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                           RV7-List Digest Archive
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                     Total Messages Posted Sat 07/19/03: 1
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Today's Message Index:
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     1. 01:50 PM - tip tanks, continued  (Len Loudis)
 
 
 
________________________________  Message 1  _____________________________________


Time: 01:50:44 PM PST US
From: Len Loudis <n713ml@yahoo.com>
Subject: RV7-List: tip tanks, continued

--> RV7-List message posted by: Len Loudis <n713ml@yahoo.com>

Folks,
Thanks for the thoughts. Couple more questions:  1) I do not have a
clue how to reach Johanson for literature, etc, and can't find him on
the web. Is Van's his only outlet? 2) In terms of plumbinq QB, are the
tips flowing directly into the mains via a check valve of some sort? Or
plumbed through a four-tank fuel selector as in my Piper Cherokee
235-C?
3) Any information on whether Johanson will be at OSH?
Thanks,
Len
> From: "Francis, David CMDR" <David.Francis@defence.gov.au>
> Subject: SEC: UNCLASSIFIED RE: RV7-List: Tip tanks
> 
> Len,
> I am going for the Johanson tanks, which are now in production for
> the RV7/8
> sheared tips. I saw the prototype and they look excellent quality.
> Price is
> A$3500.00. 
> 
> There are alternatives:
> Roll your own tips by installing a membrane or coating in the Vans
> tips, and
> add necessary bulkhead, filler, drain and exit plumbing, & nav lights
> if
> applicable. The Vans tips are permeable to fuel. So the membrane,
> coating &
> bulkhead will reduce your fuel capacity by a litre to two compared to
> the
> Johanson tanks, which are made of fuel proof fibreglass.
> 
> Also someone somewhere installed a aluminium pipe tank in the leading
> edge
> of a RV. Very neat, holds about 8USG each, the tube tank slides into
> the
> leading edge rib lightening holes. 
> 
> Both the Johanson and tube tanks do not seem to require strengthening
> of the
> outer spar. These options are cheap but labour intensive. 
> 
> VH-VIL has tip tanks plus two aluminium wedge shaped tanks that fit
> in the
> triangle behind the seat backs, just over the flap mechanism. They
> are
> removable and leave most of the baggage compartment free for, guess
> what -
> baggage. Easy to build in aluminium, cheap, but gives aft c of g and
> also
> reduces your baggage weight allowance. Fuel in the wings & tips is
> the most
> structurally efficient place to carry fuel due to lack of wing
> bending
> moment. These tanks were very neat and well thought through. 
> 
> I have also seen one Australian RV6 with four leading edge tanks. He
> wishes
> to fly to Oshkosk across the big puddle. With 80 odd usgallons per
> wing he
> had to strengthen his outer wing spars and his bladder. He has a
> removable
> tank for the right seat giving over 20 hrs endurance. He is thinking
> of a
> sleeper seat too!
> 
> Regards, David Francis, tipping the canoe of VH-ZEE, Canberra,
> Australia.
> 
>                 -----Original Message-----
>                 From:        Len Loudis [mailto:n713ml@yahoo.com]
>                 Sent:        Thursday, 17 July 2003 10:03
>                 To:        rv7-list@matronics.com
>                 Subject:        RV7-List: Tip tanks
> 
>                 --> RV7-List message posted by: Len Loudis
> <n713ml@yahoo.com>
> 
>                 I would welcome thoughts on installation of tip tanks
> on my
> -7A. Given
>                 my mission for the plane, that is my intent. I am
> less
> certain about
>                 plumbing into QB wings (still open), whether there
> are
> alternatives to
>                 the Johannsen tanks (as listed in the Vans catalog),
> and so
> forth. So
>                 please feel free to ramble on
> 
> 
> 
> 
> 
> 
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> 
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> 
=== message truncated ===


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