Boat is Scratch built 36" British Power Boat 64ft High Speed ASR Launch which belonged to the RNZAF. The launch was one of the 22 built and was shipped to NZ in 1940. It was the only one of its type in the Southern Hemisphere. Model has twin motors, ESCs, sound units etc. Has remotely switched water pump for water cooled brushless 2000kv in runner motors and remotely switched lighting. Uses 2x 2200mah 2s LiPos for drive and 1 1800mah LiPo for the pump (also a separate battery for the LED lights. Boat is built with strip planked balsa on ply frame and fiber glassed. Deck is ply, wheelhouse is varnished balsa. The colour is as it was for most of its time in the RNZAF . Took about 5 years on and off to build and finished it last year. (please ignore the time date - can't get rid of it .
Hi John, think somehow you've got the wrong end of the stick!🤔 All BECs are Battery Eliminator Circuits of one sort or another. The objective is to eliminate the separate receiver battery, sometimes necessary purely to save weight and/or space in small models. If you do that then the RX power must come from the main drive battery, which then has to supply all RX functions; servos, switched lights etc etc. Personally, if the boat / ship can carry it, I prefer to use drive batteries for just that and use separate battery for the RX and special functions. Some of which, like smokers for instance can be current gobblers. Cheers, Doug 😎 PS If you ever find a way of eliminating all batteries and still get the RX to work and the boat to move PATENT IT QUICK!! 😁 Cheers, Doug 😎 Hmmm! Maybe a raft towed behind with an array of hi-current solar panels!? 😁😁 Years ago in my work in NAVAL COMMS systems I once suggested to a shipbuilder, who was complaining about the number of antennas needed, to put some of them on a raft behind the ship 😉 Now they are doing just that with antenna buoys from submerged submarines! No credits 🤔 ... SIGH 😉
Hi Martin, 'Linear' in this context just means more or less a passive analogue device, and when it's on it's ON full stop. Decades ago I made my own with a simple one chip circuit using a 3 legged voltage regulator L7805 5V 1A and they're still going strong😊 The SBEC uses a fast switching type of power circuit, similar to the pulsed DC outputs of the ESCs. The switched type is an active device and is more efficient, less battery power wasted as heat, but can cause interference with older 27 / 40Meg RC receivers. Shouldn't affect 2.4Gig sets though. Cheers, Doug. PS even in a blackout I think I would find my way to the wine cooler or my malt whisky! 😁😋
Hi Martin, BEC is the Battery Eliminator Circuit built into an Electronic Speed Controller. UBEC is a Universal BEC which takes power from the main (drive) battery and supplies 5V or 6v to the receiver. It can be a linear device. SBEC does the same job as a UBEC but is a so called Switched device which is more efficient than a linear. So functionally for our purposes there is no difference. Alles klar Herr Kommissar!? 😉 Cheers, Doug 😎
Starting a bit backwards here as have posted more recently with some ideas. If you are going to have a twin brushless system using 1 REC, you probably should have twin 2200Mah 2s lipos, a power lead (I use a JST plug set) taken from the input leads of ONE ESC (not the batt leads) (I break into them and solder the JST leads on ) run those to a UBEC and then to your REC switch then to your receiver. If your ESCs have a built in BEC, withdraw the red power wires from the BEC receiver plugs and tape them back as you now don't need the power from these. If your TX is 2 stick 4/6ch etc and is capable of being changed to 2 throttle sticks (provision for ratchet strip - copy if necessary - on opposite gimbal - ie using set up as mode 1&2 throttle) you can use the existing throttle and elevator stick to give full independent control with either rudder or aileron Ch for rudder. The Chinese ESCs I use have a power switch as well as BECs which is handy. I would keep the brushed system separate from the brushless altogether with its own battery (or try power from the other batt as described above) otherwise you may be trying to mix 3 phase and single phase at some point. If you are using 2.4 you could use another paired 3ch receiver (does work, as mentioned in my later post) to only run the brushless throttle from a rotary sw on your TX (if you have that )
[Score: 8/10] 33"/3700g "Maureen Lee" Capable of 3mph and a runtime of 90mins Single Propellor (3 Blade 30mm) Direct Drive to a 550 type (3 Blade) Powered by NiMH (7.2v) 3Amp/h Batteries Controlled Through Unknown ESC - Comments: The “Maureen Lee” started out as a Bristol Bay ready-to-run semi-scale model of a typical European fishing cutter. Many modifications were made to her to make her look like an old, worn-out fishing boat. Factory-installed switchable work and navigation lighting means that she can even be operated at night. A 550-size electric motor and metal propeller allow for ample power. A Bristol Bay model is supplied practically fully assembled… you need only mount the two masts and install the batteries. Numerous robust details make this model look great at home or on the water! Technical specifications: Hull length: 850 mm Width: 220 mm Overall height: 737 mm Total weight: 3650 g
Hi Martin, ALL Dumbphones and PCs (or better said the browser used on the PC) have these irritating auto correct / auto type functions. BUT they can always be switched OFF. Just look in the [Settings] of your web browser. Cheers, Doug 😎
My pleasure TJ, get well soon👍 But as an ex Pat living in Germany for 30 odd years and having worked on several types of Fast Patrol Boats / Fast Attack Craft your spelling of Schnellboot is still making my hair stand on end! 🤔 BTW: DON'T cut the switch wires on the ESCs or you won't be able to turn them on! Cut the red wires in the 3 wire cables from the ESCs to the RX. Cheers, Doug 😎 BTW 2: boat looks good, nice work👍 I have a couple of 1/72 kits for E-Boat / S-Boot, hope mine turns out as well as yours! 😉
Mornin' John, agree re chromite, but still don't know what chroDite is! I only personally own the one Taycol Target. I got into this whole Taycol business while I was renovating Dad's old Sea Scout last year and decided I wanted a bit more Oomph so upgraded it to a 1000kV brushless, which gives goods results on a 3S LiPo. See the vids I've posted of the the 'Sea trials' (Lake Trials!?). So I decided to use the Target in the ancient Billing Boats Danish fish cutter I'm restoring and converting from static to RC. Figured the Target would cope OK with the plodding pace of a fish cutter😉 BUT, I wanted it to be reversible without cumbersome external switches or relays as recommended by Taycol / Keil Kraft in those days. After surfing around a bit a found a website where others had tackled the same problem. Looked at their solutions and refined them slightly. All I do is rectify the pulsed (square wave) signal from the ESC with a bridge rectifier (4 hi-current diodes in a bridge form in one package), apply the + and - outputs from the rectifier to the field coil so that it produces a constant magnetic field just like the permanent magnet of a canned motor. The two alternating (pulsed) outputs of the ESC are applied to the AC (~) inputs of the rectifier, which go + / - or - / + according to the command from the TX, I apply to the brush terminals just like a normal brushed motor setup. The output of the ESC is a train of either positive of negative going DC pulses. Pic 2 the positive train on the scope. Pic 3 the negative train. The larger and wider the pulse the higher and longer the voltage is applied and the faster the motor spins. So called Pulse Width Modulation (PWM). The gaps between the pulses are smoothed out by the inertia (flywheel effect) of the motor, and anything hanging on it - like a prop and a few million gallons of wet stuff 😁 Hey presto, a field coil motor that runs forwards or backwards on command 😊 Main thing is simply to separate the field coil from the armature coil (i.e. brush gear) so you can control each one independently. No rocket science but highly satisfying when it all comes together and works on the pond. OK, I'll look up Mr Lynch, wasn't he the Sarge in Z Cars 😁😁😁 Cheers, Doug 😎
Hi All here is the last on the schenllboot S100 I have been able to finish the paint work on the hull and she is now ready for final coats of varnish and full reinstallation of the RC equipment , still a bit nervous about that, part of the installation instructions are indicating the red wires on two of the esc,s need to be cut , I think this is the switch wire so the you only need one switch to active the other motors . I will look in to that before cutting
W1 by jbkiwi Chief Petty Officer Posted: 6 days ago
This is my scratch built 36" RNZAF British Power Boat 64' HSL (arrived in NZ 1940). I actually went on board this vessel in 1968 when it was still in original form (the RNZAF having disposed of it in the 50s) This vessel is still around and has been recently re modelled (2nd time since early 70s) and I was lucky last year to have met the present owner and go on board (2nd time in 49yrs!)and take a few photos. The vessel was modified a number of times by the RNZAF over the years (air intakes, removal of the fore deck machine guns, wheelhouse turret etc so I sort of went in the middle. I found a few drawings of the type in an old mag which had side and top views plus the bulkheads and their positions, so I took them along to a copying shop and kept enlarging them until I had the desired proportions. This worked out quite well and using a few methods from other models I had built, managed to frame (ply) the hull and then fully strip plank it in balsa. It was then fiber glassed. The deck is ply, lined and varnish stained. The wheelhouse is varnished balsa with the top removable for access. The wheelhouse interior has detail such as controls, instrument panels, skipper, steps to wardroom etc but is not too detailed as it is not seen. The boat has full lighting by remote switch, lights are all LED. The propulsion side has dual everything (motors, ESCs, sound units), would have had 3x but ran out of space! Motors are 28mm 2200Kv water jacketed in-runners (cooled by remotely switched pump) using 30A Chinese ESCs (have 5A BEC, Fwd and Rev). Twin sound units are 'GT Power' car units which have around 40 different sound selections, from Cosworths to diesels and are computer programmable (as well as manually on the unit ) for various functions. I am using one of the v8 sounds (8 cyls short in my application) which I think is as near as you are going to get to 3 Napier Sea Lions (for which there is obviously no sound available) They 'start' 'Idle' and are fully proportional in fwd and rev and can sound quite realistic (will attempt to put up a vid later). Batteries are 2x 2200mah 2s 20c LiPos which will last around 2hrs at least of sailing (they also run the sound units) Still have a few small things left to do (have just made wheelhouse air intakes) but don't want to get too fiddly. Just want to keep it a practical model.
Hello, Doug: Out of curiosity, did you remove the molded-on plastic ladder rungs from inside of the mast to gain more space for wires? Seeing your finished mast has shown me that it’s best to keep the original nav light locations. Having all 6 lights on the main mast will make it look too cluttered. With all of the lights switched on it’ll look like a light saber is jutting out of the pilot house roof. Do you know if there are standards governing the horizontal spacing of navigation lights? There should be, otherwise I’d think the lights could tend to overlap & look like one big light, especially in fog. BTW, the cables you added to the mast antennas look great. The smooth curve of the cables & the weather boots at the antenna connections add a lot of realism. Well done!👍🏻 Speaking of details, do you know if tugboats carry anchors? If so, what type? As far as I know the US Coast Guard requires every powered vessel to have at least one anchor. I see no reason why tugboats would be exempt from this rule. I’m glad you mentioned using a Tamiya sanding sponge as a means of removing the factory-applied lettering. There’s a model railroad technique I’ve used successfully where an ordinary pencil eraser & window cleaner are used to remove lettering. I’m sure it would work on my boat but I might not live long enough to get it finished. Shortly after I got the boat I ordered a cloth American flag & scale Plimsoll markings from BECC. Sadly BECC has gone out of business. Another good supplier goes around the bowl & down the hole. Sad. Regarding the winch again, your comments tell me that I may have misled you into thinking that my boat has a winch. It doesn’t, but I did say I’m planning to scratchbuild one. In fact, I’m going to sketch one out right after I post this message. Thanks, Pete
Mornin' Pete (it is in Germany anyway!) I agree, there are lots of details and 'standard equipment' missing from the basic model. You can see the winch and Life Raft canister in one of the photos of the original I posted above. Re Mast wiring; don't fiddle about putting a divider in the mast. It'll just get in the way. Attached is a pic of my modified mast. I used a 0.5mm brass wire on the right-hand side for the earth return. Wire is better than rod cos it's flexible (can be pushed into the corner). I glued it in with gel Gluper Sue WHEN all connections were soldered and tested. The LEDs are standard domed lens types. I ground the tops flat and painted the tops with several coats of matt black until it was opaque. After testing I closed off the mast with some plasticard and fitted ladder rungs made of copper wire. I also added the missing antenna cables to the bottom of the VHF IMM antennas, 0.5mm brass wire. (Some time I'll also fit the missing GPS antenna and anemometer.) Then painted the mast matt black. I then turned my attention to the searchlight and red/green NAV lights. First I stripped the wheelhouse roof and painted it white as in the original. On my model it was grey🤔 Then I drilled out the searchlight to accept a 5mm Bright White LED. You won't have to do this cos you have a later version with lights, mine had none 😭 Then had to paint the searchlight with several coats of matt black. Otherwise it just glowed all round! Pics show construction stages and finished lighting effect. All wires inside the wheelhouse roof I super glued to the ceiling and ran them down inside the funnels (stacks to you guys across the pond!😉) ready for connection to a switch board in the hull. While I was at it I rubbed the false Southampton name off the cabin using a 1000 grit Tamiya sponge and am preparing inkjet printed decals with the correct Wyeforce name and logo. Have fun getting all lit up Pete,😁 Cheers, Doug 😎 PS Attached some pics showing the original 'Southampton' 😉 and making obvious what's missing on the model 🤔
I am using the short thread glow plug. It turns out that glow plugs have a very fine thread. I think it is 1/4" x 40, National Extra Fine. Barrel is just K&S brass stacked and soldered up a few layers thick. I light it with two NimH for 2.4V and a micro switch stuck on a servo. You need to let it off quickly or it will burn up the glow plug. One battery seemed a little weak. I know it will work well for depth charge throwers. Depth charges themselves will just be lost. It takes a bit of time to reload. I never tried it, but someone suggested using premade ammo made from paper soda straws. It might work. You have to be careful with this!
Like many people, I originally built a Model Slipway 1:16 Tamar with the recommended brushed motors. Most of us switched to brushless motors for a number of reasons... 1. short battery duration using NiMHs, or an SLA with brushed. 2. These ALBs have an on-Service speed of 25+ knots and for scale speed, only brushless motors and LiPos can sensibly provide the power and duration. Model Slipway converted their demonstrator to brushless.