Lego propeller boat moc

[Jumhansen]

Hello everyone,

i know that the summer is already gone, but maybe someone likes to what my video from the last project during the poolseason. 

The propeller - boat is powered by a buwizz 2,0 and a buggymotor, Propeller is the partnumber 89509 .

@Jurss Thank you for showing me that part.

[media]

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Enjoy.

Jumhansen

 

 

Edited December 4, 2022 by Jumhansen
Link edited

[Jurss]

Your welcome!

That pool is too small for real fun with Your build.

[Jumhansen]

@Jurss you are totally right ! 

[johnnym]

Nice one! I also have a total of four of the pontoons and they are still waiting to be used in a boat MOC, though with underwater propellers.

Yours looks even more effective than underwater propellers, so I might change my plans for my own MOC. The steering is a little slow for the speed of the vessel, me thinks. How about using a servo motor?

[Jumhansen]

@johnnymTHX !

You are right, the steering is a little bit slow, or the pool is too small. Maybe i try a servo motor next poolseason.

If you want to use this pontoons, seal them with tape (e.g. tesa-film), because they are not 100% tight.

I´ve made a lego trimaran with underwater propellers, using one buwizz and two buggymotors. This worked pretty good using
the tracked steering module in the buwizz app. You can find a video on my YT-chanel.

Jumhansen

[pow]

i like how minimal it looks (small builds quickly look overloaded). Great work!

BTW: i heard some crack noise when steering. Could something like that https://www.bricklink.com/v2/catalog/catalogitem.page?P=32054 (used as a slipping clutch) help with that noise?

[Jumhansen]

@powTHX !

I think the cracking noise belongs to the linear actuator.

Your bricklink link is a technic pin ?
Maybe that´s what you meant, the technic gear 24 with clutch ?

Next version maybe comes with a servo motor, next summer.

Jumhansen

[aeh5040]

That's very nicely done.  It's interesting what a big effect the rudders have.

[aFrInaTi0n]

3 minutes ago, aeh5040 said:

That's very nicely done.  It's interesting what a big effect the rudders have.

I think if they would be angled by 90°, they would even have a greater power/impact..

[Jumhansen]

@aeh5040 THX !

@aFrInaTi0nWhat do you mean with "angled by 90°" ?

Jumhansen

[aFrInaTi0n]

More attack surface of the wings should move more air when turned by 90° as shown in the picture - they will have higher resistance though. But I am also not sure if their even wingform will lead the air into the correct direction.

Couldn't test for myself, waiting for some of those expensive things to be delivered to mine... :D

Edited December 7, 2022 by aFrInaTi0n

[Jumhansen]

@aFrInaTi0nCool idea !

I never thought about turning the propellerblades by 90°.

I will try this.

That part is really expensive and rare.

 

Jumhansen

[aFrInaTi0n]

1 hour ago, Jumhansen said:

@aFrInaTi0nCool idea !

I never thought about turning the propellerblades by 90°.

I will try this.

That part is really expensive and rare.

 

Jumhansen

Recently found out that CaDA luckily offers them too for less money too. The originals will succeed the value of gold soon I guess... 😪

 

Keep us updated, will also work on one tech study with those propellers.. 😅

Edited December 8, 2022 by aFrInaTi0n

[Void_S]

On 12/7/2022 at 8:38 PM, aFrInaTi0n said:

More attack surface of the wings should move more air when turned by 90° as shown in the picture - they will have higher resistance though. But I am also not sure if their even wingform will lead the air into the correct direction.
Couldn't test for myself, waiting for some of those expensive things to be delivered to mine... :D

Or make some pitch control, like in helicopters...

[Jumhansen]

@aFrInaTi0n

I hope this propellerblades will reach the value of gold.  

Otherwise the panel nr. 5 or nr. 6 works also very nice. I´ve built a small
vehicle with thoose panels, just for a proof of concept. Thread is here in this forum.

Just build something with this curved panels or the bigger one´s.

 

I´am very excited what you will show us !

 

UPDATE:

The propeller on the left hand side is the original one, as shown in the video.
The propeller on the right hand side is the one, turned 90°, as you mentioned.
 

I will try these two setups 

Jumhansen 

 

 

[aFrInaTi0n]

Its just an idea I am interested in to test out if it will be possible... So I am no big fan of big announcement and releases, so here is the idea: Would like to see if its possible to create a working RC Motorglider (top triangle-wing).
Trial and error will eventually tell if turning the complete rotor or just angling the wing will be enough (the latter would be cooler, as it would be like the original motorgliders I have in mind, where the driver has the steering bar for the wing..)

Thing is: regular stund kites have no planar wings, so it maybe needed to just get some meters of ripstop polyester and form a planar surface - but this will include knitting etc pp. Unfortunately back in school I just made the course of knitting - so I may need to time to get the wing prepared or have to search for some skilled hands to do this for me.

And also the other propeller alignment could just create airflow outwards its diameter, but not into one axial direction - so looking forward what your testresults will look like. 🤩

 

@Void_S I am not that helicopter guy, but I guess implementing it to be stable enough for the big wingblades would make it really big (maybe not really useable) - but yes, that would be the best solution :D

Edited December 8, 2022 by aFrInaTi0n

[pow]

as we're in finetuning mode....

Is it perhaps a good idea to move the rotor blades outwards by one stud? So that there is a larger hypothetical total area over the entire rotor? It is easily possible with the current hub design.

[aFrInaTi0n]

8 minutes ago, pow said:

as we're in finetuning mode....

Is it perhaps a good idea to move the rotor blades outwards by one stud? So that there is a larger hypothetical total area over the entire rotor? It is easily possible with the current hub design.

In theory yes, but keep in mind that the outer end will travel more distance and gets faster therefore..

[pow]

28 minutes ago, aFrInaTi0n said:

In theory yes, but keep in mind that the outer end will travel more distance and gets faster therefore..

...which would make the build even faster or brakes the blades  ...

and if @Jumhansen also puts two hulls in a row forming a real catamaran this thing will become ridiculously fast and less jumpy on waves (length runs) or just a nightmare to drive

Edited December 8, 2022 by pow

[aFrInaTi0n]

The CaDa parts arrived... 15 pieces for ~11€..

So testing failures won't result in direct bankruptcy 😅

Edit: Omfg the blades arent pushing any air outwards of their diameter... even with a MK reciever it creates a huge amount of airflow.. xD

Edit2: Oh boy, in the fast output it easily leaches the battery empty with a steady current of 2 amps 🤯 at 100% - with the slower output it will go down to ~1.5 amps drain - still plenty, but I guess as its constantly working against the medium, this is expected :D

Edited December 10, 2022 by aFrInaTi0n

[Jumhansen]

@aFrInaTi0n

What will you do with 15 propellerblades ? 

If i have a few minutes left today i´ll test it with my anemometer.

Edited December 11, 2022 by Jumhansen

[aFrInaTi0n]

sheeeeeeeeeeeesh, expert tools :D

 

I think the weight of the construction will be the critical thing -> the longer the axle, the greater the axial forces (increased lever due to greate distance to the axlehole where it spins..).

Possible solution: Aluminium axles (but those are also prone to bend under higher loads or in the long run)

Also with the Voltage of the Buwizz3 instantly going down rapidly with this 2A constant load at the fast buggy output, it may not be feasible to mount even more blades (and therefore increase load even further because of more air-resistance).

I think the limit for one Buwizz will be 4 blades with the wide side shoveling air at the lower output (~1.5A drain, Buwizz barely able to deliver, but Voltage also may drop fast.) + due to the motors having constant load, they easily got warm (even with air-cooling :P).


Could you do the tests with both the blade configurations + with both of the buggies outputs? (also maybe having a look at the Voltage & Current @Buwizz App?). But don't feel rushed & if its too much tests also fine if you say "naahw" :)

Edited December 11, 2022 by aFrInaTi0n

[Jumhansen]

@aFrInaTi0n

Officially i use this anemometer for blower door tests, in this case it is also good for testing lego propellerblades. 

I have made videos of both configurations. I´m just cutting the vidoes and upload it to youtube.

But i´ve forgotten to display the voltage & currents in the buwizz app. 

So stay tuned, video is comming.

Jumhansen 

[aFrInaTi0n]

🤩🥰🥰🥰👌

[Jumhansen]

 

Here are the results 

Jumhansen