As with most of which
I speak, 90% was lost in my inability to articulate in a language perceptible
to the soberness of my readers. My point regarding the air in lines
being an accumulator was missed. I believe you dissected it below by
pointing out the various natural paths by which air makes it’s way back to the
pump. I believe your premise was that all of the air gets back to the
pump. This would then make my premise that the air would act as an
accumulator initially but thereafter work it’s way out. Thus, one would
have longer time between chirps (TBC) until the air worked it’s way out.
Then, ops normal (occasional chirpage ) would
resume.
However…………. I
rebuilt two main cylinders Friday and flew all weekend. The results of
much air introduced into the system were quite contrary to my theory. It
was pure chirpaholism for the first hour. Thereafter, I ran the pump for
about 30 seconds (dump valve open) upon each gear extension. Now after 6
such cycles it seems to be “better”. I need more cycleage to tell for
sure. Or maybe more cylinders rebuilds.
BTW, does it bother
only me that the HC-06 cylinder rebuild kit does not come with a thread
seal? I think a cylinder rebuild kit should include all the O rings and
seals that the cylinder entails. Especially, since our leak headache
discussion is internal High/Low. The seal is for the shaft at the
piston. It was only a minor set back (90 mile drive and two
hours at American Hydraulics with help from Rose). Help us here Tim O.,
Joe B.???? HC-06 no thread seal. Is it the kit supposed to
have one? Mine haven’t several times.
On the secret switch
note, I am one of those High pressure leaks to Low pressure side and sets low
pressure switch guys (after some duration + 1 hr). The opening of the
dump valve, after the switch down does nothing, allows pressure off the low
pressure switch and fires up the pump. That’s why I keep going back to
the shuttle valve test. I find mine (once reversed) now in
correctly. The idea that both switches are set and anyone CAN NOT
get gear extension is beyond my fathom ability (ok, maybe the dump valve
handle could fall off). In other words, if the fluid is leaking to the
low pressure side, then why do it not depressurize through the shuttle
valve? The pump would have been in the …… (I don’t know?)???
BdBdBdBdBd (finger lapping against flapping lips)
On a parallel
solution, my Berkut buddy (James Redmond) and all his Berkut friends use a
different dump valve concept. They say, yeah those little cylinders leak
bad but we don’t care. They dump both high and low pressure to a common
line that returns through the center port in the pump. I have such a
port in my pump and wonder if this would be a safer Free Fall system. He
says the port is directly common to the jug and thus is a more guaranteed dump
to ambient pressure.
BTW, he bought a very
nice little panel mounted valve. The installation is soo much more
professional than our knee knocker under sided Al flox blobbed chunk of
workmanship.
The Berkut guys do
several other little cutes like using Dexron III instead of 5606 and MOV’s on
the pump wires. I wonder sometimes about the shear stickiness of 5606 in
my low pressure switch. Is goo the problem?
Your secret wire with
switch is interesting but perhaps I’d only have it on the down switch.
But, free fall works great. Maybe with a three port dump valve, the
secret wire to override a failed down pressure switch would be excessively
redundant (like extra wings, prop blades, or prop bolts- you only need one,
right?).
Still head
scratch’n,
But at least my
Catto Prop is soon to ship (RPM to follow). Look out Bruce Hammer
J
Larry
Henney
Race
36
252 mph Memphis 100 (wind
enhanced)
PS: And Brent,
if photographing tail wind enhanced groundspeeds is analogous to standing on a
pile of books, why does one arrive earlier as compared to the guy stepping off
the books subsequently being his original height? Flame suit worn out
but ready anyway.