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    34" Crash Tender
    by Graham93 πŸ‡¬πŸ‡§ ( Leading Seaman)
    14

















    Comments
    2 months ago
    Flag
    Here is my Crash Tender together with the homemade 27MHz transmitter. Built in the early 1970s. The collage photo is from 45 years ago, sailing on the boating lake in Llanfairfechan, North Wales. Recently rescued from the garage covered in dust. Diesel replaced with brushless motor and on the water again. Now in dry dock for a major refit!


    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Martin555 ( Commander)
    Flag
    Hi,
    Nice.
    What a difference a little clean up makes.

    Martin.
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by RNinMunich ( Fleet Admiral)
    Flag
    Hi Graham,
    Neat! Like the TX as well, neatly doneπŸ‘
    Any chance of a look inside please?
    Did you also build the RX yourself?
    Good luck with the refit.
    Cheers, Doug 😎
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by robbob ( Captain)
    Flag
    This very much reminds me of my own 34" crash tender that I built at around the same time
    I had a series of photos of it along with some other models that I took on my 'Kodak Instamatic' camera but somewhere along the line they were lost which really saddens me 😭
    Nice job on the refurbishment πŸ‘πŸ‘
    Robbob.

    models
    camera
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Graham93 ( Leading Seaman)
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    Doug,
    Here are a couple of photos of the inside of the Tx. It used a PP9 battery, cheaper in those days than rechargeables! It was based on a circuit in an Application note published by Ferranti. I don't have the original receiver as it was unreliable and I replaced it with one built from an article in RCM&E, which I do have somewhere. I do have the case that I used for the original receiver though, it was a plastic soap dish (!) which I subsequently reused to house a servo tester based on a SN74121 which still works and I have started to use again.
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by RNinMunich ( Fleet Admiral)
    Flag
    Very nice Graham, well doneπŸ‘
    I think my basic problem was getting the coils right!
    My oscillator was erratic and unstable☹️
    I still have some of those 74121s, very useful chips.
    I also built a servo tester using it.πŸ˜‰
    Cheers, Doug
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by jbkiwi ( Lieutenant)
    Flag
    Was it McGregors who used to make RC kits in the 70s? Heathkit in the US did I think. We used to have a locally built 'Teletrol set here in the 70s which looked similar to yours but blue. It was a bit of a thing in those days to build a control set. What young person would bother today?
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Graham93 ( Leading Seaman)
    Flag
    I don’t remember McGregor offering kits in those days. They may have, but the cost would probably been out of my reach. There were companies who advertised in RCM&E who offered kits to build radio equipment, often based on articles in the mag.

    My 27MHz set was scratch built. I worked for a company at the time that had an engineering workshop that I could take advantage of at lunchtime. So the case was folded from aluminium sheet and then covered with red vinyl. The sticks were turned from Perspex. The circuit board was etched in the lab. Sadly I got a better job elsewhere and lost access to the workshop 😠

    radio equipment
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by swanee ( Able Seaman)
    Flag
    Yes it was McGregor that produced kits. I still have a 27meg transmitter and receiver tucked away somewhere. I also have a couple of Elmic rubber driven escapements too [I was aeromodelling in those days].

    27meg transmitter
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Brianaro ( Petty Officer 1st Class)
    Flag
    Hi
    Prior to 1973 and the introduction of VAT, Purchase Tax was applied in this country. Items that were sold incomplete, eg in kit form, were exempt from PT hence the popularity of white wood furniture that was unfinished and needed painting, or kitchen units without back panels, kit cars like the Lotus Elan or Seven etc. Upon joining the EU VAT replaced PT and the exemptions were different leading to the demise of the assembled or kit option

    wood furniture
    kit cars
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by RNinMunich ( Fleet Admiral)
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    Heathkit RC TX! 😎
    https://ia800705.us.archive.org/7/items/HeathkitGDA5713Chann...
    https://ia800705.us.archive.org/7/items/HeathkitGDA5713ChannelRCTransmitter/Heathkit%20GDA-57-1%203-Channel%20RC%20Transmitter.pdf
    πŸ”—
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by RNinMunich ( Fleet Admiral)
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    Heathkit 3 Ch RX and Servo circuitsπŸ˜‰
    😎
    https://archive.org/details/HeathkitGDA5723ChannelRCReceiverServo
    πŸ”—

    Ch RX
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Graham93 ( Leading Seaman)
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    Doug, interesting to see those old circuits with lots of discrete components. I have a Heathkit analogue voltmeter built in the 1960s by my Dad when he used to repair valve TV sets for friends and neighbours.


    I built a new servo tester yesterday. Photos show the new and old versions. 18 discrete components in the old one providing a multivibrator driving a 74121 monostable. Two components in the new one, a 10F220 PIC chip and a rotary encoder. Didn't really need another tester, but wanted to see how simple I could make it, in preparation for future developments.
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Martin555 ( Commander)
    Flag
    WOW! Modern day electronics.
    What a difference!

    Martin.
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    πŸ’¬ Re: 34" Crash Tender
    2 months ago by Westquay ( Commander)
    Flag
    I had a proportional set, made in Belvedere, Kent, called a Mini-Hex. 2 function, basically a Britisah built copy of the Kraft system with Kraft servos. Worked perfectly. I still have it. In 1971 it cost me 70 gns.!
    At today's values that would buy me a gorgeous, work-of-art, Jeti Duplex! Oh God, I wish!

    Martin

    Jeti Duplex
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