RE: Extreme Flight RC Yak 54 - 74 inch!  
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RE: ... - 4/21/2008 6:05:58 PM   
nitro wing


 

Posts: 2338
Joined: 9/29/2003
From: surrey, BC, CANADA
Status: offline 		Hmm. I am using the Bisson also (stock) I dont have any rpm numbers but mine is pulling the Yak with ease.using coolpower 10%.try a different fuel maybe.

< Message edited by nitro wing -- 4/21/2008 6:06:24 PM >

(in reply to hornet dave)
       Post #: 2151

RE: ... - 4/29/2008 11:14:20 PM   
RJConnet



Posts: 561
Joined: 1/6/2002
From: OR
Status: offline 		Hey guys, I need help trimming my 74" yak, it is B46 powered and weighs 12 & 1/2 Lbs. Trimmed for level flight upright the elevator counter balances are about 3/32 In. lower than the leading edge of the elevator so it is carrying a little up elevator for level flight. You would at first think it's probably a little nose heavy, however it balances between the forward and aft figures given in the manual and when the plane is inverted it goes into a very shallow climb. When throttle is closed in upright flight the nose does not want to drop and the plane will eventually stall if left alone. I really don't like having to use a little down elevator to get it on the ground. The engine thrust line is now determined by the offset built into the firewall i.e the engine is mounted at 90 degrees to the firewall (up and down). So what do I need to do, a little up-thrust in the engine maybe, any advice will be appreciated.......RJ

(in reply to nitro wing)
       Post #: 2152

RE: ... - 4/30/2008 12:03:26 AM   
xtraflyr


 

Posts: 1618
Joined: 3/10/2002
From: Chester, NJ, USA
Status: offline
quote:

ORIGINAL: RJConnet

Hey guys, I need help trimming my 74" yak, it is B46 powered and weighs 12 & 1/2 Lbs. Trimmed for level flight upright the elevator counter balances are about 3/32 In. lower than the leading edge of the elevator so it is carrying a little up elevator for level flight. You would at first think it's probably a little nose heavy, however it balances between the forward and aft figures given in the manual and when the plane is inverted it goes into a very shallow climb. When throttle is closed in upright flight the nose does not want to drop and the plane will eventually stall if left alone. I really don't like having to use a little down elevator to get it on the ground. The engine thrust line is now determined by the offset built into the firewall i.e the engine is mounted at 90 degrees to the firewall (up and down). So what do I need to do, a little up-thrust in the engine maybe, any advice will be appreciated.......RJ


Well it could also be the stab incedence? If you set that to zero then a little up thrust seems to be the fix..
Check the incedence,then just try a little bit up up thrust.. trial and error..

Cya
Frank


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(in reply to RJConnet)
       Post #: 2153

RE: ... - 4/30/2008 12:21:42 AM   
nitro wing


 

Posts: 2338
Joined: 9/29/2003
From: surrey, BC, CANADA
Status: offline 		Its the stabs,mine was the same.Get an incidence meter and do the the necessary adjustments,its easy.
You cant measure or eyeball it,its only one or 2 degrees,The stabs are likely angled up a bit at the LE,which causes a down pitch.
You will never trim or enjoy the airplane if you dont take the time to slot the holes a bit and set it up 100%.Somewhere in this thread is a how to, with pics.Good luck.
It flies much better after the fix.

(in reply to xtraflyr)
       Post #: 2154

RE: ... - 4/30/2008 5:03:54 PM   
BarracudaHockey



Posts: 10802
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline 		Fixing the stab is pretty easy, I have the document from EF if you need it. Mine was 2.5 off on one side and .5 off on the other. Just the nature of low cost, over seas, mass manufacturing.

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(in reply to nitro wing)
       Post #: 2155

RE: ... - 4/30/2008 5:20:14 PM   
rcgood



Posts: 51
Joined: 4/28/2007
From: , OR, USA
Status: offline 		Maybe that's why I never enjoyed mine. I just did not like the way it flew period and was always confused when people would rave how good it flies. I assumed coming from EF and the price you pay, it wouldn't have that problem. I wish I would've known about this before it went in so maybe I would fix the problem. Oh well...now I'm looking for something else to put my gear in. Really like the looks of it though.

(in reply to BarracudaHockey)
       Post #: 2156

RE: ... - 4/30/2008 5:35:16 PM   
RJConnet



Posts: 561
Joined: 1/6/2002
From: OR
Status: offline 		Barracuda Hockey,

I would like to see that document you mentioned if it's not too much trouble.............RJ

(in reply to BarracudaHockey)
       Post #: 2157

RE: ... - 4/30/2008 6:44:51 PM   
therupman


 

Posts: 57
Joined: 3/17/2004
From: Brentwood,, TN, USA
Status: offline 		BarracudaHockey,
I'd like to see that document,also.
Bob Ruppel
THERUPMAN@aol.com

(in reply to RJConnet)
       Post #: 2158

RE: ... - 4/30/2008 6:48:23 PM   
BarracudaHockey



Posts: 10802
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline 		Sent to both of you.

I was so happy with my new one (my red one got destroyed by a freakin foamy mid air) I had to get a new canopy for my heli to match it

Attachments
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< Message edited by BarracudaHockey -- 4/30/2008 6:50:25 PM >

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       Post #: 2159

RE: ... - 4/30/2008 8:15:06 PM   
RJConnet



Posts: 561
Joined: 1/6/2002
From: OR
Status: offline 		Barracuda Hockey,

Thanks a bunch, now all I have to do is buy, beg, borrow, or steal an incidence meter............RJ

(in reply to BarracudaHockey)
       Post #: 2160

RE: ... - 4/30/2008 9:04:52 PM   
redflyboy122


 

Posts: 44
Joined: 2/21/2004
From: washougal, WA, USA
Status: offline 		hey barracuda while you are sending it i would love a copy as well if you are able!!

cody.stauffer@und.edu

thanks alot!

(in reply to RJConnet)
       Post #: 2161

RE: ... - 5/1/2008 4:27:29 AM   
FLYMIKE


 

Posts: 570
Joined: 6/20/2006
From: WEST VALLEY, UT, USA
Status: offline
quote:

ORIGINAL: RJConnet

Hey guys, I need help trimming my 74" yak, it is B46 powered and weighs 12 & 1/2 Lbs. Trimmed for level flight upright the elevator counter balances are about 3/32 In. lower than the leading edge of the elevator so it is carrying a little up elevator for level flight. You would at first think it's probably a little nose heavy, however it balances between the forward and aft figures given in the manual and when the plane is inverted it goes into a very shallow climb. When throttle is closed in upright flight the nose does not want to drop and the plane will eventually stall if left alone. I really don't like having to use a little down elevator to get it on the ground. The engine thrust line is now determined by the offset built into the firewall i.e the engine is mounted at 90 degrees to the firewall (up and down). So what do I need to do, a little up-thrust in the engine maybe, any advice will be appreciated.......RJ

If your incidence is on...try adding down thrust.I put about 1.5 degrees on mine and it flew way better....I had the same problem and the incidence wasnt off...

< Message edited by FLYMIKE -- 5/1/2008 4:28:55 AM >

(in reply to RJConnet)
       Post #: 2162

RE: ... - 5/1/2008 7:26:12 PM   
FrankFuss


 

Posts: 66
Joined: 8/12/2007
From: Littleton, CO, USA
Status: offline 		Barracuda

Can you also send me a copy of the document about fixing the stab incidence? Thanks. I have a new 74" Yak sitting in the box in my shop ready for the build. I hope I can learn from all the experience in this forum and avoid any problems.

Frank


< Message edited by FrankFuss -- 5/2/2008 3:19:24 AM >

(in reply to BarracudaHockey)
       Post #: 2163

RE: ... - 5/1/2008 9:20:03 PM   
BarracudaHockey



Posts: 10802
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline 		Sent it to everyone who asked.

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(in reply to FrankFuss)
       Post #: 2164