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From: "John" <downing.j@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1144186@logan.com>
Subject: Re: [FlyRotary] OT: Concrete forms
Date: Tue, 13 Jun 2006 17:29:59 -0400
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Finn;  Been gone for three weeks, so far behind.  Make a box for the 
concrete and pour horizontal,  concrete can weight 3500 lbs a yard and it 
takes one heck of a box to pour vertical.  JohnD
----- Original Message ----- 
From: "Finn Lassen" <finn.lassen@verizon.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, June 06, 2006 11:40 PM
Subject: [FlyRotary] OT: Concrete forms


> This is only remotely related to rotaries (home of my future
> rotary-powered RV-4) so please reply off-list.
>
> After having worked for three weekends putting up block and only having
> done 1 1/2 corners out of 3 so far, I'm seriously considering building
> forms and having the 9 16x16" columns poured rather that building them
> up with 16x16" column blocks.
>
> If anybody here on the list are familiar with making concrete forms, I
> sure could use some advice.
> Columns will be 8' 8" tall and will be supporting 10' long 8x8" lintels
> with a row of lintel blocks on top.
>
> How thick does the plywood have to be to handle a 8'8" tall 16x16"
> column of concrete?
>
> I'm considering using my future 2x4 or 2x6 frame wall studs to form the
> outside corners of the forms - two along each corner of the form screwed
> together (8 per form).
>
> Another issue is the option of tapering the columns: 16x16 at bottom
> tapering to 8x16" at top. In my mind that would not change the structual
> strength of the columns; would save concrete (25%) and possibly require
> less hefty plywood.
>
> I sure could use some advice on both counts.
>
> Keywords here are "cheaper" and "easier".
>
> 16x16" column blocks are now $3.21 a piece - 13 per column.
> The extra concrete to replace one block is about $2.60 (or  $1.95 if
> tapering the columns).
> So I'd mainly just be paying  for the plywood for the forms - seems
> worthwhile compared to the work of "stacking" the 117 column blocks.
> Ideally the forms would also be able to support the lintels and lintel
> blocks so everything could be poured in one go.
>
> Finn
>


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