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i did wonder about the shaft it is a little flimsy so thanks for confirming that and the prop, i a still pondering a motor as there seems so little room i looked at a out runner from a aircraft but maybe that would be too quick
depending upon the type of motor cooling it can be a problem. Most brushless motors are out runners so the case rotates! In runners are usually for higher speed applications (or driving a gearbox). If you have an idea as to the size of IC engine the boat was intended to have then this list may be a help .049 or .051 = 100 watts 0.10 = 200 watts 0.15 = 300 watts 0.25 = 500 watts 0.32 = 640 watts 0.40 = 800 watts 0.45 = 900 watts 0.51 = 1020 watts 0.61 = 1220 watts 0.75 = 1500 watts 0.91 = 1820 watts Since Watts are Volts * Amps ( I know this is not accurate for a reactive load like an electric motor but its a rule of thumb) This gives you a ball park next point is the KV ( revs per volt) of a motor. The higher the KV the smaller the prop. Finally buy a Watt meter they are not expensive and give you a chance to " fine tune" a setup. https://www.ebay.co.uk/itm/FT08-RC-150A-Hight-Precision-Watt... Car ESCs ( usually) have a reverse function while the airplane versions do not. They are generally cheaper than boat specific ESCs.
Hi chaps jim dogge here, im just about ready to fit out my wave princess with some sort of motor and bits. I have allsorts of outrunners and ESC to match aeroplanes but havent a clue as to where to start. A 1.5 diesel, whats that equivalant too is the weight thrust formula the same for boats. l would prefer to stay with out runners, the cooling aspect is no problem l did it for a living. a prop size how is that worked out for a boat.
Hi Gerry, welcome aboard 👍 Don't mind some of our crustier Fleet Admirals😉, they mean well and have a wealth of knowledge 😉 First some basics (and forgive me if I'm preaching to the converted but the query was a bit bald to say the least!)! - 1 What experience do you have with RC boats? 2 Brushed or brushless motors? Are you aware of the pros and cons? 3 Battery: are you thinking NiMH or LiPO? Are you equipped for LiPOs, i.e. appropriate charger? 3 I assume you mean the ELCO 80 foot Patrol Torpedo Boat (PTB)? Which at 1:32 would give a model of around 30 inches. Please confirm or let us know what original type the model should represent. 4 Are you scratch building from a plan, or from a kit? If a kit which one? Maker? Sorry for all the questions, but it's like computers; nothing in = nothing out!🤔 Some general rules (I know, rules are made to be bent til' they break!😉) If you go brushed motors there is a neat dual ESC + rudder mixer on the market where you can also connect a third separate ESC for the centre motor, to give that extra OOOMPH at Full Ahead 😊 If you go brushless the basic rule is props no larger than the diameter of the motor. And use an out runner, good torque and SHOVE! Inrunners are mostly for the fly boys 😉 Guideline: last year I bought a 28" LoA model of an ELCO 80 footer PTB from another member. It's fitted with 2 x 28xx brushless motors and 30mm 3 blade screws and 2 x HobbyKing XC-10A ESCs. The builder who sold it to me said it is 'almost uncontrollable'! Whatever you do have fun with it, but if in doubt ASK, before you dump money in the boating lake! 🤔 Good luck and best regards, Doug 😎
Hi. I am building a 35" version of the aerokits RAF fire tender. I am at the point where I need to decide on the electric motor which is appropriate. I would like the vessel to be able to come upon to the plane without to much effort and have a bit in reserve for anxious moments or sheer fun. Do you recommed a brushed or brushless motor and if so what power rating. If brushless either in runner or out runner. Grateful for any advice. Regards Kevin.
Whenever I have asked the question, "I have this size motor to run this size boat, which prop size shall I use?", I am led into the dark science of thrust, pitch, voltage, RPM and many other mysterious forces. The discussion always seems to conclude with "Suck it and see." I have a Turnigy D3536/9 910kv out runner which I want to use in an airboat length 750mm x 300mm beam. The manufacturer recommends a 12x5 prop @ 7.4v and a 10x7 @ 14.8v. I use 11.1v 3cell lipos and cannot find the recommended prop for this voltage. Have any of you knowledgeable fellows any suggestions please? (Apart from the one mentioned above of course.) Thank you. Steve
a 30"scratch built pt. boat, I built hull from .8mm ply using a resized eezebilt 20" plan. the deck fittings were copied as best as I could from photos and drawings found on line. powered by 2- 2200kv brushless out runner motors through 2 20 amp speed controllers. twin contra rotating props twin rudders fast and light a pleasure to build 2
I acquired this boat part built some months ago through Dave M. I have not put too much scale in detail but I am quite pleased with the overall finish. It is powered by two brushless 1250KV out runners and in the first sea trials I used 12v lead acid batteries. (That video was posted a few weeks ago - mdlbt.com/26793). This video shows its second sea trial after I was persuaded to use lipos. The difference in performance is very pleasing. Thank you Dave M for your help and advice during the build.
for sale is my part finish 1/12 scale Trent life boat Speedline kit bought over a year ago work was done off and on ,a fairly good std ,now have lost interest to finish there all the parts to finish her of inc lots of 14 ba nuts and bolts,😁 the paint, enlarged plans, loads of print outs ,there 4 figures inc also 2 brushless out runner motors & esc, viewing is welcome phone 07903765943 cash on collection only ,too big to post😁😁*** I have just sold the Trent it has just been picked up ****thank you all for your interest and kind remarks thank you
[Score: 5/10] 30" Sea Ranger from Aerokits plan Single Propellor Direct Drive to a 2855 Powered by LiPoly (11.1v) Batteries Controlled Through Turnigy ESC - Comments: Still very much work in progress This Sea Sea Ranger is built from an eBay "Aerokits plan" which has some subtle differences presumably to get around copyright. The cabin sides below cockpit window had a reverse curve to the original but it was not difficult to undo this modification Well the sea ranger if now complete finished I a Ford maroon colour Belco paint been on the shelf since the early 90s plus some more before I inherited it, the cabin sides are cream self mix into a Crown paints b/w sample pot. Cabin rooves sprayed with white aerosol. The original motor at 3100kv was far too powerful so a silly little out runner has replaced it.
I'm no fasty expert, more of an all round experimenter. I have an old MFA Avenger (see my harbour).It around 3' and fibre glass. I installed a brushless out runner 5055 700kv.it runs on16.8v reasonably quick. Add another 4.8v and it lifts the front on start up, and quite a speed increase. Think it's going to be trial and error with yours, but these motors are quite reasonable on eBay, and you will of course have 2. I use 55mm x Prop. Motor only gets warm after a good hammering. No water cooling. See what other ideas you get. Stopping a thing of that size quickly may require reverse good luck.
Don't know if this helps. I have a Robbe Topkapi, 20yr old ish. Was geared 600. Now a Brushless turnigy D3536-6 1250kv 490w Out runner. Turnigy 55A controller. Bought for another project but fitted in this. Think models a similar size, just single prop. Good performance, motor stays cool. No water cooling. Prop around 35mm (its a Graupner "S" I think. I will look for its number later)