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carl.froehlich(at)verizon
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 Posted: Sun Sep 15, 2013 6:55 am Post subject: B and C pad mounted alternator |
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As already pointed out an alternator belt tends to last a long time if not
misaligned. If you have reason to pull the prop however, replacing the belt
is always an easy preventative maintenance step. The standard 60amp
alternator (B&C or Plane Power) is easily replaced without pulling the prop.
WRT only running the little 20 amp pad alternator, I suggest you are trading
good for not as good:
- you will be limited to a day VFR aircraft
- no margin at all to charge the battery(s) after engine start
- the little alternator always running full blast
- the only B&C alternator failure I've seen was one of these pad units - the
breakable coupling broke.
- any auto part store will provide an acceptable alternator if you get stuck
someplace (assuming you are using an internally regulated alternator like
the Plane Power unit). The little B&C pad alternator is a "send it via
FedEx" process.
On the larger picture, the alternator is not the most reliable element in an
electrical power distribution system, it is the battery. This assumes you
don't design in a single point failure such as a single battery (or two
batteries always in parallel), single master relay, a single ground
connection, single avionics master switch, or similar. Adding an extra
alternator (if that is your direction) protects only from the primary
alternator failing. Having a robust battery power distribution with a
single alternator and adequate battery amp/hr capacity, I offer, is better
risk mitigation.
Carl
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flysrv10(at)gmail.com
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| Posted: Sun Sep 15, 2013 9:07 am Post subject: B and C pad mounted alternator |
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Thanks Carl. Your points are well taken.
You guys are saving me about 41200 box.
Do not archive.
On Sep 15, 2013, at 10:54 AM, "Carl Froehlich" <carl.froehlich(at)verizon.net> wrote:
[quote]
As already pointed out an alternator belt tends to last a long time if not
misaligned. If you have reason to pull the prop however, replacing the belt
is always an easy preventative maintenance step. The standard 60amp
alternator (B&C or Plane Power) is easily replaced without pulling the prop.
WRT only running the little 20 amp pad alternator, I suggest you are trading
good for not as good:
- you will be limited to a day VFR aircraft
- no margin at all to charge the battery(s) after engine start
- the little alternator always running full blast
- the only B&C alternator failure I've seen was one of these pad units - the
breakable coupling broke.
- any auto part store will provide an acceptable alternator if you get stuck
someplace (assuming you are using an internally regulated alternator like
the Plane Power unit). The little B&C pad alternator is a "send it via
FedEx" process.
On the larger picture, the alternator is not the most reliable element in an
electrical power distribution system, it is the battery. This assumes you
don't design in a single point failure such as a single battery (or two
batteries always in parallel), single master relay, a single ground
connection, single avionics master switch, or similar. Adding an extra
alternator (if that is your direction) protects only from the primary
alternator failing. Having a robust battery power distribution with a
single alternator and adequate battery amp/hr capacity, I offer, is better
risk mitigation.
Carl
--
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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