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34" Crash Tender
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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!
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Graham93
At today's values that would buy me a gorgeous, work-of-art, Jeti Duplex! Oh God, I wish!
Martin
What a difference!
Martin.
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.
😎
https://ia800705.us.archive.org/7/items/HeathkitGDA5713ChannelRCTransmitter/Heathkit%20GDA-57-1%203-Channel%20RC%20Transmitter.pdf
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
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 😠
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.😉
Cheers, 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.
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 👍👍
Robbob.
Neat! Like the TX as well, neatly done👍
Any chance of a look inside please?
Did you also build the RX yourself?
Good luck with the refit.
Cheers, Doug 😎
Nice.
What a difference a little clean up makes.
Martin.