4-40 or 6-32 control arms?

[Bill Glaze]

ED:
A few years ago, there was quite a dialogue about this.  One of the 
participants was Dick Hanson, a man highly respected in Pattern and 
other disciplines.  The subject came up about a couple of individuals 
who were looking for extra strength on aileron and elevator actuator 
bolts.  Dick said, specifically, do not get hardened bolts or anything 
exotic.  He said such material won't stand up under vibration nearly as 
well as common rolled thread material, or, for that matter, some of the 
standard Home Depot or Lowe's bolts right off the peg board.  He said 
that the ductility is what prolonged their life; that he had never had 
one break.  I believed him then, and still do.

Bill Glaze

Rcmaster199 at aol.com wrote:

> In a message dated 2/14/2005 12:22:29 AM Eastern Standard Time, 
> ed_alt at hotmail.com writes:
>
>     I've been using 6-32 bolts to make the control horn arms for my 2M
>     setups so far.  It seems like that might be overkill and that 4-40
>     would suffice.  Is it OK to go lighter like this?
>      
>     Thanks
>     Ed A.
>
> Ed I wouldn't do that especially on ailerons. I have had 4-40's snap 
> off like twigs on 90 sized models before. The vibration kills them.
>  
> Matt

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