Need some Focus II help

Sun Jan 30 13:37:29 AKST 2005

Thanks Ed.

I have cut off approximately 1 inch of material from the box sides and I
still have 1/8 inch clearance to the spinner backplate.  I may need to
cut more material off, but I have been going slow (iterative cutting
process) because once the material comes off it can't go back on.  

Bill

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Ed White
Sent: Sunday, January 30, 2005 4:15 PM
To: discussion at nsrca.org
Subject: RE: Need some Focus II help

Lining up the engine was some fun but not excessively
so.  I'm using a YS 140, that, without a header will
fit in the cowl with no cutouts.  I first mounted the
cowl on the fuselage (using Don S's recommended method
with little bits of the antenna tube - and I HIGHLY
recommend this).  Then I attached the engine to the
mount.  I had enough room to temporarily clamp the
mount to the engine box face and put in in the plane
dry.  Then I could install the cowl and measure how
much I needed to remove from the engine box to fit it
into the fuselage and have the correct clearance from
the cowl to the spinner.  Yes it was a bit of trial
and error, cut and fit, but it gets there without too
much difficulty.  Then you glue it in.  Once the
engine is mounted I did need some cowl cutouts to
clear the header.  After one season of flying
everything is tight and in place.

Ed

--- "William C. Harden" <flyinbill1 at bellsouth.net>
wrote:

> Thanks Eric, your input is much appreciated.
>  
> Bill
>  
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]
> On Behalf Of Grow Pattern
> Sent: Sunday, January 30, 2005 11:41 AM
> To: discussion at nsrca.org
> Subject: Re: Need some Focus II help
>  
> Bill,
>        There is enough "give" in the assembly to
> allow you to take a
> 1/16"  off the rear face or the right-hand side to
> get a bit more side
> thrust.
>  
> The down thrust is controlled by raising the rear of
> the structure with
> a shim where it notches into the former on the u/c
> support plates. I
> have done four of these this way. (The only one that
> failed was the one
> that hit a tree after the battery terminal came away
> from the cell!.)
>  
> The "box" does not shift position. It is still an
> "open box" and the
> sides are stiff enough to stay pointed  forwards.
> Capping the top and
> bottom locks it in place.
>  
> Lining up the engine is a bunch of fun. The cowl of
> the FOCUS-2 is
> repositioned so you have to line up the mount and
> engine in one go. I'll
> send you a picture of a tool that I made to do this
> if it is not already
> out in MA.
>  
> Regards,
> Eric. 
> ----- Original Message ----- 
> From: William <mailto:flyinbill1 at bellsouth.net>  C.
> Harden 
> To: discussion at nsrca.org 
> Sent: Sunday, January 30, 2005 10:35 AM
> Subject: Need some Focus II help
>  
> I need some help with the engine box assembly for
> the Focus II with
> respect to adding more right engine thrust.
>  
> I have read Don Szczur's write up in modifying the
> engine box to add
> additional right thrust and some down thrust.  But,
> he didn't say
> anything about breaking apart the already assembled
> (parts glued
> together) engine box.  
>  
> For those of you who have made this modification,
> did you disassemble
> the box, make the mods and then reassemble (keeps
> everything aligned if
> you do), or did you make the mods with the box
> assembled and simply
> install the modified box into the fuselage?  
>  
> It seems that the engine box firewall will shift in
> position inside the
> fuselage cowling area if the box was not
> disassembled first and then
> reassembled such that the desired amount of engine
> thrust is built in at
> the firewall.   It is a matter of building in the
> desired amount of
> engine thrust at the engine box firewall, or
> changing the location of
> the firewall by shifting the box inside the cowling
> area such that the
> firewall has the desired amount of engine thrust.
>  
> So, what is the recommended procedure??  
>  
> Bill
> 

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