180 oz-in servos for 85" Yak?

180 oz-in servos for 85" Yak?
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180 oz-in servos for 85" Yak? - 3/24/2006 10:25:24 PM

JustABigKid

Posts: 244
Joined: 9/4/2003
From: Monrovia, CA, USA
Status: online

I know that Quique recommends the JR 8611 servos, but I see in the flying manual that the minimum seems to be 180 oz-in servos. I have Hitec 5945MG's on 6.0v - which are exactly 180 oz-in - which I'm planning to use for my ailerons and elevators. I have a 5955TG for my rudder. Does anyone have experience using the 5945MG's for the 85" Yak? I'm hoping they're enough to prevent flutter when doing IMAC...

I'm also thinking that I should be able to prop the engine (DA-50) to get good 3D while limiting the max speed - which should help prevent flutter...

Post #: 1

RE: 180 oz-in servos for 85" Yak? - 3/25/2006 7:54:09 AM

Rezagh

Posts: 1808
Joined: 6/10/2004
From: Rancho Santa Margarita, CA, USA
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Hi Ken,

Make sure you seal all the hinge lines except for rudder. You are using minimum torque servos required for this plane and you need to be very careful to any sign of flutter and in case of happening STOP flying until you get your servos changed. The control surfaces on this plane are quite large and at higher speed it will require lots of servo juice. Also make sure you always keep your battery fully charged to get the most out of the servos. As far as 3D goes, you'll find this plane a 3D beast and extremely manageable in low speed maneuvers. Please let us know about your experience once you got some flights on it.

Thank you,
Reza
Quique's Aircraft Support

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Post #: 2

RE: 180 oz-in servos for 85" Yak? - 4/5/2006 10:04:02 PM

dalita

Posts: 165
Joined: 12/15/2001
From: Mesa, AZ, USA
Status: online

I used 5945's on ail and elev. I don't know why, but both aileron servos quit. I now have 5955's to install. Dale

(in reply to JustABigKid)

Post #: 3

RE: 180 oz-in servos for 85" Yak? - 4/5/2006 10:08:36 PM

Rezagh

Posts: 1808
Joined: 6/10/2004
From: Rancho Santa Margarita, CA, USA
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Hi Dale,

Well it's not unexpected! See when servos work really hard to give you max juice, they do sometimes burn as 180 ozin servo is the minimum requirement for this plane, Servos under lots of load sometimes just can't take it anymore. That's why it's recommended to use higher torque servos like 5955 or 8611. 5955 are going to be fine and you won't see that problem any more.
Thank you for sharing your experience with us.

Good Luck,
Reza
Quique's Aircraft Support

< Message edited by Rezagh -- 4/5/2006 10:11:13 PM >

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Post #: 4

RE: 180 oz-in servos for 85" Yak? - 4/5/2006 11:26:23 PM

JustABigKid

Posts: 244
Joined: 9/4/2003
From: Monrovia, CA, USA
Status: online

OK, I'm convinced. I'm returning the 5945's back to Chief Aircraft, and getting 8611A's instead. One less thing to worry about...

(in reply to JustABigKid)

Post #: 5

RE: 180 oz-in servos for 85" Yak? - 4/7/2006 5:08:52 PM

cwoodstx

Posts: 73
Joined: 1/9/2002
From: Plano, TX, USA
Status: offline

I have been flying my 85" for about 6 months now and I have 5945's on aileron and elevator, and a 5955 on the rudder. I have had no problems at all with these servos. I do mainly 3D so they get a good workout. I run 6V unregulated and I notice that when the voltage gets a little low after several flights that the 5955 on the rudder will jitter a little. I have seen this on another 5955. I just charge more often at the field to compensate. They are great servo but in my experience they like the higher voltage. I might switch to LION with a 6 volt regulator.

BTW, I have built and flown many 28% size planes and this one is the best so far. Its the only plane I fly now, I sold the others. I even built a backup.

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Post #: 6

RE: 180 oz-in servos for 85" Yak? - 4/7/2006 5:12:40 PM

Rezagh

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cwoodstx,

Thank you for sharing your experience with us. I personally like the idea of having constant 6v to the servos by using li-io and regulator. Thanks for your comment on the plane also.

Reza
Quique's Aircraft Support

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Post #: 7

RE: 180 oz-in servos for 85" Yak? - 4/7/2006 5:50:01 PM

shakes268

Posts: 1281
Joined: 1/11/2005
From: Brentwood, TN, USA
Status: offline

quote:

ORIGINAL: cwoodstx

I have been flying my 85" for about 6 months now and I have 5945's on aileron and elevator, and a 5955 on the rudder. I have had no problems at all with these servos. I do mainly 3D so they get a good workout. I run 6V unregulated and I notice that when the voltage gets a little low after several flights that the 5955 on the rudder will jitter a little. I have seen this on another 5955. I just charge more often at the field to compensate. They are great servo but in my experience they like the higher voltage. I might switch to LION with a 6 volt regulator.

BTW, I have built and flown many 28% size planes and this one is the best so far. Its the only plane I fly now, I sold the others. I even built a backup.

I have 8611a's all around except for a 5955 on the rudder. I use Fromeco LI-IO batteries regulated to 6 volts and I've never seen a jitter even when the packs were close to the recharge voltage. They seem to draw a little more power than the 8611a's as well. Great servo though - very very happy with my setup.

(in reply to cwoodstx)

Post #: 8

RE: 180 oz-in servos for 85" Yak? - 4/17/2006 7:46:39 PM

blkbird68

Posts: 633
Joined: 4/4/2002
From: Henderson, KY, USA
Status: offline

I have a 5955 on the rudder and 94358's on everything else. The only servo showing any sign of a problem is the 5955... It doesn't center worth a crap.

I use an 8cell battery pack with regs. set to 6.2V under a 5 amp load.

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Post #: 9

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 3:50:45 AM

Nogyro

Posts: 1981
Joined: 11/30/2001
From: Puryear, TN, USA
Status: offline

quote:

ORIGINAL: Rezagh

Hi Ken,

Make sure you seal all the hinge lines except for rudder.
Reza
Quique's Aircraft Support

Why wouldn't you want to seal the rudder hinge line? First I've ever heard of this.....Is this just on QQ planes, or all GS stuff??

Thanks,

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Frank

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Post #: 10

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 4:21:57 AM

Rezagh

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Hello Nogyro,

Rudder is not as important and the gap is not that bad for the position that rudder is. Normally you don't have to seal the rudder, however if you want why not. Other surfaces must be sealed. I can't speak to other companies recommendation on their airplanes but I have never personally never sealed rudder on any planes that I've had. Quique also is not concern about sealing rudder.

Thank you,
Reza
Quique's Aircraft Support

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Post #: 11

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 4:26:39 AM

blkbird68

Posts: 633
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From: Henderson, KY, USA
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NO sealed surfaces here.....and no problems...never have sealed the surfaces on any size plane.

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Post #: 12

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 9:53:27 AM

Aussie_Knife_Edge

Posts: 260
Joined: 8/21/2005
From: Sydney, AUSTRALIA
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I've never sealed the control surfaces on a model either but I suppose that doesn't make it right not to. Would be interesting to see the difference before & after sealing. My thinking is that if QuiQue says to do it it should be done.. Thinking logically, non sealed surfaces must have an awful lot of turbulance around them. Not sure why you wouldn't do the rudder as in knife edge it acts like an elevator.

How should the surfaces be sealed anyway? The instructions are pretty vaigue in this area.. Some pic's would be a nice addition to the instructions.

Cheers
Jason.

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Post #: 13

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 12:38:17 PM

Nogyro

Posts: 1981
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From: Puryear, TN, USA
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I used to have a Giant Stinger/G62 combo and I flew it originally without sealing the hinge lines. Several months later I sealed them. I could really feel the difference on the ailerons, not much on the elevator. Rudder really didn't do much either way.

I'm sure it all depends on the size of gap you have between the control surfaces.........I do it now more for flutter prevention than anything.

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Post #: 14

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 8:12:16 PM

Vic3D

Posts: 358
Joined: 6/23/2004
From: Caguas, PUERTO RICO (USA)
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I used only one 5625 per aileron on a 87" TOC Yak that I had and never had any problems. They were enough for fast rolling and never fluttered. They have 130 oz/in of torque. So why 180 oz.?

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Post #: 15

RE: 180 oz-in servos for 85" Yak? - 4/19/2006 10:59:59 PM

Rezagh

Posts: 1808
Joined: 6/10/2004
From: Rancho Santa Margarita, CA, USA
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Sealed control surfaces not only reduce the chance of flutter but also will make the control surface responce a lot crisper and better. Think about the airflow and the gap that is not sealed! Sealed hinge lines would give you better more precise response on the control surface. Now Rudder can be left unsealed and still most pilots like me don't feel the difference but if you think you'd like to seal them, why not!

Vic3D,

I can't speak about other companies planes but if anyone uses anything less than 180 oz on QQ-Yak 85" would seriously endanger the life of his plane. Lots of reasons including the surface area and condition of flying. Some people are lucky enough to fly in calm days with little wind and some fly their planes in 15-30 MPH wind and beleive me they take the plane to its limits too. The requirement is given such that you can fly at any condition and minimum which is not even strongly recommended is 180oz.

Thank you for all your questions,
Reza
Quique's Aircraft Support

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Quique's Aircraft Company

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