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Logictrol 7 for sale - 12/18/2012 1:53 AM   
crigotti


 

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From: North Liberty, IA, USA
Status: offline 		I hope this isn't against the rules. If it is I'll remove it right away.

I have a Logictrol 7 with 5 servos for sale here:

http://www.rcuniverse.com/market/item.cfm?itemID=888822

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RE: Logictrol 7 for sale - 12/18/2012 3:09 AM   
HighPlains


 

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From: Over da rainbow, KS, USA
Status: offline 		Can you tell me what voltage the transmitter pack is?

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RE: Logictrol 7 for sale - 12/18/2012 3:12 AM   
crigotti


 

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quote:

ORIGINAL: HighPlains

Can you tell me what voltage the transmitter pack is?

12.0 Volts. You can see it in the 2nd picture. It is marked right on the transmitter battery.

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RE: Logictrol 7 for sale - 12/18/2012 4:17 AM   
HighPlains


 

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Status: offline 		Thanks, I've got almost the same radio, but mine is on 72 MHz and has a vinyl case and vertical meter with the antenna on the top right side. I took out the transmitter battery to prevent possible damage and forgot to write down the voltage. I got it working 42 years ago, but never flew it. PS-2 servo speed was glacial. It was from around 1967 or '68.

Your transmitter appears to be alodine aluminum so it must be around '66 or so.

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RE: Logictrol 7 for sale - 12/18/2012 12:59 PM   
crigotti


 

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From: North Liberty, IA, USA
Status: offline 		You mean like this?



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RE: Logictrol 7 for sale - 12/18/2012 1:49 PM   
grotto2



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Status: offline 		Please get those batteries outta there!

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I dont know why all you people seem to think this is magic. Its just this little chromium switch here.

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RE: Logictrol 7 for sale - 12/18/2012 2:35 PM   
HighPlains


 

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Status: offline 		Yes, that is the 5 channel version of my 7 channel. I knew of the earlier designs with a AND gate logo joining E and K, but had not seen the version you have for sale.

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RE: Logictrol 7 for sale - 12/18/2012 4:45 PM   
Bax


 

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quote:

ORIGINAL: crigotti

You mean like this?




That's the same one I had as my first RC system in 1969, with the MM-3 servos!

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RE: Logictrol 7 for sale - 12/18/2012 7:09 PM   
HighPlains


 

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Status: offline 		1969 was a ground breaking year for EK. The airborne pack with the MM3 dual rack servos was 50% lighter and quite a bit smaller than the Orbit PS-2 servos shown in the OP pictures. But the really big deal was EK introduced the 3 wire servo and two wire battery pack which was 2 years before anyone else. The older systems had the 8.4 seven cell battery pack tapped at multiple points. Mine was tapped at 3.6, 6.0 and 8.4 as well as the ground. This meant servos had 5 wires and big plugs.

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RE: Logictrol 7 for sale - 12/18/2012 7:31 PM   
jaymen


 

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Status: offline 		Logictrol I versions had the plum colored anodizing, and the and gates in the logo, Bonner Transmite servos that were coverted to proportional were used. Logictrol II was in the bright red anodized case and had a 5 ot 7 on the front, they used Orbit PS-2 servos. Logictrol III had the vinyl clad case. Nice radios, but for some reason Logictrol erroniously figured it was more important to have extra channels than to provide the flyer with rudder and throttle trims....weird! This was a definite shortcoming.

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RE: Logictrol 7 for sale - 12/18/2012 8:35 PM   
HighPlains


 

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Status: offline 		I think we have proved that Logitrol II transmitters were done first in red anodized cases, then later in vinyl clad. The switch would have been made between the '67-'68 models. EK waited till '69 or '70 before the Logitrol III with the closed stick. They seemed to alternate years between making changes to the transmitter, then airborne equipment. Orbit was the first with a vinyl case around 1967, and it was soon copied. It makes sense that they used Bonner servo mechanics first. After all Krause (I think that is how he spelled his last name) designed the electronics for the relayless servo for Bonner.

As far as trims were concerned, they had rudder, elevator and aileron trim on the 5 and 7 channel radios, just nothing for the throttle. I don't think that Bonner sticked radios have throttle trim either, though they look like they would. Pulling fuel lines or tossing a rag into the prop worked well enough.

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