REFLECTOR: Sump Tank Design Change Suggestion

[Brainard, Jerry]

I see how this improves the seal, but how does it address the lack
of radius for the external BID that Hiroo questioned.
 
- jerry
 

________________________________

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On Behalf Of Andy Millin
Sent: Friday, August 04, 2006 2:18 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Sump Tank Design Change Suggestion


Hiroo,
 
When it came time to make my sump, I was concerned about this very
thing.  I built a flange on the inside of the sump.
 
  <http://www.kal-soft.com/velocity/images/pic561l.jpg> 
 
 
It gave me plenty of surface area to make the seal on the inside of
the tank.  I wanted the bid tape to be structural only.
 
Andy

________________________________

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On Behalf Of Hiroo Umeno
Sent: Friday, August 04, 2006 2:03 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Sump Tank Design Change Suggestion



I have the similar arrangements.  What I was talking about was not
the mounting of the sump tank but the construction method of the
tank itself.  Perhaps the kit design has changed since 1999?

 

Hiroo

 

________________________________

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On Behalf Of Lawrence J. Epstein,MD
Sent: Friday, August 04, 2006 10:50 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Sump Tank Design Change Suggestion

 

What I have done is make 2 hardpoints on the floor of the fuselage
under the forward edge of the Sump tank. I then made "legs" using
small mixing cups as a mold and I am putting a rib on each leg to
the sump. I am then securing the sump legs to the floor. The tank is
then supported @ 4 points.

 

Larry Epstein

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On Behalf Of Hiroo Umeno
Sent: Friday, August 04, 2006 1:30 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Sump Tank Design Change Suggestion

 

After my last "incident" on first engine run related to my shoddy
craftsmanship on the sump tank, I started thinking...

 

Admittedly, it was mostly due to the crappy job I did in joining the
sump tank tub with the side wall.  However, I am thinking that the
original design also had some contributing factor to it.  My kit
came with sump tank that had two parts: the part that looked like a
tub and a flat sheet of fiberglass plate that was to be the "back
wall" that was oversized and needed to be trimmed to fit.

 

What this forces the builders to do is to lay the tub over the
sheet, mark the tub outline on the sheet, cut to fit, then lay up
the edges to join the halves.  This layup is a bit tricky since the
plate is rather thin and even after sanding the edges off, it
remains a fairly sharp radius.  To make the matter worse, the tub
side wall does not meet the plate at 90 degrees making the
fiberglass tape wrap the approximately 100 degree corner as it join
the pieces.  It is very easy to get delamination or bubbles in the
lay up which, as I leaned the hard way, is a really bad thing for
something that contains fuel.

 

My suggestion is to change the sump tank design such that two tub
halves are mated flat at the center much like how the nose gear
pants are joined left and right.  This will enable the joining lay
up to be done on a relatively flat side-wall and make it much less
problematic for first-time builders like me.

 

Hiroo



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