28 Apr 2024, 05:10 [ UTC - 5; DST ]
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Post subject: Re: You say you want an Evolution ... Posted: 29 Oct 2023, 18:01 |
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Joined: 06/17/14 Posts: 5037 Post Likes: +1956 Location: KJYO
Aircraft: C-182, GA-7
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Years ago there was an article from an aerobatics instructor flying - eat Bananas before aerobatics. They have carbs and taste nearly the same coming up as they do going down.
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Post subject: Re: You say you want an Evolution ... Posted: 16 Nov 2023, 08:06 |
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Joined: 03/01/14 Posts: 2154 Post Likes: +1653 Location: 0TX0 Granbury TX
Aircraft: T-210M Aeronca 7AC
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N!ce. Are you making friends with that new ride?
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Post subject: Re: You say you want an Evolution ... Posted: 19 Nov 2023, 03:32 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: N!ce. Are you making friends with that new ride? Oh my yes! I've got about a hundred hours in it now, and at my annual recurrent training last month the CFI really had to pile it on to push me out of my comfort zone. I've gone from feeling like I have a tiger by the tail to feeling like a horse and rider as one. It still leaves me grinning with every flight.
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Post subject: Re: You say you want an Evolution ... Posted: 20 Apr 2024, 01:40 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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OK, this is just funny. Attachment: IMG_20230719_181411539.jpg As mentioned on another thread, instead of conventional lead-acid for the Evo's 2 ship's batteries we used lithium batteries from EarthX. A problem was that output from the 250-amp generator, split between the two batteries, would have been more than the EarthX batteries would accept, so the easiest solution was just to double up to 4 batteries, each seeing 1/4 of the generator's output. That's still lighter than the lead-acids they replaced, and gives us plenty of back-up battery. "Plenty" may be an understatement. Recently, in testing the "Emergency Load Shed" button on the touchscreen, which cuts non-essential power draws to maximize battery power after a generator failure, we left it on to see how long it actually took to drain the batteries. To prevent damage to the batteries, EarthX says their circuitry will cut them off when they drop to approximately 22v. We didn't wait that long, we stopped when they hit 23.6v, which took ... over 8 1/2 hours!!! Plenty, indeed! And the G3X and GTN have their own, separate, stand-by batteries which lasted another almost 2 hours. We'll probably add some "nice to have" items to the "Load Shed" button's list of essentials.
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Post subject: Re: You say you want an Evolution ... Posted: 20 Apr 2024, 11:37 |
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Joined: 04/19/19 Posts: 563 Post Likes: +150 Location: Benton AR KSUZ
Aircraft: Baron B55 Pll
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Nice! I want one of these bad but I’m afraid of stepping into the turbo prop world even though it would be perfect for my mission. Very nice plane!
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Post subject: Re: You say you want an Evolution ... Posted: 22 Apr 2024, 16:23 |
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Joined: 10/05/11 Posts: 9586 Post Likes: +6461 Company: Power/mation Location: Milwaukee, WI (KMKE)
Aircraft: 1963 Debonair B33
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Username Protected wrote: OK, this is just funny. Attachment: IMG_20230719_181411539.jpg As mentioned on another thread, instead of conventional lead-acid for the Evo's 2 ship's batteries we used lithium batteries from EarthX. A problem was that output from the 250-amp generator, split between the two batteries, would have been more than the EarthX batteries would accept, so the easiest solution was just to double up to 4 batteries, each seeing 1/4 of the generator's output. That's still lighter than the lead-acids they replaced, and gives us plenty of back-up battery. "Plenty" may be an understatement. Recently, in testing the "Emergency Load Shed" button on the touchscreen, which cuts non-essential power draws to maximize battery power after a generator failure, we left it on to see how long it actually took to drain the batteries. To prevent damage to the batteries, EarthX says their circuitry will cut them off when they drop to approximately 22v. We didn't wait that long, we stopped when they hit 23.6v, which took ... over 8 1/2 hours!!! Plenty, indeed! And the G3X and GTN have their own, separate, stand-by batteries which lasted another almost 2 hours. We'll probably add some "nice to have" items to the "Load Shed" button's list of essentials. Yes, that is funny. I'd say you have some headroom to work with there! I assume you have freon AC? If so, is the compressor run from the engine or from an electric motor? If by an electric motor, it would be interesting to see how long you can "ground cool" before you jeopardize your power available for starting.
_________________ Be Nice
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 02:01 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: I assume you have freon AC? If so, is the compressor run from the engine or from an electric motor? In my plane, the AC compressor is run from the engine, as on most Evos. A few have electric AC, especially in the South where being able to ground cool before engine start is especially attractive, but I didn't want the effect on CG.
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 02:47 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: What if you lose a battery cell in normal ops? What protects the system from sending too much current to the remaining batteries from the generator? A single bad cell is handled by the EarthX BMS, you'd have to ask them for the details. If a whole battery goes down, the 3 remaining batteries could handle 240 amps together, which is more than they would ever see, since normal system load is 30-40 amps. Even if they were somehow totally exhausted at startup, the starter/generator controller (SGC) ramps up the generator slowly so their resistance would increase gradually over several minutes before the SGC made full current available. The SGC is also the voltage regulator. In any case, the BMS will protect the batteries from damage.
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 11:44 |
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Joined: 03/17/08 Posts: 6081 Post Likes: +12527 Location: KMCW
Aircraft: B55 PII,F-1,L-2,OTW,
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I need to block this thread... I want one of these sooooo baaaad!!!!!
_________________ Tailwinds, Doug Rozendaal MCW Be Nice, Kind, I don't care, be something, just don't be a jerk ;-)
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 17:27 |
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Joined: 12/10/07 Posts: 30849 Post Likes: +10798 Location: Minneapolis, MN (KFCM)
Aircraft: 1970 Baron B55
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Username Protected wrote: What if you lose a battery cell in normal ops? What protects the system from sending too much current to the remaining batteries from the generator? A single bad cell is handled by the EarthX BMS, you'd have to ask them for the details. If a whole battery goes down, the 3 remaining batteries could handle 240 amps together, which is more than they would ever see, since normal system load is 30-40 amps. Even if they were somehow totally exhausted at startup, the starter/generator controller (SGC) ramps up the generator slowly so their resistance would increase gradually over several minutes before the SGC made full current available. The SGC is also the voltage regulator. In any case, the BMS will protect the batteries from damage. Don't you have four 13v batteries with two pairs in series and the pairs in parallel?
If so when a single battery goes offline, it will effectively disconnect both in the pair leaving you with one pair needing to handle the full generator output. Hopefully as long as that happens after the starting energy has been replenished the charging current would be low but if one battery tripped offline within a few minutes of starting the engines you might have a problem.
IIRC these batteries respond to excess charging current by disconnecting to protect the battery (and prevent a fire/explosion) so that probably wouldn't hurt the battery but it could leave you with no battery in flight.
Or do you have four 26v batteries, all in parallel?
_________________ -lance
It's easier to fool people than to convince them that they have been fooled.
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 19:26 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: Or do you have four 26v batteries, all in parallel? This. They pair up in series for 52v starts, then it's back to all parallel.
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Post subject: Re: You say you want an Evolution ... Posted: 24 Apr 2024, 22:07 |
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Joined: 12/07/17 Posts: 7043 Post Likes: +5807 Company: Malco Power Design Location: KLVJ
Aircraft: 1976 Baron 58
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Username Protected wrote: Or do you have four 26v batteries, all in parallel? This. They pair up in series for 52v starts, then it's back to all parallel.
So how does all the avionics stay live during a start? Some converter running all of it or is it all able to take 48V? I’d give a pretty to see a detailed electrical schematic.
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