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I dont uses mixes, but do use exponential and rates (spektrum dx6i) with my twin screw brushless 4 foot fireboat. When at speed rates on, then it turns nicer, no roll, when going slow rates off so turns are sharper, if that makes sense. Mixing the throttles.. interesting not thought of that, but it will lose power/speed. We use mixing on planes for taxiing, particularly on water, but once airborne its off. My avatar has this as the cheapo motors just wont balance so it compensates for this on the water. With the boat its easier to control with rudder input. I like the thinking though!😁
Hi John, you might now be scratching your head, and wishing you have not asked the original question! This seems to be a common issue, as the boating community is light years behind the other disciplines, rc cars, planes helis and so on, its probably due to the facts general boating doesnt really need the later generation technology, the average boater age is probably higher than the other disciplines so budgeting might be an issue, and there is less younger blood in the clubs to explain the lipo/brushless etc. We see posts with a load of numbers, specs, warnings etc, its enough to put people off. Im a big fan of brushless/lipo/ 2.4 etc, been doing it for years, its cheaper and more efficient (once you have the basics) but for the average guy, who just wants to spend an easy afternoon at the local lake gently cruising around, brushed motors, nimhs batteries, even lead acid, will do the job👍 Your 4 foot ply boat, once painted, with fittings, will be heavy, I know, I own one. Those 600 motors are not big enough, they are better suited to the smaller 3 foot boat, then, pushing them with a 6v lead acid, just cant do it. The battery will be screaming HELP!! I started 15 years back exactly the same, 600 motor, 6v battery, massive 50mm prop, I knew no better and took advise from people who didnt know what they were talking about😡, remember those gold hi tech speed controllers!! I had one, it melted, literally melted on the first use😭 Get 700 size motors, they will need to be water cooled, as mentioned by jarvo, the nominal voltage or below isnt good enough, power them at the max voltage. Brushed means you can use one apropriate esc, look out for electronize (are they still in existance?) or mtroniks, preferably use nimhs batteries over lead acid with a high mah. If after all this you want to venture into lipos and brushless motors, go to a club, spot a boat that is similar in size to yours, if you like the performance talk to the owner and gain experience and knowledge that way, it will save money, lost time and a lot of disappointment, I have been there so feel your pain. I say I would never go back to brushed motors and none lipo batteries, but I always want silly speed, not runtime, after 15 minutes Ive had enough and am bored. Rambling over! My 4 foot boat is twin brushless and uses 4 lipo 5000mah cells per motor, it will do 25mph for 15 mins, then I go home😁 Message is, you can get a "reasonable" performance from brushed motors, with the correct batteries, right props, but weight is the enemy. Looks lie you are at Biddulph, get onto Dave M a moderator on here, and arrange to go over to see the crewe and district boys on one of their sailing days, take your boat with you, they will help👍
Peter, Had a look at the Raboesch site, the prop i looked at was the Metric 162 - 17, 40mm dia. As you are looking at a 42mm motor, this should give more than enough grunt. What make of motor are you looking at??? my 46" Crash Tender has twin motors, with 45mm dia props, the motors are from Airtec, a Yorkshire model shop, might be worth a look at their site Mark
Hi Jarvo I also have a 46" Fire boat, but, it's only single shaft as I am the second owner. I am using a L5055-700kv, 4S 5800mah 40C Lipo, 60Amp esc and a 2 blade 52mm prop. In a twin setup a pair of Hobbyking 3639-1100kv on 3S or 4S batteries with 60Amp ESC's and 3 blade 37mm props and if you wish more speed a straight change over to the sister motors the 3648-1450kv but you may have to drop the props back to 2 blade 40mm. Canabus
Hi Mate and welcome to the forum, (mad as hatters!!!) I have built the 46" and before you get to far in you need to decide if your having single or twin motors, and rudders, that way you dont fall foul of bulkheads, and shaft mountings, mine has Graupner 700bb motors on 3s lipos, but i am up-grading them to brushless soon, have the new ESC,s and the motors are on order. Great model to build and sail, attracts a lot of attention. Mark
Props by ChrisG Chief Petty Officer Posted: 2 months ago
Hello Doug Thanks for all of the useful information and yes it is a 'Black Art' and I have been party to some heated debates regarding props on large passenger carrying boats. I was highly amused by the link to 'Raboesh' which if it wasn't a Chinese company should have been. The model I am building is a Rother class lifeboat which will have twin props and a single rudder and I have read that due to the limited swing of the rudder the turning circle of the boat is much improved by having independently powered motors. Not at that stage yet still early days of the build. Thanks again and best regards Chris G
Built one of these a few years ago. Great for tug towing and rescue work. Had an Action mixer at one time and with two separate 6v batteries worked great. I could literally spin in the spot. Moved to twin motor control as I used to fly model planes and was used to using all four stick axis. Not sure a bow thruster will work well on this model as it is so manouverable. Makes into a nice realistic model and I wish I had kept mine. If I were to make another I would make a better seal of the rear deck, it leaks like mad in it's designed fit. I eventually made a raised coaming round the opening. Coming along nicely.
[Score: 8/10] 35"/2700g ILLINI LOYAL Capable of 12mph and a runtime of 60mins Twin Propellors (5 Blade 50mm) Direct Drive to a 775 JOHNSON TYPE (5 Blade) Powered by NiMH (8.4v) 3Amp/h Batteries Controlled Through DIMART 320A FAN-COOLED (15Amps) ESC - Comments: ANOTHER ON THE WAYS: SALVAGED DUMAS ABS HYDRODYNE HULL, 35 X 10 X 2" ORIGINALLY IN THE AMERICAN BEAUTY KIT. MY INTENT IS TO SCRATCH BUILD FROM THIS HULL, A SINGLE-DECK TWIN SCREW LINEHAUL TOWBOAT WITH A FUNCTIONING TELESCOPING PILOTHOUSE. THEY ARE COMMON ON THE UPPER ILLINOIS RIVER WHERE THERE ARE FIXED OVERPASSES OR LOW OBSTRUCTIONS SPANNING THE WATERWAY. THE DES PLAINES AND CALUMET RIVERS IN THE CHICAGO AREA ALSO HARBOR THESE PUSHBOATS. THE PLAN IS TO KEEP HER LIGHT WITH A LOW CG, BUT POWERFUL ENOUGH TO PUSH SOME SCALE WEIGHT; I RECKON 775 MOTORS WITH 50MM 5-BLADE WHEELS WILL SUFFICE. THIS BOAT WILL BE STEERED WITH STANDARD RUDDERS, NO FLANKING RUDDERS, BECAUSE I WANT TO KEEP IT SIMPLE. (K.I.S.S.) I AM STILL BRAINSTORMING THE SYSTEM FOR RAISING/LOWERING THE PILOTHOUSE; POSSIBLY A SERVO WINCH & CABLE OR LINEAR SERVO. A PNEUMATIC RIG IS ALSO A POSSIBILITY I RECKON. SHE WILL BE WEARING THE ORANGE TRIM AND MIDNIGHT BLUE PAINT SCHEME OF MY SHOP-ILLINIWEK MARINE SCALE SHIPYARD. I USE LIGHTHOUSE LED's & MINI SWITCHES FROM THE SEATTLE AREA EXCLUSIVELY, 9V, 3MM. HARBOR MODELS 1.5V WORKING RADAR & MAYBE A 6V WORKING DECK CAPSTAN WILL BE ADDED. SHE IS MY 5TH ADDITION TO THE ILLINIWEK MARINE FLEET, AND WILL OF COURSE PUSH AHEAD THE MATCHING BARGES. GO FIGHTING ILLINI!
Does any one have experience of models with twin motors in the Fairey Huntsman and Swordsman? (Or any boat) Would like what size the model was - what motor(s) were used and prop sizes, and was there any 'mixing' of motor control with rudder control.
Hi JJ. Just a word of warning, your Mtronics esc will not work with brushless motors, also 20amps is close to its limit with twin motors and fairly large props, performance wise, brushless is the way to go, but will need 2 esc's, wont run with one, if your dropping hints to the elves, spec your motors at about 700 watts and 600-700kva great torque with good revs at 7.2v even better at 12v Mark
Hi Neil, You read too much!! 😉 Before you give yourself the work of altering the rudders see how she performs with the twin ESC & rudder mixer. For slow manoeuvring, especially in reverse, I'm pretty sure the rudders will be almost irrelevant, apart of course for controlling the mixer and hence motors. If you use the P94 in Mode 3 you can spin the boat on it's axis😉 The guys with small rudders in front of the props most likely don't have twin ESCs and a mixer. Two maxims: Why complicated when simple works! If it ain't broke don't fix it! I intend to 'suck it and see' first. Whatever you do have fun with it, but don't 'over engineer', cheers Doug 😎
Hi John Glad to hear you have a working boat. The new wiring and ESCs have clearly removed any previous faults in the connection between the battery and the ESCs. It was a beautiful calm day at Boundary Park, Cheshire and I sailed my Perkassa so must have been a good day for fast patrol crafts.