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28v diesel engine

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nuckollsr(at)cox.net
Guest

Posted: Tue Nov 28, 2006 5:18 am Post subject: 28v diesel engine

 	  Quote: 	
		  Comments/Questions: Bob,



I am installing a DeltaHawk diesel engine in my homebuilt and they have 

decided to go with a 28 VDC starter and alternator.  I have already 

purchased most of my avionics in 14 VDC.  I can buy a step-down 

transformer from Aircraft Spruce, but is there a good way to run parallel 

14 V batteries for power and still use the 28 V alternator for 

charging?  Seems like I'm between a rock and a hard place.


	


   Yup, your sure are! There's no graceful way to

   do this.  The best solution is to use 2 batteries

   in series for cranking, change to parallel for

   operating and running a 14v alternator.



   bob . . .

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oldbob(at)BeechOwners.com
Guest

Posted: Tue Nov 28, 2006 6:27 am Post subject: 28v diesel engine

Good Morning 'Lectric Bob and Mr. Delta Hawk User,



Just as a 'For What It Is Worth', such an arrangement

has been used in at least one certificated aircraft.



La Belle Caravelle used a relatively high DC voltage

to crank the Rolls Royce turbine engines with which it

was equipped.



There was a lever just to the left of the pilot seat

which changed a bank of NiCads from twenty-eight volt

parallel operation to something like one hundred and

fifty volts DC in a series arrangement.



I have forgotten the precise voltage used, (It has

been almost thirty years since I last flew a

Caravelle) but the arrangement worked as long as the

NiCads didn't blow up!



Since almost all mechanical systems on the Caravelle

were identical to the DeHaviland Comet, I would not be

at all surprised to find that the same setup was used

for it. 



Worked great.



DO NOT ARCHIVE



Happy Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

Stearman N3977A

Brookeridge Air Park LL22

Downers Grove, IL 60516

630 985-8503

--- "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>

wrote:



 	  Quote: 	
		   

 Nuckolls, III" <nuckollsr(at)cox.net>

 

 

 >Comments/Questions: Bob,

 >

 >I am installing a DeltaHawk diesel engine in my

 homebuilt and they have 

 >decided to go with a 28 VDC starter and alternator.

  I have already 

 >purchased most of my avionics in 14 VDC.  I can buy

 a step-down 

 >transformer from Aircraft Spruce, but is there a

 good way to run parallel 

 >14 V batteries for power and still use the 28 V

 alternator for 

 >charging?  Seems like I'm between a rock and a hard

 place.

 

    Yup, your sure are! There's no graceful way to

    do this.  The best solution is to use 2 batteries

    in series for cranking, change to parallel for

    operating and running a 14v alternator.

 

    bob . . .

 

 



 Click on

 about

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 www.buildersbooks.com

 Admin.



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 http://www.matronics.com/Navigator?AeroElectric-List

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George W Braly

Joined: 09 Jan 2006
Posts: 15

Posted: Wed Nov 29, 2006 6:14 am Post subject: 28v diesel engine

Bob,



The fuel injection control system on the diesel engine may require 28

volts for operation.



Regards,  George



--

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nuckollsr(at)cox.net
Guest

Posted: Wed Nov 29, 2006 7:06 am Post subject: 28v diesel engine

At 08:12 AM 11/29/2006 -0600, you wrote:



 	  Quote: 	
		  



Bob,



The fuel injection control system on the diesel engine may require 28

volts for operation.



Regards,  George


	


   Hmmm . . . so those guys are going electronic too . . .

   I guess it comes down to a $time$/weights/parts-count

   issue.



   Depending on how much current the engine needs, it

   might be better to use a small 28v battery and step-up

   inverter as opposed to a 14 volt battery and step

   down inverter to support already purchased avioncs.



   To craft decision right may take as much engineering

   $time$ as the delta-dollars to sell the 14-volt

   goodies and buy 28-volt versions.



   Life can get complicated sometimes!



   I had a weird phone call yesterday from a guy

   building a Seawind who was planning to install a

   PT-6 engine. He started out asking where to buy

   100A fuses and I steered him onto the usual suppliers.



   The conversation expanded to wire sizing and system

   architecture for engines with starter-generators and

   it was obvious that he had little knowledge and no

   experience with the issues. Yet as I attempted to

   steer him in the right direction, he insisted on

   arguing with my suggestions. I kept telling him that

   I wasn't going to argue with him and that our

   conversation was taking time from my work for a paying

   customer.



   He kept asking questions and then arm-wrestling

   with the answers. I finally suggested that he hire

   a professional to craft a wirebook for his airplane

   and offered by services at $150/hour. He replied,

   "For that kind of money I'll do it myself" whereupon

   I opined, "Then I guess you don't need me" and hung up.



   That's the first time I've ever had to forcibly

   terminate a conversation with a builder. I do

   wish the fellow well but I'm not optimistic!

   Some of life's complications are truly intractable.



   Bob  . . .

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gcomfo(at)tc3net.com
Guest

Posted: Wed Nov 29, 2006 12:27 pm Post subject: 28v diesel engine

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nuckollsr(at)cox.net
Guest

Posted: Wed Nov 29, 2006 6:51 pm Post subject: 28v diesel engine

At 03:25 PM 11/29/2006 -0500, you wrote:



[quote]



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George W Braly

Joined: 09 Jan 2006
Posts: 15

Posted: Thu Nov 30, 2006 7:02 am Post subject: 28v diesel engine

I sympathize with your conversation on the Seawind.



We get those phone calls around here on engine issues.



Usually they are all good.  But sometimes - - somebody who is way behind

the power curve wants to engage in protracted debates over well settled

issues.



Regards,  George



--

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William.P.Dube(at)noaa.go
Guest

Posted: Thu Nov 30, 2006 8:02 am Post subject: 28v diesel engine

Reminds me of the Monty Python routine "I came here for an argument." 

 

 Also, they say that arguing with an engineer is a lot like wrestling with a pig in the mud. You soon will realize that the pig is actually enjoying it.

 

 Bill D.

 

 George Braly wrote: [quote]   [quote]--> AeroElectric-List message posted by: "George Braly" <gwbraly(at)gami.com> (gwbraly(at)gami.com)    I sympathize with your conversation on the Seawind.  We get those phone calls around here on engine issues.  Usually they are all good.  But sometimes - - somebody who is way behind the power curve wants to engage in protracted debates over well settled issues.  Regards,  George    --

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