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60watt28/05/2009 21:34:51
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253 forum posts
14 photos
Model
Voltage
NO LOAD
AT MAXIMUM EFFICIENCY
STALL
TORQUE
   
NOMINAL
Volts
SPEED
CURRENT
SPEED
CURRENT
TORQUE
OUTPUT
EFF
RPM
A
RPM
A
    
g - cm
W
%
-
mNm
RE - 540
6.0
CONSTANT
14000
1.00
10800
7.10
 254
28.1

66.0
  190
60watt28/05/2009 21:38:28
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253 forum posts
14 photos
Performance
Model M5-RS775-12
Operating v : 6v - 18v
Nominal v : 12v
No Load RPM : 7300
No Load A : 1.1A
Stall Torque 431.5 mN-m
Stall Current : 30A
Kt 14.4 mN-m/A
Kv : 608 rpm/V
Efficiency : 76.8%
RPM - Peak Eff : 7300
Torque - Peak Eff 82.6 mN-m
Current - Peak Eff : 5.7A

 
Physical
Weight : 12.4 oz (352g)
Length - for motor : 2.62 in (66.5mm)
Diameter (with flux ring) / Diameter : 1.85 in (47mm)
Diameter (no flux ring) / Width Across Flat : 1.66 in (42.2mm)
ShaftDiameter : 0.2 in (5mm)
Shaft Length : 0.3 in (7.6mm)
Mounting Screws (2)
M4

Edited By 60watt on 28/05/2009 21:46:26

Barry Foote28/05/2009 21:52:51
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161 forum posts
93 photos
Oh my......Confusion reigns.........Not having much knowledge of electronics all that means absolutely nothing to me, although I do understand the principle that the prop will slow the motor down so a gearing will increase it's speed...
60watt28/05/2009 23:32:31
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253 forum posts
14 photos
The figures say you need to run the  540 shaft up to 7,000RPM - 10,800RPM on 6 volt
A 775  requires 3600 to 5000 RPM  800 requires 2600 to 4290 rpm on 12 volt .
The lower figure is at maximum motor power and the upper RPM figure is at maximum efficiency.
They also show an 800 and 775 on 12 volt are like a 540 already geared 2.3:1 and 2:1

A 900,from memory, is 1,000 mNm stall torque,540 is 190mNm so the 900 is like a 540 on a  5.5:1 gear.
 
2000RPM figure for the 63mm is only an educated guess and if correct you can calculate the gear ratio  it would need maybe between 3:1 to 6:1.

You are quids in if you opt for a direct drive 775 and pick a prop to suit.
 
Edit
I spotted an error on the 775 data.-not my mistake.The speed at max eff. should be around 5000 RPM for the figures to tally.Copied it from here

 

Edited By 60watt on 28/05/2009 23:36:23

Barry Foote31/05/2009 15:14:14
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161 forum posts
93 photos
Onto some detail for a change. I have started to build the main superstructure, planked the bulkheads in the galley, made up a workbench and started the stove, which will be finished when I know what type it would be. Also made up a kitchen wall unit, which has to be painted white.

 


 

 

Edited By Barry Foote on 31/05/2009 15:15:18

Peter Fitness01/06/2009 01:35:59
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510 forum posts
215 photos
Looking good. What did you use for the cooktop, Barry?
 
Peter.
Barry Foote01/06/2009 07:49:32
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161 forum posts
93 photos
Peter,
1mm ply, carefully cut out. A coat of sanding sealer and gloss black. This will be followed by matt varnish to dull it down. The rest of the worktop is done with a product I hardly ever use.....plastic card..
Peter Fitness03/06/2009 05:21:06
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510 forum posts
215 photos
It looks good, Barry. Will it glow when you turn it on?
 
Like you, I haven't used plastic card / styrene sheet much either, apart from the Model Slipway kit of HMCC Sentinel. However, I believe it has possibilities in certain situations, such as deck superstructures, as it is very easy to obtain a good paint finish. Much easier than wood which requires much filling etc to hide the grain.
 
I am seriously considering using styrene sheet for all of my next project, an Armidale Class patrol boat of the Royal Australian Navy. I think it should give a good representation of a metal (aluminium) hull.
 
Peter.
Barry Foote03/06/2009 09:44:55
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161 forum posts
93 photos
Peter,

Only once did I make a complete model using plastic card and I totally lost interest in it, long before it was finished.......Never again...As for a glowing cooker range.....well now there is a thought!!

Barry 
Barry Foote20/06/2009 12:54:38
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161 forum posts
93 photos
A few more pictures to bring us up to date.

I have started attaching the rubbing strakes, very slowly to avoid splitting the wood. Also completed some of the galley detail. As little of this area will be seen on the finished model, there is no need to go over the top on detailing.




 
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