[ARC5] AN-Ranges - engines.

[Scott Johnson]

More than rotational speed, it is piston velocity.  That's why endurance races favor over square engines (bore greater than stroke)

Scott V. Johnson W7SVJ
5111 E. Sharon Dr.
Scottsdale, AZ 85254-3636
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-----Original Message-----
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of Michael Hanz
Sent: Friday, May 4, 2018 7:17 PM
To: Kenneth G. Gordon <kgordon2006 at frontier.com>; Peter Gottlieb <kb2vtl at gmail.com>; arc5 at mailman.qth.net
Subject: Re: [ARC5] AN-Ranges - engines.

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

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