Message-ID: <373594FC.4E12@burgoyne.com>
Date: Sun, 09 May 1999 08:00:28 -0600
From: "C.L.Keller" <clkeller@burgoyne.com>
To: lancair.list@olsusa.com
Subject: Header tank, etc.
Mime-Version: 1.0

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Marv:
   A long time ago you mentioned you were putting a header tank in your
airplane.  Recently you mentioned putting the battery and hydraulic pump
above the rudder pedals, then talked about access doors on the forward
deck to get to these items.  But you still mention the header tank.  My
header tank pretty well fills the space under the forward deck and
certainly restricts access from the top if the extra items were tucked
under the tank.  Care to tell us how you are accomplishing this?
	Charles Keller


[Hi Charles, et al,

No magic here, for sure... I cut the header tank in half laterally, leaving
only the sump in the center.  This means that my tank is now "T" shaped if it
were stood up on its front.  I also removed the pockets for the forward
hinge canopy, as I'll be doing that hinging from the longerons, a'la Scott
Dahlgren's or Jim Frantz's solutions.  The header tank now only holds about
6 gallons, but I've located the float switch all the way at the top and it 
will automatically keep that tank topped off... should turn on right around
5-5.25 gallons.

There is 7" between the firewall and the front of the tank on both sides
of the sump area, and there is just over 3" available in front of the
sump above the nosegear tunnel.  The batteries (a pair of Hawker Energy
Products model PC680) will mount above the pilot footwell, and the hyd
power pack is mounted above the pax footwell.  The master and starter relays
will be mounted in that open 3" space above the NG tunnel, and I figure 
I've eliminated about 15# of copper by having all that stuff up forward.
I also see that the CG should be moved a bit forward by all of this, as the 
36# of fuel that are missing will be replaced by 28# of batteries, the hyd
powerpack (I really need to weigh that thing) and the relays.  The empty
weight will wind up being decreased by the missing amount of fuel and the
weight savings from the aforementioned elimination of heavy copper
conductors back to the baggage area.

I'll have some photos shortly and will post them on the LML homepage until
I can incorporate them into the construction area of my site.

     <Marv>   ]
  

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