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B&C Alternator Question

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terrycalloway(at)mac.com
Guest

Posted: Mon Jan 25, 2010 2:26 pm Post subject: B&C Alternator Question

If using a B&C Alternator has anyone put a blast air tube to it for cooling?



Is this necessary?



Pumper

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dougsappllc(at)gmail.com
Guest

Posted: Mon Jan 25, 2010 2:44 pm Post subject: B&C Alternator Question

Terry,Rather you install a small scoop and 1.5 inch scat (which is cheaper) or install the cut vanes and blast tubes from the shutters aft, it should be cooled to assure max life out of it. 

Doug 

 

On Mon, Jan 25, 2010 at 2:24 PM, Terry Calloway <terrycalloway(at)mac.com (terrycalloway(at)mac.com)> wrote:

 	  Quote: 	
		   --> Yak-List message posted by: Terry Calloway <terrycalloway(at)mac.com (terrycalloway(at)mac.com)>

 

 If using a B&C Alternator has anyone put a blast air tube to it for cooling?

 

 Is this necessary?

 

 Pumper

 

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cd001633(at)mindspring.co
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Posted: Mon Jan 25, 2010 4:07 pm Post subject: B&C Alternator Question

Terry,



On my CJ I used the cooling tube that was used to cool the old Generator.  it's already there and pointing the right direction.

I think blast air cooling would be helpful for the alternator.



Sam Sax

Miami



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jgriffint28(at)cox.net
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Posted: Mon Jan 25, 2010 7:43 pm Post subject: B&C Alternator Question

Terry, I have a B&C on my CJ with no cooling scat to it. No signs of failure 

for 12 years. {voltage regulator did go}.

Jim Griffin



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javiercarrascob

Joined: 06 Sep 2009
Posts: 62
Location: Virginia

Posted: Mon Jan 25, 2010 8:58 pm Post subject: B&C Alternator Question

Hi Terry,

  

 B&C Alternator on a Yak-55 no problems except for the the voltage regulator, it needs to go in the inside of the firewall other wise it will cook. (Happened last summer).

  

  

 JC



--- On Mon, 1/25/10, Jim Griffin <jgriffint28(at)cox.net> wrote:



 [quote]

From: Jim Griffin <jgriffint28(at)cox.net>

Subject: Re: B&C Alternator Question

To: yak-list(at)matronics.com

Date: Monday, January 25, 2010, 10:42 PM



 --> Yak-List message posted by: "Jim Griffin" <jgriffint28(at)cox.net (jgriffint28(at)cox.net)>



Terry, I have a B&C on my CJ with no cooling scat to it. No signs of failure 

for 12 years. {voltage regulator did go}.

Jim Griffin



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mark.bitterlich(at)navy.m
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Posted: Wed Jan 27, 2010 2:41 pm Post subject: B&C Alternator Question

Not necessary.  



Mark Bitterlich 

 



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mark.bitterlich(at)navy.m
Guest

Posted: Wed Jan 27, 2010 2:47 pm Post subject: B&C Alternator Question

The original generator has a specification for maximum rating both with

and without cooling air.  

Please consider that this was a 3 KW generator meaning it could handle

about 100 amps... More or less. 



There are TWO types of B&C alternators that can go on the YAK.  One is

the 10 amp PMG model, and the other is a 35 amp standard alternator

model.  



The 10 amp PMG model, that uses the small external regulator module

(that does not have over-voltage protection unless you buy an additional

kit) and is a SEALED UNIT.  The maximum continuous load rating of this

unit is 280 watts.  The case design can easily dissipate 100 watts of

heat or more ambient, so I personally do not think forced cooling is

necessary.  Keep in mind that the old generator (3 KW) that was on there

could ALSO run without any cooling air at all, but you had to de-rate it

to a much lower rating if you did that... Which by the way was over 10

amps.  



The 35 amp model also is used in various other aircraft, all WITHOUT

forced air cooling.  



Alternators by and large are more efficient that generators, so they

generate less overall heat.  In addition, on the 10 amp model, the

rectifier is external, so even less heat is generated in the unit

itself.  



Based on that, I really do not think external cooling is necessary.  



If there is any doubt, fire up the motor to about 60% power or more,

turn on every darn thing in the aircraft that you can turn on, and run

it for about 10 minutes or less.  Then use an IR temp gun and read the

difference in temperature between the engine case and the B&C alternator

case.  If there is a major temp. difference, then use your air tube. 



Mark Bitterlich.  



P.s.  Every single YAK or Sukhoi that I have experience with that has

this small 10 amp B&C does NOT have a blast tube for air cooling.  What

usually goes first is the voltage regulator.  Purchase of the

over-voltage protection kit with this model is HIGHLY recommended.  If

the PMG generator does fail, it is usually a mechanical failure and not

an electrical one (as would be the case with over-heating).  





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