RC India

Maiden videos of RC Wind surfing and RC Surfer...
http://www.youtube.com/watch?v=YN8_lTv6ISA&feature=plcp

http://www.youtube.com/watch?v=6JeS3rdzs78&feature=plcp

while testing this surfer it was almost night... sorry for the video quality.

Welcome Back Maharana!
Good to see you back in action! Nice build!

What is the material that is used to make the board.
Shreekant

sir that surfing boat is one peice of beauty.
really cool.
and the dummy blue surfer looks really nice.
congrats on this.

thanks Sreekant & Sahil.
The board is made of fiberglass (two piece molding) and came up nicely, no water leakage etc... the surfer is keeping / tilting to right on higher speed, need some counter weight to left and in the wind surfer the size of centre board has to be increased. will update the results soon.

the next couple of builds ( RC Kayak and RC Rowboat) are in progress......

Wow.. nice machine Maharana sir.. was waiting for the action videos..  :salute:

it appears that you are using the same dummy. :giggle:
really nice.

The mechanism of rowboat or kayak is very simple when the boat is steered with rudder, but without rudder both the mechanism gets complicated.

I have seen some youtube videos where the rowboat is controlled by 4 servos and programming, but I trying something simpler mechanism where oars can be synchronized automatically after disengaging any one of the oars ( I mean oars should hit the water at the same time after each successive turn)
http://www.youtube.com/watch?v=bpvC5AVfEVY

And in the case of sailing the kayak the figurine should oscillate while kayaking and bends more while taking tune to the opposite side.

Very nice, sir. This video shows 2 servos? One for each oar?

Sanjay bhai, there are 4, 2 for reciprocating and 2 for lifting oars.

and this very interesting & great video... rc canoes in action
http://www.rcmovie.de/view_video.php?viewkey=1cca999f55a43db2ce04

OK. At first I saw only the reciprocating!

The canoe is very, very good!  :D

I am making couple of rowing mechanism. One with locking type mechanism and the second one where oars can be lifted out of water. This page was quite helpful building the 2nd one.
http://www.modelboatmayhem.co.uk/forum/index.php/topic,2604.0.html

Here is the video:
http://www.youtube.com/watch?v=BXe-I-c0L7A&feature=c4-overview&list=UUBufh08NklV3HmY48BOve1g

Very nice. Now put it on a boat :D

that windsurf is amazing!  :)

what will be even awesom-er is if you can build a sailboat or windsurf, where a weighted keel is not required. maybe a weighted figurine made, hooked up to a gyro, so the more the boat heels, the more the figure will lean outwards... tacking it will just get one step more challenging ;D

Brilliant Maharana..This is a marvelous piece of Engineering.
Superb!!!!!!!

Shreekant

Thanks Sanjay bhai, Sreekant,

Fixing the mechanism inside the boat is also a big challenge  :banghead:
weight, size of the boat, waterline etc; all counts.


@Aniket
Even if you control the movement of the figurine by Gyro-Servo, the keel/centre board can't be eliminated.(Which transfers the wind force to forward motion) and in the case of Wind Surfer a moving Figurine will obstruct the movement of main sail.  

This is nice animation of Sailboat:
http://www.youtube.com/watch?v=rFA-Kiewdt0

@sb maharana sir, the keel(or centerboard for windsurfs) is mainly there to direct the energy accumulated from the wind so the boat moves forward and doesn't drift. in a real windsurf, the boat heels, and the sailor hikes to counter the heeling. the weighted keel system is usually used for large yachts where a human cannot hike.
the downside of a weighted keel system is the inherent drag caused by the weight, and the extra weight itself. if instead one could setup a 180 deg servo, which swings a weight around, it can simulate the hiking system of a real boat, which would not only reduce the weight required, but also allow the boat to sail faster, and utilize the minute winds it collects in its sails better...
i dont know how feasible it is, but i think if possible, it will be a pretty solid system.. :)

in the case of a windsurf, instead of a figurine, you put a swinging weight system at an angle.  so the weight, at the end of the swing, will heel the board just enough to allow it to plane.. :)

regards
aniket

I think you are looking something like this:
http://robroy.dyndns.info/RCmodels/A600/overview.php

video of the same
http://www.youtube.com/watch?v=xG21qJgGFUc

aaah! yeah!! thats exactly what i was talking about! ;D :P that yacht is quite like a laser.... :)

So far so good, made a boat with sunboard, the size is 14x4.5 inch & weight is approx. 650 gms., (it should be around 450 gms.). Tested the boat, oars are quite ineffective. Planning to replace the geared motor with a lighter one and slightly modify the shape of the hull for a better positioning of the oars.

supposing you increased the size of the paddle?

Sent from a potato using a lamp

All the best! What is the finished product going to look like? What design do you have in mind? This mechanism is an ingenious piece of work and I am sure you will hone it to perfection. :thumbsup:

Maharana !! Good Show !

i expected Turuk Makto riding the Last Shadow ;D

Thank you Sirs..... :hatsoff:

Due to overweight the boat is keeping too deep into water, and limiting the external length of the oars. The external length of oars should be 3 times bigger than the internal, which means the paddles should moves 3 times bigger than the internal mechanism. I have two options left (1) increase the height of the boat (2) reduce the weight so that waterline match the actual.

Could you change the angle of the oars? Make it a shallower angle?

That is what I want to achieve. Instead of reducing the size of the crank, will keep the U camp at a higher level and get the  bigger oar length.

Re-positioned the U camp at a higher point and extended the oars for a long arc. Oars are quite effective now and able to steer it nicely. Could not sail the boat with the figure, need little effort to fix it.
http://www.youtube.com/watch?v=p9c8GBOl7xo&feature=c4-overview&list=UUBufh08NklV3HmY48BOve1g

Very good! Is the steering OK? Seems to not be too responsive

Sanjay bhai, you are right, I did not notice it while testing. In just 4-5 cycles it is turning 360.
I will try to adjust it.  

check this link:
http://www.youtube.com/watch?feature=player_embedded&v=5iqyOh6UNtU#at=123

that is one of the best rc rowing boat, thanks for the link.
This is the internal mechanism of a similar build.
http://www.youtube.com/watch?v=gT3vEnWiJPY

Very nice. Also very complex! How to simplify; reduce dependence on servos, reduce number of moving parts?

Sanjay Bhai,
Actually the attempt is made to keep the hull clean and fix all the mechanism inside the figure as much as possible.

But the Germans keep things in a very simple and to the point manner. The rowing boat mechanism which I followed is Graupner Tina boat; I have tried my best to alter the some of the parts with various other methods, but could not. The only difference in my build is while turning, the arm is pushed away from the figure, where as in the original build it pulls inward.

If you remember the other build “red indian canoe” made by another German, took almost a week to understand the mechanism, previously I was thinking the paddling is just a circular motion mechanism but it is not like that. For example the rower sitting a right side of the canoe – left hand is for lifting and right hand for pulling the paddle and there is a delay in pulling action.  That means the pulling action starts when the paddle is about to touch the water. And surprising both the connecting rods are on the same crank, at different angle, and placed so well that don’t come in contact while rotating.

http://www.youtube.com/watch?v=-qJ1ZptJLKM

Very true sir. But I feel using a servo on continuous duty could lead to a failure. There must be an alternative

Slightly modified the plan of the row boat, for more stability and traditional rowing boat look. Order a lighter geared motor from HK (100 gms, the previous one is 180 gms).
http://hobbyking.com/hobbyking/store/__26267__133RPM_Brushed_Motor_w_75_1_Gearbox.html
Fiberglassed the plug. Some update pictures.  

used simul wood and finished the plug with PoP, Fiberglassed it after two coats of PVA (release agent).

Classic build ongoing sir  {:)} {:)}

PVA = Fevicol?

Thanks Sanjay Bhai. Planning for a wooden texture effect; learned the trick of wooden texture painting from a Steel Almirah Painter.

PVA is not Febicol, it is mainly used as releasing agent while making moulder from PoP, Cement Putty etc., but chemical properties of PVA is much like Febicol. 

finally completed this boat; some more photographs & video
http://www.flickr.com/photos/101712269@N04/sets/72157635561512266/

http://www.youtube.com/watch?v=Ws36kcm9DHs

Only one Word Maharana
B R I L L I A N T !!!!!!!!! {:)} {:)} {:)} :hatsoff:

Thanks Sreekant.

some of the intermediate build photographs:

...

A very complex and beautiful system of work there.. @ Sb_Maharana sir.. Amazing work. Could you please post some more details / images of the rowing mechanism if possible.
Regards
Punty

I have already posted the the working of rowing mechanism here:
http://www.rcindia.org/boats/avatar-ii/msg144904/#msg144904

due to lack of space I have changed the servo position, place it on the front side.

will try to post some more images......

Thanks for the link :)

Painstaking work but what a FANTASTIC result! Awesome finishing and detailing - each and every nail on the boat has been replicated.

Thanks Mr.VC
I have ordered a brushed ESC (with reverse function) once I have it will upload a better video.

Beautiful job sir. Extremely professional.

Thanks Sanjay Bhai.

Brilliant build, Maharana sir! {:)} {:)} {:)}
And I thought fast V hulls and hydroplanes packed all the fun. :D

Is the Avataar character hand made too?

Not just a model, a piece of art and an inspiration for us. :hatsoff:

@ Anjan - The Avatar action figure is used one; purchased from ebay.
@ Iyer Sir, thanks a lot.

completed this prototype kayak mechanism, more a self tutorial one.
http://www.youtube.com/watch?v=zd53g181dSE

brilliant piece of engineering!!!!! What an Idea!!

Thanks Sreekant, but the credit goes to this Gentleman who designed this mechanism, his final video yet to come :
http://www.youtube.com/watch?v=JsEpHjxaBT0

This is another rc kayak boat.
http://www.youtube.com/watch?v=FuQ5eIKWkH0

What is the function of the servo and how is it connected?

Here the Crank performs two functions (1) reciprocating action at the main axle (2) swing action of the main axle.

The swing rod passes though a ball joint, fixed on a perforated strip which in turn controlled by a servo. By changing the position of the ball joint and the lower end of the axle it is possible to steer the boat as shown in the below figure.