[NSRCA-discussion] 4.8 volt Vs 6.0 volt

[Bill Glaze]

O.K., Bob, here goes:
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!
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.
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.
Bill Glaze
  ----- Original Message ----- 
  From: Bob Richards 
  To: NSRCA Mailing List 
  Sent: Thursday, March 09, 2006 1:59 PM
  Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt


  Ron,

  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. :-)

  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.

  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?? :-)

  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.

  Bob R.

  Ron Van Putte <vanputte at cox.net> wrote:


    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.


    Ron Van Putte


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