REFLECTOR: J B weld

Sat Sep 29 13:31:18 CDT 2012

Hi Noel,
You can use it on a radiator: as a -temporary- repair. It probably won't
soften period after it's cooked off and cured. I would not use it on any
radiator on an aircraft. You might consider it a -permanent- repair on a
lawnmower or other non-critical equipment's radiator. You can find lot's of
tractors with radiators stopped with JB Weld. But a leak on them is not
critical. It is an amazing epoxy based product, but not normally considered
a permanent fix in critical areas.

Mark

On Sat, Sep 29, 2012 at 1:18 PM, Gattenby <gattenby at tulsaconnect.com> wrote:

> 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 Gerhardt <geoff.gerhardt at gmail.com>
> *Sent:* Thursday, September 27, 2012 4:31 AM
> *To:* Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> *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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