draw, thrust, and components
Re: draw, thrust, and components
Very informative post . My question is, if I am using DT 700 motors with 50 mm Robbe 3-bladed props, I shouldn't use a shroud or any kind of thruster tube set-up ? I might have to change my design if so.
Re: draw, thrust, and components
At my tests Graupner and Robbe propellers perform better without any kind of shroud.Kaplan style propellers perform better with a shroud .You can still use a larger diameter than propeller just for protection.Lost Bob wrote:Very informative post . My question is, if I am using DT 700 motors with 50 mm Robbe 3-bladed props, I shouldn't use a shroud or any kind of thruster tube set-up ? I might have to change my design if so.
Re: draw, thrust, and components
Hi hobbydude and Bubbles. Some interesting stuff there with the jet boats. I have gone with large clearance and long ducts. The duct length suits the present ROV layout, that is about all. I tend to agree with the points you make re the clearance. For nozzles to work properly the foil section of the Kort, Rice or other design had to be right. Also, the Kort nozzle (I've been curious about these for a while, and been reading up) is only good for low speeds, like tugboats, and most ROVs I guess. Dunno how good for reverse.
Olegodo: I think you should take a bit more credit. To me, your thruster design looks like a trolling motor (small electric outboard) prop with a Kort nozzle...
Olegodo: I think you should take a bit more credit. To me, your thruster design looks like a trolling motor (small electric outboard) prop with a Kort nozzle...
Re: draw, thrust, and components
@Bubbles
How much clearance do you think ? Would 1/2 " between prop and tube be enough, i.e. a 3" tube housing a 2" prop ?You can still use a larger diameter than propeller just for protection
Re: draw, thrust, and components
I believe 1/2 " is ok for protection .Lost Bob wrote:@BubblesHow much clearance do you think ? Would 1/2 " between prop and tube be enough, i.e. a 3" tube housing a 2" prop ?You can still use a larger diameter than propeller just for protection
Re: draw, thrust, and components
I receive the bluerobotics T100 thrusters and decide to give it a try with X3 control board.
I use a 4S battery and these are the results:
FORWARD
20% power 500gr. 0.42a
40% power 1500gr. 4.65a
50% power 2200gr. 6.7a
60% power 2800gr. 11.7a
80% power 4000gr. 22 a
REVERSE
20% power 170gr. 0.3a
40% power 780gr. 2.22a
50% power 1170gr. 3.84a
60% power 1650gr. 6.46a
80% power 2500gr. 13.84a
I didn't try 100% power since my ESC can handle up to 30a.
I use a 4S battery and these are the results:
FORWARD
20% power 500gr. 0.42a
40% power 1500gr. 4.65a
50% power 2200gr. 6.7a
60% power 2800gr. 11.7a
80% power 4000gr. 22 a
REVERSE
20% power 170gr. 0.3a
40% power 780gr. 2.22a
50% power 1170gr. 3.84a
60% power 1650gr. 6.46a
80% power 2500gr. 13.84a
I didn't try 100% power since my ESC can handle up to 30a.
Re: draw, thrust, and components
Beautiful stuff!
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Re: draw, thrust, and components
Is this right?
2500 grams= 5.511557 lbs of force.
If so, that's pretty freakin' powerful! You could power a rowboat with a few of those.
2500 grams= 5.511557 lbs of force.
If so, that's pretty freakin' powerful! You could power a rowboat with a few of those.
Re: draw, thrust, and components
Yes it is!!!!!a_shorething wrote:Is this right?
2500 grams= 5.511557 lbs of force.
If so, that's pretty freakin' powerful! You could power a rowboat with a few of those.