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Thread OP
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thank you
thank you ropanach & old 8140,
to tell you the truth, i didn't think it was so great... i find most people here make things so much better. or did you by any chance think those images from the professionals were mine? my turtle ship is only those images in the middle. anyhow, i appreciate your words. hmmm.. maybe i should go homedepot or any lumber nearby tomorrow to buy new set of 2x4s... |
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Thread OP
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some improvements
thank you, ropanach.
following Umi's advice, i have made some improvements. now the oars are shorter but thicker and there is sculling movement. thank you, Umi. also, spikes have been placed on the top; these were used to repel enemy's jumping on the ship. the two masts are now leaned backward; this is attack mode. during attack mode, the sails were not used. the movie files show sculling in action. the weather has not been great so i have not been able to test out in the pool. i'm wondering if it will create enough propelling force... |
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Last edited by Vfly; Oct 26, 2005 at 01:54 AM.
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The Ship looks great. Nice carving on the head also.
How about a picture of how the oars were finally connected. There is a place to post Videos here https://www.rcgroups.com/forums/forumdisplay.php?f=277 See if that forum will host it. ![]() The oars may need to be over sized by at least 25 percent. If you find that they aren't performing, and want to avoid rebuilding them, you could probably attach clear plexiglass/perspex to the bottom of the oars to give each one more surface area. |
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looking good. glad you got the oars figured out.
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Thread OP
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thanks
thanks wingnut163.
Umi, you're amazing! how did you figure out about 25%? have you tried asian boats before? anyways, here's the link. thanks for the tips. https://www.rcgroups.com/forums/showthread.php?t=433697 |
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Over sizing rudders and props by 25 percent is kind of a standard for scale models. Similarly, deepening keels on sailboats by up to 200 percent is another "kind of" standard, to counter for over scaled wind.
Is the boat actually moving in that one shot or is that just drifting forward. I like the "go go go..." in the background ![]() Watching the videos I would suggest a few things. .See if you can counterweight the motor connection. I would be curious to see if it would help smooth out the motion. .Increase the diameter of the driving connection. This would put a sharper angle on the oars, and increase the stroke distance. .Put more weight in the boat so the oars are deeper, or increase the length of the oars so that they are deeper. Along with increased surface area. Great to see it all working. Fantastic job of engineering and assembly.
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Thread OP
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Quote:
to tell you the truth, it was my 6-year old boy shouting and he pushed the boat... so the boat was not really moving by itself... i did not quite understand what you meant by 'counterweight'. i also thought i should have increased the diameter of the circle, but due to the way all those eight oars are connected and also due to the distance of holes in the arms, increasing the diameter is not an easy job. i may have to use some other motor... initially i was going to control each side differently, but it's not possible now, so i guess i'll just use one motor moving both sides. and just use the rudder for making turns. i really think that adding more weight should solve much of the problem. but i saw a couple of leaks in the boat, so i should repair them before i put some load (maybe right in the middle). i think i'll be able to make a lot better one after this thank you so much, Umi!! |
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A couple of coats of laquer inside and out, after the hull is dry, should take care of the leaks.
Take a look at the steam engine again. Notice that opposite the point where the drive rod is connected the wheel is solid, or weighted. The motor has to lift all the oar handles. I was thinking that if the connecting arm that lifted the oar connecting bar was counter balanced the motors might run smoother. As well as you have them working it doesn't seem really necessary, it was just one of those things that go through my head as I look at machines....
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