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HelicopterOff Topics › Question for old plankers
11-29-2005 03:35 AM  12 years agoPost 1
brooksnb

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Sussex , New Brunswick , Canada

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Sorry to call you old .. ..but if you have been around for a few years you may know what I have found.
I was given an old trainer plane (crashed) and it came with a very different TX , RX and servos ...at least different from any I have ever seen. The TX is a "Kraft Sport Series" it is all metal cased and sort of a golden yellow color. The RX is also unique, The servos don't seem to have a makers brand on them but they are a cream colerd plastic casing if that helps. I don't see any crystal or place to locate the frequency...however if I do use this TX I would like to know the frequency ...I know better than to bring this old stuff to a fun fly but I think it might be worth playing with. The trainer plane has a glo engine...again no name is apparent but it looks like a 25 or maybe even a 15 !! Does anyone have any knowledge as to what I might be looking at ??

.

Never, under any circumstances, take a sleeping pill and a laxative on the same night.... Dennis

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11-29-2005 03:57 AM  12 years agoPost 2
helidad2

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potosi mo. usa

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I have a couple of those they were good radios I flew my first kavan jet ranger with one. The only way to tell the freq would be to open it up and find the xtal it will be written on the xtal . They use to have a sticker on the back with the freq on it the same thing for the rx it. Could be from late 70's through the 80's without a picure it would be hard to tell is it an open gimbal ( square hole around the sticks or closed gimbal round hole around the sticks ) the open gimbal were the later models.

even a blind hog finds an acorn now and then

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11-29-2005 04:05 AM  12 years agoPost 3
Spitfire_mk5

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Canada

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Not an old planker, but I do fly with them

post a pic of the trainer and I might be able to help ya (or its constituant parts). Does it have ailerons or is it rudder only?

Kraft radio's used to be one of the big names in the 1970's and early 80's. But be careful with that set, look over the case and see if you can see a gold label with 91 certified on it, if you can't find one then its probably an AM set which:

a) didn't have channel numbers just the actual frequency was used
b) is illegal under both AMA's and MAAC's current rule sets.

If you do want to use it and its AM its on you; but pin up with the channel your on as well as the ones directly to either side of it --those old AM sets weren't the best for bleed over and that was standard practice "back in the day" (these old AM channels are located between a few of the current in use ones).

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11-29-2005 12:06 PM  12 years agoPost 4
brooksnb

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Sussex , New Brunswick , Canada

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I suspect it is an AM TX 72.760 is on a black and gold label. Mean anything to anyone ??

Never, under any circumstances, take a sleeping pill and a laxative on the same night.... Dennis

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11-29-2005 01:08 PM  12 years agoPost 5
Hawk4flyer

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Deland,Florida

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Black and gold could be the color code for the freq. Thats from years past for sure. Back when we only had 30 channels to fly on.

Be wary of flying it around other pilots. The freq spread is wide enough to hit adjacent channels.

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11-29-2005 04:50 PM  12 years agoPost 6
Jeff H

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Cincinnati, OH

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I suspect it is an AM TX 72.760 is on a black and gold label
Gold stickers with black writing on them were the stickers used by the AMA to show that the older radios have been narrow-banded to the current 1991 standard.

What exactly does your sticker say?

If it is the right gold sticker, it is legal to use. But remember, gold stickers were only issued for transmitters. Most old recievers were still wide band even though the transmitter had been narrow banded. The reciever could pick up adjecent channels.


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11-29-2005 05:36 PM  12 years agoPost 7
whirlyspud

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USA

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Do the servo wires have 3 or 4 conductors?

Mike

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11-29-2005 06:49 PM  12 years agoPost 8
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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I had a very old(even then) one of those in 1982.Keep it on a shelf and put a new cheap 4 channel in the plane.

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11-29-2005 06:50 PM  12 years agoPost 9
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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I remember the two color ribbon system as well.

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11-29-2005 07:49 PM  12 years agoPost 10
whirlyspud

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USA

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All i remember of the old system is that orange and white was 72.400mhz

I think a black band was only used for radios on ham bands, and i dont remember gold ever being part of the system. Brown and black was one of the hams channels. Don't remember any of the others. Too long ago. We still have a few old farts here that ask if radios are "gold stickered" or not. They look at me funny when I tell them they stopped the gold sticker program years ago.

Mike

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11-29-2005 08:19 PM  12 years agoPost 11
brooksnb

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Sussex , New Brunswick , Canada

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QUOTE]Keep it on a shelf and put a new cheap 4 channel in the plane.[/QUOTE]

I have lots of planes...the fun here will be using the old system for the sheer fun of it. I have several modern tx and rx systems but never have I tried one nearly this old. I have plenty of places to fly without having anyone else in the sky ...I would not dream of flying with this gear unless it was under controlled circumstances for all of the obvious reasons.

Never, under any circumstances, take a sleeping pill and a laxative on the same night.... Dennis

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11-29-2005 10:50 PM  12 years agoPost 12
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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I'm not worried about you.I know you are safe.I just would not trust it.They are neat for a conversation piece though.I remember more interferance issues back then.Especially AM stuff.I was just talking to a friend of mine the other day about how you hardly ever have trouble nowdays without someone directly turning on on your channel. I think the other long time flyers would agree.

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11-30-2005 01:12 AM  12 years agoPost 13
brooksnb

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Sussex , New Brunswick , Canada

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How wide is the spread ?? or is it actually able to cross channel?
I've also got some cream colerd plastic cased servos ...I know they are probally slow but are they known to be tough ?? I don't see any makers name either.
.

Never, under any circumstances, take a sleeping pill and a laxative on the same night.... Dennis

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11-30-2005 02:51 AM  12 years agoPost 14
Inspector Fuzz

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NLA

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cream colored servos

Are the outer edges of the cases slightly rounded, too. Modern servos have fairly sharp 90 degree corners but the old cream colored Kraft servos had "roundy" corners, top, bottom and sides..
My first RC unit was a 3 channel, single stick "Heathkit" that I built at age 12 in 1981..
It used mostly Kraft components and the servos were all kraft.. KPS 15's or something like that... The iddy biddy, for the time, chip that was on the nearly impossible to solder (for a 12 year old) pc board, in the servo had the Kraft name/logo emblazoned on it..
I am guessing that the output shaft on the servo is sqare and probably black in colour..??
JEFF

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11-30-2005 07:05 PM  12 years agoPost 15
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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I remember tx spacing on the flight line was important.3 guys standing too close together could bean down the fourth if everything was just right.It was called 3IM.3rd TX intermodulation if I remember right.

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11-30-2005 07:57 PM  12 years agoPost 16
whirlyspud

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USA

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One other thing, Some of the real old kraft servos had both rotory and a linear output. If I can dig one up I'll take a picture. It amazes me to look back at that stuff. We used huge radios even in .049 sizes models. Todays whole flight pack weighs in about 1 of those old servos.


Mike

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12-01-2005 05:56 PM  12 years agoPost 17
ShuttleJock

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Norman, Oklahoma

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If you have a hobbico frequency scanner you could quickly find what frequency your tx is on.

Kraft was the most popular radio out at the field back in the early 80's You were sitting in tall cotten if you had the Phil Kraft signature series. I have a kraft sport series 6. They are great radios. I never lost a model to a glitch with a kraft. I had my radio narrow banded in '86.

I think that kraft sold out to a Japanese company in the about then. They stayed in business for just a short time after that. They put out a "economy" model radio featuring a thin plastic case. It didn't have a large following.

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12-01-2005 06:29 PM  12 years agoPost 18
brooksnb

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Sussex , New Brunswick , Canada

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Today we hear about JR, airtronics,futaba etc...where were they back in the days of "Kraft" ?? Was Kraft equiptment the most popular ?? was it considered as good quality ??

Never, under any circumstances, take a sleeping pill and a laxative on the same night.... Dennis

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12-01-2005 08:30 PM  12 years agoPost 19
Salty

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St. Augustine

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from what I remember Kraft was the shizzle....my pop had a sig series, dont remember much about it but had always heard kraft was good stuff in the day....

Ask your Doctor if getting off your ass is right for you.

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12-01-2005 10:20 PM  12 years agoPost 20
FLYINFOOL

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Cudahy, WI

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Back in the late 70's / early 80's Kraft and ProLine were top of the line stuff, like Futaba and JR are today.
Futaba was around but was considered Jap Junk.
None of the others of today were around.
Your servos are probably KPS-14 or KPS-15.
The 14 was considered the "small" servo.
The 15 was the "standard" size.
There was a KPS-12 that was the "micro" servo at nearly the size of today’s standard servo. The KPS-12 was also considered incredibly fast with its .4 speed.
The 14 or 15 should have the number molded into the top of the case that has rounded corners.
The 12 had no marking but was held together with a wrap of clear tape and had square sharp corners.
These servos will function with modern equipment and I still use some for non-flight functions in planks.

Kraft always used a black and gold sticker to identify the frequency, long before the "gold sticker" came around.
There were originally 7 frequencies from the days of the colored ribbons.
It was a color and white for 72Mhz, a colored and black for the ham band, and a single color for 27Mhz.
I believe all of those original 72Mhz frequencies are now Illegal to use per the FCC.

You can tell the old-timers at the field by watching them when there is a glitch, it became instinct to hold the transmitter over your head to get a better signal pattern to save the plane.
You did not land and look for a problem after a glitch you just gave a "whew" and kept flying.

Ahhh, the good old days.


Jeff Borowski
RAMS Club President
www.ramsrcclub.com

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