[NSRCA-discussion] 4.8 volt Vs 6.0 volt -now nostalgia
dwaynenancy
dwaynenancy at cox.net
Sat Mar 11 14:54:07 AKST 2006
Don't forget the F&m design with an iron core in an electric field. I
saw one of those servos go for over $400 on ebay. Dwayne
Earl Haury wrote:
>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
>>>>>
>>>>>
>>>>>--
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>>>>>Checked by AVG Free Edition.
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>>
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