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    Reversing Field-Wound motors
    Seems reasonable Dodgy๐Ÿ‘ Got loads of Op Amps in the stash and some suitable FETs and 15A
    coming today. So I'll be 'avin a bash shortly. Doug
    1 month ago by RNinMunich
    Battery backup
    Just kiddin' Rob ๐Ÿ˜ Although, a vague idea how to raise the flag is trying to hide behind my last few grey cells๐Ÿค“ Got an old home made winch driver kicking about to use for some trials. Just ordered a batch of ICs,
    , and selection of MOSFETs to play with! So if you see puffs of black smoke and hear loud swearing, in German and English, coming out of the SSE you'll know who it is ๐Ÿ˜ฎ๐Ÿ˜‰ Four way (All Round) flasher unit prototype is done and tested. If I have time I'll put up some vid and scope pics of the tests. Built it while experimenting with improving the brightness of Haig's (Reilly4) strobe unit for his patrol boat. Next up is the comparator / switch trigger. Tricky bit is setting a stable reference threshold voltage - retires to Man Cave scratching head! Have an idea so have ordered a few chips to test it. Damn, have I still got the right Zeners in my stash!?๐Ÿ˜ฎ The actual switching board is the 'easy' bit! I've been wondering about the current you guys are thinking of switching! Any thoughts on that? The higher you go the more expensive the power switching elements get. ๐Ÿค” So maybe a smaller, lower voltage 'Get me home' battery is the answer, especially if space and weight margin is limited. I've ordered some 'stuff' to cope with around 10 to 15A max, more than enough for most scale boats / ships I think. The speed merchants would have to dig deeper in their pockets! Any and all inputs on this welcome Gents (and Ladies Nerys๐Ÿ˜‰) Cheers, Doug ๐Ÿ˜Ž
    1 month ago by RNinMunich
    Fairmile c class maiden voyage
    Sounds like you need to have a dedicated TX for the boat. I had a similar problem as I fly planes also. I bought a Hobby King HK6s mode 1 which is a basic 6CH but is easy to convert to twin throttles for boats (I have 2,- 1 for smaller planes and 1 for boats + a 6x, 9x and 2 9XRs). Makes life a whole lot simpler not having to use
    and switches for motors. The other TX is the Fly Sky 9X (Turnigy 9X, IMax 9X) which has more switches and functions (plus easy to find extra RXs outside HK,- 3ch, 4ch, 6ch,which suit) or if you want overkill, a TGY 9XR pro and JR module, which has everything you will NEVER need on a boat . Maybe you could use a program to pulse lights, (I have it lowering the flaps on my Cub in 2 stages in small steps /pulses and slow stepless up for eg,) or perhaps have the center motor only coming in over 1/2 throttle through a separate RX,- options are endless. I think the HK 6s is the best if you just need a 6CH or the 9X for more features. You can use the rotary switch (6s) through a Sky RC remote switch (eg) to turn on lights etc plus the toggle sw for another function. Just depends on the $$ really Not sure if you are using Lipos, brushed or brushless setup but either way sounds like 2x 3s 3000mah 20c lipos should work, especially if your motors are brushed 12v , also maybe try reducing the prop pitch or diam to take a bit of load off the battery/s. Depends obviously on a number of things such as space, motor type (no of poles, KV, size etc), boat weight, battery type and capacity/discharge rate etc. Lipos are by far the best option for powering models.
    2 months ago by jbkiwi
    LED Lighting tip
    Hi Martin, There's a saying over here amongst ship model builders, which translated means "Ship modellers will collect and save anything that won't start to stink after a few days!"๐Ÿ˜‰ I do the same as you with old video recorders, PCs, dead garden solar lamps etc etc. Great sources for motors, LEDs, power supplies, fans, connectors, ribbon cables, cogs n pulleys ..... I also browse around the flea markets here; great sources for odd bits n pieces. Have found boxes of assorted cog wheels and pulleys, once even a whole tray of miniature 5V
    . Which I used for a home made controllable switchboard in my destroyer. See pics! Carry on recycling๐Ÿ‘ Cheers, Doug
    2 months ago by RNinMunich
    Re: Z-39 German WW2 Destroyer
    Well I'm damned! That's exactly how my HMS Hotspur started out when I was 15! 52 years ago, Tempus Fugit ๐Ÿค” Based on the old 1/600 Airfix kit! Back then no digital micros, PCs, Internet or 3D techโ˜น๏ธ I used calipers, a crude plastic micrometer, Dad's steel rule (half mm and 1/64th scales) and a slide rule. Drew the plans at 1/72 on an 'endless' printer roll Dad brought from the RAF Cosford Tech Training School, where he was chief syllabus writer for the Radar Tech courses. Much much later (32 years ago) I made my own decoder board with
    to switch the lighting, smoke and horn circuits. All operated from one channel at the TX. Servo mounted micro switches provide for two further functions. Looking forward to your sketches / photos very much๐Ÿ‘ For my turrets I used one servo reduction gear and a pulley system to increase the 'firing arc' to ~270ยฐ. The whole shebang is mounted underneath the aft deck section so all comes out together for servicing. Think I'd better continue this in 'Retro Build Blog'!๐Ÿ˜ฎ Cheers, Doug ๐Ÿ˜Ž
    3 months ago by RNinMunich

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