Yak 54 .40-.50 ARF need help with pull-pull elevator setup  
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Yak 54 .40-.50 ARF need help with pull-pull elevator setup - 8/4/2005 3:01:15 AM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		Hey everyone, I just started building my new Ultra-RC yak 54 .40-.50 size. This is the first one I found in this size range. It is an awesome fiberglass fuselage. Its the first ARF i've had that needed NO HEAT GUN or IRON work at all on the covering, what little there is anyways. The landing gear are very strong and Nice Carbon Fiber, not sure if its real, but good enough to fool someone who knows probablly. The paint on the fiberglass( or gel coat ) is excellent. I've seen a few other post on this plane, some good some bad, but I am truly amazed at what you get for $159 bucks! Here's some pictures. I want this thread to be a QA on this plane and also on some setup changes I'm doing. If anyone knows alot about rigging up pull-pull stuff with split elevators, SPEAK UP. I'd like ot go with that instead of the split pushrod way they show. It already has a good pull-pull system on the Rudder, so I want to go all out but need some advice so as to keep the split elevator pull-pull as light or !LIGHTER! than the split pushrod stuff.

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 11:30:19 AM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		I'll be more then happy to help you with this thread. I've got hundreds of flights on mine now. The people that have been crying and whining about the plane just either don't know how to fly or think it's going to be super light 3D plane. It's not ... it's a scale plane that will outfly circles around anything in it's class.

Everything I used was stock. You'll get a TON of throw from the split elevators, don't worry about putting pull pull on them.

One important tip about the elevator. Low rate 1/4", High rate 3/4". When you find a good low rate then you can max out your high rate. This is just so you have 2 safe buffer zones. You find the best low rate when you do straight and level and pull elevator with no snaps.

I've subscribed to this post so if you need anything just ask.

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 3:34:04 PM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		Thanks alot, If I use the dual pushrod setup, Id like to go with a carbon rod system just to eliminate wood in the control linkage because I've had a few bad experiences. Also, what motor are you using on yours? I put on a thunder tiger .61 pro and that helped with the balance issue. Also, did you set the wings incidence with a meter, or did you just predrill the dimples on the fuselage side and go with that? My estimated wing loading is going to end up around 28 oz., and I already knew before I bought it that it wasnt a 3D plane, and I agree that most of the whiners do not understand this part. What servos did you use in the ailerons? Im going with 3004's, but rudder and elevator are hitec ultra torque metal gear units, I think 5645's, about 144 oz of torque, and I know thats overkill, but they were sitting there and I didnt have any other high torque servos so hey! The throttle is a hitec HS-81 mini servo. Have you ever deadsticked it at all. If so, Does It do fine if you keep the speed up? And i'm assuming takeoffs need to keep the speed up before pulling vertical to make sure the wings are doing a good job first. Hey, post some pics of your yak on here if you can, Thanks again, JOHN

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 3:39:26 PM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		Just a thought, but if you noticed I put this thread under Sport Flying, Not 3D flying like everyone else, as I knew what I was buying when I bought it.!!! Smart thinkin eh?

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 4:15:36 PM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		Thanks alot, If I use the dual pushrod setup, Id like to go with a carbon rod system just to eliminate wood in the control linkage because I've had a few bad experiences. Also, what motor are you using on yours?

Saito .72

I put on a thunder tiger .61 pro and that helped with the balance issue. Also, did you set the wings incidence with a meter, or did you just predrill the dimples on the fuselage side and go with that?

I set the wings with the anti rotation pins, they are true. These are not just dimples ... whether you may already know that.

My estimated wing loading is going to end up around 28 oz., and I already knew before I bought it that it wasnt a 3D plane, and I agree that most of the whiners do not understand this part. What servos did you use in the ailerons?

I've got Hitec 635's all the way around and that's all you'll need. 5645's are not needed even close ... be careful with them.

Im going with 3004's, but rudder and elevator are hitec ultra torque metal gear units, I think 5645's, about 144 oz of torque, and I know thats overkill, but they were sitting there and I didnt have any other high torque servos so hey! The throttle is a hitec HS-81 mini servo. Have you ever deadsticked it at all. If so, Does It do fine if you keep the speed up?

If it deadsticks just find it's best glide speed and no hard turns. But I've deadsticked mine many times. Notta problem.

And i'm assuming takeoffs need to keep the speed up before pulling vertical to make sure the wings are doing a good job first. Hey, post some pics of your yak on here if you can, Thanks again, JOHN

Just a thought, but if you noticed I put this thread under Sport Flying, Not 3D flying like everyone else, as I knew what I was buying when I bought it.!!! Smart thinkin eh?

Yes, everyone thinks because it's a Yak it falls into 3D by default, thus the whiners. Why don't we see Great Planes Extra 300 in the 3D forums? Or even 33% Pitts Special? HA!

< Message edited by STLPilot -- 8/4/2005 4:16:01 PM >

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 4:20:53 PM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		My UltraRC Yak-54

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 5:46:11 PM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		My fuselage didn't have the holes drilled for the pins, so I was wondering if I drilled through the dimples wether the incidence would be good or if I would have to adjust the holes a little to bring it in check. I've heard other people say theirs were already drilled, but mine weren't. good choice for a motor. I was thinking about leaving the canopy floor out, and I thought it would make it look like a bigger 33% plane or so, because they never put a canopy floor in them. What do you mean by be careful with the 5645's? too much servo shouldn't hurt anything as long as there isn't any binding right?

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 7:34:04 PM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		My fuselage didn't have the holes drilled for the pins, so I was wondering if I drilled through the dimples wether the incidence would be good or if I would have to adjust the holes a little to bring it in check. I've heard other people say theirs were already drilled.

They are not drilled, you need to drill them. These dimples are for anti rotation pins which you can see in the photos. You use the copper tubing and glue the copper tubing into the wings.

I was thinking about leaving the canopy floor out, and I thought it would make it look like a bigger 33% plane or so, because they never put a canopy floor in them.

It's your plane, do what makes you happy. It's nice to be able to look inside it to make sure things are nice and tight. I took mine out after 3rd flight.

What do you mean by be careful with the 5645's? too much servo shouldn't hurt anything as long as there isn't any binding right?

Right, high torque/hi speed servos are fine, just be careful how you use them. I hope your using a good digital radio. When it's all ready to go we'll go over the numbers and if you do just what my settings are ... you'll be peachy keen.

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< Message edited by STLPilot -- 8/4/2005 7:40:42 PM >

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/4/2005 8:49:40 PM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		Yes, Im using a futaba 6EXA transmitter for now, I just bought a 7CAP but I need to get a couple recievers as the 7CAP is low band and my 6EXA is high band. Dang Futaba brainiacs! Anyways, what did your all up weight come out to with yours? The saito and the thunder tiger should weigh pretty close to the same. You know what I mean about the canopy floor, and your right, I would like to be able to look in there and physically SEE that all is well. I should be ready to set up the controls tomorrow evening, as our club meeting is tonight at 7, otherwise it would be ready tonight. Just need to cut the cowl, drill the anti rotation pins and glue them in, and finish off the control rods, pull-pull stuff etc... and Ill be ready to go. What was a good starting CG, I read alot of the whiners complaining about the recommended CG feeling off?

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/5/2005 3:07:05 AM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		I've never weighed mine. I set the CG just a hair behind the manual, about 1/2" less.

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/5/2005 4:56:50 AM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		about a half inch towards Nose Heavy, or a half inch towards Tail Heavy?

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/5/2005 11:22:24 AM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		1/2" back

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/5/2005 9:07:23 PM   
j_oly1999


 

Posts: 25
Joined: 12/5/2004
From: Bristol, IN, USA
Status: offline 		So that would make it more nose heavy, correct? Anyways, I got the rudder and elevators hooked up last night, so what would you reccomend for starting throws on low rates?

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/8/2005 2:01:11 AM   
STLPilot


 

Posts: 9188
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		Low rates about 1/2" max. High rates about 1" max.

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RE: Yak 54 .40-.50 ARF need help with pull-pull elevat... - 8/15/2005 2:37:57 PM