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weswelden
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Join Date: Oct 2014
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DC Motor

10/29/2014 10:08 PM

size of propeller and dc motor to move a 15 pound submarine 1 mph
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SolarEagle
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#1

Re: dc motor

10/29/2014 10:31 PM

http://www.ebay.com/itm/VINTAGE-1980s-RADIO-CONTROL-SUBMARINE-RC-SUB-with-RADIO-CASE-/191391426174

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SolarEagle
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#2
In reply to #1

Re: dc motor

10/29/2014 10:54 PM

Here's a good instructional free ebook....

http://www.subcommittee.com/phpBB3/viewtopic.php?f=21&t=11183

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lyn
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#3

Re: dc motor

10/29/2014 11:12 PM

size of propeller: depends on motor.

dc motor: depends on prop.

I'd go to some modeling forums, because this ain't it.
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

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#4

Re: dc motor

10/30/2014 12:22 AM

Depends on the shape of the submarine, among other factors.

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old salt
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#5

Re: DC Motor

10/30/2014 11:17 PM

How many blades on the prop? 2, 3, 4, 5, 6, 8, 10 or more? What is it's diameter and angle of the blades? What is the speed of the motor and does it have any reduction gearing on the shaft? What size/shape of the sail? Actual torpedo tubes or just simulated? Will it submerge and surface or just float on the surface? Any deck mounted compartments for deployment of Seals and their supplies? If so what size, shape and configuration? Is there any unique requirements such as low noise when submerged to avoid surface sonar? Where is the power storage area (batteries) located? What is the draft, L.O.A.. L.W.L., surfaced draft, beam and maximum operating depth? What are the maximum angles of submerging and surfacing? What size and configuration of the rudder(s). What size, location and shape of the horizontal fins? Will these have ailerons on them? Is the 1 mph the surfaced or submerged speed? How many Bubble Heads on board?

Need more information!

Good Luck, Old Salt

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IQ
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Join Date: Feb 2013
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#6

Re: DC Motor

10/31/2014 5:35 AM

Go down to your local hobby shop and match a motor to a speed controller and match the combination to a prop.

RPM PITCH SPEED = ----- X ----- X ( 1- (SLIP/100) ) RATIO C

Where:

  • RPM the crankcase speed in revolutions-per-minute.
  • RATIO lower unit gear reduction ratio; the number of revolutions of the crankshaft to produce one revolution of the prop shaft.
  • PITCH blade pitch of prop in inches.
  • SLIP a percentage of propeller performance. Entered either as a decimal or a whole number
  • SPEED the boat speed in MPH.
  • C A constant to convert MPH to inches

Look up prop calculators in Google.
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IQ
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#9
In reply to #6

Re: DC Motor

11/01/2014 3:57 PM

My apologies on that formula. When I posted the formula it was correct. In posting, the clever system has changed it to utter rubbish.
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IQ
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#7

Re: DC Motor

10/31/2014 6:58 AM
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67model
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#8

Re: DC Motor

11/01/2014 1:34 PM

Just a hint.... I have not tried it, assuming neutral bouyancy :-

Power (watts) = 0.5 x drag coefficient x water density x cross section area x velocity cubed x propellor efficiency.

Must stick to metres, kilograms and second units. Isambard Kingdom Brunel got near 90% propellor efficiency on "Great Britain in 1843 and cars have drag coeff about 0.5.

Its all subject to a great effect of details but it gives a ball park figure.
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67model (1); IQ (3); lyn (1); old salt (1); SolarEagle (2); Tornado (1)

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