๐ University Project - Hull Fabrication So Far
11 years ago by
๐ฌ๐ง SandyDola92 (
Able Seaman)
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HI guys, hope you all had a good Christmas and New Year!
Thought I would upload a few photos of the hull I formed over the holidays for my university project for you to see and give tips on etc. If you so wish.
For the project, we are asked to design and build our own RC RUDDERLESS BOAT. It was decided to use foam as the material for the hull as It Is cheap (we are students after all), and also very easy to mold to the desired shape.
A catamaran design was opted for also as we felt we would gain not only more stability, but load bearing and component space on the deck.
The hull took me around 2 days to complete, however this was mainly due to my sometimes unhealthy need for a cuppa.
The hull was fabricated In 2 sections: top, and bottom (consisting of the two pods). The tools used were: Hacksaw, hacksaw blade, Stanley blade, chisel, file, drill with an M10 drill-bit, and sandpaper/sanding-block.
The two sections are yet to be glued together. An acrylic-based coating Is to be donned, also a coat of paint for added protection against the water.
My one major concern Is water Ingress to the two motor housings via the hole where the shaft will protrude. How can I solve this problem?
Thanks again for all the help!
Boat dimensions are approx as follows - L 350mm; B 225mm; D 120mm.
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๐ Hull Materials
12 years ago by
๐ฌ๐ง SandyDola92 (
Able Seaman)
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Yes, power by battery. We just submitted a final Product Design Specification (PDS) for our boat and have included the battery price in it: looking to spend up to ยฃ15 on batteries.
Now we can start sketching up concepts and doing more detailed calculations.
Our next step will be to design and fabricate the hull, which will be paramount to the projects' success.
The Kortz nozzles seem like a great idea, however after discussion with our adviser, he feels it would defeat the purpose of directional control purely from the props.
We will be controlling it via normal RC control, however we feel if we have time that control via an everyday controller such as a WiI remote would be pretty smart and not too hard to accomplish ๐ !
Thanks for all this help by the way, it's giving us a far clearer insight as to how we should go about the project ๐ !
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๐ Hull Materials
12 years ago by
๐ฌ๐ง SandyDola92 (
Able Seaman)
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The slalom is really just to show off just how good the directional control of the boat is without the use of a rudder. The slalom course will be set by ourselves based on how well we think the boat will perform.
We had a toss-up over using a more stable option of hull (catamaran) and a more nimble hull type (single hull). We opted for the catamaran style hull as we felt the stability of the boat was more Important than the maneouverability. We saw videos of the previous years effort and felt we would like the boat to go a lot faster than theirs.
The plans so far are to have:
-Catamaran style hull
-Length of boat to be around 350-400mm
-Have two motors each connected to a prop. Motors ideally to be reversible to have much better turning action.
-To have a load bearing capability. So a small loading bay would need to be present.
-Boat to be controlled by WiI style remote if possible.
-Operating time of 15 minutes
-Operated from a distance of 7.5m
The kort nozzle idea looks great, how easy would it be to Implement into the design?
I'll have a look at the different motors on offer. We set out a budget below as follows:
-Motors ยฃ30 - ยฃ40
-Control ยฃ30 - ยฃ40
-Props ยฃ10 - ยฃ15
-Hull ยฃ10 - ยฃ20
Very Impressive pictures of the tug boat you have, looks like you spent a great amount of time on it, looks brilliant ๐ !!
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๐ Hull Materials
12 years ago by
๐ฌ๐ง SandyDola92 (
Able Seaman)
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Hi, Dave, Thanks for the reply!
Here is the project outline that was given to us, hopefully this will give you a better perspective:
"This project will design, build and demonstrate a rudderless boat where directional control will be enabled through a twin-screw system. Conventional boats use a rudder to control the vehicle heading, in this project the speed of each screw will be controlled independently to alter the vehicle heading.
The boat should be entirely self-contained and able to handle scaled WMO Sea State 4 conditions. WMO Sea State 4 is a moderate swell with wave heights of 1.25 to 2.5 metres, thus if the boat is a 10th scale model it should be able to handle a swell of 12.5 ' 25 cm (this detail is open to negotiation). The boat should also be able to manoeuvre around a slalom course."
When concerning restrictions, the test tank at the University is approx 25-30m in length and approx 1.5m in width. However, it would be nice to be able to achieve a design whereby testing could take place at a bigger location (preferably the River Clyde!).
As Electrical and Mechanical students, we do not know much about the construction or the design of boats as such, so it's a challenging project but a very interesting one at that! I'm glad that I was allocated this project ahead of others such as a motorcycle, hovercraft, and helicopter.
Thanks again!
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๐ Hull Materials
12 years ago by
๐ฌ๐ง SandyDola92 (
Able Seaman)
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HI guys, just posting regarding a group project I am Involved In!
I am currently studying MEng Electrical and Mechanical Engineering at Strathclyde University and In my 3rd year.
We have been tasked this year with building a remote controlled rudderless boat on a budget of ยฃ100.
We have decided on a catamaran style design, and we feel we should opt for a foam based hull design, with It to be epoxied at a later date.
Any help regarding the topic would be much appreciated!
Cheers guys, all the best!
Alexander Morrison.
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