How much straight is straight enough

[William C. Harden]

Xavier,

In general you need a flat table if you want the wings to be true;
assuming you are gluing the wing skins to the foam core yourself. In all
honesty, you want the wings built straight as an arrow if you wish to
avoid trim problems.  I have seen wings with a slight bow in the middle
fly ok, but it is a risk.  

In general you want a very flat board to build your planes.  Personally
if it were my building board, I would either fix it or find a better
board to start with.  

Bill


-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Anne et Xavier
Sent: Sunday, January 23, 2005 11:15 AM
To: discussion at nsrca.org
Subject: RE: How much straight is straight enough

This is only .008" to .020" sag. Will it make a difference anyone would
notice in flight ?
Xavier


-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Keith Black
Sent: January 23, 2005 10:31 AM
To: discussion at nsrca.org
Subject: Re: How much straight is straight enough


Try shimming the areas that are sagging. My bet is that you can get it
closer to level.

I would not be happy with that much sag, but then again I'm pretty anal.

Keith

----- Original Message ----- 
From: "Wladimir Kummer de Paula" <wladimir_kummer at ig.com.br>
To: <discussion at nsrca.org>
Sent: Sunday, January 23, 2005 7:31 AM
Subject: How much straight is straight enough


> Yesterday I have built myself a new building surface. I´ve used a 
> 18mmg thick MDF that I reinforced with two aluminum extrusions 
> lenghtwise. I think is pretty straight, but I still noticed a very 
> small (say
> 0.2-0.5mm) gap due to bowing at the middle.
> Is that acceptable?
> How straight is straight enough?
>
> Thanks
>
> Wladimir
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