Aileron Balancing P...
 
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Aileron Balancing Procedure?

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Jonathan
(@jonlanderosgmail-com)
Posts: 2
New Member
Topic starter
 

Good morning from California! I'm new to the group.

I've recently been recruited to help a friend recover his Stinson 108 ailerons in Polyfiber, which I have experience with.  What I'm having difficulty locating is a procedure to balance the ailerons once their covered. 

I've asked my friend if he has any manuals, but he has yet to locate them. 

Does anyone know where I can find the procedure? I'm happy to purchase any required manuals. I'm just hoping to find the correct one first. 

I'd prefer to know what's needed to balance the surface before we start putting fabric to structure. 

Thanks in advance!

Jon

 
Posted : 13/08/2021 3:08 pm
Will Ware (Webmaster ISC)
(@stinsono)
Posts: 369
Reputable Member Admin
 

The manuals from the 40’s are pretty light on technical. I just looked in the Stinson general service manual and there was only how to remove and install the aileron (see image below). In the table of contents I did not find anything specific about covering or balancing. I would suggest Univair as they are the TCDS holder. then report back what you find out. Thanks

 

 
Posted : 13/08/2021 3:58 pm
Will Ware (Webmaster ISC)
(@stinsono)
Posts: 369
Reputable Member Admin
 

Preston Moore found this….

 

 
Posted : 13/08/2021 6:32 pm
Jonathan
(@jonlanderosgmail-com)
Posts: 2
New Member
Topic starter
 

Thanks for all the info! I'll take a look at the Univair site! I've taken a glance already, and there looks to be some good potential info!

 
Posted : 14/08/2021 3:22 pm
lawheelock
Posts: 774
Prominent Member
 

When I was recovering my Stinson in about 1977, I called Univair and asked this about aileron balance.  I spoke with Craig (?) who was their engineer at the time.  He said he researched the Stinson drawings and could not find anything.  I did observe that there are balance weights in the surfaces but he did not find what Preston More has found.   But he also said that at the speeds the Stinson has and the fact that the ailerons were fabric covered, they are naturally dampened in vibration one does not have to be concerned about flutter as long as they are reasonably well balanced. 

I have saved this image for future reference.

 

Larry Wheelock

Larry Wheelock, A&P/IAStinson 108 N584LW 180 LycTexas in Winter; Indiana in Summer

 
Posted : 16/08/2021 4:33 am
Will Ware (Webmaster ISC)
(@stinsono)
Posts: 369
Reputable Member Admin
 

@Larry, I bet over the years you have collected a TON of stinson tech info. Would you ever consider uploading all of that to a Dropbox or something to be added to the club data? I can make it easy for you to do. 

This post was modified 1 year ago by Will Ware (Webmaster ISC)
 
Posted : 16/08/2021 5:27 am
Charles L Gruby Gruby
(@charlesgruby)
Posts: 72
Trusted Member
 

@lawheelock Hi Larry, I once was at a Flyin where a fly baby made a split s and did fly by at a few feet off the ground when all of a sudden we all saw a blur and the airplane smacked the ground level. The wings looked as if a giant twisted them until all the ribs were broken. The ailerons had moved from a +90 to a -90 degrees. The airplane had experienced aileron flutter right before our eyes. The airplane did not sustain very much damage from impacting the earth, but the wings were kindling wood. I didn't think that could happen at such a low speed, but it did.

Cheers, Chuck G

Chuck Gruby
Stinson 108-2 NC9502K
Petal, MS

 
Posted : 21/08/2021 12:56 am
lawheelock
Posts: 774
Prominent Member
 

@charlesgruby 

Most likely not a low speed and with a high G situation coming out of a split S. 

Larry

Larry Wheelock, A&P/IAStinson 108 N584LW 180 LycTexas in Winter; Indiana in Summer

 
Posted : 26/08/2021 4:43 am
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