RE: Aviation Models 33% Yak Build Thread

RE: Aviation Models 33% Yak Build Thread
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RE: Aviation Models 33% Yak Build Thread - 1/9/2008 6:53:06 PM

gapple12

Posts: 316
Joined: 1/20/2006
From: San Antonio, TX, USA
Status: offline

Well, my 8711 has a little wag in it. Not sure what range of throttle, but the wag was real bad at first, so I tried an SWB 4inch offset servo arm and it fixed a lot of it. I read somewhere that people are putting fuel tubing on the trailing edge to fix it. Maybe someone could log in here and explain that????? I want to fix it.....

Drew

(in reply to Richard D Bahmann aka/Wrongway)

Post #: 2026

RE: Aviation Models 33% Yak Build Thread - 1/9/2008 9:18:40 PM

larshkj

Posts: 128
Joined: 3/18/2003
From: Oslo, NORWAY
Status: offline

Richard:
I don't get tailwags, but a friend of mine got tailwags util we tightened the pull pull wires. By eye measurement, this plane actually seems to have a larger rudder than my Aeroworks 100cc Yak-54.
I get blowback on the rudder when doing knife edge passes. And the rudder feels kind of mushy. For hovering and rolling harriers it seems OK. But I'm no expert 3D pilot... far from it

This is a really good 3D practice plane though!
I think a 8711 will do the trick. I'm going to put the 5955 servo on my AW Yak, as it too needs more power on the rudder. It will have two 5955 on the rudder then.

Lars

(in reply to Richard D Bahmann aka/Wrongway)

Post #: 2027

RE: Aviation Models 33% Yak Build Thread - 1/9/2008 11:37:54 PM

Richard D Bahmann aka/Wrongway

Posts: 1993
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: online

Thanks Lars!!

_____________________________

Gonna kick the tire and light up my
Torch...Gone Flying...WrongWay

(in reply to larshkj)

Post #: 2028

RE: Aviation Models 33% Yak Build Thread - 1/10/2008 1:17:46 AM

diamondave

Posts: 1570
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline

i was planning to use 5645's all around and a 5955 on the rudder, i thought that was good enough until you guys are saying maybe not? anybody else think the 5955 isnt enough?? i did send in the reciever to be checked out, will have new batts and switches, all that jazz....

my name is on the list for a orange one

...may not be till feb they say now though

.....but i just got my 58" extraE from ef, looks awesome, will get that together soon, will be ready for this one by then

(in reply to Richard D Bahmann aka/Wrongway)

Post #: 2029

RE: Aviation Models 33% Yak Build Thread - 1/10/2008 1:52:25 AM

P-Diddy

Posts: 641
Joined: 12/12/2005
From: Eugene, OR, USA
Status: offline

TAIL WAG!!!

I completely forgot about that. I had that exact same problem when I first flew this plane!! It wagged above about 1/2 throttle and during knife edge it would not deflect enough to sustain the knife. For slow 3D, it was fine, however. I thought initially that my servo had gone bad, (5985MG) since the crash that consumed my previous Yak, (Lanier 87"

. I bought a 5955TG and then found that it was only slightly better. I moved the links to the inner holes on the stock metal servo arm and that solved the problem.

-Pat

_____________________________

Currently:Aviation/SD Yak 54 33%(3W70),UltraRC GilesG202(BCMA 40cc),T-Rex600N(O.S. 50 Hyper), T-Rex 450SA (stock!)

(in reply to diamondave)

Post #: 2030

RE: Aviation Models 33% Yak Build Thread - 1/10/2008 11:46:40 AM

diamondave

Posts: 1570
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline

seems to me tail wag would be the sign of flutter, not a servo with not enough torque, maybe to big of a gap or not sealed, or not tight wires, i can understand blow back with a week servo, but a 5955 should be more than enough to prevent tail wag during flight? just my thoughts, ive been know to be wrong on occasion

, the 8711 sounds good either way

(in reply to P-Diddy)

Post #: 2031

RE: Aviation Models 33% Yak Build Thread - 1/10/2008 3:24:44 PM

gapple12

Posts: 316
Joined: 1/20/2006
From: San Antonio, TX, USA
Status: offline

Well, worked on my Yak all last night getting the CF wing tube to fit. I ended up sanding the inside of the tube with a closet rod from my house. Worked great, just time consuming. I used the sticky back 220 grit sand paper and stuck some foam under it so the paper could flex on the rod and not bind in the tube. Then I reamed out the tubes back and fourth checking the fit every so often. I used alcohol and clean rags to clean the tubes out after every couple of passes threw the tubes. CF rod fits perfect and dropped some good weight. Tonights project is to install the new CF landing gear.

Now my question for you guys is will I notice a big difference with dropping 12oz out of this plane? Cant wait to fly this weekend.

< Message edited by gapple12 -- 1/10/2008 3:25:32 PM >

(in reply to diamondave)

Post #: 2032

RE: Aviation Models 33% Yak Build Thread - 1/11/2008 6:27:34 AM

P-Diddy

Posts: 641
Joined: 12/12/2005
From: Eugene, OR, USA
Status: offline

diamondave,

This was the first time I had experienced such a thing. I think if I had gone a little faster, it may have become a flutter, but it could only move so fast with the rudder servo working against it. The rudder wires were tight, and I made them very tight to see if that would help. It didn't. The problem was likely not the servo at all but instead the leverage I had put on the servo with the rudder linkage set-up and the linkage being so far from the center of the servo arm. With enough leverage, it doesn't matter how strong your servo is. In this case, it was a big rudder set up incorrectly, and it had enough mechanical leverage on the servo that the servo became overpowered by the air moving over the rudder. The linkage was far out on the servo arm and far in on the rudder control horns... not a very good set-up at all...

_____________________________

Currently:Aviation/SD Yak 54 33%(3W70),UltraRC GilesG202(BCMA 40cc),T-Rex600N(O.S. 50 Hyper), T-Rex 450SA (stock!)

(in reply to gapple12)

Post #: 2033

RE: Aviation Models 33% Yak Build Thread - 1/12/2008 3:07:22 PM

diamondave

Posts: 1570
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline

ahhh, so if set up correctly, does the 5955 have enough? just curious, it will be a while before i get mine(out of stock

), but wondering if i should get the 8711 instead, not much more money so no big deal if its the way to go, i do run 6volts too, have to check how much diff there is between the 2, i am not familar with jr numbers, will look into it

(in reply to P-Diddy)

Post #: 2034

RE: Aviation Models 33% Yak Build Thread - 1/12/2008 9:07:38 PM

P-Diddy

Posts: 641
Joined: 12/12/2005
From: Eugene, OR, USA
Status: offline

5955 will work if set up correctly, yes, it's what I am currently using. Of course, if you can afford the stronger servo, it's a no brainer... =)

_____________________________

Currently:Aviation/SD Yak 54 33%(3W70),UltraRC GilesG202(BCMA 40cc),T-Rex600N(O.S. 50 Hyper), T-Rex 450SA (stock!)

(in reply to diamondave)

Post #: 2035

RE: Aviation Models 33% Yak Build Thread - 1/12/2008 9:49:29 PM

larshkj

Posts: 128
Joined: 3/18/2003
From: Oslo, NORWAY
Status: offline

quote:

ORIGINAL: diamondave

ahhh, so if set up correctly, does the 5955 have enough? just curious, it will be a while before i get mine(out of stock ), but wondering if i should get the 8711 instead, not much more money so no big deal if its the way to go, i do run 6volts too, have to check how much diff there is between the 2, i am not familar with jr numbers, will look into it

Diamondave.

Take a look here:
http://troybuiltmodels.com/servo_testing.htm

Lars

< Message edited by larshkj -- 1/12/2008 9:50:02 PM >

(in reply to diamondave)

Post #: 2036

RE: Aviation Models 33% Yak Build Thread - 1/13/2008 3:57:07 PM

diamondave

Posts: 1570
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline

interesting reading, according to them the 5955 should be enough for 33%, but then the chart suggests 8711, and heat was the problem so the 8711 should help there to cause it jr says it has a heat sink now, so for 20-30 bucks diff i may just get the 8711 to be safe for sure...just will get one less case of beer that week, haha

(in reply to larshkj)

Post #: 2037

RE: Aviation Models 33% Yak Build Thread - 1/21/2008 9:09:07 PM

larshkj

Posts: 128
Joined: 3/18/2003
From: Oslo, NORWAY
Status: offline

quote:

ORIGINAL: diamondave

anybody try the vess yet?....i am about to call and put my name on for the next batch of orange planes do in this month

I finally got the chance to fly this sunday. The weather wasn't ideal, pretty strong crosswind and turbulence over the landing strip.

My 3W80Xi turned the Vess 26B at 6100 rpm after a 10 minute flight. The power was great. It hovered right below 50% throttle (I've even made a throttle curve that lowers the throttle around center stick)
Plenty power for my SD-Models 33% Yak-54. I can only imagine that plane with a DA-85... Man, that would be awesome! (Donnie, you're a lucky man

)
My engine is fairly new, and it isn't tuned for maximum performance. I guess I can squeeze another 100-300 rpm out of it after a few more gallons.

On the negative side, the prop was VERY noisy. Much louder than the Biela 23x10 3-blade I've used this far. It sounded like the prop rip, but at 6100 rpm, I really don't think so.

The Vess prop is to this date the most perfectly balanced prop I've ever bought. It was in PERFECT balance out of the wrapping! Really impressive. The finish is really good too.

Lars

< Message edited by larshkj -- 1/22/2008 2:51:21 PM >

(in reply to diamondave)