efferman

The Harbour Tug My entry of the "to sail the technic sea" contest is a floating vessel in the style of a Harbour tugboat. The feature of my tugboat is a Voith Schneider propulsion system. A classic propulsion system for ships works with a horizontal driveshaft and a propeller. The advantage of the vertical Voith Schneider propeller is, that it could adjust the boost of the propeller in all directions, without using a rudder. The vessel can move sidewards and rotates in every radius which the captain wants. To get a little view on the maneuver abilitiys i made a short Video of my harbour tug Technical Datas Two propellers in Voith Schneider style powered by twoPF-M motors with a gear ratio of 1:1.4 Two Pf-M to adjust the pitch of the propellers. The pitch controls the direction of boost. Two receivers and transmitters One 8878 LiPo accu Dimensions width: 280mm length: 600mm height: 360mm weight: 2790grams The Deckhouse and the Bridge is built modular to get a easy access to the electric parts the two dishes are used to show the driver in which position the pitch of the propellers is. on the afterdeck i have added a nonworking winch for the tow line The stabilizer sword and two of the airtanks which are adjusting the waterline of the vessel. more pictures on flickr and Brickshelf If you want to take a look on the building process, please click here Thanks for reading

looks good

unfortunately i can only give a direction and not a zero pitch timr, yes this should be possible but then there is no contrast between bridge and smoke stacks

thanks for your suggestions, have you to do with marine vessels? iam powering both voith scheider units with a single PF-M Motor. so i could not drive them separately and the pitch is only to control the direction of boost. the pitch of the two units i can change separately, so i can maybe prevent the yawing movement with an other boost direction of the propellers.

this will surely work good, but i like the design of the sword and i dont want left it. maybe one panel less in the length is a good compromise

only the 4 cornerparts and no straight panels? i think it is to 99.5 percent finished 101_9247 von efferman auf Flickr i hope you like the smoke pipes

looks much better now and i like the idea with the fishing rod.

simply use flickr, brickshelf, or an other picture hoster. attachments are not a good way to post pictures

i will modify my first post too, to get a proper overview over the finalized model.

well, even lego is built with plastics it has a weight. as an example the 5x11 panels. one of them has 9grams 9x43= 387 grams. then all the liftarms, pins, axles, connectors, plates and electric parts. iam surprised that it is not more heavy edit: conclusion: moving straight sidewards is not possible with the stabilizer sword, but normal steering is much more easy

i dont think that train weights would be a good idea. because the blade and the finished afterdeck it is now at the back to heavy. so i need more flotation force at the back. by the way, the current weight is 2660 grams. a vid of the newest testrun will follow later this day

thanks by the way, the back of the tug is finished too 101_9246 von efferman auf Flickr

ok, i have added a very big and massive blade, longer propellers and a secure plate to prevent collissions with the propellers 101_9245 von efferman auf Flickr i hope it works

sure, my moc is not finished yet and it is listed in the tsats index

can you fit them inside the hull. placed like a triangle? so you should prevent the turn of current

the mechanism for the pitch is between, and most of the blades is under the bottom line of the hulls. i think i will experiment with longer and other types of blades to get a better performance 101_9244 von efferman auf Flickr

hm, its worth to make a try

it is not the problem to drive straight forward, but rather to coordinate the two propellers. a schottel drive has a good to see push direction picture source a voight schneider is abit more cryptic to see, where the water will be pushed picture source so it is a long learning and adjustment process, till i get a smooth driving experience

i was not sure if the propellers working with all the weight, so i made a little testrun before i finish it. in this situation i made a little vid. the steering is slow and very complex to understand, but i think with the fact that is only one M motor is used for propulsion, i can be satisfied. i hope you like it

thanks for your suggestions, i will se what i can do. edit: i have only 44 grey panels. ist this a large amount? edit² i think you was right 101_9242 von efferman auf Flickr 101_9243 von efferman auf Flickr

thanks guys, the optical things are sometimes very hard for me, so your praise is good to hear. the newest progress is a big part of the afterdeck and the winch (not working) 101_9241 von efferman auf Flickr

Thanks guys i have moved the house/bridge 5 studs backwards, to get a better balanced place for the center of gravity. and i have began with the rear deck and making the hull longer with panels 101_9239 von efferman auf Flickr 101_9240 von efferman auf Flickr

it was a very good decission to use two boat hulls. with the current building process the center of gravity is too near at the front of the harbour tug. i will have to mount two or more airtanks, under the front between the hulls, to get more water displacement. the rear will be longer and so the center of gravitiy will go back 101_9238 von efferman auf Flickr

well, you have hit the bullseye. will it be in the 8110 scale?