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3D Printed Prop and Kort Nozzle

[/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]The best thing that came from all of our testing is a 3D Printer version odone by Ole Hermann Godø. Download the files: Ole_Herman_God0_Thruster.7z

Drawing: 3D_Print_Prop_V1.pdf[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text][/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]Performance numbers in forward are:
12v
1A = 0,5kg – 1,1lb – 17,6oz
5A = 1,5kg – 3,3lb – 53oz
10A = 2,3kg – 5lb – 81oz
13A = 2,65kg – 5,8lb – 93,5oz
19A = 3,3kg – 7,3lb – 116oz (Max)

Reverse:
1A = 0,45kg – 1lb – 16oz
5A = 1,3kg – 2,8lb – 45,8oz
19A = 2,9kg – 6,4lb – 102oz (Max)[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][x_video_embed no_container=”false” type=”16:9″]

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ROV THRUSTER

3D printed thruster for hobby ROV. 3D printed parts. NTM Prop Drive 2836 750KV brushless motor.[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]

www.bluerobotics.com

[/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]The design Ole Hermann Godø created was inspired by the Blue Robotics Kickstarter which now has there products for sale at www.bluerobotics.com. Starting at $100, they are relatively expensive thrusters as compared to Ole Hermann Godø’s creation, but they are very good quality. The only possible flaw is the windings on the out runner motor have not been potted which leaves the windings exposed to abrasion from the sea-water.[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]

Thruster Prop Testing

Our starting point for testing will be to duplicated the OpenROV groups test done on the Rotor, 5-Blade: Delta-V 15
Part # EFLDF151 blade as a baseline. Then test additional blade to try and imporve on the amp-hour/thrust ratio achieved by OpenROV and HomeBuiltROV’s

Motors Used in Test Below:
HomeBuiltROVs: 750 gph bilge pump
OpenROV: 2213N 800Kv Brushless Motor

 

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Forward Reverse
Manuf Part Number Blades Diam
mm		 Pitch
mm		 Volts Amps Watts Thrust grams Grams
/Watts		 Amps Watts Thrust grams Grams
/Watts		 Source
Rule? Impeller 3 n/a n/a 12 2.80 33.60 n/a n/a HB ROV
Robbe ROB1471-72 3 50 42 12 6.00 72.00 817 11.35 5.50 66.00 635 9.62 HB ROV
Robbe ROB1464-65 3 60 45 12 6.50 78.00 680 8.72 6.30 75.60 363 4.80 HB ROV
Robbe ROB1487 3 60 Kort 45 12 6.40 76.80 680 8.85 6.00 72.00 363 5.04 HB ROV
X-Brand RA3007 2 35 ? 12 4.20 50.40 590 11.71 4.00 48.00 408 8.50 HB ROV
X-Brand RA3008 2 40 ? 12 5.20 62.40 726 11.63 5.00 60.00 499 8.32 HB ROV
X-Brand RA3009 2 45 ? 12 5.80 69.60 726 10.43 5.00 60.00 590 9.83 HB ROV
X-Brand RA3010 2 50 ? 12 6.10 73.20 771 10.53 6.00 72.00 635 8.82 HB ROV
Graupner GR1 124 2 35 ? 12 2.15 25.80 408 15.81 2.00 24.00 272 11.33 HB ROV
Graupner GR1 128 2 45 ? 12 6.00 72.00 680 9.44 5.80 69.60 454 6.52 HB ROV
Graupner GR230840 3 40 ? 12 2.65 31.80 590 18.55 1.95 23.40 136 5.81 HB ROV
Graupner GR230850 3 50 ? 12 4.45 53.40 998 18.69 3.65 43.80 272 6.21 HB ROV
Graupner GR230850 4 50 ? 12 3.80 45.60 680 14.91 3.10 37.20 363 9.76 HB ROV
Eflight Delta V-15 5 69

?

 11 6.00 66.00 480 7.27 OpenROV
Graupner 2308.65 3 65 34 11 6.00 66.00 1100 16.67 OpenROV
Custom 65mm x  24mm 3 65 24 12 10 120 454 3.78 SVSeeker
Eflight Delta V-15 5 69 ? 12 9.91 119 964 8.10 10.58 127 794 6.25 SVSeeker
Eflight Delta V-15
63mm w/Shroud		 5 63 ? 12 10.8 129.6 1446 11.16 10.8 129.6 1111 8.57 SVSeeker
Eflight Delta V-15
w/Stock Duct		 5 69 ? 12 10 120 1360 11.33 10 120 737 6.14 SVSeeker
Graupner 2308/65 3 65 34 12 9.5 114 1616 14.18 9.75 117 694 5.93 SVSeeker

[/cs_text][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]HomeBuiltROV’s Testing:
http://www.homebuiltrovs.com/mayfair750test.html

OpenROV Testing:
Test Stand http://openrov.com/forum/topics/thruster-testing-stand
Test Results http://openrov.com/profiles/blogs/preliminary-propeller-efficiency-testing[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]

Rotor, 5-Blade: Delta-V 15
Part # EFLDF151 $7.99

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Graupner 2308.65 is 200% more
efficient than the 5-Blade: Delta-V 15 at
66w and when the V15 is not in a
shourd.

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OpenROV Parts
2213N 800Kv Brushless Motor
3mm shaft, Outrunner Max 9.5A 11V

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OpenROV Parts
EZRUN 18A Brushless ESC $24
Output: Continuous 18A, 2-3S LiPo

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OpenROV Parts

2213N 800Kv Brushless Motor 3mm shaft, Outrunner Max 9.5A 11V http://www.hobbyking.com/hobbyking/store/__8622__2213N_800Kv_Brushless_Motor.html

EZRUN 18A Brushless ESC Output: Continuous 18A, 2-3S LiPo
http://www.hobbypartz.com/ezrun-18a-v2-esc-for-rc-car.html

Propeller Selection

We made an attempt to CNC mill our own propellers from Delrin plastic. The approach was simple, take what we know about 27″ diameter 400 rpm boat propellers and apply it to 2.5″ diameter, 6000 rpm propellers.[/cs_text][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]

68 mm diameter, 24 mm pitch, ROV propeller

[/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text][/cs_text][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][x_video_embed no_container=”false” type=”16:9″][/x_video_embed][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]In actually testing this blade preformed very poorly, only generating 16 oz, 454 grams of thrust with 120 watts. The motor was generating 4,500 to 5,500 rpm as expected so we believe the a good deal of the problem lies in the thickness of the blades, which are 2.25mm thick compared to .7mm of the very efficient Graupner 2308/65 prop or the .9mm blade of the Delta-V 15 fan blade.

Graupner 2308.65 Prop Suppliers:
www.wheelspinmodels.co.uk
www.cornwallmodelboats.co.uk[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text][/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]After taking our various motors apart we found that all but the HobbyKing Donkey use little bearing on both ends of the coils. The HobbyKing Donkey has a single brass bearing. We like that design because it provides no air pocket that will compress and allow seawater to pass through the bearing. So oil in the bearing will stay in place longer and collect less debris.

[/cs_text][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][x_video_embed no_container=”false” type=”16:9″][/x_video_embed][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][x_video_embed no_container=”false” type=”16:9″][/x_video_embed][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][x_video_embed no_container=”false” type=”16:9″][/x_video_embed][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]

Thermal epoxy for potting the coils.

[/cs_text][/cs_column][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/2″ style=”padding: 0px;”][cs_text]https://www.youtube.com/watch?v=RIOuPMg99GA

Other Motor Options
Gear head motors: http://www.pololu.com/category/51/pololu-metal-gearmotors
Gimbal Drive Motors: http://hobbyking.com.au/hobbyking/store/__976__973__FPV_Telemetry-Gimbal_Motors.html
Servo Motors: http://www.servocity.com/html/planetary_gearbox.html
Ceramic bearings: http://www.bocabearings.com

Prop Chart: http://www.funrcboats.com/prop_chart1.htm
Prop Calculator: http://www.radiocontrolinfo.com/RCcalculator/BoatCalculator.php
Servo Gears: http://www.servocity.com[/cs_text][/cs_column][/cs_row][/cs_section][/cs_content]