Today's Message Index:
----------------------
1. 05:56 AM - Re: Revmaster 'dual' alterantors (dj_theis)
2. 12:27 PM - How do you figure C-Rating of a battery? (rparigoris)
3. 12:46 PM - Re: How do you figure C-Rating of a battery? (Jared Yates)
4. 01:13 PM - Nav Light CB Rating ()
5. 02:31 PM - Re: Nav Light CB Rating (Jeff Luckey)
6. 02:47 PM - Re: Nav Light CB Rating ()
7. 02:55 PM - Re: Nav Light CB Rating (mike Pienaar)
8. 02:58 PM - Re: How do you figure C-Rating of a battery? (Jeff Luckey)
9. 04:55 PM - Re: How do you figure C-Rating of a battery? (rparigoris)
10. 05:32 PM - Re: Re: How do you figure C-Rating of a battery? (Jeff Luckey)
11. 10:32 PM - Management Assignment Help and Writing Service in Australia (eillajones309)
Message 1
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| Subject: | Re: Revmaster 'dual' alterantors |
N509RV(at)eckenroth.com wrote:
> Dan
>
> I'll try andget a picture of that casting for you.
>
>
> Paul
>
>
Thanks Paul,
I was able to get an image (attached) of the outside of the casting. With 5e CDI
casting removed, does it appear that there is an air flow path that would help
ventilate the PMA coils?
I am imagining having a fitting to feed air from the top of the engine on one side
(shown in the photo) and allow the exit air on the other side of the casting
to exit into the lower engine area.
Dan
--------
Scratch building Sonex #1362
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| Subject: | How do you figure C-Rating of a battery? |
Hi Group I'm a bit confused how to figure C-rating of a battery. Here's my dilemma,
here's a 5,000mA battery that say's it's good for 10C continuous and 15C
burst: https://hobbyking.com/en_us/turnigy-sub-c-1-2v-5000mah-high-power-series-nimh-single-cell.html?queryID=3ed79812e155e159b8e96c63dba8378a&objectID=41335&indexName=hbk_live_magento_en_us_products
Initial thoughts is just multiply 5 times 10 or 15. Then I read a review and the
battery never made it to 5amp capacity and the capacity goes down the more amps
you draw from it. Here's the review: https://lygte-info.dk/review/batteries2012/Turnigy%20Sub-C%205000mAh%20(Gray)%20UK.html
If I wanted to know what the continuous C rating is for this battery, would you
take the unrealistic too high 5aH capacity rating from the Mfg times 10? Take
the ~3.5 20 amp discharge capacity rating from the review times 10? Or??
Now for another hard question, how would you figure out burst amp rating? Thx.
Ron P.
Read this topic online here:
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| Subject: | Re: How do you figure C-Rating of a battery? |
Multiply 5000 by 10 for continuous, which is 50,000 milliamps, or 50 amps.
On Fri, Sep 11, 2020 at 3:38 PM rparigoris <rparigor@hotmail.com> wrote:
> rparigor@hotmail.com>
>
> Hi Group I'm a bit confused how to figure C-rating of a battery. Here's my
> dilemma, here's a 5,000mA battery that say's it's good for 10C continuous
> and 15C burst:
> https://hobbyking.com/en_us/turnigy-sub-c-1-2v-5000mah-high-power-series-nimh-single-cell.html?queryID=3ed79812e155e159b8e96c63dba8378a&objectID=41335&indexName=hbk_live_magento_en_us_products
> Initial thoughts is just multiply 5 times 10 or 15. Then I read a review
> and the battery never made it to 5amp capacity and the capacity goes down
> the more amps you draw from it. Here's the review:
> https://lygte-info.dk/review/batteries2012/Turnigy%20Sub-C%205000mAh%20(Gray)%20UK.html
> If I wanted to know what the continuous C rating is for this battery,
> would you take the unrealistic too high 5aH capacity rating from the Mfg
> times 10? Take the ~3.5 20 amp discharge capacity rating from the review
> times 10? Or??
> Now for another hard question, how would you figure out burst amp rating?
> Thx. Ron P.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498313#498313
>
>
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| Subject: | Nav Light CB Rating |
What is the suggested CB rating of a navigation light circuit on a 14 VDC
system?
The airplane is fiberglass so the Nav light circuit is 53 feet from the CB
to the switch to the Nav light fixture and back to the forest of grounds and
it is wired with 18 AWG wire? My current system has a 5 AMP CB that
services only the two navigation light bulb fixtures that each has two bulbs
(total of 4 incandescent light bulbs).
I do not know the manufacturer of the light fixture so I do not have any
idea what these light bulbs draw. It was suggested that I install a 5 AMP
CB and when I turn on the switch the lights all illuminate and they stay on
for about 20 minutes and then the CB pops. On hotter days the time before
the CB pops is more like 10 minutes so it seems that the thermal load on the
current 5 AMP CB is too great. Of course I can upgrade the CB but I would
prefer to know if a 7 AMP or 10 amp is preferred so that is why I am
reaching out to the experts on the subject.
As always THANKS for your help!!!.
Message 5
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| Subject: | Re: Nav Light CB Rating |
Bill,
If you get the numbers from those bulbs you can look them up and find their
current rating.=C2- That way you know for sure what you've got.
But #18 wire is fine at 10 amps, so just upgrade to a 10 amp breaker and ca
ll it good.
Remember, the CB is there to protect the wire not the load.
-Jeff On Friday, September 11, 2020, 01:25:16 PM PDT, billhuntersemail@g
mail.com <billhuntersemail@gmail.com> wrote:
What is the suggested CB rating of a navigation light circuit on a 14 VDC
system?
The airplane is fiberglass so the Nav light circuit is 53 feet from the CB
to the switch to the Nav light fixture and back to the forest of grounds an
d
it is wired with 18 AWG wire?=C2- My current system has a 5 AMP CB that
services only the two navigation light bulb fixtures that each has two bulb
s
(total of 4 incandescent light bulbs).
I do not know the manufacturer of the light fixture so I do not have any
idea what these light bulbs draw.=C2- It was suggested that I install a 5
AMP
CB and when I turn on the switch the lights all illuminate and they stay on
for about 20 minutes and then the CB pops.=C2- On hotter days the time be
fore
the CB pops is more like 10 minutes so it seems that the thermal load on th
e
current 5 AMP CB is too great.=C2- Of course I can upgrade the CB but I w
ould
prefer to know if a 7 AMP or 10 amp is preferred so that is why I am
reaching out to the experts on the subject.
As always THANKS for your help!!!.
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 6
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| Subject: | Nav Light CB Rating |
Thanks Jeffgreatly appreciate the help!!!
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of Jeff Luckey
Sent: Friday, September 11, 2020 2:25 PM
Subject: Re: AeroElectric-List: Nav Light CB Rating
Bill,
If you get the numbers from those bulbs you can look them up and find
their current rating. That way you know for sure what you've got.
But #18 wire is fine at 10 amps, so just upgrade to a 10 amp breaker and
call it good.
Remember, the CB is there to protect the wire not the load.
-Jeff
On Friday, September 11, 2020, 01:25:16 PM PDT,
billhuntersemail@gmail.com <mailto:billhuntersemail@gmail.com>
<billhuntersemail@gmail.com <mailto:billhuntersemail@gmail.com> > wrote:
<mailto:billhuntersemail@gmail.com> >
What is the suggested CB rating of a navigation light circuit on a 14
VDC
system?
The airplane is fiberglass so the Nav light circuit is 53 feet from the
CB
to the switch to the Nav light fixture and back to the forest of grounds
and
it is wired with 18 AWG wire? My current system has a 5 AMP CB that
services only the two navigation light bulb fixtures that each has two
bulbs
(total of 4 incandescent light bulbs).
I do not know the manufacturer of the light fixture so I do not have any
idea what these light bulbs draw. It was suggested that I install a 5
AMP
CB and when I turn on the switch the lights all illuminate and they stay
on
for about 20 minutes and then the CB pops. On hotter days the time
before
the CB pops is more like 10 minutes so it seems that the thermal load on
the
current 5 AMP CB is too great. Of course I can upgrade the CB but I
would
prefer to know if a 7 AMP or 10 amp is preferred so that is why I am
reaching out to the experts on the subject.
As always THANKS for your help!!!.
_/Navigator?AeroElectric-List"
target="_blank">http://www.matronics.com/Na= -
MATRONICS WEB FORUMS= --> <http://forums.matronics.com>
/wiki.matronics.com <http://forums.matronics.com> "
target="_blank">http://wiki.matronics.com
http://www.mat===
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| Subject: | Re: Nav Light CB Rating |
I have Whelen position lights and current draw is 7.5 amp
Sent from my iPhone
> On Sep 11, 2020, at 2:38 PM, Jeff Luckey <jluckey@pacbell.net> wrote:
>
> =EF=BB
>
> Bill,
>
> If you get the numbers from those bulbs you can look them up and find thei
r current rating. That way you know for sure what you've got.
>
> But #18 wire is fine at 10 amps, so just upgrade to a 10 amp breaker and c
all it good.
>
> Remember, the CB is there to protect the wire not the load.
>
>
> -Jeff
> On Friday, September 11, 2020, 01:25:16 PM PDT, billhuntersemail@gmail.com
<billhuntersemail@gmail.com> wrote:
>
>
>
> What is the suggested CB rating of a navigation light circuit on a 14 VDC
> system?
>
> The airplane is fiberglass so the Nav light circuit is 53 feet from the CB
> to the switch to the Nav light fixture and back to the forest of grounds a
nd
> it is wired with 18 AWG wire? My current system has a 5 AMP CB that
> services only the two navigation light bulb fixtures that each has two bul
bs
> (total of 4 incandescent light bulbs).
>
> I do not know the manufacturer of the light fixture so I do not have any
> idea what these light bulbs draw. It was suggested that I install a 5 AMP
> CB and when I turn on the switch the lights all illuminate and they stay o
n
> for about 20 minutes and then the CB pops. On hotter days the time before
> the CB pops is more like 10 minutes so it seems that the thermal load on t
he
> current 5 AMP CB is too great. Of course I can upgrade the CB but I would
> prefer to know if a 7 AMP or 10 amp is preferred so that is why I am
> reaching out to the experts on the subject.
>
> As always THANKS for your help!!!.
> _/Navigator?AeroElectric-List" target="_blank">http://www.matronics.com/
Na= - MATRONICS WEB FORUMS= -->
> /wiki.matronics.com" target="_blank">http://wiki.matronics.com
> http://www.mat===
>
>
>
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| Subject: | Re: How do you figure C-Rating of a battery? |
Ron,
The Amp Hour rating for a battery is kind of a theoretical number.=C2- In
theory, a 5 Ah rating should deliver 5 amps for one hour but real batterie
s rarely, if ever, do.=C2- It is more likely to deliver 1 A for 5 hours.
=C2-=C2-
Theoretically:=C2- Ah = Time (in hours) x Amps
That is a linear equation, but as the current drain increases the length of
time decreases in a non-linear fashion.
Those 10C & 15C ratings are typical for batteries used in model aircraft &
cars and are usually a little optimistic.
The 10C rating is telling you that the battery supposedly has enough "grunt
" to deliver 50 amps, but only for a very short period of time, like a minu
te or two, if that.=C2- A lesser battery could not deliver 50 A at all, a
nd if you tried to pull that kind of current, the battery voltage would dro
p-off precipitously.
I fly electric R/C airplanes using Li-po batteries (as opposed to the nicke
l-metal batts you are referring to) and they can deliver 20C+.=C2- That m
eans, for a 2 Ah battery, it can deliver up to 40 amps in short bursts, lik
e when doing a full-throttle climb for 5-10 seconds.=C2- But the typical
total flight time for RC airplanes is less than 10 minutes.=C2- We pull a
lot of power for a short (no pun intended) duration.
I'm not sure that answers you questions, but may give you some context.
If we knew more about you application, we might be able to provide more use
ful information.
-Jeff
On Friday, September 11, 2020, 01:02:07 PM PDT, Jared Yates <email@jare
dyates.com> wrote:
Multiply 5000 by 10 for continuous, which is 50,000 milliamps, or 50 amps.
On Fri, Sep 11, 2020 at 3:38 PM rparigoris <rparigor@hotmail.com> wrote:
>
Hi Group I'm a bit confused how to figure C-rating of a battery. Here's my
dilemma, here's a 5,000mA battery that say's it's good for 10C continuous a
nd 15C burst: https://hobbyking.com/en_us/turnigy-sub-c-1-2v-5000mah-high-p
ower-series-nimh-single-cell.html?queryID=3ed79812e155e159b8e96c63dba8378
a&objectID=41335&indexName=hbk_live_magento_en_us_products
Initial thoughts is just multiply 5 times 10 or 15. Then I read a review an
d the battery never made it to 5amp capacity and the capacity goes down the
more amps you draw from it. Here's the review: https://lygte-info.dk/revie
w/batteries2012/Turnigy%20Sub-C%205000mAh%20(Gray)%20UK.html
If I wanted to know what the continuous C rating is for this battery, would
you take the unrealistic too high 5aH capacity rating from the Mfg times 1
0? Take the ~3.5 20 amp discharge capacity rating from the review times 10?
Or??
Now for another hard question, how would you figure out burst amp rating? T
hx. Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498313#498313
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Electric-List" rel="noreferrer" target="_blank">http://www.matronics.co
m/Navigator?AeroElectric-List
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
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errer" target="_blank">http://wiki.matronics.com
b Site -
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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| Subject: | Re: How do you figure C-Rating of a battery? |
"If we knew more about you application, we might be able to provide more useful
information." I have a Europa XS with both long and short wings powered by a
Rotax 914. Although true if you have enough altitude you can put the prop in course
pitch and air start, but with a cold engine it's hard on the engine and
you need enough altitude and a good place to land if restart is unsuccessful to
do it safety. Gettin a battery cold soaked can hurt performance for inflight
restart or in the middle of nowhere ground start.
I too was an electric model guy 15 years ago when the hottest sub C cell was a GP 2200mA. http://www.europaowners.org/main.php?g2_itemId=27335 I made up a pack that I could wire direct to fuel pump 2 to keep at least 1 fuel pump running if all else failed. So my initial mission was to just run a 2 amp fuel pump with a total loss battery. Since sub C NiMh batteries have been growing in capacity and ability to dump amps I was thinking I could use it for double duty as a jump pack for ships battery in a pinch. I will be using a Earth-X 680. My concern is when connecting NiMh pack to a 680 that is low on charge amperage draw between the 2 could be quite high. Ron P.
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| Subject: | Re: How do you figure C-Rating of a battery? |
... so you are looking for some kind of power source to start your Rotax i
n an emergency?=C2- Is that correct?
The issue of batteries of different type charging each other would be a fun
ction of the difference in voltage between them.=C2- I don't know anythin
g about EarthX batts but since you would be building you own pack from indi
vidual NiMh cells, you could build a pack that is close in voltage to the E
arthX, maybe?
There is also the possibility of isolating the EarthX batt from the NiMh ba
ttery using diodes.
I'm not sure but, I think it would take a bunch of NiMh batts to make a pac
k with enough power to crank an engine.
I believe that the EarthX are lithium based batteries (again, don't know mu
ch about them) but that battery chemistry has very high energy density.=C2
- Much higher than NiMh, so if you're looking for some kind of backup bat
tery, you're probably better off with the lithium-based batts and their hig
her energy density and lower weight.
-Jeff
On Friday, September 11, 2020, 05:06:43 PM PDT, rparigoris <rparigor@ho
tmail.com> wrote:
m>
"If we knew more about you application, we might be able to provide more us
eful information." I have a Europa XS with both long and short wings powere
d by a Rotax 914. Although true if you have enough altitude you can put the
prop in course pitch and air start, but with a cold engine it's hard on th
e engine and you need enough altitude and a good place to land if restart i
s unsuccessful to do it safety. Gettin a battery cold soaked can hurt perfo
rmance for inflight restart or in the middle of nowhere ground start.
I too was an electric model guy 15 years ago when the hottest sub C cell wa
s a GP 2200mA. http://www.europaowners.org/main.php?g2_itemId=27335 I mad
e up a pack that I could wire direct to fuel pump 2 to keep at least 1 fuel
pump running if all else failed. So my initial mission was to just run a 2
amp fuel pump with a total loss battery. Since sub C NiMh batteries have b
een growing in capacity and ability to dump amps I was thinking I could use
it for double duty as a jump pack for ships battery in a pinch. I will be
using a Earth-X 680. My concern is when connecting NiMh pack to a 680 that
is low on charge amperage draw between the 2 could be quite high. Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498320#498320
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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