---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/11/20: 11 ---------------------------------------------------------- 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 _____________________________________ Time: 05:56:16 AM PST US Subject: AeroElectric-List: Re: Revmaster 'dual' alterantors From: "dj_theis" 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 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=498312#498312 Attachments: http://forums.matronics.com//files/c29bc5c2_f51d_4e86_8c7c_d7d5a3a18286_175.jpeg ________________________________ Message 2 _____________________________________ Time: 12:27:18 PM PST US Subject: AeroElectric-List: How do you figure C-Rating of a battery? From: "rparigoris" 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 ________________________________ Message 3 _____________________________________ Time: 12:46:37 PM PST US From: Jared Yates Subject: Re: AeroElectric-List: 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 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 > > ________________________________ Message 4 _____________________________________ Time: 01:13:51 PM PST US From: Subject: AeroElectric-List: 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 _____________________________________ Time: 02:31:22 PM PST US From: Jeff Luckey 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.=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 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 _____________________________________ Time: 02:47:01 PM PST US From: Subject: RE: AeroElectric-List: Nav Light CB Rating Thanks Jeffgreatly appreciate the help!!! From: 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 > 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 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= --> /wiki.matronics.com " target="_blank">http://wiki.matronics.com http://www.mat=== ________________________________ Message 7 _____________________________________ Time: 02:55:18 PM PST US From: mike Pienaar Subject: Re: AeroElectric-List: 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 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 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=== > > > ________________________________ Message 8 _____________________________________ Time: 02:58:22 PM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: 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 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 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 - Electric-List" rel="noreferrer" target="_blank">http://www.matronics.co m/Navigator?AeroElectric-List FORUMS - eferrer" target="_blank">http://forums.matronics.com WIKI - errer" target="_blank">http://wiki.matronics.com b Site - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. rel="noreferrer" target="_blank">http://www.matronics.com/contribution ________________________________ Message 9 _____________________________________ Time: 04:55:34 PM PST US Subject: AeroElectric-List: Re: How do you figure C-Rating of a battery? From: "rparigoris" "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. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=498320#498320 ________________________________ Message 10 ____________________________________ Time: 05:32:44 PM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: 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 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. ________________________________ Message 11 ____________________________________ Time: 10:32:28 PM PST US Subject: AeroElectric-List: Management Assignment Help and Writing Service in Australia From: "eillajones309" Searching for Management Assignment Help and Writing Service in Australia? Students can now avail assignment help Australia (https://sourceessay.com/australia/) from SourceEssay essay writers who have ample experience in writing assignments on management. We have a team of highly qualified professional essay writers who write unique assignments for students adhering to the university guidelines. We make sure the assignments are proofread by subject matter experts to ensure they are unique and non-plagiarized before they are handed over to the students. 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