[ARC5] AN-Ranges - engines.

[Michael Hanz]

We may be looking at this from the wrong end.  The key to long engine 
life is low rotational speed.  That's one reason I like my Honda 
EU7000is, which generates DC and the converts it to 60 Hz with an 
inverter, with engine speed based on load.  Most of the time with our 
house load, its engine speed is in the mid-1,000s.  For an early system 
like the vintage example, all that is needed to reduce the pole count 
for, say, a 900rpm engine, is a gearbox.  Change the oil once a year and 
it will run a long time without maintenance.

73 - Mike KC4TOS

On 5/4/2018 8:29 PM, Kenneth G. Gordon wrote:
> On 4 May 2018 at 19:06, Peter Gottlieb wrote:
>
>> They had that at Dayton last year.
>>
>> I still am hugely skeptical about the 60 RPM generator.  It would have to be
>> huge to get enough change in field at the poles, and making an engine that did
>> that, including a humongous flywheel with enough stored energy for all the poles
>> in between combustion pulses would make it pretty impractical.
> Hmmm....I just found this:
>
> www.oldengine.org/members/frank/kohler2.htm
>
> In 1924, about 30 years before Woody and I were discussing the airways beacons, the U.S.
> Government bought 59 Model "D" Kohler "light plants" for airways beacons in the Eastern
> U.S.
>
> The Model "D" had a 4 cylinder OHV 8 HP engine which turned at 1000 RPM and the
> genset output 110 VDC, 1500 watts.
>
> Woody told me that the gensets used in Montana beacons were 1500 watts, but I really
> doubt that the FAA was using the same Kohler gensets 30 years later. Fiurthermore, as I
> remember it, Woody told me that his gensets output 60 Hz AC since they also had to power
> some sorts of radio equipment at certain beacon sites.
>
> Ken W7EKB
>
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-- 
Michael Hanz - KC4TOS