Today's Message Index:
----------------------
1. 05:26 AM - Re: CJ abeam, flap up/down (Richard Romaine)
2. 05:47 AM - CJ Mag Coils - Test data required (Harv)
3. 06:19 AM - Re: CJ Mag Coils - Test data required (George S. Coy)
4. 07:00 AM - Re: CJ Mag Coils - Test data required (Richard Goode)
5. 07:01 AM - Re: CJ Mag Coils - Test data required (Harv)
6. 07:30 AM - Re: Re: CJ Mag Coils - Test data required (George S. Coy)
7. 07:49 AM - Re: Re: CJ Mag Coils - Test data required (Justin Andersen)
8. 08:24 PM - Re: Re: Engine running rough at high power settings? (Roger Kemp)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ abeam, flap up/down |
Bear,
No issues, discussion is one worth having, hope youdidn't eat all the crayo
ns yet...
=C2-
//
=C2-
I agree with everyone that the CJ has the personality ofa chocolate lab, gi
ve it 1500' and it will recover from any attitude/airspeedand want you to d
o it again.=C2- Also agreethe CJ flap really is just a speed brake that b
angs up or down, and energymanagement off the perch with the CJ flap up or
down isn't particularly hard.=C2- My note is, that at least for my airfra
me,it's not quite as forgiving with the flap down and it's worth planting t
he seedfor other folks to think about it.
=C2-
I think the RPA abeam flap recommendation comes from communityexperience in
other airframes where you needed the flap at approach speeds anddidn't wan
t a long duration transition thru your turn or on final. =C2-Me personall
y, I like having the extra margin withthe flap up when I'm close to the gro
und still maneuvering.=C2- If I'm boneheaded enough to tickle the stallin
the base to final that day, I'm probably boneheaded enough to pull rightba
ck into a secondary stall that's more likely with the flap down.=C2- Flap
up it would be a non-event, so I leave theflap alone until pretty much lin
ed up, dump it, accept the pitch change andcontinue.
=C2-
While we have no "mandatory procedures" outsideFARs (or insurance company p
references for having the gear down before landing),and it is strongly reco
mmended to have a CJ experienced instructor, it's stillgood to critique "ac
cepted practices" because sometimes there's roomfor improvement...where I c
ame from our NATOPS was a living breathing collectionof test pilot/engineer
ing and corporate knowledge, often learned from bad events,but hopefully pr
evented by good ideas from the peanut gallery instead.=C2-
=C2-
Cheers,
Rich
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | CJ Mag Coils - Test data required |
Good morning all
I was hoping someone here might have test data for new (or could measure up a new
coil) 'in spec' CJ6 coils?
I've been looking at my stumble issue on the Nanchang and removed both coils from
the mags for bench testing both have been tested at ambient and then slow baked
at 100deg for 60mins (I've no idea how hot they get in flight).
The primary's (thick windings) were tested with a ohm meter setting of 200 and
gave the following:
Left mag at ambient = 00.5 ohm / Right mag at ambient = 00.5 ohm
Left mag at 100deg = 00.8 ohm / Right mag at 100deg = 0.007 ohm
The secondary side (thin windings with terminal sticking out of the core) were
tested with an ohm meter setting of 20k and gave the following:
Left mag at ambient = 9.32 ohm / Right mag at ambient = 9.16 ohm
Left mag at 100deg = 11.96 ohm / Right mag at 100deg = 11.78 ohm
I'm not sure this really identifies anything, resistance increasing with temp as
expected, they both have fairly similar readings at both temp extremes.
One thing I did notice, with the right mag coil connector where the cigarette bears
onto it in situ looks to be quite chaffed and I sometimes struggled to get
a reading off it as if the face isn't conducting too well and it's also a little
looser than the one on the left mag. If the cigarette was to loose momentary
connection at the coil in flight would this contribute to the stumble? (I
can accept the resulting engine shake at the point of the stumble may re-establish
the connection)
Any ideas appreciated
Cheers
Harv
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481085#481085
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | CJ Mag Coils - Test data required |
As I recall, the capacitor is buried in the middle of the coil assembly. The
problem is usually the capacitor, not the windings breaking down.
George Coy
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
Sent: Friday, June 22, 2018 8:47 AM
Subject: Yak-List: CJ Mag Coils - Test data required
Good morning all
I was hoping someone here might have test data for new (or could measure up
a new coil) 'in spec' CJ6 coils?
I've been looking at my stumble issue on the Nanchang and removed both coils
from the mags for bench testing both have been tested at ambient and then
slow baked at 100deg for 60mins (I've no idea how hot they get in flight).
The primary's (thick windings) were tested with a ohm meter setting of 200
and gave the following:
Left mag at ambient = 00.5 ohm / Right mag at ambient = 00.5 ohm
Left mag at 100deg = 00.8 ohm / Right mag at 100deg = 0.007 ohm
The secondary side (thin windings with terminal sticking out of the core)
were tested with an ohm meter setting of 20k and gave the following:
Left mag at ambient = 9.32 ohm / Right mag at ambient = 9.16 ohm
Left mag at 100deg = 11.96 ohm / Right mag at 100deg = 11.78 ohm
I'm not sure this really identifies anything, resistance increasing with
temp as expected, they both have fairly similar readings at both temp
extremes.
One thing I did notice, with the right mag coil connector where the
cigarette bears onto it in situ looks to be quite chaffed and I sometimes
struggled to get a reading off it as if the face isn't conducting too well
and it's also a little looser than the one on the left mag. If the cigarette
was to loose momentary connection at the coil in flight would this
contribute to the stumble? (I can accept the resulting engine shake at the
point of the stumble may re-establish the connection)
Any ideas appreciated
Cheers
Harv
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481085#481085
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | CJ Mag Coils - Test data required |
I agree with George - the problem is almost always the capacitor, and made
worse with heat. That is why the coils typically begin to break down after
20 minutes or so flight when the heat of the engine has soaked through to
the magneto. And of course having the capacitor inside the hot coil of wire
only makes the situation worse.
In England there are a number of companies working with old cars, many of
which have magnetos, and we have been in touch with the best ones to get
their advice. We decided on one particular company, who seemed very
knowledgeable, and for two years now they have been making new coils for us.
Of course they use the old coil former, but with better quality wiring.
However more important is the fact that they use a small Panasonic capacitor
which they bond to the outside of the coil, but in a way that makes no
difference to its installation in the magneto.
I should say that Aerometal, our partner in Hungary, have a high-temperature
test cell with a special test magneto, in which the temperature can be
elevated to well beyond any likely operating temperature. And we have found
that these new coils are very satisfactory, as well as producing a much
better spark and from much lower rpm than original coils.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of George S. Coy
Sent: 22 June 2018 14:09
Subject: RE: Yak-List: CJ Mag Coils - Test data required
As I recall, the capacitor is buried in the middle of the coil assembly. The
problem is usually the capacitor, not the windings breaking down.
George Coy
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
Sent: Friday, June 22, 2018 8:47 AM
Subject: Yak-List: CJ Mag Coils - Test data required
Good morning all
I was hoping someone here might have test data for new (or could measure up
a new coil) 'in spec' CJ6 coils?
I've been looking at my stumble issue on the Nanchang and removed both coils
from the mags for bench testing both have been tested at ambient and then
slow baked at 100deg for 60mins (I've no idea how hot they get in flight).
The primary's (thick windings) were tested with a ohm meter setting of 200
and gave the following:
Left mag at ambient = 00.5 ohm / Right mag at ambient = 00.5 ohm
Left mag at 100deg = 00.8 ohm / Right mag at 100deg = 0.007 ohm
The secondary side (thin windings with terminal sticking out of the core)
were tested with an ohm meter setting of 20k and gave the following:
Left mag at ambient = 9.32 ohm / Right mag at ambient = 9.16 ohm
Left mag at 100deg = 11.96 ohm / Right mag at 100deg = 11.78 ohm
I'm not sure this really identifies anything, resistance increasing with
temp as expected, they both have fairly similar readings at both temp
extremes.
One thing I did notice, with the right mag coil connector where the
cigarette bears onto it in situ looks to be quite chaffed and I sometimes
struggled to get a reading off it as if the face isn't conducting too well
and it's also a little looser than the one on the left mag. If the cigarette
was to loose momentary connection at the coil in flight would this
contribute to the stumble? (I can accept the resulting engine shake at the
point of the stumble may re-establish the connection)
Any ideas appreciated
Cheers
Harv
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481085#481085
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Mag Coils - Test data required |
Thanks George
So lets assume my capacitor breaks down during my oven test at 100 deg, would that
translate into something visible on the ohm meter during my test (for example
open circuit?)
Tia
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481092#481092
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Mag Coils - Test data required |
No, but it would cause timing problems a weaker spark and be very hard on
the points.
George
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
Sent: Friday, June 22, 2018 10:01 AM
Subject: Yak-List: Re: CJ Mag Coils - Test data required
Thanks George
So lets assume my capacitor breaks down during my oven test at 100 deg,
would that translate into something visible on the ohm meter during my test
(for example open circuit?)
Tia
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481092#481092
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Mag Coils - Test data required |
test
> On Jun 22, 2018, at 8:30 AM, George S. Coy <george.coy@gmail.com> wrote:
>
>
> No, but it would cause timing problems a weaker spark and be very hard on
> the points.
> George
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
> Sent: Friday, June 22, 2018 10:01 AM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: CJ Mag Coils - Test data required
>
>
> Thanks George
>
> So lets assume my capacitor breaks down during my oven test at 100 deg,
> would that translate into something visible on the ohm meter during my test
> (for example open circuit?)
>
> Tia
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481092#481092
>
>
>
>
>
>
>
>
>
>
>
>
>
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Engine running rough at high power settings? |
They are not your standard round seals. The problem usually is not the seal itself.
It is usually with engine runs over time the collar nut loosens allowing
the an air leak leaning out the affected cylinder. Each year during my annual
I check them to make sure they are tight.
Doc
Sent from my iPad
> On Jun 19, 2018, at 2:51 PM, apatton2 <apatton@alumni.princeton.edu> wrote:
>
> Re: induction system seals - are those o-ring type seals? I'm unfamiliar with
them. Are the connections between the intake tubes and the case typically suspect,
or is it the tubes and cylinders?
>
> --------
> Andrew Patton
> Yak-50
> San Francisco, CA
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481015#481015
>
>
>
>
>
>
>
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|