Model Boat Mayhem
Mess Deck: General Section => Model Boating => Topic started by: Perks842 on October 04, 2010, 05:27:39 am
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Hello all, Whats the best set up to convert power from one motor to two prop shafts? and where can these set ups be purchased from?
Thanks, Dan
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Can you supply a bit more information about the boat you want to fit it in.
With your username is it a Perkassa? If it is there have been several of these made on here, you might try the search facility.
Bob
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as bob says possibly a bit more information required but on my container ship i used belt drives which seems to work well enough and is reasonably simple to do and quiet running.
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as bob says possibly a bit more information required but on my container ship i used belt drives which seems to work well enough and is reasonably simple to do and quiet running.
I have never seen this setup, sounds very interesting would it be possible to add some photo's please.
Kind regards Dave.
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Was thinking of powering my fletcher class destroyer by 1 motor to save weight and power consumption really, was hoping it wasn't such a rare thing :P
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Can you supply a bit more information about the boat you want to fit it in.
With your username is it a Perkassa? If it is there have been several of these made on here, you might try the search facility.
Bob
O and no idea on the Perkassa route there
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Perks,
What props are you going to use as the Fletcher kit comes with handed props.
You will need to reverse the rotation of 1 shaft by including 1 extra cog on 1 side only.
A simpler way is to use pulleys on the motor and both shafts.
These can be sized to use neoprene "O" rings to transmit the power.
To reverse 1 shaft fit a slighter larger diameter "O" ring but used in a figure of 8 with the other straight.
Bob
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Perks,
What props are you going to use as the Fletcher kit comes with handed props.
You will need to reverse the rotation of 1 shaft by including 1 extra cog on 1 side only.
A simpler way is to use pulleys on the motor and both shafts.
These can be sized to use neoprene "O" rings to transmit the power.
To reverse 1 shaft fit a slighter larger diameter "O" ring but used in a figure of 8 with the other straight.
Bob
Thats what I had in mind with the belts, was just hoping there might be some sort of little chassis for it or frame work.
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Some plastic kits do have metal gearboxes, the 1/200 scale Yamato has 4 shaft output.
But these gearboxes tend to be very noisy and you would be lucky to find a box with the exact propshaft width.
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If you look on here in the Gallery you will see Dave Farrows installation in his Fletcher.
http://www.marksmodelbits.com/
Bob
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Thanks Bob, have already taken a look but like I said, wanted to safe power consumption and weight if the second motor.
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1 problem using 1 motor is that it has to overcome the frictional losses in the gearbox too.
Another way is to fit the motor to 1 shaft and fit 2 identical pulleys and use 1 shaft to power the other with the "O" ring in a figure of 8.
This way ensures you always have drive to 1 shaft.
Bob
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If you look on here in the Gallery you will see Dave Farrows installation in his Fletcher.
http://www.marksmodelbits.com/
Bob
Bob, Nice installation,any ideas how or if the Fletcher images can be saved.
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Ask Mark.
Dave has used exposed shafts and the kit props.
Bob
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Thank you :-))
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I would go with two motors, small with low rpm output, will be more efficient than a single motor driving two props, its the prop causing the amp draw not the motor.
GWS IPS DX2 Motor & Gearbox, about halfway down the page
http://www.micronradiocontrol.co.uk/motor_brushed.html
Will draw minimal current, I've run these on solar cells and 30 mm props. but I also use 3 of the motors by themselves in a 1/72 Snell boot for rocket ship speed :}
Nick
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thread no longer requires, thanks all
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I have never seen this setup, sounds very interesting would it be possible to add some photo's please.
Kind regards Dave.
hopefully the resized picture will load. this is the unit. i have tidied it up a bit by replaced the second hand brass hex and a few other imperfections since this photo. probably made it more complicated by using ball races from a R/C car and its certainly over engineered but i prefer it that way.
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maybe a slightly better photo. to give an idea of size, the motor is from a teleprinter (not the prettiest looking but incredibly powerful and quiet) is approx 45mm dia. x 100mm long. runs 2 x 40mm 3 blade props with virtually no increase in current draw from no load to full load.