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701 Elevator twist?

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Phoenix3(at)cox.net
Guest

Posted: Mon Mar 13, 2006 6:26 pm Post subject: 701 Elevator twist?

Hello,

 

Despite my best efforts, I seem to have built some twist into the

horizontal stabilizer of my 701.  When getting ready to attach the

elevator hinge plates, I checked the level of the stab and it appears to

be off.  Over the 2220 mm length, there is about 7 mm of twist.  That

is, with the left end level and the right end trailing edge at the same

height, the right hand front is raised about 7 mm.  I calculated a 0.34

percent twist and think this is probably acceptable, but really don't

know.  I assume that with all rivet holes drilled and most riveted, it's

pretty much locked into this configuration.  Any insights?  Thanks.

 

Chuck Kyle

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p.mulwitz(at)worldnet.att
Guest

Posted: Mon Mar 13, 2006 7:34 pm Post subject: 701 Elevator twist?

Hi Charles,



I can only speak from my Radio Control experience.  In that arena 

Anything Will Fly.



I suspect your small amount of twist will be completely unnoticeable 

in flight.  Perhaps a small amount of roll trim will be needed for 

complete hands-off level flight.  If that is the worst problem you 

have with your new plane than all I can say is "Congratulations on a 

job well done."



Paul

XL wings

Over the 2220 mm length, there is about 7 mm of twist.



 	  Quote: 	
		  Chuck Kyle

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graham(at)601hd.com
Guest

Posted: Mon Mar 13, 2006 9:17 pm Post subject: 701 Elevator twist?

Chuck,

You can probably fix it by drilling out the skin rivets, mounting it dead

flat on the table - perhaps even with a hint of reverse twist, and

re-riveting.  It fixed a similar problem that I had on my rudder though I

didn't really expect it to.  I guess there is some play in the rivet holes.

Alternatively you could redrill it to the next rivet size or just accept

that you subconciously but deliberatly built in a cunning and clever torque

compensation feature - assuming the prop spins the right way.



Graham Kirby

601HD



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larry(at)macsmachine.com
Guest

Posted: Tue Mar 14, 2006 7:15 am Post subject: 701 Elevator twist?

Chuck,

I played with ailerons that were out from the prescribed twist and also 

had my center section out a considerable

amount and both were corrected by drilling the rivets out and jigging to 

correct the twist.  The center-

section on one line across the seat pan had to go to A5s to get 

correction.  Each were measurably dead on

after this was done.

It's likely your stabilizer would be correctable by just drilling out 

the rivets, adjusting and re-riveting.  It would certainly

be worth the small amount of time to fix it.  Clecos will show you how 

much you can correct after the rivets are out.

Good luck,

Larry McFarland - 601HDS



Charles Kyle wrote:



 	  Quote: 	
		  



Hello,

 

Despite my best efforts, I seem to have built some twist into the

horizontal stabilizer of my 701.  When getting ready to attach the

elevator hinge plates, I checked the level of the stab and it appears to

be off.  Over the 2220 mm length, there is about 7 mm of twist.  That

is, with the left end level and the right end trailing edge at the same

height, the right hand front is raised about 7 mm.  I calculated a 0.34

percent twist and think this is probably acceptable, but really don't

know.  I assume that with all rivet holes drilled and most riveted, it's

pretty much locked into this configuration.  Any insights?  Thanks.

 

Chuck Kyle

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JAPhillipsGA(at)aol.com
Guest

Posted: Tue Mar 14, 2006 7:29 am Post subject: 701 Elevator twist?

Chuck, the fellow with the idea of putting it on a flat table and re-drilling 

and riveting is probably the right answer. Every time you deviate from 

standard design on some surface contributes to the whole package and they might add 

up to some instability or reduced performance. I had a problem with the 

elevator skin and had to re-drill and rivet some. What I found was that putting  J B 

Weld in the extra holes sealed them up just fine and a little light sanding 

made them smooth again. After primer and paint they are gone. FWIW, Bill 

Phillips N505WP

do not archive

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rjscep(at)yahoo.com
Guest

Posted: Tue Mar 14, 2006 10:17 am Post subject: 701 Elevator twist?

 	  Quote: 	
		   I'd like to know if your scratch building or from

 the kit??


	


--- Charles Kyle <Phoenix3(at)cox.net> wrote:



 	  Quote: 	
		   

 <Phoenix3(at)cox.net>

 

 Hello,

  

 Despite my best efforts, I seem to have built some

 twist into the

 horizontal stabilizer of my 701.  When getting ready

 to attach the

 elevator hinge plates, I checked the level of the

 stab and it appears to

 be off.  Over the 2220 mm length, there is about 7

 mm of twist.  That

 is, with the left end level and the right end

 trailing edge at the same

 height, the right hand front is raised about 7 mm. 

 I calculated a 0.34

 percent twist and think this is probably acceptable,

 but really don't

 know.  I assume that with all rivet holes drilled

 and most riveted, it's

 pretty much locked into this configuration.  Any

 insights?  Thanks.

  

 Chuck Kyle

 

 

 

 



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ding(at)tbscc.com
Guest

Posted: Tue Mar 14, 2006 1:55 pm Post subject: 701 Elevator twist?

Charles,

                As others have said, I think you can correct this if you

choose to. The Avex rivets seem to swell to fill even slightly oversize or

offset holes. I had to make a similar slight correction on my stabilizer

after partial riveting. I drilled out the rivets and had to jig it slightly

opposite to correct, as the rivets tended to pull it back to the same twist

as they were set. Came out perfect.

                                                                        Lynn



Corry, PA

PS-  By the way, an FAA inspector once told me that "jig" is now politically

incorrect. The proper word is now "fixture".

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