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    LewZ
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    Member No.#6724
    RegisteredπŸ“…23rd Jan 2022
    Last OnlineπŸ“…26th Feb 2024
    CityπŸ“Clearwater, Florida
    CountryπŸ‡ΊπŸ‡ΈUnited States
    Gender♂️Male
    AgeπŸ‘Ά79
    PostsπŸ’¬538
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    Lew Zee (LewsModelBoats.org)
    About
    Retired senior designer of test/production equipment and CAD Operations Specialist. Hobbies: RC scale model boats; RC scale armor; 3D modeling & 3D printing; web site design and maintenance.
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    Recent Posts
    πŸ“ Heatsink Fins
    10 hours ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 16 Views · 1 Like
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    Actually I think most of the ESCs for scale model boats are air cooled. I rarely have seen any water cooled ones, and those are usually on high speed boats.

    I was given a USCG 47 ft MLB that had a water cooled ESC in it, and that was promptly taken out and now has a pair of Hobbywing 1060's in it. Both motors still have the operational re-routed water cooling coils on them. The water comes in via the bottom of the hollow rudder shaft.

    Better/modern ESCs run more efficiently tossed together with keeping the motor current on the safe side of the ESC.

    Attached is a picture of what I typically build for my water feed-throughs in the hull that I explained in a previous post. I turn them out of brass bar stock but they can be made out of some tube and sheet material soldered together. The flange sits on the inside of the hull. Size depends on the cooling coil and feed tubes diameters

    Lew
    Florida, USA

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    πŸ“ Heatsink Fins
    17 hours ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 44 Views · 2 Likes
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    Heatsinks should work OK as long as cooling air is going over them. Obviously, most boats have the motor(s) confined in the hull with an enclosed deck and superstructure. So there needs to be some testing/checking done.

    I generally don't use air cooling. If I have issues with overheating I use aluminum cooling coils made for these motors. Two holes in the hull with 45 degree cuts, one facing forward (input) and one facing aft (output) works for me.

    The faster the boat moves the increasd water flow cools the increasing heat of the motor.

    Lew
    Florida, USA

    πŸ“ ACE Nautical Commander 7-ch Gold radio
    19 hours ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 32 Views · 3 Likes
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    Isaac, I also have one of these Ace sets. (We have the Suncoast Scale Model Boat Club here in Pinellas County, about 78 miles north of you.

    I noticed the voltmeter is displaced in the panel on the transmitter. Did you check the connections? Another check (receiver) that might work is to connect the receiver to a battery and a servo to see if the servo "chatters" or humms which is somewhat common with these older radios.

    Lew
    Clearwater, Florida, USA

    πŸ“ Styrene glues???? on Styrene boats
    2 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 43 Views · 5 Likes
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    For me I feel the strongest joint between two materials is a "weld" joint. That is where the materials actually dissolve into each other. For that I use standard styrene cements such as Plastruct, Testors, etc. Even acetone (100%, nail polish remover) works as it melts the surface of the styrene. As I occasionally cement ABS (3D printed) parts with styrene sheet and shapes, these work well. Don't use these if you are trying to cement other materials such as copper to styrene.

    Lew
    Florida 😴, USA

    πŸ“ Crew, People, and Detailed Interiors
    2 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 50 Views · 4 Likes
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    They look anxious to hit the water. Looks like the girl is aboard and ready to go.

    Lew

    πŸ“ Crew, People, and Detailed Interiors
    3 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 58 Views · 5 Likes
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    Len and all...

    I'm happy to see this subject take off. Going beyond just building the boat, figures and other items complete the "art" that many model builders create. Like you said, you added figures to your 1/14 scale trucks. I do likewise for my 1/16 scale armor. (The armored car was an M16 with a quad 50 turret mount and and significantly modified to be an M3 troop carrier.)

    It does take a lot of research and work. A lot of 3D figures on Shapeways (ugh) are of poor quality and very overpriced. for my PT61 gunboat I have about a dozen figures. At 1/20 scale, USN figures are hard to find. Fortunately, I found some Tamiya pit crew figures that could be modified (grinding and filling, cutting to reposition limbs, etc.). Also, the PT crews in the south pacific tended to be more "un-dressed" (photo) so by adding the figures to reflect this even enhances the model. The same 1/20 scale Tamiya pit crew figures are now sailing it the trawler off of Hull (UK) but in miniature in a pond in Florida.

    The 1/40 scale figures on my Wiesel are actually 1/35 scale WWII Russian naval infantry. Simply by cutting the figures in half at the waist reduces the height perfectly.

    Many model boats not lacking figures but a lot of other nautical needs scattered about the decks as well. But that could be a conversation for another subject!

    Lew
    Florida β˜€οΈπŸ˜Ž, USA

    More info on figures:

    https://lewsmodelboats.org/M-scale-figures.htm
    πŸ“ Crew, People, and Detailed Interiors
    3 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 69 Views · 17 Likes
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    One of the responses on this forum was "I generally don't detail interiors". That's OK, but it kind of ignited my thoughts on this and I thought it would make a good topic for this forum.

    While I avoid adding interiors and people to my builds if they are not visible, I feel that in certain instances, crew and/or people and/or interiors are appropriate they they are clearly visible. Not so much as for when the boat is in the water but when sitting on the tables when not in the water. We almost always use a covered shelter with tables at our meets. The models are in plain view of other members as well as casual visitors to the park.

    There are instances where the boats are in the water and some figures would look great onboard. A number of times I have seen open run-abouts operating without "anyone" on board. At least a Ken or Barbie doll would look better that bare seats.

    Figures on board give a sense of some realism, even just "sitting there" when used properly. These figures also present a good reference to the relative size of the vessel so I will frequently have some figures on deck.

    All of my models range in scale from 1/10 to 1/40. I enjoy these larger scales because if I get close to the model physically I get a sense of actually being on board observing what the real boats were like. I've been aboard various boats and ship running from my own canoe up to touring a supercarrier but not much like the models I build.

    I have only one model boat with a non-wheelhouse partial interior, and that is my towboat, because the engine room double doors are open.

    Almost all of my boats have some level of detailed wheelhouse interiors because of the large scales with noticeably large windows. I have only one boat that has opaque windows and that is my 48 ft USCG motor lifeboat. However, to overcome this I have figures on the flying bridge and deck which distracts from the "unviewable interior".

    As there is frequently a problem trying to find the correctly dressed figure in the right scale, the figure(s) often become a building task on to itself.

    Just my opinion.

    Lew
    Florida, USA

    πŸ’¬ Re: Wheelhouse
    4 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 28 Views · 3 Likes
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    Hi Steve...

    I am currently working on the wheelhouse for my latest Springer. I created the parts and 3D printed them in ABS (which weld cements to styrene). Attached are the latest photos.

    I plan on using the same method as the previous Springer. This involves a step around the window openings for the "glass" to fit into. Also plan to use a tinted plastic food container cut to the various sizes. The interior will be detailed.

    Lew
    Florida ⛱️, USA

    πŸ“ Mystery boat
    7 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 45 Views · 3 Likes
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    One option is the link below.
    Second option is a float activating a micro-switch.
    I am trying to retrieve info on a DIY bilge pump water sensor that someone sent me many years ago🀞.

    Lew
    Florida, USA



    https://www.bonzisports.com/product/electronic-bilge-pump-bonzi/
    πŸ“ 3 brushed motors on a boat-how to control
    8 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 30 Views · 2 Likes
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    Originally I used the Ace Nautical Commander on this boat but changed to 2.4ghz radio. Physically a great transmitter for multi motor model boats. Too bad it is old technology that it is not carried on.

    Lew
    Florida, USA

    πŸ“ 3 brushed motors on a boat-how to control
    8 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 30 Views · 3 Likes
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    I use the same setup on my Wiesel schnellboot. Two mid motors switched together on/off for foward only, outer motors on ESCs.

    To operate the transmitter is very simple. Hold the transmitter as per the photo.

    Both thumbs up/down independently or in tandem for outer motors ESCs controls. Right thumb left/right (horizontal) for steering.

    Two options for switching the inner motor(s) on/off:

    1. Set the switch channel to one of the upper left switches and use your left index finger to flip the switch while holding the left stick in place with the left thumb (if the left stick is spring loaded centering).

    2. Use the left stick horizontal channel to switch the inner motor(s).

    Lew
    Florida 😎 (but today a lot of rain), USA

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    πŸ“ Mystery boat
    8 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 48 Views · 4 Likes
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    There are several methods of turning on bilge pumps in model boats when water is present: floats and sensors.

    Lew
    Florida, USA

    πŸ“ 3 brushed motors on a boat-how to control
    8 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 39 Views · 4 Likes
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    I have great performance with the following setup for my PT61 (PT gunboat, 1/20 scale, 47 in. long):

    The two outer motors each have ESCs and the inner motor is controlled by a switch on its own chanel - forward only.
    No need to run 3 motors in reverse. Great for slow speed maneuvers with having independent outer motors control.

    To accelerate, gradually move the two (outer) throttles forward then flip the center motor switch on. This gives smooth acceleration.

    I have photos and a schematic on the PT61 in my harbor list and on my web site.

    Lew
    Florida, USA



    https://www.lewsmodelboats.org/PT-Index.htm
    πŸ“ New Boat
    9 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 40 Views · 4 Likes
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    I believe there are many variations of Kort nozzles. Upon updating my memory I found some unusual ones made of multiple pieces welded together. The most unusual was what looked like two semicircular parts, one on each side of the propeller with small rudders fixed on the output side. The whole contraption had limited side movement for steering.

    In contrast, a better performing setup is the z-drive with a propeller that runs in one direction only (for efficiency). To reverse, the dive is rotated 180 degrees.

    With the depth of the Mississippi River (U.S.) varying so much most of the towboats are limited to a draft of nine feet What most people don't realize is there are large propellers under the boat, so large that the upper edge almost reaches even with the surface of the water. However, that is contained (concealed) in a large concave area in the under side of the hull. You can see that in the attached drawing is part of a complete set of plans I made with the intent of building the "M/V Arne Christiansen". (Shown with Graupner z-drives.)

    Lew
    Florida, USA

    πŸ“ Proportions between ship size and propeller diameter
    9 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 34 Views · 0 Likes
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    I have to agree with Doug. There are to many variable in comparing the ship size to a propeller diameter. Not even close.

    Lew
    Florida, USA

    πŸ“ Small lifeboat
    9 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 25 Views · 1 Like
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    I have one that I created for the steam tug "Frederic Mistral" (Duna) tug and it is on Shapeways.
    Lew
    Florida, USA


    https://www.shapeways.com/product/7WAVTR2J5/frederic-mistral-dory-1-35-1-40-scal
    πŸ“ How to figure out motor size for a Coast Guard MLB 47
    10 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 17 Views · 0 Likes
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    Deleted (Posted on wrong topic).

    πŸ“ New Boat
    10 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 53 Views · 3 Likes
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    Ed W...

    Re: Voith Schneider. "As draught, they are no deeper than Kort Nozzles or Azimuth Drives."

    Not completely true being that many Korts and Z-drives are not mounted completely below the hull. In fact I believe that most Kort nozzles are in line with the propeller shafts. There are many real boats out there with the Z-drives no lower than the keel.

    First, lets step back a bit. Kort nozzles are the shroud or "ring" around the propeller to direct more thrust along the axis of the shaft and reduce or eliminate the radial thrust caused by the design of the bare propeller. The Kort nozzle can be used with the propeller on a fixed shaft as well as on a Z-drive.

    The "shroud" or frame around the VS drive is used to protect the vertical blades from the bottom. For applications in models it seems that the vertical blades would be more prone to weed clogging due to the open sides. Not all VS drives have this shroud.

    Having a model boat with a VS drive certainly would attract attention when out of the water. In the water, boats with Z-drives and those with Kort nozzles and flanking rudders come somewhat close as to visual performance, i.e. "dancing around in a circle".

    Lately, I have been making my own propellers and Korts. Note that Korts are not a simple ring like a cut off piece of pipe. They typically have a cross-section that looks more like an aircraft wing profile.

    Lew
    Florida, USA

    πŸ“ New Boat
    11 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 56 Views · 2 Likes
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    I've seen some videos of the Voith Schneider drives in rc boats. Pretty cool idea! However, I wonder about how they would run in water that has some vegetation in it. They also require deeper water.
    Any feedback from someone that has one?
    Lew
    Florida ⛱️, USA

    πŸ“ We were on Vacation, and passing through Tucson, AZ. Decided to see if Dumas had a showroom.
    12 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 76 Views · 8 Likes
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    Imagine having a job working there!
    Lew
    Florida ⛱️, USA

    πŸ“ Transporting the boat
    12 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 43 Views · 3 Likes
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    Looks very nice. Good workmanship. However the carriers look like they would take up some space.

    I made simple stands (see photo) for all of my boats. The base is about 1/2 to 1 inch longer and wider than the extremes of the boat. This way when the are on a flat surface (like in my SUV) the hulls do not contact each other. The boats remain on these stands while on display on my shelves, in the auto, and on the benches at the park. As for tool storage, I have a "salesman's case" that has rollers and an extending handle. I holds my tools, battery spares, signs, water pumps, and even space for a few transmitters. I use the same case for both model boat and model tank meets.

    The other type carrier I use is for my armor. Same basic idea, the base is larger than the perimeter of the vehicle so they can all sit next to each other without damage, but in this case the carrier also carries the transmitter and accessories for the vehicles. The vehicles stay on these carriers from display at home to the table at the tanks meets.

    I guess we all have our favorite designs. I needed to keep my ideas on saving space and weight.

    Thanks for sharing your photos!

    Lew
    Florida, USA

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    πŸ“ Servos going crazy
    12 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 44 Views · 2 Likes
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    Maybe I missed it but what kind (brand/model) of ESC do you have?
    Lew
    Florida, USA πŸ‡ΊπŸ‡Έ

    πŸ’¬ Re: Propulsion Begun
    19 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 53 Views · 3 Likes
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    Kevin, good progress!

    I cheated a little with my Emma C. Berry (also a Sterling kit, same size as the America) by using nylon sail cloth. Got it from a sailmakers' loft (interesting place) in Clearwater. Was going to RC it, but only got as far as in a pool in one of the malls. I made a bunch of sails for my 50/800's.

    I did make a small sail for my trawler out of cotton cloth. It's amazing on what different skills building model boats utilizes!

    Lew
    Florida, USA

    πŸ’¬ Re: Guestbook
    21 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 30 Views · 2 Likes
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    Here on the west central coast of Florida, this has been a crazy winter. Much cooler than an average winter, about two weeks ago we had a break with a few days setting record highs (into the low 80's F). Back to the cool, damp, and occasionally breezy weather.
    The tourists and recent transplants don't seem to mind. I moved here 60 years ago and my blood has "thinned out". Those tourists walk around in shorts, tee shirts, and flip-flops while we are bundled up.
    Today, another "front" moved through bringing a lot of rain, cancelling the meet as Kevin mentioned. Prior to this we had several days of good weather for model boating. Why is it the weather seems to be at its worst on Sundays?.
    Lew
    Florida ⚑, USA

    πŸ’¬ Re: Rain! No Boating Today! But Hull Painted, Yes!
    22 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 63 Views · 2 Likes
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    Kevin, these guys are pretty tight, follow the rules and probably not very flexible in mixing RC sailboat classes. They can't say no as it is a public park. Worst they can do is tell you they won't share the shelter.
    Lew
    Florida, USA

    πŸ“ Building a Scale Model "Springer" Push Boat (Part 5) Railings
    22 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 35 Views · 10 Likes · 3 Comments
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    Gradually getting back to this Springer. This part involves building and installing the railings.

    Railings on a Springer are a bit challenging. Many Springer owners know that these boats often collide when in competition with other Springers (water sports, racing). That's the fun part of having a Springer.

    Luckily, with this Springer being at a large scale (1/16), the railings are larger in diameter. With that this leaves room for a little extra support which is detailed in this video (see link). (There is a little overlay error in the beginning titles, so please ignore that. Can't edit a finished video in YouTube and use the same link.)

    Lew
    Florida 🀞, USA




    πŸ“ Propeller manufacturing.
    22 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 38 Views · 4 Likes
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    Getting back to model boats...
    Do you build your boats bare-foot in the mud? (I've seen some operate their boats here while barefoot. Haven't seen πŸ™ˆ any toe nibbling gators around lately.)

    Lew
    Florida 😎, USA

    πŸ“ Propeller manufacturing.
    22 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 41 Views · 1 Like
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    Maybe the poor lads with bare feet could not afford the safety sandals. Unbelievable how much the straps protect the top of the feet. The non-slip soles are also helpful.
    Lew
    Florida ⛱️, USA

    πŸ“ Propeller manufacturing.
    23 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 67 Views · 6 Likes
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    I wonder what the rate for foot injuries is in a country like that πŸ€•. Most with bare feet or sandals, one or two people with shoes and one with boots. Hammering the old blades with steel/iron shards flying everywhere. Hard, dirty, and unsafe jobs! Got to hand it to them though...

    With those "wobbly" propellers they must have some fantastic u-joints. No Dumas "dog-bones" here!

    Lew
    Florida, USA

    πŸ“ Motor and prop shaft issues
    24 days ago by πŸ‡ΊπŸ‡Έ LewZ ( Commander)
    ✧ 32 Views · 1 Like
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    Looks strong and smooth running. Great work.

    Lew
    Florida 😎🚀, USA



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