #37
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Re: DLG/HLG Gliders Thread

Thanks Kevin, that is excellent database they compiled and it looks like they are updating it as they get new tests done. Makes shopping easier, if the servo is in the database. Shows how 'optimistic' manufacturers are with the torque measure for their servos. Pretty easy to figure out, French or not.
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Old 12-02-2013, 12:41 PM   #38
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Re: DLG/HLG Gliders Thread

http://www.noerskov.eu/dlg.html

stumbled across this
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Old 12-02-2013, 04:00 PM   #39
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Re: DLG/HLG Gliders Thread

Quote:
Originally Posted by ddruck View Post
, French or not.
Dan
Not

http://www.servodatabase.com

back to topic
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Old 12-02-2013, 08:19 PM   #40
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Re: DLG/HLG Gliders Thread

The difference is this database is compiled retail data, useful.
The French one is bench tested data, big difference.


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