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<DIV><FONT face=Arial>O.K., Bob, here goes:</FONT></DIV>
<DIV><FONT face=Arial>Yeah, we had escapements cascaded for rudder and engine
control. Two positions on the engine: full speed and a rather
undependable, erratic idle. Who needs more than 2 positions for engine
speeds, anyhow? I've proven that I certainly don't!</FONT></DIV>
<DIV><FONT face=Arial>I really don't know how much pulling power the Bonners
had, (pulling power vs. torque because they were straight line servos) but I
suspect that they were kind of wimpy. Probably because Howard (Bonner) was
using just about the cheapest Japanese toy electric motors
obtainable.</FONT></DIV>
<DIV><FONT face=Arial>They did, however, pass the acid test: They worked
remarkably well. And, at least the brushes were Phosphor Bronze, which was
a whole lot better than simple copper or brass. Jeez, when I think about
the stuff we had then, (and remember: it was state of the art)........ I
wonder how the sport survived. But it did.</FONT></DIV>
<DIV><FONT face=Arial>Bill Glaze</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 09, 2006 1:59
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] 4.8 volt
Vs 6.0 volt</DIV>
<DIV><BR></DIV>
<DIV>Ron,</DIV>
<DIV> </DIV>
<DIV>I remember when KPS-14 and KPS-15 were the servos of choice (or PLS-14
and PLS-15 for us Proline fans). Much simpler times. No need for four
digit servo numbers. :-)</DIV>
<DIV> </DIV>
<DIV>My first radio came with KPS-11 servos with the linear output racks.
You know, pull-pull setups would be so simple with linear outputs.<BR></DIV>
<DIV>Now I expect all the REALLY old farts to chime in about having to wind up
their rubber-band escapements before each flight. (Bill Glaze?? :-)</DIV>
<DIV> </DIV>
<DIV>I suspect the servos he has will be fine if the throws are kept down to
the small amount needed for pattern. However, the control surfaces are
probably much larger than anything on pattern planes back in the 60s/70s, so
the longer moments will be working harder against the servos.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><B><I>Ron Van Putte <vanputte@cox.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><BR>
<DIV>Third, you may not be aware, but 30 years ago many of us were using
Kraft KPS-12 servos (smallest and lightest!) in .60 cu-in
engine powered airplanes weighing up to 8 pounds. The KPS-12
servo had a torque of 18 in-oz. Think about that for a while.</DIV>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV>Ron Van Putte</DIV></BLOCKQUOTE>
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