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Post by markus on Feb 2, 2008 12:08:13 GMT 1
use this space for any comments, questions or criticism...
markus
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Post by swanrail on Feb 2, 2008 13:31:49 GMT 1
So that is where it went - stop thief!!!!!
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Post by markus on Feb 2, 2008 15:59:14 GMT 1
sorry, don - couldn't resist...  markus |
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Post by Deleted on Feb 5, 2008 10:18:36 GMT 1
umm you left out Lithium Ion batteries or would they be even worse than the ones you listed ?
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Post by markus on Feb 5, 2008 12:20:49 GMT 1
umm you left out Lithium Ion batteries or would they be even worse than the ones you listed ? lithium ion batteries are similar to lithium polymer cells, but Li Ion cells lose 10-30% of their capacity per year (irreversible), depending on discharge current drain and general treatment so using them for our purposes won't be a good idea.. this kind of cell can be found in mobile phones, laptops, ... markus |
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Post by Mark on Feb 5, 2008 12:49:39 GMT 1
Just a comment on the weight of cells. Markus has said that high weight is a disadvantage of lead-acid batteries, and light weight is an advantage of LiPo's. Personally I would say that having a heavy battery is an advantage in our case, as we will need extra weight as ballast anyway. Might as well have the weight doing something useful !!
From my understanding, NiMh cells are a development of NiCad's and have similar characteristics. They have a higher capacity and no memory effect, so are generally considered superior. More expensive than NiCads of course, but you don't get aught for naught as they say.
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Post by Deleted on Feb 5, 2008 12:58:46 GMT 1
The 2 NiMh batteries I have don't hold their charge for very long.  Luckily the rechargable alkaline AA cells I have do hold their charge for a decent length of time.  |
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Post by markus on Feb 5, 2008 14:36:05 GMT 1
Just a comment on the weight of cells. Markus has said that high weight is a disadvantage of lead-acid batteries, and light weight is an advantage of LiPo's. Personally I would say that having a heavy battery is an advantage in our case, as we will need extra weight as ballast anyway. Might as well have the weight doing something useful !! you're right, in our case the cell's weight is an advantage - i use my cells as ballast too with 'disadvantage' i meant the weight of a lead battery compared to its capacity - Lipo's with the same weight have 10 times more capacity than a lead battery... markus |
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Post by steamboatbob on Feb 8, 2008 10:17:34 GMT 1
Hi guys
In the Battery department i went a little overboard a got a motorbike battery for a postie bike (all aussies should know that )
basically it is a gell cell 12Vbattery 2.2AH 180mm * 60mm * 35mm (LWD).
it fits perfectly into the hull with loads of room to spare for everything else and only weighs 800grams
I am running the 3 motor setup and ran them for 4 hours straight before the battery ran out of juice so my mind is definately made up in relation to this
;D ;D ;D
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Post by steamboatbob on Feb 8, 2008 10:19:20 GMT 1
oh yeah in australia i got the battery from battery world.
thaught i'd get that in first
;D
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Post by markus on Feb 8, 2008 12:45:28 GMT 1
Hi guys In the Battery department i went a little overboard a got a motorbike battery for a postie bike (all aussies should know that ) basically it is a gell cell 12Vbattery 2.2AH 180mm * 60mm * 35mm (LWD). it fits perfectly into the hull with loads of room to spare for everything else and only weighs 800grams I am running the 3 motor setup and ran them for 4 hours straight before the battery ran out of juice so my mind is definately made up in relation to this ;D ;D ;D 4 hours ? i presume the motors ran without any load, right ? current drain with props in the water is 5-10 times higher which results in 10-15 times shorter running time... markus |
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Post by eric on Feb 9, 2008 0:22:01 GMT 1
Markus, I know I am revealing my total lack of knowledge of R/C here, but I can see that there seems be some sort of wiring board fitted in the hull of most builds, with conectors on it......erm......what is this for, is it a main board for all the extras such as rotating turrets etc, and do I need to construct one?
I shall only be R/C controlling the two motors, nothing else.
Feeling like a numpty here!!
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Post by markus on Feb 9, 2008 9:08:39 GMT 1
Markus, I know I am revealing my total lack of knowledge of R/C here, but I can see that there seems be some sort of wiring board fitted in the hull of most builds, with conectors on it......erm......what is this for, is it a main board for all the extras such as rotating turrets etc, and do I need to construct one? I shall only be R/C controlling the two motors, nothing else. Feeling like a numpty here!! these wiring boards are for 'distributing' the voltages, partly with fuses on it (as seen in viking's model). also the complete wiring looks much more tidy if all wires are connected to a wiring board as if they were just soldered together... these terminal boards make it easier to get access to the circuits for later upgrading with illumination, smoke generators, and so on. these boards are nice, but not essential... markus |
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Post by eric on Feb 9, 2008 18:07:15 GMT 1
Ah, thanks Markus!
My natural instict is to keep things as simple as possible for myself, especially when I don't know what I'm doing!!!
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Post by steamboatbob on Feb 15, 2008 6:43:17 GMT 1
4 hours ? i presume the motors ran without any load, right ?
current drain with props in the water is 5-10 times higher which results in 10-15 times shorter running time...
markus
no mate i had them under simulaed load LOL in bath mounted on frame
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Luckily the rechargable alkaline AA cells I have do hold their charge for a decent length of time. 
