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Extreme Flight 87" Yak 54 - Build & Fly

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Extreme Flight 87" Yak 54 - Build & Fly

Old 10-20-2005, 07:57 AM
  #6226  
ckoerner
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Here is a stress test for the YAK. I don't know if it's one of the most violent manuevers, but close. [link=http://videos.pitsbros.com/craigk.wmv]Stress Test[/link]

The same day Wayne was doing rolling harriers real low. I can't believe there where not any grass stains on the wings. Wayne can really ring this plane out.
Old 10-20-2005, 08:17 AM
  #6227  
DrFun
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Wow, that looked cool!
Old 10-20-2005, 12:22 PM
  #6228  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I am finally putting my Yak together and am wondering about spinners... Since I am using a tuned pipe it seems that I will need a little nose weight so getting a Tru Turn seems like a good choice. I will also use a 23X8 Mejzlik or a 24X8 Menz prop... I know many are using a 4" P-51 style... How has that one been working? Would a smaller spinner be a better choice?

TIA!
Old 10-20-2005, 03:17 PM
  #6229  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

4" tru turn ultimate style, menz cut, lightened back plate! [8D]
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Old 10-20-2005, 05:00 PM
  #6230  
torqmeister
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I have the 4" & the 3 1/2" Tru Turn P-51 style spinners. I think the 3 1/2" looks the best.
Old 10-20-2005, 07:03 PM
  #6231  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Did anyone have to open up the elevator servo cutouts to allow for maximum throw? Im talking about the slot for the servo arms...I can get 60 deg but I would have to cut a slot in the sheeting to allow the 4-40 bolt to pass thru..
Old 10-20-2005, 08:41 PM
  #6232  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

yes! you have to trim a little bit! here are some pics!
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Old 10-20-2005, 08:51 PM
  #6233  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Jose..thanks for the other pics also..Im not talking about trimming the slot lengthwise..The 4-40 screw that attaches the ball link to the the SWB arm will actually compress the sheeting down..If I want to get the full throw I would have to cut a slot to allow the head of the screw to clear the sheeting..I could just dial the throw down with the dual rates..I have my ATV's at 140%
Old 10-21-2005, 07:18 AM
  #6234  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Go ahead and widen the slots, I think most of us had to do that, some more than others.

Tom
Old 10-21-2005, 12:33 PM
  #6235  
Mike Parsons
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: ckoerner

Here is a stress test for the YAK. I don't know if it's one of the most violent manuevers, but close. [link=http://videos.pitsbros.com/craigk.wmv]Stress Test[/link]
Sweet! I love the way this plane tumbles. [link=http://www.epowerflight.com/Media/87yak/yaktumble.wmv]Semi-Anuerism[/link]


A couple of photos to share also. I have the full size and they may cool Desktop backgrounds

-Mike

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Old 10-22-2005, 02:50 PM
  #6236  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Ok..what is the trick to get both elevator servo arms centered? Im using a 9C, SWB arms, and 8611's..I can get 1 arm 90 deg but the other is off by a few degrees..I can however change the one that Im able to get at 90deg to match the other..the only problem with that is I can only get 50 deg of down..I dont want to get a matchbox or use subtrims if I dont have to..
Old 10-22-2005, 03:17 PM
  #6237  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

get a servo programer, or use subtrims!
Old 10-22-2005, 03:19 PM
  #6238  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Adjusting endpoints and subtrim are the only way to get both servos to match through full travel in both directions...

Old 10-22-2005, 03:40 PM
  #6239  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I was afraid you guys would say that..then basically the ailevator feature is really worthless[:@]
Old 10-22-2005, 04:02 PM
  #6240  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

NOP! ailevator feature gives you the chance to use 2 diferent chanels instead of using just one chanel and you have the chance to adjust sub-trim and end points diferent on each chanel!
Old 10-22-2005, 04:19 PM
  #6241  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I see your point but I always hear how you should use as little subtrim or end point adj as you need to because you are decreasing the speed of one servo vs the other

I messed around a bit more with the linkage and I had to decrease the endpoint on 1 servo to 130 from 140..I can get 65deg up and 50 down and they are even thru out full travel
Old 10-23-2005, 09:06 PM
  #6242  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


Guys,

For the following season I plan on getting the EF Yak. And I have a question on servos. I am getting all new stuff for this plane so I am all ears . I was planning on getting Hitec 5645's all through out the plane. Do you have any suggestions on what to do for a rudder servo. I was looking at the Servo Power Gearbox. If I put a 5645 or a 5625 in the gear box I would have over 655 oz of power. My question is, If I went that route how would I mount it? They cost around 40 bucks, and you also have to get a 3in arm for about 8 bucks. It seems duable, are they worth the extra 40 bucks? heres the link http://www.servocity.com/html/robotzone_servos.html

Prime Time
Old 10-23-2005, 09:10 PM
  #6243  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

ORIGINAL: Gasser Flyer


Guys,

For the following season I plan on getting the EF Yak. And I have a question on servos. I am getting all new stuff for this plane so I am all ears . I was planning on getting Hitec 5645's all through out the plane. Do you have any suggestions on what to do for a rudder servo. I was looking at the Servo Power Gearbox. If I put a 5645 or a 5625 in the gear box I would have over 655 oz of power. My question is, If I went that route how would I mount it? They cost around 40 bucks, and you also have to get a 3in arm for about 8 bucks. It seems duable, are they worth the extra 40 bucks? heres the link http://www.servocity.com/html/robotzone_servos.html
Prime Time

PT get a 5955 and an SWB arm. set it and forget it.

JOhn

Old 10-23-2005, 09:21 PM
  #6244  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I knew that my fuse has a slight twist in it, but before I worked the twist using Bodyworks technique I wanted to mount the wings and stabs and look at from that perspective. I know from using a level that my wings and stabs are about 3/4 of a bubble off from one another... The wings fits great -- nice and snug. The stabs fit great too, until I looked at them closely... The twist is there, but it's not very bad. However, when looking from all angle I could see that when the elevators are flush with the stabs that they don't line up! I put my Robart incidence meters on the stabs and there is 2 degrees difference between the two. At this point I don't know which one is at the correct incidence...[:@] And only one of the four 6-32 cap screws would thread into the fuse and blind nut...

I know others had the twist -- has anyone else seen the incidence problem?
Old 10-23-2005, 09:43 PM
  #6245  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Galen,

My new Yak also has a slight twist. I have not checked the incidence though (and probably wont)
My advice is to go fly the plane as is. See what you think. If you think its doing something weird due to the incidence then you can fix it but my guess is that the plane will fly fine.
You may save yourself a lot of hassle trying to fix a problem that may or not affect the plane in an adverse way.

Also, if one of your blind nuts are stubborn, run a 6-32 tap into it. That should help.
Old 10-24-2005, 06:54 AM
  #6246  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Just quick, the weight requirements in Oz are 7kg (~15.5lbs), any larger and a special permit is required.

Would it be able get under this with a CF spinner, wood prop, std muffler, minus the pants.
Old 10-24-2005, 07:09 AM
  #6247  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Easy. Mine weighs 15Lb 8 Ounces with KS cannister 250g, Mejzlik prop and Spinner and i run lipo's on ignition and receiver. You could lose wight on the prop and cannister setup and no more is required on the battery side of things. However, you should still have enough margin for redundancy if you wanted to go down that route.
Old 10-24-2005, 07:42 AM
  #6248  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Mine is 15.25 lbs with the setup you described (CF spinner, wood prop, etc), so if I dropped the wheel pants I would be well under 15 lbs.

Tom
Old 10-24-2005, 02:07 PM
  #6249  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

John,

Why not get the new HSR-5995TG Ultra Torque for the same price. With 417 oz of Torque with .12 sec/60 degrees
heres the link http://www.servocity.com/html/hsr-59...ra_torque.html Looks good to me.

Prime time
Old 10-24-2005, 02:15 PM
  #6250  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: Gasser Flyer

John,

Why not get the new HSR-5995TG Ultra Torque for the same price. With 417 oz of Torque with .12 sec/60 degrees
heres the link http://www.servocity.com/html/hsr-59...ra_torque.html Looks good to me.

Prime time
I had called Hitec last year when I was about to buy this servo and they talked me out of it, they told me to get the 5955 instead, I can't remember why.

John

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