Today's Message Index:
----------------------
1. 07:57 AM - Re: Intermittent Tacho Generator (David Marsh)
2. 08:04 AM - Re: A neat web site. (E R)
3. 08:26 AM - It's not a copy! (Barry Hancock)
4. 11:22 AM - Time to climb (Barry Hancock)
5. 12:30 PM - Fuel feed (Barry Hancock)
6. 01:55 PM - Re: Fuel feed (Ladyrat01@aol.com)
7. 01:55 PM - Re: Time to climb (Ladyrat01@aol.com)
8. 02:13 PM - Re: Re: Intermittent Tacho Generator (Bruce Campbell)
9. 03:41 PM - Re: Re: Intermittent Tacho Generator (David Marsh)
10. 05:44 PM - Re: Re: Intermittent Tacho Generator (Brian Lloyd)
11. 06:13 PM - Re: Re: Intermittent Tacho Generator (Wes Warner)
12. 06:33 PM - Re: Re: Intermittent Tacho Generator (David Marsh)
13. 07:36 PM - Re: Re: Intermittent Tacho Generator (Brian Lloyd)
14. 11:07 PM - Flying Helmets (Walt Murphy)
Message 1
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: David Marsh <swampy@videotron.ca>
Hello Folks.
I'm in need of some armchair engineering. The tacho on my Yak 52 is intermittent.
Sometimes it works flawlessly, other times it only starts working during my
runup, or stops while I'm flying. Both gauges do the same, so it's not a gauge
problem. I've checked the cannon plug and buzzed the wiring ; no apparent broken
wires or faulty grounding. So what do I try next ? Remove the tacho and clean
it ?
Cheers,
Dave.
Message 2
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| Subject: | A neat web site. |
--> Yak-List message posted by: E R <jogggles@yahoo.com>
Hey Ern,
I shot over six hours of raw footage at Eglin, but there is still not enough to
complete a 30-minute video to my satisfaction. What's missing is airplanes (remember
why?) I am coordinating with someone you really, really like right now
to get what I need. Will keep you posted.
Elizabeth
Ernie Martinez <ernest.martinez@oracle.com> wrote:
--> Yak-List message posted by: "Ernie Martinez"
Hey Liz,
I'm still waiting for video of Eglin!!!!
Ernie
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of E R
Subject: Re: Yak-List: A neat web site.
--> Yak-List message posted by: E R
Jim,
Did that DVD I made for you of the Group's Sun n Fun flying turn out ok?
I never had the time to check it before I gave it to you (if so then
I'll put the other footage on a DVD and send it to you; if not, I'll
re-burn the DVD and check it this time!)
Elizabeth
cjpilot710@aol.com wrote:
--> Yak-List message posted by: cjpilot710@aol.com
Troops,
I found a neat web site for those of you who are planning a new
instrument
panels. It's free and easy.
They have Yak-52 blank panels already there and will be putting up CJ-6
instrument panels next week.
After you call up the panel of your choice, you scroll up a bunch of
scaled,
instruments, radios, switches, EFIS, and other stuff, and drag it to a
blank
panel. It will even take you to a link for the instruments or stuff you
pick
out.
http://www.epanelbuilder.com/
And dream on!!!
Jim Goolsby
"They that can give up essential liberty to obtain a little safety,
deserve neither liberty nor safety"
Benjamin Franklin 1759
"With my shield, or on it"
Trojan Warriors BC
"The reason older men are like fine wine. When young, they are like
grapes
until some woman stomps all over them."
Unknown older man.
---------------------------------
==
==
==
==
---------------------------------
Message 3
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| Subject: | It's not a copy! |
--> Yak-List message posted by: Barry Hancock <radialpower@cox.net>
On May 28, 2004, at 11:58 PM, Yak-List Digest Server wrote:
> Yakmeisters.......
> OK, so I'm off of work today with not too much to do but clean out the
> files on my computer when I found the following jewel. Made it up for
> Jim Goolsby some time ago. So I uploaded it and thought I'd share it
> with the list. Here's the link
>
> http://home.earthlink.net/~yak52driver/goolsby/goolsby.html
Jim,
Did you ever send this article out to the magazines? It is a great
read!
Also, could you email me Bushi Cheng's email address off list? Thanks!
B
Barry Hancock
Event Director
All Red Star 2004
(949) 300-5510
www.allredstar.com
"Communism - Lousy Politics, Great Airplanes!"
Message 4
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--> Yak-List message posted by: Barry Hancock <radialpower@cox.net>
Brian wrote:
> Hey Jim, I have flown my 285hp CJ6A to 18,000' when doing
> time-to-climb tests.
> I know it flies higher than 17,061'.
When I get my cabin heat installed (when is a project ever finished?) I
want to do the time-to-climb test in my CJ. For those not familiar I
have the M14P with the MTV-9-260 (read "Big Mutha").
I will say this. Now that I have an american VSI in my airplane, the
claims of the M14P being able to sustain 2500+ fpm are, well, suspect.
I love my engine/prop set up, and it is a night and day difference
between it and the stock performance, but even at my lighter than most
empty weight the CJ does not all of the sudden become a Yak-55 in the
climb. Walter turbine, anyone? It would look odd, but Vne in the dead
vertical would be fun! And between my aux tanks and the 30+ gallon
bladders that Blackwell is installing, you could put nearly 100 gallons
of fuel in the thing! :)
Barry
Message 5
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--> Yak-List message posted by: Barry Hancock <radialpower@cox.net>
Just to clarify, this isn't the warmed over discussion about uneven
fuel feed leading to a fuel imbalance....
I have made many changes to my project, most to make it more
comfortable, convenient, or tricked out bitchin' dude (hey, I *am* from
CA, I have to at least act the part, right?).
One of the convenience changes I made was to add 3-axis electric trim.
I did this because, a) it sure would be nice in those long climbs, and
b) I could trim it up cross-controlled to get rid of the inherent fuel
embalances.
My "aux" tanks are the ones Doug Sapp sells (sold?). They are mounted
in the center section of the wing, so in essence they are secondary
header tanks or greatly expanded fuel lines as the system is gravity
feed. They give me about 34 more gallons and that sure is nice for
cross countries, multiple hop days, and loading up on cheap gas.
Because we re-plumed the entire airplane (and re-wired it too, but
that's for another story) we decided to put in separate vents for the
left and right fuel tanks, instead of going with the original single
vent system as originally designed. At best this would solve the fuel
imbalance problems, at worst it would make them worse and we'd have to
go back to the stock configuration.
Well, I'm not quite sure if it is my impeccable flying skills (well,
OK, I'm sure it's not *that*), the extra tanks, the trim system, or the
separate vents, but my fuel imbalance issue, while not gone, has
certainly been greatly reduced.
I know I'm throwing a piece of raw meat to the wolves, but I thought
some of you might be interested in the info.
DISCLAIMER: The author takes no responsibility for the accuracy of the
information given, nor is this an endorsement to berate, belittle,
defame, or otherwise slander or discredit him or the information
herein. Furthermore, any violation of this disclaimer will be
prosecuted in the court of good taste.
Barry
Message 6
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--> Yak-List message posted by: Ladyrat01@aol.com
GET ME OUTA HERE
Message 7
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| Subject: | Re: Time to climb |
--> Yak-List message posted by: Ladyrat01@aol.com
HOW FICK ARE YOU?
Message 8
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: "Bruce Campbell" <baruch@intelligentflight.com>
Don remove the tach, check the tach generator.
(Old) tachometers work by generating a voltage porportional to the RPM. If
the Tach Generator has an intermittent any where (the candidates are a.
brushes, b. commutators, and c. windings). The good news is they are not
particularly hard to get to, and should be rebuildable.
Bruce Campbell
Yak52
----- Original Message -----
From: "David Marsh" <swampy@videotron.ca>
Subject: Yak-List: Re: Intermittent Tacho Generator
> --> Yak-List message posted by: David Marsh <swampy@videotron.ca>
>
> Hello Folks.
>
> I'm in need of some armchair engineering. The tacho on my Yak 52 is
intermittent. Sometimes it works flawlessly, other times it only starts
working during my runup, or stops while I'm flying. Both gauges do the same,
so it's not a gauge problem. I've checked the cannon plug and buzzed the
wiring ; no apparent broken wires or faulty grounding. So what do I try next
? Remove the tacho and clean it ?
>
> Cheers,
>
> Dave.
>
>
Message 9
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: David Marsh <swampy@videotron.ca>
Agreed ; I meant the tacho generator.
Surely worn brushes would lead to a noisy (wavering) indication, not a
failure for several hours followed by a sudden recovery ?
> --> Yak-List message posted by: "Bruce Campbell"
<baruch@intelligentflight.com>
>
> Don remove the tach, check the tach generator.
> (Old) tachometers work by generating a voltage porportional to the RPM. If
> the Tach Generator has an intermittent any where (the candidates are a.
> brushes, b. commutators, and c. windings). The good news is they are not
> particularly hard to get to, and should be rebuildable.
>
>
> Bruce Campbell
> Yak52
>
Message 10
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
Bruce Campbell wrote:
> --> Yak-List message posted by: "Bruce Campbell" <baruch@intelligentflight.com>
>
> Don remove the tach, check the tach generator.
> (Old) tachometers work by generating a voltage proportional to the RPM. If
> the Tach Generator has an intermittent any where (the candidates are a.
> brushes, b. commutators, and c. windings). The good news is they are not
> particularly hard to get to, and should be rebuildable.
Actually, the tach generator does not work that way. The tach generator is a three-phase
AC generator with a permanent magnet armature and three stator windings
(like an alternator). The frequency is proportional to RPM. (The voltage
increases with RPM to some extent but that is not the important part.) The
three leads carry the three phases. There are no commutator, slip rings, or brushes.
Inside the tach indicator is a three phase AC electric motor that couples to a
standard mechanical tach mechanism. The motor turns at exactly the same RPM as
the generator since the three phases keep the two in exact lock step. It really
is an electrical replacement for the old tach cable. (Never underestimate
the power of the human mind to want to keep doing the same thing over and over
and over ...)
What is probably happening is that you have lost one of the phases so the motor
in the indicator(s) isn't starting reliably. When you turn the engine up to
a higher RPM the voltage in the remaining two phases is sufficient to finally
kick the motor in the tach indicator over and the thing starts working, albeit
on only two of the three phases. Since both indicators do the same thing and
the wiring rings out OK, it is probably the tach generator.
Before you replace the tach generator, carefully clean the cannon jack and plug
at the tach generator. The oils we use do a very good job of keeping the pins
in the tach generator connector from making good contact with the receptacles
in the plug. I tried everything to wash it clean and finally found that the
best solution for getting rid of the oil was avgas. I actually dunk the connector
in a small jar of avgas and let it soak for a bit then clean the receptacle
pins with a pipe cleaner. I use a small toothbrush with avgas to clean the
jack and pins on the tach generator. After doing that my problem went away.
If this does not solve your problem you probably need a new tach generator.
Your mileage may vary.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 11
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| Subject: | Re: Intermittent Tacho Generator |
Mail-Followup-To: Wes Warner <ufo@outerlimits.org>,
--> Yak-List message posted by: Wes Warner <ufo@outerlimits.org>
Dave,
I can tell you that when the tach stops working or runs backwards on
my 55 it's because the wires keep breaking right where they go into the tach
generator. I just solder on new leads and keep going for another 50hrs.
Hopefully I'll get one of those horizon tachs soon.
Wes
On Sat, May 29, 2004 at 10:46:33AM -0400, David Marsh wrote:
> --> Yak-List message posted by: David Marsh <swampy@videotron.ca>
>
> Hello Folks.
>
> I'm in need of some armchair engineering. The tacho on my Yak 52 is
> intermittent. Sometimes it works flawlessly, other times it only starts
> working during my runup, or stops while I'm flying. Both gauges do the
> same, so it's not a gauge problem. I've checked the cannon plug and buzzed
> the wiring ; no apparent broken wires or faulty grounding. So what do I
> try next ? Remove the tacho and clean it ?
>
> Cheers,
>
> Dave.
>
>
>
>
>
>
>
Message 12
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: David Marsh <swampy@videotron.ca>
Brian,
thanks for the advice. The cannon plug certainly has been the problem
before, and cleaning the pins / sockets has worked before, but this time
it's fighting back !!! Just one situation to chew on; if the tach indicator
has sufficient signal from 2 phases to get going and start flying, why would
it lose the will to live 30 mins after I've set 59 % ? Those 2 phases are
still there driving so why would that change ?
And why don't I have something better to do on a Saturday night ?
Wes,
yes, common problem with Yaks ; had that before but this time it's decided
to challenge me with something more subtle.
Thanks to you both,
Dave.
Message 13
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| Subject: | Re: Intermittent Tacho Generator |
--> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
David Marsh wrote:
> --> Yak-List message posted by: David Marsh <swampy@videotron.ca>
>
> Brian,
>
> thanks for the advice. The cannon plug certainly has been the problem
> before, and cleaning the pins / sockets has worked before, but this time
> it's fighting back !!! Just one situation to chew on; if the tach indicator
> has sufficient signal from 2 phases to get going and start flying, why would
> it lose the will to live 30 mins after I've set 59 % ? Those 2 phases are
> still there driving so why would that change ?
Its a technical thing ... its broke.
> And why don't I have something better to do on a Saturday night ?
Hey, why am I sitting here answering these questions? :-)
Actually today was a pretty good day. I took a couple of kids for Young Eagle
rides, I installed some software on my father's computer, I attended a reception
for a number of WW-II vets in DC, and I showed my father how to reprogram the
channels on his TV set. All in all I would say this was one heck of a successful
day.
> Wes,
>
> yes, common problem with Yaks ; had that before but this time it's decided
> to challenge me with something more subtle.
It is time to consider an electronic tach. Less weight, simpler, and more reliable.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 14
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--> Yak-List message posted by: Walt Murphy <waltmurphy@charter.net>
OK, who has a good source for flying helmets at a reasonable price ???
Thanks,
Walt
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