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RotaxEngines-List Digest: 2 Msgs - 09/24/18

 
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hgmckay



Joined: 23 May 2006
Posts: 385

PostPosted: Tue Sep 25, 2018 2:15 pm    Post subject: RotaxEngines-List Digest: 2 Msgs - 09/24/18 Reply with quote

John, The working voltage for the Rotax 912 UL electrical system is 12 Volts DC; much less than the 22,000 MF capacitor at 25 Volts as called for on the Rotax engine diagram. How do you explain your statement that the working voltage should not be less than 25Volts?

Hugh G. McKay III, P.E. Fellow. L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
Email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
http://www.geo.com (click on Power Division)
Sent from Mail for Windows 10

From: goodings(at)yorku.ca (goodings(at)yorku.ca)
Sent: Tuesday, September 25, 2018 3:48 PM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: Re: RotaxEngines-List Digest: 2 Msgs - 09/24/18


--> RotaxEngines-List message posted by: goodings(at)yorku.ca

For what it's worth, two 10,000 mF (microfarad) capacitors in parallel = 20,000
mF will be almost as good as one 22,000 mF capacitor. One capacitor > 22,000 mF
will be fine, even better. But be fussy about having the working voltage (for
any electrolytic capacitor) not less than 25 V. All this capacitor is doing is
acting as a "short" to ground for radio frequency noise originating in the
ignition circuit so that the noise does not mess up your radios.

John Goodings, C-FGPJ CH601HD Zodiac



Quoting RotaxEngines-List Digest Server <rotaxengines-list(at)matronics.com>:

Quote:
*

  =========================
    Online Versions of Today's List Digest Archive
  =========================

Today's complete RotaxEngines-List Digest can also be found in either of the
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  =======================
    EMail Version of Today's List Digest Archive
  =======================


            ----------------------------------------------------------
                            RotaxEngines-List Digest Archive
                                       ---
                      Total Messages Posted Mon 09/24/18: 2
            ----------------------------------------------------------


Today's Message Index:
----------------------

      1. 01:22 PM - Capacitors  (Hugh McKay)
      2. 02:11 PM - Re: Capacitors  (John Hauck)



________________________________  Message 1
_____________________________________


Time: 01:22:36 PM PST US
From: Hugh McKay <hgmckay(at)bellsouth.net>
Subject: RotaxEngines-List: Capacitors

On the Rotax 912 UL engine wiring diagram one 22,000 UF capacitor at 25V is
  shown in the circuit. If you cannot find one capacitor of the exact Capaci
tance, can one larger capacitor be used? Can two 10,000 aluminum electrolyt
ic capacitors connected in parallel at that point in the circuit accomplish
  the same thing?

Hugh G. McKay III, P.E. Fellow. L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
Email hgmckay(at)bellsouth.net
http://www.geo.com (click on Power Division)
Sent from Mail for Windows 10


________________________________  Message 2
_____________________________________


Time: 02:11:37 PM PST US
From: "John Hauck" <jhauck(at)elmore.rr.com>
Subject: RE: RotaxEngines-List: Capacitors

EBay has all kinds of 22,000 mf capacitors.  Here are a few with free
shipping.  Super cheap:


https://www.ebay.com/bhp/22000uf-capacitor


John Hauck

Kolb MKIII

Titus, Alabama


From: owner-rotaxengines-list-server(at)matronics.com
[mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Hugh
McKay
Sent: Monday, September 24, 2018 3:22 PM
Subject: RotaxEngines-List: Capacitors


On the Rotax 912 UL engine wiring diagram one 22,000 UF capacitor at 25V
is shown in the circuit. If you cannot find one capacitor of the exact
Capacitance, can one larger capacitor be used? Can two 10,000 aluminum
electrolytic capacitors connected in parallel at that point in the
circuit accomplish the same thing?


Hugh G. McKay III, P.E. Fellow. L.M. ASCE

Senior Consultant

Worldwide Engineering Inc.

4090 North NC Hwy. 16

Denver, NC 28037


Ph. 704-661-8271

Fax 704-483-5466

Email hgmckay(at)bellsouth.net

http://www.geo.com (click on Power Division)

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  for
Windows 10











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