[NSRCA-discussion] 4.8 volt Vs 6.0 volt -now nostalgia
Dean Pappas
d.pappas at kodeos.com
Sat Mar 11 11:52:53 AKST 2006
Let's see ... There was Kraft's KP-9 which used a variable cap in the one-shot, and F&M's Magnevac servo that used a variable inductor, in an R-L timed one-shot. I worked up a differential-variable aperture phototransistor setup, in the lab at work on my lunch hours back when ... I was describing it to Jim O. at Toledo, many moons ago, when he told me to go look at the "brand new" PCM stuff in the Futaba booth, as well as the Simprop SAM, that was being sold in Europe. Jim, I remember you saying that servos would take a developmental back-seat until this PCM stuff had fully developed. You were right. Any other predictions?
Dean P.
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org on behalf of Earl Haury
Sent: Sat 3/11/2006 3:37 PM
To: NSRCA Mailing List
Cc:
Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt -now nostalgia
Dwayne
I also looked at phototransistor options in the 80's before soft mounts, and
servos with multiple pot wipers, ball bearings, etc. There were also early
servos with variable caps in the R-C circuit. Now various shaft encoders are
attractive, but all the alternates tend to suffer high power consumption,
high weight, large size, and/or high cost. Hard to beat a $0.50 pot if
you're a manufacturer. Of course the other option is to eliminate the
vibration that eats pots - Merle Hyde did us all a huge service with his
mounts - E power will pretty much allow us to forget the pots are there.
Earl
----- Original Message -----
From: "dwaynenancy" <dwaynenancy at cox.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, March 11, 2006 11:40 AM
Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt -now nostalgia
> There are ways. Sent Kraft a prototype using a phototransistor in the
> late '70's. Dwayne
>
> Earl Haury wrote:
>
>>I flew escapements in the 50's (the price of reed stuff drove me away).
>>While campaigning an A/FX Hemi Dodge drag car at the AHRA Nats in Gary IN
>>around 1964 I watched as someone demonstrated aerobatic R/C flight during
>>intermission. I've never know who it was - but I recall the airplane being
>>low wing and actually doing AXIAL ROLLS! That left an impression that,
>>after
>>drag racing and trap shooting, surfaced with getting back into R/C in
>>1972 -
>>my "trainer" was a Joe Bridi Kaos so that I could do rolls. Fortunately, I
>>missed the relay / travel stop actuators and flew the thing with a
>>Heathkit
>>8ch radio and KPS12 equiv servos - amazing how much better I found the
>>Proline / KPS15 system when I started competing in '74 with a Norm Page
>>Mach
>>1. Been hooked ever since and still waiting for servo pots to go away.
>>
>>Earl
>>
>>
>>----- Original Message -----
>>From: "J.Oddino" <joddino at socal.rr.com>
>>To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>Sent: Saturday, March 11, 2006 10:56 AM
>>Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt
>>
>>
>>
>>
>>>I don't see how anyone can call me old. I've been 29 for as long as I
>>>can
>>>remember. I'm 29 to the 1.274 power now and since I got my new knees I
>>>really feel young. I went to the gym this week (four weeks after
>>>surgery)
>>>and did 1.6 miles in half an hour on the treadmill and made 65 free
>>>throws
>>>in a row. Wait til I get my hook shot back. None of these young guys
>>>have
>>>hook shots so they don't know what to do when they get the ball under the
>>>hoop. The usual result is a blocked shot.
>>>
>>>I hate to admit this, but I remember when servos didn't have numbers. In
>>>fact I remember when model airplane servos weren't really servos. They
>>>were
>>>actuators with limit switches and neutralizing switches and driven by
>>>relays
>>>in the receiver. Then Bonner/Elliott put transistors in the "servo" to
>>>get
>>>rid of the relays in the receiver. I'm not sure who gets the credit for
>>>having the first commercially available proportional servos but I
>>>remember
>>>giving up building my own and buying some Space Control servos in 1961.
>>>What is most interesting is the fact modern servos work basically the
>>>same
>>>as the so called "digital servos" introduced by Mathes and Spreng in
>>>about
>>>1963 in their Digicon system. I think this was before Bob Richards was
>>>born.
>>>
>>>Jim O
>>>
>>>
>>>----- Original Message -----
>>>From: "Jerry Budd" <jerry at buddengineering.com>
>>>To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>>Sent: Thursday, March 09, 2006 7:26 PM
>>>Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt
>>>
>>>
>>>
>>>
>>>>>OK. That settles it. Jim Oddino is just as old as me and I expect
>>>>>he will be offended that you call people our age old. He lives out
>>>>>there on the left coast and he will probably find you, wherever you
>>>>>hide, and punish you. Right Jim?
>>>>>
>>>>>
>>>>Yeah, but he's [Bionic] and likely to last forever. Besides, he
>>>>shoots free throws better than I do.
>>>>
>>>>
>>>>
>>>>> > Sheesh! Single digit servo numbers? How <retro>.
>>>>>
>>>>>Single digit servo numbers? 12 is a single digit? What public
>>>>>school did you graduate from, sonny?
>>>>>
>>>>>
>>>>Umm, umm (too embarassed to think of a comeback...!).
>>>>
>>>>
>>>>
>>>>> > Next you're going to tell us how CA bottles used to be sealed with
>>>>>
>>>>>
>>>>>> wax!
>>>>>>
>>>>>>
>>>>>CA? What's that? The only things I can remember that were sealed
>>>>>with wax were the receiver IF transformers and the little bottles of
>>>>>sweet water you got from the grocery store.
>>>>>
>>>>>
>>>>Don't you use wax to hold your false teeth in place? ;-)
>>>>
>>>>Jerry
>>>>--
>>>>___________
>>>>Jerry Budd
>>>>Budd Engineering
>>>>(661) 722-5669 Voice/Fax
>>>>(661) 435-0358 Cell Phone
>>>>mailto:jerry at buddengineering.com
>>>>http://www.buddengineering.com
>>>>_______________________________________________
>>>>NSRCA-discussion mailing list
>>>>NSRCA-discussion at lists.nsrca.org
>>>>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>
>>>>
>>>>--
>>>>No virus found in this incoming message.
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>>>>
>>>>
>>>>
>>>>
>>>_______________________________________________
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>>>
>>>
>>>
>>
>>
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