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  Topic: Excessive Amperage
dj_theis

Replies: 16
Views: 1666

PostForum: AeroElectric-List   Posted: Sat Jul 29, 2023 5:46 am   Subject: Re: Excessive Amperage
…….Is anyone else confused by Figures 2, 3 and 5 in the EarthX article that Joe linked above?……..

Yes, at a minimum it’s unclear what they are trying to convey and certainly misleading. ...
  Topic: Starter Circuit: Verner 7U Radial
dj_theis

Replies: 2
Views: 577

PostForum: AeroElectric-List   Posted: Sat Jul 15, 2023 4:23 am   Subject: Re: Starter Circuit: Verner 7U Radial

If the separate contactor is necessary, then please explain:
1. Why?
2. Should it supply all power to the starter -- both motor current and control signal -- or, just the control signal?


I th ...
  Topic: Overvoltage Protection for Rotax 9-Series Engines
dj_theis

Replies: 3
Views: 812

PostForum: AeroElectric-List   Posted: Tue May 23, 2023 10:38 am   Subject: Re: Overvoltage Protection for Rotax 9-Series Engines
Nice design Eric.

In particular, I appreciate your use and reasoning behind switching the AC side of the charge circuit. Reliable switching of higher current DC generally requires relays that are ...
  Topic: AC current reading for Revmaster engine
dj_theis

Replies: 4
Views: 1437

PostForum: AeroElectric-List   Posted: Tue Sep 27, 2022 6:45 pm   Subject: Re: AC current reading for Revmaster engine
BTW . . . I've searched my library for a copy
of the R-2300 installation manual and came up
empty. Can anyone point me to a download link
or email me a copy?

Attached is the "Electrical&qu ...
  Topic: AC current reading for Revmaster engine
dj_theis

Replies: 4
Views: 1437

PostForum: AeroElectric-List   Posted: Tue Sep 27, 2022 6:38 pm   Subject: Re: AC current reading for Revmaster engine
Quote:
Increasing air flow is job 1, wrt cooling this stator. Impregnating the wiring is an improvement that I advocate but do not have data on it. My direct conversation with the stator wire manufac ...
  Topic: Regulator location
dj_theis

Replies: 2
Views: 812

PostForum: AeroElectric-List   Posted: Fri Sep 23, 2022 5:37 am   Subject: Regulator location
I’ve been trading emails with another builder and they asked my thoughts on the location of the ship’s voltage regulator. “What are the pros and cons to mounting the regulator on the occupant s ...
  Topic: AC current reading for Revmaster engine
dj_theis

Replies: 6
Views: 14433

PostForum: AeroElectric-List   Posted: Fri Sep 23, 2022 4:43 am   Subject: Re: AC current reading for Revmaster engine
Checking the DC current after the voltage regulator would not be as indicative since there would be some loss in the regulator and if the regulator is the shunt type DC current would not represent wh ...
  Topic: Battery capacity test
dj_theis

Replies: 16
Views: 4441

PostForum: AeroElectric-List   Posted: Sun Feb 13, 2022 6:18 am   Subject: Re: Battery capacity test
Good question Paul and I believe the short answer is “yes, temperature will affect battery performance.” It’s a common expectation that temperature will impact any chemical reaction rate and ba ...
  Topic: ULPower Alternator/Regulator
dj_theis

Replies: 16
Views: 3925

PostForum: AeroElectric-List   Posted: Fri Dec 24, 2021 6:30 am   Subject: Re: ULPower Alternator/Regulator
What kind of alternator is on the UL350, wound
field or permanent magnet?

From their website, all the UL 350 engines are listed as having integrated PMA charging systems with external R/R. All ...
  Topic: ULPower Alternator/Regulator
dj_theis

Replies: 16
Views: 3925

PostForum: AeroElectric-List   Posted: Fri Dec 24, 2021 6:29 am   Subject: Re: ULPower Alternator/Regulator
What kind of alternator is on the UL350, wound
field or permanent magnet?

From their website, all the UL 350 engines are listed as having integrated PMA charging systems with external R/R. All ...
  Topic: Over Voltage Crowbar
dj_theis

Replies: 10
Views: 3239

PostForum: AeroElectric-List   Posted: Fri Nov 19, 2021 10:50 am   Subject: Re: Over Voltage Crowbar
If nuisance tripping occurs, a capacitor (s) connected between U1 Pin 1 (FB1) and ground might help

Thanks Joe,

I meant to include the data sheet for U1 in my original post and on page 10 (I bel ...
  Topic: Over Voltage Crowbar
dj_theis

Replies: 10
Views: 3239

PostForum: AeroElectric-List   Posted: Fri Nov 19, 2021 10:43 am   Subject: Re: Over Voltage Crowbar
Looking at the 3D rendering image that you posted, I would be worried about the board layout. If the trace under the "R2" and "D1" markings is the only copper carrying trip current ...
  Topic: Over Voltage Crowbar
dj_theis

Replies: 10
Views: 3239

PostForum: AeroElectric-List   Posted: Thu Nov 18, 2021 10:41 am   Subject: Re: Over Voltage Crowbar
What's the maximum alternator size (amp output) that this device can handle?
Cheers! Stu.

HI Stu,
The device does not conduct any charge current from the alternator. So, there is no relationship ...
  Topic: Over Voltage Crowbar
dj_theis

Replies: 10
Views: 3239

PostForum: AeroElectric-List   Posted: Thu Nov 18, 2021 7:19 am   Subject: Re: Over Voltage Crowbar
Looks nice. Are you planning on selling the completed modules? If not, what's a guestimate of component prices?

Thanks Charlie, that means a lot coming from you.

I'd be happy to pass on comple ...
  Topic: Over Voltage Crowbar
dj_theis

Replies: 10
Views: 3239

PostForum: AeroElectric-List   Posted: Wed Nov 17, 2021 7:16 pm   Subject: Over Voltage Crowbar
I've noticed the stand alone overvoltage switches are not as readily available and I asked a friend of mine if he would put together a board using an IC provided by Analog Devices.

https://www.anal ...
  Topic: Dual alternators
dj_theis

Replies: 17
Views: 4682

PostForum: AeroElectric-List   Posted: Thu Jun 17, 2021 4:50 am   Subject: Dual alternators
I have a somewhat academic question regarding design and operation of a dual alternator system. I’ve imagined, but never tested, that running two alternators that are feeding a single battery bus w ...
  Topic: Thread Lacing Tape
dj_theis

Replies: 31
Views: 9379

PostForum: AeroElectric-List   Posted: Tue May 11, 2021 5:12 am   Subject: Re: Thread Lacing Tape
I’ve used a similar product that is a little less refined (no hole die cut in on end to wrap a nearby tube) and found it to be very useful for all sorts of wrapping tasks.

https://www.amazon.com/ ...
  Topic: Thermocouple Accuracy
dj_theis

Replies: 13
Views: 4187

PostForum: AeroElectric-List   Posted: Thu Apr 08, 2021 4:57 am   Subject: Re: Thermocouple Accuracy
I like Charlie’s suggestion of checking other calibration configurations on the MGL.

To respond to Mike’s first question, “is 10 degrees close enough?”
It probably depends on your expect ...
  Topic: Thermocouple Accuracy
dj_theis

Replies: 13
Views: 4187

PostForum: AeroElectric-List   Posted: Sun Apr 04, 2021 5:22 am   Subject: Re: Thermocouple Accuracy
Mike,

Maybe this link will offer a few ideas to help trouble shoot.

https://blog.wika.us/products/temperature-products/six-common-causes-thermocouple-temperature-measurement-errors/

The ice b ...
  Topic: Revmaster R2300 Ignition
dj_theis

Replies: 10
Views: 7648

PostForum: AeroElectric-List   Posted: Mon Feb 15, 2021 8:15 am   Subject: Re: Revmaster R2300 Ignition
I just found this old thread. Got to researching the topic as I've a R-2300 that is currently being built. After looking this all over, here is what I'm thinking. Do you see any issues with doing it ...
 
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