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Thanks for your reply. I am more of a speed freak. I love the Vosper /MTB's style hulls as you can really push them to there limits, as I can also with the deep V huntsman style hulls. My Proboat Miss Geico catamaran I can run flat out even on turns. But am unsure about fitting an out runner, I have scaled down the Crash Tender to 28" and have just put in a small outrunner but very apprehensive of running her. This is because i'm unsure of overheating and catching fire. Silly rally as she is a fireboat. But as you have one in your Crash Tender with no problems, then I will finish her off and give her a run. Thanks for your help. I am watching this build as eagerly as I did your wonderful Crash Tender. I cannot wait to see the en result and some video of her on water. I'm sad I wasn't able to get along to the show this weekend.
How does an outrunner fare with heat when closed in? The one you are using is goint to be even more closed in as it has a box built round it. I have been reluctant with an outrunner in a hull for this reason. I have a Miss Geico with an inrunner which is fine as it has a water jacket.
Just renovated this one not been used of several years, I need to get back into sailing, was running on a 400 size motor now on a outrunner Mystery D2632-100 and it seems to go very well, will post it on the water later.
You are correct the coils goes over the body of the outrunner motor but does not touch. it was initially formed around a metal tube but when mounted on the motor mount there is a 'cereal packet cardboard' thickness of clearance around the body of the motor. Steve
Right, just been given some nice bits. Brushless outrunner FUSION 3535/05 1500kv ESC Top Edge 60A water cooled SC060B Plus a coupling. So now to go shopping. Which make of Lipo3 and from where? What type and size of brass prop? Where to buy silicon wires and the fancy gold terminals? Steve
I do have an inrunner, Doug, for my CNC outboard, but the one we're talking about here is an outrunner as it's the outside that spins and the innards which are bolted to a thick bit of aluminium. You can get the idea from the picture. My dear bride has just bought me an early Christmas present of a new camera which, I hope will take pictures clearly when the sun isn't shining. So my pics should improve soon. Martin
Although have modeling experience, all my earlier vessels used brushed motors. This was my first brushless. The model is now running well, but thought, for the benefit of others considering this transition to summarize my experiences. Must stress the performance of a brushless motor is incredible when compared to a similar sized brushed; for a vessel such as this they are almost obligatory. They are worth the trouble! Had been advised that the best powertrain installation for a 37” Brave Borderer is either a single or twin screws, not three. This was good advice! Much heartache could have been avoided with a single screw installation. Unfortunately, that is not the correct layout for a scale builder. Tried three major powertrain iterations, with several variations within each group. All motors are 28mm O/D : 1) The original installation used 3 x 4600kV inrunner motors with 30 A ESCs. Had bought these items used. The motors were too fast and had little torque. The ESCs also did not have adequate capacity. The result was erratic performance, a high fuse failure rate and the eventual failure of an ESC and motor Picture #1. 2) First upgrade was to 2 x 2400kV inrunner motors, using 50A capacity ESCs. The centre shaft was fitted with a brushed motor. This combination did work, although suffered greatly from motor “squeal” and “stutter”. Eventually a motor burnt out and failed. Picture #2 3) Upgrade two: retained the 50 A ESCs, with 2 x 2600 kV outrunner motors, again with the brushed inner shaft motor. Reprogrammed the ESCs to soft start parameters. Much better, performance and reliability can now be considered acceptable. The squeal and stutter are largely corrected It has justified the challenges of getting here. Picture #3 Have tried both 2 and 3S Li-Po batteries, suggest use the minimum voltage needed to achieve the desired performance. Higher voltages translate into faster response and performance, but with less control modulation. The model can be easily overpowered. In summary, from my experience. For a marine application; chose low (under 2000kV) kV rating motors with an outrunner layout wherever possible (produce more torque than inrunners). Use ESCs with a ratings comfortably in excess of the motor ratings, fit fuses to supplement any ESC protections. Ensure the ESCs are programmed to “soft start” characteristics. Also, the obvious check of making sure shaft alignment is correct is even more important with the higher speed capability of brushless motors. In spite of the trails, cost and tribulations of getting here. Have enjoyed the challenge and the end result does justify the means. Also, do not finally fit the deck until you are satisfied with the performance. Making the changes described with limited access would have been very difficult and frustrating.
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 all, here's progress on the Darby One Design. Got these pics just before it started peeing down, so no Chris-Craft pics. Fitted a brushless outrunner I found in a box. Might work, might not... Home made prop shaft/tube, home made off-set rudder. Planked balsa top cover to keep weight down. 1/6th scale 26"long, 10" beam. Thick grey cellulose primer to act as a light filler for scratches, etc. Martin
[Score: 9/10] 29"/1200g Avanti Capable of 15mph and a runtime of 5mins Single Propellor (2 Blade X Type 35mm) Direct Drive to a OBL29/19-15M (2 Blade X Type) Powered by LiPoly (11.1v) 15Amp/h Batteries Controlled Through BLC-40M (25Amps) ESC - Comments: ARTR fast electric by Thunder Tiger. Deep vee powered by Ripper Brushless outrunner. Will reach 30mph+ when flat out. I replaced the radio that came with the boat with stick operated Futaba T2HR as I preferred "stick" to wheel for sailing fast boats. Initial problem was slight leak where stern tube passes through the transom but soon fixed it with epoxy. Electrics are in a box at the stern which is appears to be water resistant. Though not for a raw beginner, it is great for a second boat especially if someone is hoping to move on to a 6S . If not , it makes a good all rounder and is ideal for club fast electric racing and it performs well when doing tight turns. Boaty