Hey Walter, the weather also cleared down here near Seattle this afternoon
so was also able to get back in the air for flight testing and runway
landing practice. Best landings since the perfect one I did on my first
flight test.
My wheel axels now seem tight. My axle caps didn't need to be shaved as they
had sufficient gap for tightening, but my axles seem slightly under sized.
So, I filled the few thousands of an inch with aluminum tape as shims. Now
the clamping friction does not let the axle shift under landing loads. So
shimming is another option to consider in addition or instead of shaving the
axle caps.
I understand the comments about just building the Murphy hydraulic system
and don't over think the problems. It is different than most certified
systems, but seems okay. My check valves at the hand pump don't seem to leak
at all (yet) and my system holds pressure for a week or more. With our mild
temperature changes I watch the pressure go up and down but return to the
same pressure at same temp. So, I'm keeping the pressure relief solution in
the back of my mind but leaving the system stock.
This makes hydraulics an operational solution. Low or no pressure when
hangared or extended floating, pump up the pressure for moving/taxiing,
check pressure again right before takeoff and landing (during last GUMP).
Fog in the morning but the promise of more flight testing in the sunny
afternoon tomorrow.
Eric Fogelin
Elite Amphib N645E
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of Walter
Klatt
Sent: Sunday, January 18, 2009 4:03 PM
To:
rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Amphib Questions
Yeah, when I am ready to do it, will have to check the archives, and talk to
people here again. Big job to take all that apart, and want to do it right.
Just got back from a flight out to the lake. Finally got a break in the
weather and no fog today, and absolutely beautiful, actually. Big change
from a few weeks ago, where we had snow and cold here. Had a bit of an
inversion, where the OAT was +21 C (70 F) 2500 ft, basically summer weather.
Couldn't complain with +12 and sunny on the ground either.
Walter
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of Ken
Sent: January 18, 2009 1:25 PM
To:
rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Amphib Questions
Probably but my computer is warmer than my shop...
But it does seem wrong to build a system that is pretty much guaranteed
to blow a line sooner or later. It should be easy to make it foolproof
with one relief valve and not leaving the valve in the center position.
Never underestimate a fool, but I still like the foolproof challenge ;)
I presume you have the messages where Angus had to go up a size on the
cross section of a piston o-ring to stop his leak. And the other one
where apparently the leakage was past the piston by way of the threads
where the piston screws onto the shaft.
Ken
Walter Klatt wrote:
Sure you guys aren't over thinking this a bit? The problem is solved
pretty
easily by where you leave your selector. EI., just don't leave it in the
up
position on a hot day and switching it back and forth does relieve some
pressure. For me, the bigger nuisance is losing pressure on the up side,
and
main wheels dropping slowly. I am planning to redo my O-rings this year,
and
hopefully can find ones that will do the job better.
Walter
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