----- Original Message -----

From: Schemmel, Grant

To: Rotary motors in aircraft

Sent: Friday, February 18, 2005 8:56 AM

Subject: [FlyRotary] Re: Digital Fuel Monitoring System

Hi Ed,

 

I wouldn't sweat the "resistor on legs" issue too much, it only becomes a vibration issue with parts that have a large mass.  I work for a company that builds space grade circuit cards, and used to work on PT6 fuel controls when I worked for Hamilton Standard, so I've seen typical construction for this kind of application.  If you are worried about axial leaded components, mount them close to the circuit card and put a dab of epoxy under them for bonding.

 

On an aside, I would appreciate a photo of your board emailed direct, as my workplace blocks all jpegs.

 

Thanks

 

Grant Schemmel

-----Original Message-----
From: Ed Anderson [mailto:eanderson@carolina.rr.com]
Sent: Friday, February 18, 2005 5:57 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Digital Fuel Monitoring System

Geez, Finn, I was unaware that there was a "protocol" for resistor sizes on PC boards.  Seriously, is there some reason (vibration?) for forcing resistors all the way to the board or is it just "esthetics?".

 

Ed A

----- Original Message -----

From: Finn Lassen

To: Rotary motors in aircraft

Sent: Thursday, February 17, 2005 11:06 PM

Subject: [FlyRotary] Re: Digital Fuel Monitoring System

Nice.

I assume those resistors are just temporary until you get hold of smaller ones that can actually rest on the PCB rather than hanging in their legs? I know it's not flight critical, but still...

Finn

Ed Anderson wrote:

Here are a couple of photos of my homebrew digital fuel monitoring system, I have mentioned in the past (seems like I've been working on it forever).  Got the PC board in today and got it mostly populated with the components.  It will sit in a 2 1/4" instrument case with the LCD extending out past the boundary of the case.  I plan on trying some vacuum molding of thin ABS plastic to form a  attractive front cover.

 

The front panel shows the LCD display screen as well as the push buttons for loading fuel, setting alarms and selecting which screen you wish to display.  The center shaft controls the LCD backlite so it will be visible either in day or night.

 

Hopefully, I have designed and constructed the board properly (my first microcomputer/controller board) and if so, then the software (which I have completed)  will be loaded and it will be installed in the aircraft for testing.  I certainly plan on having it installed for Sun & Fun.

 

Ed