Bill,
I totally agree with everything you said. I'm not trying to down the AL-80,
it's just saying that in the manual can set a company up for liability. That
was the point I was trying to get across. If Ameritron has a letter from Eimac
saying it's ok, then they are relieved of the liability.
By the way, the factor you mention, I always called the fudge factor or safety
factor. Same thing all around : )
Best,
Will
*********** REPLY SEPARATOR ***********
On 6/26/06 at 9:17 PM Bill Coleman wrote:
>On Jun 26, 2006, at 10:51 AM, Will Matney wrote:
>
>> Now what if a designer said they'd carry a 40 amp load at 10
>> amperes a piece? How long would they last at this output? Would
>> Motorola warranty them at this? What kind of reputation would the
>> manufacturer get over their power supplies blowing pass transistors
>> under full load? Are they willing to replace the product? Are they
>> ready for a law suit from a disgruntled customer? The design falls
>> back on the engineer, his license, and liability at worse case.
>> Where I worked in mining machinery, it occurred often.
>
>In mechanical engineering, they usually refer to this as a "design
>rule". For example, light aircraft are typically designed to
>withstand 3.8 positive Gs (in the Normal category). But, you wouldn't
>build a structure that can just withstand 3.8 positive Gs and then
>fail. No, you'd design a structure that could withstand 1.5 to 2.5
>times MORE, depending on the materials and construction techniques.
>
>Aircraft are a good example, because that extra strength comes at a
>price: weight. Excess weight costs aircraft dearly in nearly every
>performance category. The design rule is purposely kept low.
>
>The design rule allows you to compensate for factors that are beyond
>your control, such as differences in assembly, deterioration of
>materials, improper use, improper installation.
>
>Design rules vary depending on the type of design. Man-carrying
>equipment, for example, requires, by law, design rules of 10 or more.
>That's why that clip for your tower belt is rated for 5000 lbs, even
>though it isn't even likely to see 500 lbs.
>
>--
>
>The AL-80A and AL-80B have been around long enough to establish a
>positive track record. It's pretty clear, that regardless of what the
>manual says, these units are not self-destructing because of
>excessive plate current.
>
>Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
>Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|