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Post by swanrail on Jun 26, 2007 18:40:36 GMT 1
Thanks Marcus, it is a bit of a mystery, as my servo is also 40mm! With the deck in place above it, I have 6mm clearance between the top of the servo arm and the underside of the deck planking. Without the 15mm cut out (which gives about 2mm clearance under, and I can just see the top of the prop shaft), this would not have been possible.
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Post by markus on Jun 26, 2007 21:16:06 GMT 1
Thanks Marcus, it is a bit of a mystery, as my servo is also 40mm! With the deck in place above it, I have 6mm clearance between the top of the servo arm and the underside of the deck planking. Without the 15mm cut out (which gives about 2mm clearance under, and I can just see the top of the prop shaft), this would not have been possible. maybe i have glued a bit more planks on the frames ?? (have less than 6mm between servo arm and deck) but your servo fits under the deck - so everything is alright markus
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Post by bob on Jun 29, 2007 13:58:30 GMT 1
Hi all, I have just received my three motor kit from Markus. I ordered them by post last friday and now have them in front of me. First a big thanks markus. Second i am extremely pleased with the quality of the goods received. I will look forward to having a trial fit over the weekend. I modified my Hull after the planking had been fitted using markus and swanrails guides and very little adjustment is required now for the motors to fit. Thanks again guys.
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Post by swanrail on Jul 2, 2007 13:33:05 GMT 1
I have posted under "ANTON" information of how I have fitted a servo to allow radio control of that turret.
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Post by markus on Jul 8, 2007 10:22:04 GMT 1
don asked me for information about the offered cells and what kind of charger should be used. i use a 230V NiCd/NiMh fast charger, adjustable to 1 or 2A charging current with delta-peak-switchoff. this charger can charge almost any kind of cells. charging time for the 9000mAh cells is approx. 6 hours at 2A charging current my charger isn't sold anymore, but found a quite similar charger. this one is additionally capable of discharging cells. if desired i can order this charger for 35 euro for those who order drive sets, but note you'll need a mains plug adaptor to make this carger fit into UK mains sockets. here the data sheets:
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Post by swanrail on Jul 8, 2007 23:02:58 GMT 1
Thanks Markus, but unfortunately the print has not come out very well, and cannot be read properly when printed. Would it be possible to send a higher definition copy by a file link please. Don
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Post by markus on Jul 9, 2007 18:29:06 GMT 1
Thanks Markus, but unfortunately the print has not come out very well, and cannot be read properly when printed. Would it be possible to send a higher definition copy by a file link please. Don sent you the charger's sheets in higher def via email, too large to post here if you buy a fast charger yourself keep in mind not to load the cells with current exceeding 1A when loading for the first time. after 1-2 charge/discharge cycles fast charge with a max. of 3A is no problem. fast charging from the beginning may result in weak cells with a short lifetime. it's just like running in a new engine (drove very calm with my new motorbike.......until that porsche 911 tried to overtake me ;D ;D) markus
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Post by markus on Jul 12, 2007 18:25:21 GMT 1
hi don! think it's better to post the data sheets for those sealed lead acid batteries in this thread instead of "turret dora" these batteries mustn't be discharged in less than 1 hour. (or with a max. current of approx. 3A) full capacity of those batteries is only given with 20h-discharge at very small current, higher currents result in minimal capacity and (after several cycles) damaged battery with 3 motors and several servos a current of 10-15A, depending of the used props, is a realistic value. so you'll receive a running time of only 10min.(approx.) with 3 motors that's why i suggested using NiMh cells with high current capability. 5 of them have 800 grammes, 100 more than the lead battery. look at the 'high rate discharge' diagram of those NiMh cells, these allow you a 60 min. time of '1C' discharge (9A) before the cell reaches a critical voltage level of 1,0 volts. higher discharge rates (max. 20A) only result in shorter running time, not in a damaged cell if you want a cheaper method of charging them simply use a universal power supply to plug in the mains socket. these are cheap, but you have to be careful when charging. you have to diconnect the charger when cells become warm or the charging current rises.. last but not least: round cells mounted 'in line' in the middle of the hull provide a lower center of gravity than a cubic battery. this will make our ship more stable in the water....
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Post by david on Jul 13, 2007 16:56:32 GMT 1
Hi Markus, My package of r/c bits arrived safely this morning, beautifully packed; many, many thanks, I'm really delighted, you've got some serious karma coming in your direction! Thanks again for all the time and effort you've been putting in to helping us benighted Brits out of the r/c labyrinth. Hachette should take you on as a consultant. Best wishes, David.
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Post by Mark on Jul 15, 2007 15:28:18 GMT 1
Hi Markus, I was just wondering if you had any spec sheets for the motors you supply. In particular any efficiency curves, although I might be being rather optimistic - they may not even exist.
Thanks Mark
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Post by markus on Jul 15, 2007 15:46:13 GMT 1
Hi Markus, I was just wondering if you had any spec sheets for the motors you supply. In particular any efficiency curves, although I might be being rather optimistic - they may not even exist. Thanks Mark this is from the manufacturer's homepage, if i find a better data sheet i'll post it here markus
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Post by david on Jul 15, 2007 22:53:23 GMT 1
Hi Markus, Studying your image on p.3 showing the position of the 5-piece motor mount, the axis of the central motor appears to sit closer to the keel plate than does mine, even with the 2-degree wedge that is shaved from the bottom. If I look back along the pre-formed prop-shaft holes in ribs 13A and 39A (or slide the outer prop-shafts in place), they appear to be centred on a point which is about approximately 5mm below the motor axis. Should I trust the Hachette prop-shaft positions/angles? Please could you give me dimension from the keel plate up to the central motor axis on your model; I'm guessing that it should be about 14mm? Many thanks, David.
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Post by Mark on Jul 16, 2007 10:42:20 GMT 1
Hi Markus,
Thanks for that - it looks like a good choice. 72% effeciency is pretty good for a small motor. It's just a shame they don't tell us what rpm or load that is.
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Post by markus on Jul 16, 2007 11:37:27 GMT 1
Hi Markus, Studying your image on p.3 showing the position of the 5-piece motor mount, the axis of the central motor appears to sit closer to the keel plate than does mine, even with the 2-degree wedge that is shaved from the bottom. If I look back along the pre-formed prop-shaft holes in ribs 13A and 39A (or slide the outer prop-shafts in place), they appear to be centred on a point which is about approximately 5mm below the motor axis. Should I trust the Hachette prop-shaft positions/angles? Please could you give me dimension from the keel plate up to the central motor axis on your model; I'm guessing that it should be about 14mm? Many thanks, David. yes, middle of motor axis is exactly 14mm above the keel plate i got these 14mm by modifying the motor bracket like i posted some pages before (red marked lines in pic of bracket) markus
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Post by valleydweller on Jul 16, 2007 12:09:55 GMT 1
Hi Markus, Just a few quick questions, I'm very interested in getting the 3 motor setup from you, but as I have no idea with what is all needed what is the total cost everything I need? (so that I can start putting away the money now ) Also what is the latest stage that I can put the motors in by? (I've made a few modifications as per your insructions and I'll be posting photos later today so that you can see if I've done it right) Thanks Dean
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