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Post by nm on Jun 25, 2009 7:54:46 GMT 1
There are no daft questions.
But there can be daft answers!
nm
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Post by Achtung!! on Jun 25, 2009 8:58:27 GMT 1
Well thats my forte!
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Post by popeye on Jun 25, 2009 10:25:53 GMT 1
a v-mixer (or v tail, because it has an input unit with 2 leads coming out like a v shape) is mainly used for model aircraft control. You plug in this electronic mixer between your receiver and servos for use in, for example, V-Tail, Flying Wing and Delta Wing models. It makes parallel and opposite mixing of 2 servo functions possible. Mix elevator and rudder for V-Tail models, or elevator and aileron for Delta and Flying Wing models. The mixer can also combine ailerons together for use as flaps or speed brakes. This means that when a left or right move command is given, both the rudder and ailerons (wing flaps) operate together to move the plane properly.
What it actually does is to take 2 radio control channels (A and B) at the input and produce 2 servo control outputs one of which is the sum of the 2 inputs (A+B) and the other is the difference (A-B).
For boat use this only works for a twin propellor system, with each propellor powered from its own motor and speed controller (i.e. you need 2 motors and 2 speed controllers).
The 2 channels are rudder control and speed control (in this case the 2 speed controllers are running from the single channel). The receiver channel that feeds the rudder servo needs to be split (use a "Y" servo lead splitter cable) so that it can both control the rudder servo and be fed into one of the inputs of the mixer. The speed control signal is fed into the other input of the mixer. The 2 outputs from the mixer go to the 2 speed controllers.
When a speed control signal is received, with no rudder movement, the signal is fed equally to the 2 speed controllers and the propellors will rotate at the same speed, ahead or astern, as directed by the transmitter speed joystick. When the rudder is moved away from its centre/neutral position, its signal moves the rudder as required but, in addition, the rudder signal is added to one of the speed control signals (A+B), causing the motor on that side to speed up, and subtracted from the other (A-B) causing the other motor to slow down (or go in reverse). If you have got the connections to the speed controllers correct (you'll soon find out if they are wrong !!), with the rudder to, say, port (turn left) the starboard propellor should speed up in the ahead direction and the port propellor slow down (or go into reverse) so that the boat is powered into the turn and will turn much quicker and sharper.
If the boat is stationary (i.e. the speed joystick is in the neutral position) when the rudder is moved away from the centre to left or right, then one motor should start in the ahead direction and the other will go astern at the same speed so that the boat should spin round without moving forward or backward (i.e. turn on its own axis).
I hope this helps. Incidently, I use such a mixer on my boat (I just have 2 powered props, the middle one freewheels) and it give very good manoeuvrability, very useful for running through course regattas, going round all the buoys.
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Post by Deleted on Jun 27, 2009 11:09:47 GMT 1
Markus you have mail.
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Post by Deleted on Jul 1, 2009 0:42:55 GMT 1
Would you still need 3 of the new esc's for 3 motor operation.
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Post by markus on Jul 1, 2009 6:12:50 GMT 1
Would you still need 3 of the new esc's for 3 motor operation. of course, they're just smaller - and they still work when the ship has sunk ;D markus
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Post by Achtung!! on Jul 8, 2009 8:43:25 GMT 1
Hi Markus
I have been ferreting away by candle light trying to sort out my definitive list of bits that I need. A shopping list so to speak.
What I have upto now is the two motor set and nearly four servos from Robert.
There fore I have come up with the following:
Nimh cells 9000 soldered together - 70 euros
Scale Rudders - 35 euros
Servo mounting - 10 euros
Drive set for the 6 small turrets - 80 euros
Its the next bit Im still not sure on - the speed controllors and Y cables. Which do you receommend for my two motr set up? Please advise as basically I will be ordering some parts at a time (money flow and all that) so looking to do it in three/four steps at a time and tick off as i go along.
Cheers
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Post by markus on Jul 15, 2009 10:43:08 GMT 1
sorry, just read your reply
any y-cable (only one needed for 2 motors) and any forward-reverse esc with at least 15amps capability is fine
markus
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Post by Deleted on Aug 28, 2009 12:14:47 GMT 1
I have a nicad battery pack, (for the hatchete wrx rc car) which is 7.2volt - 1600mah. The charger they supplied is 9v - 300mah, 2.7VA. Now can I use the charger to charge that battery and if so for how long, they didn't say in the instructions.
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Post by markus on Aug 28, 2009 13:41:16 GMT 1
I have a nicad battery pack, (for the hatchete wrx rc car) which is 7.2volt - 1600mah. The charger they supplied is 9v - 300mah, 2.7VA. Now can I use the charger to charge that battery and if so for how long, they didn't say in the instructions. yep, charger can be used rule-of-thumb for charging time: capacity divided by charging current multiplied by factor 1.2 1600 / 300 * 1.2 = 6.4 hours please keep an eye on the battery temperature - disconnect charger when battery becomes warm (warm=fully charged) markus
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Post by Deleted on Aug 29, 2009 8:20:26 GMT 1
Ahh ok, saved that rule of thumb, it could be useful.
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Post by matt on Aug 29, 2009 20:39:36 GMT 1
Hello Markus. Just a question. How many men have you displayed around your Bismarck??
Matt
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Post by popeye on Aug 29, 2009 21:22:30 GMT 1
I have just ordered my D-Cell NiMh (Nickel Metal Hydride) batteries to go in my homemade plastic tubing holder (see Popeye's Build). I got the most powerful ones around, some 12Ah each at 1.2v (they come as a button top, the same as a normal D-cell torch battery but heavier at 165gm - 5.8 ozs or with a solder tag at each end). They are USA $8.55 each (for 4 to 7), so 5 of then, for 6v, costs about $43 and the airmail delivery (4 to 14 days) is about $20, total about $63 or 50 Euro (www.batteryjunction.com). The all-up weight is about half that of a 12Ah lead acid battery.
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Post by markus on Aug 30, 2009 13:10:24 GMT 1
Hello Markus. Just a question. How many men have you displayed around your Bismarck?? Matt i placed 30 men, but some of those on the main deck got lost markus
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Post by matt on Aug 30, 2009 19:40:27 GMT 1
Thanks Markus. Forgot to ask how many men in one pack? Thanks
Matt
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