REFLECTOR: J B weld

Sat Sep 29 19:38:04 CDT 2012

Noel;

I repaired a tank seam on the rad in my Dodge van (metal tank) with JB Weld
about 14 years and well over 100,000 miles ago, and it's still just fine.

Al

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Gattenby
Sent: Saturday, September 29, 2012 11:19 AM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: J B weld

At what temp does J B weld get soft?  As in can I use it on an automotive
radiator?

Noel

On Sep 27, 2012, at 10:44 AM, "Jack Prock" <jackprock at wavecable.com> wrote:

Hi Geoff,

Before you go chasing the EGT on one cylinder, you should watch
http://www.eaavideo.org/video.aspx?v=1316946190001
He gave a talk on EGT's at Oshkosh that was very interesting. It was about
the mistakes people make with EGT's and what
they really mean if anything. If your CHT's are fine, you should be fine. 

It is a bit long, but I highly recommend it before you start ripping things
apart.

Jack

From: Geoff  <mailto:geoff.gerhardt at gmail.com> Gerhardt 
Sent: Thursday, September 27, 2012 4:31 AM
To: Velocity Aircraft Owners and Builders  <mailto:reflector at tvbf.org> list 
Subject: REFLECTOR: Flight testing going well...18hrs in, new video

Guys, 

Flight testing is going well, I've got about 18hrs in.  I'm still not able
to just go out and fly - always little fixes and tweaks (that's the fun part
for me, tho).  I have learned, tho, not to immediately try to correct an
issue, but learn more about it first.  I've been chasing a hot cylinder and
have been trying to cool it with better airflow.  After reviewing data logs
and confirming it on my last flight, I now realize that its likely a
combustion problem.  The EGT for that cylinder is always high.  Because of
my aggressive airflow modifications, even in spite of that high EGT, the CHT
is ok now.  I'm going to pull out the injector nozzle this weekend and give
it a good cleaning.  If that doesn't work, I may try to ream it out a
little.  I tried to put an oil collection reservoir as I was tired of wiping
oil off the cowling, but it introduced too much back pressure, and all of a
sudden I had a bunch of oil leaks to deal with (a rather nasty surprise of
seeing oil all over the inside/outside of the cowling after a 2.5hr flight).
Got all those cleaned up and removed the oil recovery system.  I think I'll
try to vent the breather into the exhaust.

Other than those issues, its been going pretty well.  I've been playing with
fuel settings, altitude and efficiency.  I typically head up to 8-10,000'
and run LOP.  At 10k' I am usually ~150ktas, and 8gal/hr.  I love the
high-speed descent into the airport.  I report 10mi out to the tower and I'm
in the pattern in no time - I think they're getting used to me zipping in as
opposed to the C172's and warriors they're used to.

Here's a recent video I took taking off with a belly-mounted camera looking
back.  Its kinda neat in that it looks like I'm zooming the lens as I gain
altitude.  Yes, I know, it takes me a long time to get off the ground.  I
actually have another prop coming that might help.  A Cozy owner had a
left-turning Catto that he no longer uses.  Its a 64x76, mine's a 66x74.  I
suspect it'll get me off the ground much quicker.  He didn't want much for
it, so it'll give me a backup - I'll send mine back to Catto at some point
to get it repitched or just keep it for a long-range cruise prop as it is.

Geoff
(I uploaded it in high-res so make sure you switch to 1080p)
http://www.youtube.com/watch?v=JhNZBc-inbw

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