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Date: Tue, 15 Aug 2006 09:33:38 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] RWS EM-2 tips wanted..
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David Staten wrote:

>
> Also.. just a little feedback.. for Tracy (cause I know he will read 
> this eventually).. basing this suggestion on something someone 
> attributed to Al Wick on reducing human factors. On the back of the 
> EM2.. there is a 15 pin dsub and two 25 pin dsubs.. with the 
> admonition not to get the connectors mixed up. If mixing up the 
> connectors would cause failure of a smoke test (let the smoke out, and 
> the box doesnt work anymore)... then wouldnt it be a good idea for 
> future generations of this device have non-compatible connectors for 
> the various plugs? Like a 37 pin in lieu of one of  the 25's.. or one 
> 25 pin being male and the other 25 pin being female? I'm not trying to 
> complicate your world, but something like this MIGHT reduce one 
> possible link in the chain of failure. That being said, i dont even 
> know if this is a solution for a problem that hasnt manifested itself.
>
Whittle you a pin out of some hard plastic.  Stick it in a unused hole 
on the plug side of one of the connectors, and remove the corresponding 
pin on it's mate.
Whittle another plastic pin and plug a hole in a different spot on the 
other side.
Be careful not to be rough when plugging in. 

This technique is used a lot in electronics.  It allows for the same 
connector to be used in many places, keeping the parts count lower.  
This is a major concern, especially when you're doing such small runs as 
the EM2.

Another solution is to cut a spacer to fit between the plugs and then 
tape/bolt/epoxy them together so that they go in and out as one unit.

-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |