Today's Message Index:
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1. 08:16 AM - Re: Which 55-60 amp alternator (Robert L. Nuckolls, III)
2. 07:08 PM - Re: Which 55-60 amp alternator (B Tomm)
Message 1
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| Subject: | Re: Which 55-60 amp alternator |
At 01:23 PM 8/13/2012, you wrote:
Bob,
Assuming that in order to end up with an externally regulated 55-60 amp
alternator, I will probably have to modify an IR model, which alternator
should I buy to start with.
I'm not sufficiently familiar with the
choices to advise you confidently. It would
seem that the driving constraint is purely
mechanical. Research the parts available to bolt
it to the engine including any changes to
the stock pulley.
Unless you're willing to tackle mechanical
integration issues along with electrical, you'd
probably want to limit you search to frames
already supported by off-the-shelf attach
hardware.
I want the fans to turn the correct direction (CCW when viewed at the
pulley) for use on a lycoming.
That used to be a 'thing' to consider with
external fans with blades optimized for direction
of rotation.
[]
Modern alternators have internal fans with
little if any 'sculpturing' of the blades
[]
Rotating an alternator 'backwards' in an
airplane is unlikely to pose any problems.
First, you're exceedingly unlikely to stress
your alternator in a manner that produces
maximum rated internal heating. The cooling
environment under the hood of a car is MUCH
worse than under the cowl of your airplane.
Further, you're going to be spinning the
alternator much faster than the original
application design point . . . cooling is
not a big issue.
I don't want to pay the big bucks for a B&C unit and don't mind doing the
work to convert it.
You can run it internally regulated . . . you
could do a mod similar to that offered by Plane
Power for crowbar ov protection and external
control of field power.
Bob . . .
Message 2
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| Subject: | Which 55-60 amp alternator |
Thanks Bob,
The online alternator vendors don't supply data such as mounting bracket
dimensions, pulley diameter etc. they just say it fit a particular make and
model car.
Can I assume that a 12V 60 amp Denso alternator has the same mounting
dimensions as the 60 amp Plane Power that Vans sells?
I'm not sufficiently familiar with the
choices to advise you confidently. It would
seem that the driving constraint is purely
mechanical. Research the parts available to bolt
it to the engine including any changes to
the stock pulley.
Fair enough. Anyone have any experience with this? I've already wired the
plane for external control and crowbar as I agree with the philosophy. So I
would like to keep it this way. Nothing lasts for ever. So my theory is to
buy two alternators online for the price of one B & C or Plane power. Mod
them both for external control and one will be then be a spare. :)
Unless you're willing to tackle mechanical
integration issues along with electrical, you'd
probably want to limit you search to frames
already supported by off-the-shelf attach
hardware.
Exactly. Still need top know the dimensional data. Anyone have a Vans,
B&C, Plane Power 60amp that it will to measure the mounting bracket boss?
That used to be a 'thing' to consider with
external fans with blades optimized for direction
of rotation.
[]
<https://encrypted-tbn2.google.com/images?q=tbn:ANd9GcR2RVsXHbk96gX586Gl_JTF
HKS_mmDSHKRKUjjI9eeWbpWLysEs>
Modern alternators have internal fans with
little if any 'sculpturing' of the blades
[]
<https://encrypted-tbn0.google.com/images?q=tbn:ANd9GcRwC9Tc1fQL5bJpQsZWZ0yb
e93jtsul4qEU7xFg2-p7TEfV9fuy>
Rotating an alternator 'backwards' in an
airplane is unlikely to pose any problems.
First, you're exceedingly unlikely to stress
your alternator in a manner that produces
maximum rated internal heating. The cooling
environment under the hood of a car is MUCH
worse than under the cowl of your airplane.
Further, you're going to be spinning the
alternator much faster than the original
application design point . . . cooling is
not a big issue.
OK, makes sense. I will not be concerned with direction of fans.
You can run it internally regulated . . . you
could do a mod similar to that offered by Plane
Power for crowbar ov protection and external
control of field power.
I'm confused by the above statement. Does that not make it externally
controlled or is there a variation on a theme here? Is there a document
that describes the PP mod?
Bevan
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