[Amps] Vegetable oil dummy load

[R.Measures]

On Feb 28, 2006, at 3:10 PM, Larry Carman wrote:

>
> According to Vectronics, motor oil does not have a sufficiently high
> vaporizing temperature and will cause excessive vapor.
>
> I found the following quote on eHam:
> Motor oil is not recommended (at least not for long term use,) as the
> volatility and flash point is often lower than mineral oil, and the
> additives will corrode the structure of the resistor used in the dummy 
> load.
> (ARRL Handbook, 1988, CHapter 34, page 22-23.)
>
> I was once told that there was a brand of motor oil without additives 
> that
> Worked very well in dummy loads. I have no idea what brand it was.

I have been using 5w Mobil-1 synthetic in a 500w Bird 50½ termination 
for the past 25 years.  If I had it to do again, I would use 0w oil to 
increase convection.
>
> Regards,
> Larry N5BIP
>
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] 
> On
> Behalf Of VE6TR at telus.net
> Sent: Tuesday, February 28, 2006 4:31 PM
> To: Dave Haupt
> Cc: amps at contesting.com
> Subject: Re: [Amps] Vegetable oil dummy load
>
> Interesting bit of information.  What are the reasons that engine oil 
> (lets
> say
> straight 30 weight) is also not considered acceptable?
>
> Rob - VE6TR
>
>
>
> Quoting Dave Haupt <emailw8nf at yahoo.com>:
>
>> IMO, vegetable oil is a marginal idea at best.  By
>> unfortunate experience, I have learned that it does
>> several things that are quite unpleasant:
>>
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org