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« on: October 25, 2013, 06:12:17 PM »
topalle
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Hello everyone
I could not find any topic relating to basics of boat building so, I took the initiative...

In this topic, I would like advice from boat builders about basics of scratch building boats and ships whith thermocol, foam boards, fiberglass and all possible materials...

Please contribute and share your knowledg experts... Bow
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« Reply #1 on: October 25, 2013, 06:38:04 PM »
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have you finished the Airbus A320 ?
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« Reply #2 on: October 25, 2013, 07:24:04 PM »
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Out of coro... term exams going on too... finished Studying but no coro to work with...probably will go out after this month end to fetch some coro...
Do u want to buy it? Tongue

Please don't deviate the topic
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« Reply #3 on: October 25, 2013, 07:47:09 PM »
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« Reply #4 on: October 25, 2013, 07:50:35 PM »
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All lying w/o electronics in my cupboards
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« Reply #5 on: October 25, 2013, 10:33:21 PM »
amitbhisikar.2006
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Hey Great Idea sirji.

We do require some serious knowledge article on Boats design, construction and Hardware.

Will be a great post to see all experts like SB sir, VC, Sunk, Roopkrishna, sharing their knoweledge here (Sorry I missed many in that list  Grin)

 Thumbs Up Thumbs Up
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« Reply #6 on: October 28, 2013, 05:17:39 PM »
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Buddy,

this is very nice idea. We should keep it segment wise. i.e Period ships,Modern speed boats,Yacht or any other.
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« Reply #7 on: October 29, 2013, 06:32:54 PM »
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Hello,
Here are some common types of hulls use in model boats.
1)   Vee Hull (Mono Hull): - As name suggest shape of hull is like V shaped. There are different types of V hull commonly used Shallow V and Deep V. Works good in rough water handles good at turning but are tricky to balance. Most deep V is powered by single engine/motor but some shallow V boats are twin powered. Problem with twin in deep V is during turns one of the propellers gets more load than other. Power distribution a change drastically and there is fear of flipping over during tight turns. Mono hull or Deep V is good for some high speed tight turn action.

2)   Tunnel Hull (catamaran and trimaran): - These are boats with two or more hull connected with each other laterally. The gap between two hulls creates air pressure while in fast motion which in turns lift the hull to reduce the drag from water. These are very fast hulls usually powered by two engines/motor running contra rotating propellers. We can use single or double engine setup on this hull. Wide hulls allow us to place more equipment than any other type hull. Usually tunnel hull are dragsters they can attend higher speed as there is less drag from water. 


3)   Outriggers: - These are speed demons requires expert level of handling. Specially made for oval races.  They usually go in clockwise oval course. In outrigger two sponsons attached to man hull which is flat bottom. On left sponson there is stabilizer fin which keeps it from flipping over during turn. Outriggers are very sensitive than other hull types if you pull throttle very hard from rest position it will flip on spot or if boat is in speed and you cut the throttle instantly it will dig in water that may spoil your electronics.

4)   Flat bottom (usually Airboat): - These hulls as name suggest have flat bottom. These kinds of hull are used with airplane propeller with airplane engine/motor. These are pushed by air forcing backwards which is directed by big rudders attached after propeller usually pusher setup. No moving part from boat touches water except hull. These hull lacks maneuverability as they need to be in Continuous power to move and change direction.

Any update/correction/comment are welcome

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« Reply #8 on: October 30, 2013, 03:19:34 PM »
topalle
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Thanks for contributing...
Now please contribute info on the segments like Gajjark said...
Info can be categorized on the basis of skill required to build and ease of use of materials
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« Reply #9 on: October 30, 2013, 06:35:25 PM »
amitbhisikar.2006
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I am not sure about others, but I prefer Balsa. There is nothing like a balsa Except for cost but now a days Carbon fiber is most expensive material to construct models and the latest and strongest one.

Advantages of Balsa:-
1) Most important thing in any plan is getting the right pieces. Cuts smooth just with paper cutter or thermocol cutter readily available in almost every stationary shop. Bit difficult in cross grains but comparatively easy with other materials.
2) Availability, now not that easily available in any store but you can get it at almost all hobby stores. As compared to other material it is uniform all over you get it form Chennai or Mumbai or Delhi you get same balsa all around except little cheap brown balsa donít know the exact name.
3) What can be worse than a hobby which makes you sick? Balsa is the safest for very simple reason... because itís natural. Yes, saw dust can cause issue but not is much extend and but using mask while sanding is advised.
Disadvantages:-
1)   Not that strong Ė If we intend to use balsa we cannot use models made of only balsa. Your model will lack strength plus it will be heavy on your pockets as well. Parts like bulkhead and Keel of a model needs to be strong. They are foundation of any model. Slight bend on keel and boat will not go straight (Thought of using it against prop walk  Head Scratching Giggle) . A coat of fiber glass will give rock solid strength.
2)   Life of balsa especially for boat is less. Wet balsa can become very soft and can spoil your paint job. In boats mostly in shallow bottom hulls water will leak from the shaft casing if not secured properly. Best way to avoid this is by painting the inner part of hull to avoid any contact with water.

These are all my view. Any update/correction/comments are always welcome
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« Reply #10 on: October 30, 2013, 06:43:55 PM »
amitbhisikar.2006
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Hey topalle, I am just putting my views and understanding. There are others with far better knowledge on construction of hull. It would be great to have them here and share their views.

Amit
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« Reply #11 on: October 30, 2013, 06:45:49 PM »
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Sunboard, anytime.

Easy to cut, shape, bend, glue. Can be strengthened and made waterproof with Resin.

Disadvantage? Heavy compared to Balsa
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« Reply #12 on: October 30, 2013, 06:57:31 PM »
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+ 1 Rai Saheb! Hands down winner over Balsa as far as boats are concerned.
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« Reply #13 on: October 30, 2013, 07:40:12 PM »
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Should be. Had never heard of the stuff till you sent me some for my first boat build Cheesy Wink
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« Reply #14 on: October 30, 2013, 09:06:15 PM »
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Sunboard = coro?

Then I don't need to look of another material when I have loads of it in my backyard
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« Reply #15 on: October 30, 2013, 09:24:35 PM »
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Sunboard ≠ Coro  Grin

Sunboard = Foam board. (probably PVC foam)                                                                                                                                                    
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« Reply #16 on: October 30, 2013, 09:30:19 PM »
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Where can we expect to find it?
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« Reply #17 on: October 30, 2013, 09:30:38 PM »
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Sunboard = conpressed PVC foam

Corro = Sunpack

Depron = Foamboard

Depron without paper backing = biofoam Grin

Sent from my GT-S7562 using Tapatalk 2
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« Reply #18 on: October 30, 2013, 09:45:49 PM »
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Was confused between sunboard and sun pack...
Which shops sell it?
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« Reply #19 on: October 30, 2013, 09:59:09 PM »
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With respect, for scale model I think balsa will be preferred,   finish of balsa and the curves/shape we can model them is unmatched.

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« Reply #20 on: October 30, 2013, 10:44:00 PM »
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Amit, with my limited knowledge, I don't think Balsa would have made a significant difference to the curves of this boat. By the way, she is a scale model.

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Re: Basics of boat building (with any and every material possible)
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« Reply #21 on: October 30, 2013, 10:47:49 PM »
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A reputed company like Dumas is shifting to compressed PVC foam from Balsa for its Boat kits:

http://www.rcottawa.com/forum/index.php?topic=8439.0

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« Reply #22 on: October 30, 2013, 10:50:14 PM »
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It is not only the material that counts, it is also the technique involved. Here is the classic way of plank on strip building. Perfect curves after sanding!

http://www.building-model-boats.com/planking-rc-boat-hull.html

http://www.pt-boat.com/Hull2/Hull2.html
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« Reply #23 on: October 30, 2013, 11:01:21 PM »
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However, to be perfectly HONEST - if Balsa and Foam Board were available at the same price, I wonder what I would use for my builds? Huh?
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« Reply #24 on: October 30, 2013, 11:17:04 PM »
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VC sir,if you have limited knowledge then I have not even started studying. I know about boats but you are an expert. First of all I have never used sunboard, so no experience with sunboard and I was having wrong picture(like cardboard made of pvc) of sunboard. And the model it is awesome, I could even see some inward curves. Those are difficult even with balsa. Is sunboard available in hobby stores or we can get it from local market? Can I use it to make big model, does it have strength to take nitro or gas engine? Does it require fiber glass coat or we can get the finish directly with primer and paint? Cost, which is economical balsa or sunboard?

Too much question but answers will be really helpful.


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