4-40 or 6-32 control arms?

[Dean Pappas]

Hi Ed,
We were breaking 4-40s on 60 ships, occasionally.

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Bob Kane
Sent: Monday, February 14, 2005 8:38 AM
To: discussion at nsrca.org
Subject: Re: 4-40 or 6-32 control arms?


When Midwest released their 1/4 scale series of
aerobacic planes (Extra, Giles, etc.), they used 4-40
screws for control horns. The screws were known to
fail so they switched to 6-32. I have been using 6-32
screws on my pattern and 120 sized scale planes
without a failure yet, I would not want to risk a
plane to save a fraction of an ounce. 

--- Ed  Alt <ed_alt at hotmail.com> wrote:

> BlankI'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.
> 
> 


=====
Bob Kane
getterflash at yahoo.com


		
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