Today's Message Index:
----------------------
1. 05:40 AM - Re: Fw: AC voltage at aircraft bus at approx. 1000rpm (FLYaDIVE)
2. 05:44 AM - Re: Fw: AC voltage at aircraft bus at approx. 1000rpm (FLYaDIVE)
3. 07:22 AM - Re: Anouncement (Linn Walters)
4. 11:16 AM - Re: Fw: AC voltage at aircraft bus at approx. 1000rpm (teamgrumman@AOL.COM)
5. 11:22 AM - Re: Anouncement (teamgrumman@AOL.COM)
6. 11:31 AM - Re: Anouncement (flyv35b)
7. 11:31 AM - Re: Anouncement (teamgrumman@AOL.COM)
8. 12:24 PM - Re: Fw: AC voltage at aircraft bus at approx. 1000rpm (FLYaDIVE)
9. 06:37 PM - Re: Anouncement (Gil Alexander)
10. 10:30 PM - Re: Anouncement (Gil Alexander)
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: Fwd: AC voltage at aircraft bus at approx. 1000rpm |
I agree. It should work correctly.
Couldn't you think of a better analogy ... Say ... Like taking a shower with
an raincoat on.
Because if the glove don't fit you must acquit.
Barry
On Thu, Feb 4, 2010 at 10:55 PM, <teamgrumman@aol.com> wrote:
> The whole point is not to patch together something that should work without
> a "FIX." It says right on the alternator and the associated paperwork that
> no noise filter is required.
>
> It's kind of like wearing a glove when you buy a pen that leaks.
>
>
> -----Original Message-----
> From: FLYaDIVE <flyadive@gmail.com>
> To: teamgrumman-list@matronics.com
> Sent: Thu, Feb 4, 2010 2:47 pm
> Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx.
> 1000rpm
>
> Keith & Gary:
>
> Looking at your picture ... In the lower right corner the screen reads 0.2
> V/Div.
> That means between EACH large Tic it is 0.2 V.
> SO ... Your Peak reading is about (again looking at the picture) 0.24 Volts
> and the Peak to Peak (P-P) is 0.28 Volts.
> As for what is acceptable... That may be determined by the manufacture or
> the FAA. I do not know. BUT! When I do a very simple but ACCURATE test
> using a DMM (Digital Multi Meter) I look for 0.4 to 0.5 V AC at the BATTERY
> to determine if a diode is bad.
>
> For the little voltage you are seeing I would put a 0.001 uF Ceramic Cap in
> parallel with a 50,000 uF (or more) Electrolytic Cap and the NEG side of the
> Cap goes to GROUND, POS side to POS Battery
>
> AND/OR - Put a large electrolytic Cap from the 'S' terminal of the VR to
> Ground.
>
> If you have that little noise (0.48 V P-P) the caps will remove it.
>
> Barry
>
>
> On Thu, Feb 4, 2010 at 2:48 PM, <teamgrumman@aol.com> wrote:
>
>> Here is the ripple on a PP alternator. Even with a Zeftronics regulator
>> and a Garmin audio panel, the noise comes through.
>>
>>
>>
>> -----Original Message-----
>> From: Keith Wannamaker <keith@wannamaker.org>
>> To: Gary Vogt <teamgrumman@aol.com>
>> Sent: Thu, Feb 4, 2010 10:51 am
>> Subject: Fwd: AC voltage at aircraft bus at approx. 1000rpm
>>
>> Gary, here is an oscope on my bus with the plane-power. I'm a bit like a
>> hog looking at a wristwatch with the readout. I'm not sure if it is saying
>> 1/2 volt AC top to bottom or 1/8 volt top to bottom. The plane power guy
>> claims that 1/8 volt ac is within spec, but I sent him the picture and am
>> waiting to hear back.
>>
>> Keith
>>
>>
>>
> *
>
> ===================================
> ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
> ===================================
> ttp://forums.matronics.com
> ===================================
> ibution">http://www.matronics.com/contribution
> ===================================
> *
>
> *
>
> *
>
>
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: | Re: Fwd: AC voltage at aircraft bus at approx. 1000rpm |
Gary:
You are correct, the time base should be opened up to define the type of
wave and see if there is a identifiable frequency.
We could start a thread on how to use an O-Scope?
f = 1/T
T- 1/f ...
So 60 Hz would have a time base of 0.01666
Hey! Pretty good picture of the scope and wave form.
Barry
On Thu, Feb 4, 2010 at 11:50 PM, Gil Alexander <gilalex@earthlink.net>wrote:
> Gary,
>
> At 5 mS/div on the scope... could you be seeing some 60 Hz pickup? - which
> would be just over 3 divisions.
>
> Is the noise frequency proportional to RPM?
>
> How long was the ground lead to your probe?
>
> gil A
>
>
> At 08:55 PM 2/4/2010, teamgrumman@aol.com wrote:
>
> The whole point is not to patch together something that should work without
> a "FIX." It says right on the alternator and the associated paperwork that
> no noise filter is required.
>
> It's kind of like wearing a glove when you buy a pen that leaks.
>
>
> -----Original Message-----
> From: FLYaDIVE <flyadive@gmail.com>
> To: teamgrumman-list@matronics.com
> Sent: Thu, Feb 4, 2010 2:47 pm
> Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx.
> 1000rpm
>
> Keith & Gary:
>
> Looking at your picture ... In the lower right corner the screen reads 0.2
> V/Div.
> That means between EACH large Tic it is 0.2 V.
> SO ... Your Peak reading is about (again looking at the picture) 0.24 Volts
> and the Peak to Peak (P-P) is 0.28 Volts.
> As for what is acceptable... That may be determined by the manufacture or
> the FAA. I do not know. BUT! When I do a very simple but ACCURATE test
> using a DMM (Digital Multi Meter) I look for 0.4 to 0.5 V AC at the BATTERY
> to determine if a diode is bad.
>
> For the little voltage you are seeing I would put a 0.001 uF Ceramic Cap in
> parallel with a 50,000 uF (or more) Electrolytic Cap and the NEG side of the
> Cap goes to GROUND, POS side to POS Battery
>
> AND/OR - Put a large electrolytic Cap from the 'S' terminal of the VR to
> Ground.
>
> If you have that little noise (0.48 V P-P) the caps will remove it.
>
> Barry
>
>
> On Thu, Feb 4, 2010 at 2:48 PM, <teamgrumman@aol.com> wrote:
> Here is the ripple on a PP alternator. Even with a Zeftronics regulator
> and a Garmin audio panel, the noise comes through.
>
>
> -----Original Message-----
> From: Keith Wannamaker <keith@wannamaker.org>
> To: Gary Vogt <teamgrumman@aol.com>
> Sent: Thu, Feb 4, 2010 10:51 am
> Subject: Fwd: AC voltage at aircraft bus at approx. 1000rpm
>
> Gary, here is an oscope on my bus with the plane-power. I'm a bit like a
> hog looking at a wristwatch with the readout. I'm not sure if it is saying
> 1/2 volt AC top to bottom or 1/8 volt top to bottom. The plane power guy
> claims that 1/8 volt ac is within spec, but I sent him the picture and am
> waiting to hear back.
>
> Keith
>
>
> ===================================
> ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
> ===================================
> ttp://forums.matronics.com
> ===================================
> ibution">http://www.matronics.com/contribution
> ===================================
>
>
> *
>
> *
>
>
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 |
|
Sent this to the gang so think it's only fair to send it here!
I believe that you can also pick it up at a customs port of entry fully
assembled and save the assembly cost here in the USA.
Linn
923te wrote:
> Grumman Gang,
>
>
>
> MT Propeller has received Supplemental Type Certificate for installing
> their MTV-18-B/183-59b propeller assembly with 2700 RPM controller on
> all models of Grumman Tigers. This STC was initiated through a
> cooperative of 2 Grumman gangers and the MT distributor Jim Ayers
> with Less Drag Products. This STC uses the latest, most efficient blade
> design. Pictures and more information are available at links below.
>
>
>
> The MT propeller is an electrically controlled constant speed prop. It
> has both an automatic mode and a manual mode. In the auto mode you
> simply dial in the desired RPM and the controller will hold that RPM. In
> the manual mode the pilot must hold the RPM thru a momentary switch. It
> works great and really makes a whole new airplane out of the Tiger.
>
>
>
> As an introductory special, we have been able to arrange that the first
> 10 props can be sold at a 10% discount. The current price of the prop is
> $12,480. The discounted price for the first ten purchasers is $11,232.
> The prop is shipped disassembled from Germany to Less Drag Products,
> Inc. in Southern California for $360 so the total cost is $11,592 plus
> freight to you, or you can fly in to Less Drag Products at OXNARD
> airport and fly home faster. This special group purchase price
> ends March 15 and MT is raising prices on April 1, so if you want to go
> faster and climb better, now is the time to do it.
>
>
>
> Website links that you should check out:
>
> http://www.mt-propeller.com/en/entw/stcusa/grumman.htm
>
>
>
> http://www.mt-propeller.com/en/entw/electric.htm
>
>
>
> Here are MT Data and manual links:
>
> http://www.mt-propeller.com/pdf/datsheet/mtv-18.pdf
>
> The Design Limit for the MT prop is 300HP at 2800RPM
>
> Manual:
>
> http://www.mt-propeller.com/pdf/manuals/e-118.pdf
>
>
>
>
>
>
>
> Email me Ned Thomas at 923te@att.net to hold a place in the group purchase.
>
>
>
> Contact Jim Ayers for more details on the prop at 805-795-5377 8am to
> 8pm PST.
>
> *
>
>
> *
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: | Re: Fwd: AC voltage at aircraft bus at approx. |
1000rpm
This was an installation of a new PP alternator and the owner complained
of noise on the first flight after installation. The alternator was remo
ved and the installation inspected, ground to alternator verified. Noise
is still present.
Noise is proportional to rpm. Noise goes away with master off. Even cont
rollers complained of the noise. This noise was not there with the origin
al alternator.
The ground lead was long enough to reach the O-scope.
-----Original Message-----
From: Gil Alexander <gilalex@earthlink.net>
Sent: Thu, Feb 4, 2010 8:50 pm
Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx
. 1000rpm
Gary,
At 5 mS/div on the scope... could you be seeing some 60 Hz pickup? -which
would be just over 3 divisions.
Is the noise frequency proportional to RPM?
How long was the ground lead to your probe?
gil A
At 08:55 PM 2/4/2010, teamgrumman@aol.com wrote:
Thewhole point is not to patch together something that should work without
a"FIX." It says right on the alternator and the associatedpaperwork that
no noise filter is required.
It's kind of like wearing a glove when you buy a pen that leaks.
-----Original Message-----
From: FLYaDIVE <flyadive@gmail.com>
Sent: Thu, Feb 4, 2010 2:47 pm
Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx.1
000rpm
Keith & Gary:
Looking at your picture ... In the lower right corner the screen reads0.2
V/Div.
That means between EACH large Tic it is 0.2 V.
SO ... Your Peak reading is about (again looking at the picture) 0.24Volts
and the Peak to Peak (P-P) is 0.28 Volts.
As for what is acceptable... That may be determined by the manufacture ort
he FAA. I do not know. BUT! When I do a very simplebut ACCURATE test us
ing a DMM (Digital Multi Meter) I look for 0.4 to 0.5V AC at the BATTERY
to determine if a diode is bad.
For the little voltage you are seeing I would put a 0.001 uF Ceramic Capin
parallel with a 50,000 uF (or more) Electrolytic Cap and the NEG sideof
the Cap goes to GROUND, POS side to POS Battery
AND/OR - Put a large electrolytic Cap from the 'S' terminal of the VR toGr
ound.
If you have that little noise (0.48 V P-P) the caps will remove it.
Barry
On Thu, Feb 4, 2010 at 2:48 PM,<teamgrumman@aol.com>wrote:
Here is the ripple on a PP alternator. Even with a Zeftronicsregulator an
d a Garmin audio panel, the noise comes through.
-----Original Message-----
From: Keith Wannamaker<keith@wannamaker.org>
Sent: Thu, Feb 4, 2010 10:51 am
Subject: Fwd: AC voltage at aircraft bus at approx. 1000rpm
Gary, here is an oscope on my bus with the plane-power. I'm abit like a
hog looking at a wristwatch with the readout. I'm notsure if it is sayin
g 1/2 volt AC top to bottom or 1/8 volt top tobottom. The plane power guy
claims that 1/8 volt ac is within spec,but I sent him the picture and am
waiting to hear back.
Keith
========================
===========
ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
========================
===========
ttp://forums.matronics.com
========================
===========
ibution">http://www.matronics.com/contribution
========================
===========
========================
===========
========================
===========
========================
===========
========================
===========
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 |
|
how does it compare to other props, i.e., the Hartzell Scimitar prop.
-----Original Message-----
From: 923te <923te@att.net>
Sent: Thu, Feb 4, 2010 10:00 pm
Subject: TeamGrumman-List: Anouncement
Grumman Gang,
MT Propeller has received Supplemental Type Certificate for installing the
ir MTV-18-B/183-59b propeller assembly with 2700 RPM controller on all mod
els of Grumman Tigers. This STC was initiated through a cooperative of 2
Grumman gangers and the MT distributor Jim Ayers with Less Drag Products.
This STC uses the latest, most efficient blade design. Pictures and more
information are available at links below.
The MT propeller is an electrically controlled constant speed prop. It has
both an automatic mode and a manual mode. In the auto mode you simply dia
l in the desired RPM and the controller will hold that RPM. In the manual
mode the pilot must hold the RPM thru a momentary switch. It works great
and really makes a whole new airplane out of the Tiger.
As an introductory special, we have been able to arrange that the first 10
props can be sold at a 10% discount. The current price of the prop is $12
,480. The discounted price for the first ten purchasers is $11,232. The
prop is shipped disassembled from Germany to Less Drag Products, Inc. in
Southern California for $360 so the total cost is $11,592 plus freight to
you, or you can fly in to Less Drag Products at OXNARD airport and fly ho
me faster. This special group purchase price ends March 15 and MT is rais
ing prices on April 1, so if you want to go faster and climb better, now
is the time to do it.
Website links that you should check out:
http://www.mt-propeller.com/en/entw/stcusa/grumman.htm
http://www.mt-propeller.com/en/entw/electric.htm
Here are MT Data and manual links:
http://www.mt-propeller.com/pdf/datsheet/mtv-18.pdf
The Design Limit for the MT prop is 300HP at 2800RPM
Manual:
http://www.mt-propeller.com/pdf/manuals/e-118.pdf
Email me Ned Thomas at 923te@att.net to hold a place in the group purchase
.
Contact Jim Ayers for more details on the prop at 805-795-5377 8am to 8pm
PST.
========================
===========
========================
===========
========================
===========
========================
===========
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 |
|
With regard to performance or price? Performance is similar I think and
price is considerably more than a Hartzell. When BO gets done
devaluating our dollar the MT prop will cost even more!
Cliff
----- Original Message -----
From: teamgrumman@aol.com
To: teamgrumman-list@matronics.com
Sent: Friday, February 05, 2010 11:18 AM
Subject: Re: TeamGrumman-List: Anouncement
how does it compare to other props, i.e., the Hartzell Scimitar prop.
-----Original Message-----
From: 923te <923te@att.net>
To: teamgrumman-list@matronics.com
Sent: Thu, Feb 4, 2010 10:00 pm
Subject: TeamGrumman-List: Anouncement
Grumman Gang,
MT Propeller has received Supplemental Type Certificate for installing
their MTV-18-B/183-59b propeller assembly with 2700 RPM controller on
all models of Grumman Tigers. This STC was initiated through a
cooperative of 2 Grumman gangers and the MT distributor Jim Ayers with
Less Drag Products. This STC uses the latest, most efficient blade
design. Pictures and more information are available at links below.
The MT propeller is an electrically controlled constant speed prop. It
has both an automatic mode and a manual mode. In the auto mode you
simply dial in the desired RPM and the controller will hold that RPM. In
the manual mode the pilot must hold the RPM thru a momentary switch. It
works great and really makes a whole new airplane out of the Tiger.
As an introductory special, we have been able to arrange that the
first 10 props can be sold at a 10% discount. The current price of the
prop is $12,480. The discounted price for the first ten purchasers is
$11,232. The prop is shipped disassembled from Germany to Less Drag
Products, Inc. in Southern California for $360 so the total cost is
$11,592 plus freight to you, or you can fly in to Less Drag Products at
OXNARD airport and fly home faster. This special group purchase price
ends March 15 and MT is raising prices on April 1, so if you want to go
faster and climb better, now is the time to do it.
Website links that you should check out:
http://www.mt-propeller.com/en/entw/stcusa/grumman.htm
http://www.mt-propeller.com/en/entw/electric.htm
Here are MT Data and manual links:
http://www.mt-propeller.com/pdf/datsheet/mtv-18.pdf
The Design Limit for the MT prop is 300HP at 2800RPM
Manual:
http://www.mt-propeller.com/pdf/manuals/e-118.pdf
Email me Ned Thomas at 923te@att.net to hold a place in the group
purchase.
Contact Jim Ayers for more details on the prop at 805-795-5377 8am to
8pm PST.
ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-Lis
t
ttp://forums.matronics.com
ibution">http://www.matronics.com/contribution
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 |
|
and weight
-----Original Message-----
From: teamgrumman@AOL.COM
Sent: Fri, Feb 5, 2010 11:18 am
Subject: Re: TeamGrumman-List: Anouncement
how does it compare to other props, i.e., the Hartzell Scimitar prop.
-----Original Message-----
From: 923te <923te@att.net>
Sent: Thu, Feb 4, 2010 10:00 pm
Subject: TeamGrumman-List: Anouncement
Grumman Gang,
MT Propeller has received Supplemental Type Certificate for installing the
ir MTV-18-B/183-59b propeller assembly with 2700 RPM controller on all mod
els of Grumman Tigers. This STC was initiated through a cooperative of 2
Grumman gangers and the MT distributor Jim Ayers with Less Drag Products.
This STC uses the latest, most efficient blade design. Pictures and more
information are available at links below.
The MT propeller is an electrically controlled constant speed prop. It has
both an automatic mode and a manual mode. In the auto mode you simply dia
l in the desired RPM and the controller will hold that RPM. In the manual
mode the pilot must hold the RPM thru a momentary switch. It works great
and really makes a whole new airplane out of the Tiger.
As an introductory special, we have been able to arrange that the first 10
props can be sold at a 10% discount. The current price of the prop is $12
,480. The discounted price for the first ten purchasers is $11,232. The
prop is shipped disassembled from Germany to Less Drag Products, Inc. in
Southern California for $360 so the total cost is $11,592 plus freight to
you, or you can fly in to Less Drag Products at OXNARD airport and fly ho
me faster. This special group purchase price ends March 15 and MT is rais
ing prices on April 1, so if you want to go faster and climb better, now
is the time to do it.
Website links that you should check out:
http://www.mt-propeller.com/en/entw/stcusa/grumman.htm
http://www.mt-propeller.com/en/entw/electric.htm
Here are MT Data and manual links:
http://www.mt-propeller.com/pdf/datsheet/mtv-18.pdf
The Design Limit for the MT prop is 300HP at 2800RPM
Manual:
http://www.mt-propeller.com/pdf/manuals/e-118.pdf
Email me Ned Thomas at 923te@att.net to hold a place in the group purchase
.
Contact Jim Ayers for more details on the prop at 805-795-5377 8am to 8pm
PST.
========================
===========
ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
========================
===========
ttp://forums.matronics.com
========================
===========
ibution">http://www.matronics.com/contribution
========================
===========
========================
===========
========================
===========
========================
===========
========================
===========
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: Fwd: AC voltage at aircraft bus at approx. 1000rpm |
Gary:
The noise going away with the Master OFF is normal. With the Master OFF
there is NO voltage being supplied to the Alternator Field, there for NO
output from the Alt.
I am not sure what you are referring to when you say: "The ground lead was
long enough to reach the O-scope." Which ground lead, the scope's?
I would LQQK at the GROUND of the VR. Start by making a SHORT but HEAVY
gage wire with alligator clips to function as a ground and hook it to the VR
and see if the noise diminishes or goes away.
Also check the ENGINE GROUND, the BATTERY GROUND and of course the ALT
GROUND.
Going back to your O-Scope run a shielded or twisted pair of wires to the
scope. Set the scope to monitor a 60 Hz noise and see if the frequency
changes with RPM. If it does there is a HUGE change there is a bad diode or
diode connection in the ALT.
If as you say CONTROLLERS are also hearing the NOISE then the noise is
coming in on the B+ line and reflects back to the two items mentioned above
- GROUND and/or Diode.
Barry
Sent: Thu, Feb 4, 2010 8:50 pm
Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx.
1000rpm
Gary,
>
> At 5 mS/div on the scope... could you be seeing some 60 Hz pickup? - which
> would be just over 3 divisions.
>
> Is the noise frequency proportional to RPM?
>
> How long was the ground lead to your probe?
>
> gil A
>
>
> At 08:55 PM 2/4/2010, teamgrumman@aol.com wrote:
>
> The whole point is not to patch together something that should work without
> a "FIX." It says right on the alternator and the associated paperwork that
> no noise filter is required.
>
> It's kind of like wearing a glove when you buy a pen that leaks.
>
>
> -----Original Message-----
> From: FLYaDIVE <flyadive@gmail.com>
> To: teamgrumman-list@matronics.com
> Sent: Thu, Feb 4, 2010 2:47 pm
> Subject: Re: TeamGrumman-List: Fwd: AC voltage at aircraft bus at approx.
> 1000rpm
>
> Keith & Gary:
>
> Looking at your picture ... In the lower right corner the screen reads 0.2
> V/Div.
> That means between EACH large Tic it is 0.2 V.
> SO ... Your Peak reading is about (again looking at the picture) 0.24 Volts
> and the Peak to Peak (P-P) is 0.28 Volts.
> As for what is acceptable... That may be determined by the manufacture or
> the FAA. I do not know. BUT! When I do a very simple but ACCURATE test
> using a DMM (Digital Multi Meter) I look for 0.4 to 0.5 V AC at the BATTERY
> to determine if a diode is bad.
>
> For the little voltage you are seeing I would put a 0.001 uF Ceramic Cap in
> parallel with a 50,000 uF (or more) Electrolytic Cap and the NEG side of the
> Cap goes to GROUND, POS side to POS Battery
>
> AND/OR - Put a large electrolytic Cap from the 'S' terminal of the VR to
> Ground.
>
> If you have that little noise (0.48 V P-P) the caps will remove it.
>
> Barry
>
>
> On Thu, Feb 4, 2010 at 2:48 PM, <teamgrumman@aol.com> wrote:
> Here is the ripple on a PP alternator. Even with a Zeftronics regulator
> and a Garmin audio panel, the noise comes through.
>
>
> -----Original Message-----
> From: Keith Wannamaker <keith@wannamaker.org>
> To: Gary Vogt <teamgrumman@aol.com>
> Sent: Thu, Feb 4, 2010 10:51 am
> Subject: Fwd: AC voltage at aircraft bus at approx. 1000rpm
>
> Gary, here is an oscope on my bus with the plane-power. I'm a bit like a
> hog looking at a wristwatch with the readout. I'm not sure if it is saying
> 1/2 volt AC top to bottom or 1/8 volt top to bottom. The plane power guy
> claims that 1/8 volt ac is within spec, but I sent him the picture and am
> waiting to hear back.
>
> Keith
>
>
> ===================================
> ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
> ===================================
> ttp://forums.matronics.com
> ===================================
> ibution">http://www.matronics.com/contribution
> ===================================
>
>
> *
>
> ===================================
> ator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
> ===================================
> ttp://forums.matronics.com
> ===================================
> ibution">http://www.matronics.com/contribution
> ===================================
> *
>
> *
>
> *
>
>
Message 9
| 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 |
|
But a full price comparison with a Harzell would have to include a
new spinner and a new certified governor to add onto your O-360-xxx...
$6000 + $500 + $1500 ????
gil A
>With regard to performance or price? Performance is similar I think
>and price is considerably more than a Hartzell. When BO gets done
>devaluating our dollar the MT prop will cost even more!
>
>Cliff
Message 10
| 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 |
|
My Hartzell estimate was a bit low.
Vans Aircraft volume OEM price - to be installed on a RV-X only - is
$6600 for the new blended airfoil O-360 prop.
So, without the Vans discount, a better estimate may be -
$7200 + $500 + $1500 ????
Still less than the MT, but getting closer.
BO is screwing up the $$, but the Euro folks aren't doing too well
either - check the slope of the 4 month graph...:^)
http://www.x-rates.com/d/EUR/USD/graph120.html
gil A
>But a full price comparison with a Harzell would have to include a
>new spinner and a new certified governor to add onto your O-360-xxx...
>
>$6000 + $500 + $1500 ????
>
>gil A
>
>
>>With regard to performance or price? Performance is similar I
>>think and price is considerably more than a Hartzell. When BO gets
>>done devaluating our dollar the MT prop will cost even more!
>>
>>Cliff
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! --
|