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I recently accuired a World Engines 4 channel single stick radio , model # IC-31 It was missing the Tx batt. I assume it was a Dry Cell , No charge jack on the Tx . Does anyone know what size battery (voltage) I need to see if it works .72 mhz digital.I'm new to this forum thing , I apologise if i'm not doing this rite .

5skyhawk172

Pics of TX I think they were 12V I had a Blue Max back in 1972 World Engines

BelAirBob

If this is on the old 72 MHz frequencies, I believe they are illegal to use

2walla

My Feedback: (10)

8 cell nicad.. look close there is a charge jack on it somewhere...

rgburrill

Why do people believe this crap?

do335a

Why do people believe this crap?

Because people keep saying it.

resourcecapital

My Feedback: (2)

acutally tx is probably wide band 72mhz must be modified to narrow band and then put on one of the current frequencies. unless there is a gold sticker on tx it is illegal to use

BelAirBob

The "old" 72 MHz frequencies were given up when the FCC gave AMA the 50 72 MHz frequencies which are still ok to use. The old set only had about 6 frequencies. The transmitter had colored flags such as brown/white, red/white etc. The white denoted aircraft use. My Kraft Series 74 is on 72.08 which is not one of the current 50 frequencies. These had 40 MHz spacing if I remember, which is wide

There was an overlap period in the 1980's but someone will know the history I am sure

larry@coyotenet

My Feedback: (21)

I still have one of those in working condition. It is a World Engines Las Vegas single stick. It uses a square 9volt Eveready dry cell battery that was made for portable radios. It is on wide band 72mhz frequency and is not supposed to be used since it will overlap the channels on each side of its frequency. Mine is yellow and white which is 72.096. I currently have it in working condition with the idea of using an FRSKY DIY module to convert it to 2.4. I have done this with a newer World Engines radio but I am not sure the circuitry of the older radio is compatible. I really liked the radio and used it until the newer 72 radios came out.
Larry

init4fun

I have a couple of those , the original 9V battery that is just a tad bigger than today's version

GallopingGhostler

My Ace Pulse Commander 72MHz wide band RC transmitter used the larger 9V Eveready. Later I replaced it with a 6 cell AA pen cell holder, toward the end of wide band acceptance some 25 or so years ago.

Speaking of vintage RC radio batteries, My 1953 DeBolt Model Engineering Company (DeMECo) 34" Livewire Kitten half-A single channel RC plane shows various flight battery arrangements for the super-regenerative tube (valve) radios of the day. It uses several 22.5 Volt batteries in series for the "B" supply. I remember those photoflash batteries in the 1960's, powered my portable flash units that used M3B flashbulbs. (This was before modern strobe flashes.) They looked just like 9 Volt transistor radio batteries, smaller one in your photo, except they were about 1/4" longer.

I attempted to locate a photo of it without success. What I found instead appears to be similar, except the contacts have been changed to top and bottom and rivet head type contacts, which seems to correspond with the ones in the Kitten's diagrams. That is one I haven't personally seen. Battery photos were obtained from 2Pcs 15F20 22.5V Battery 412U15VS084 MN122 Carbon Zinc High Capacity ATLANTIC US