I got a new speed record! DIY RC boat twin motor build.
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- Опубліковано 29 гру 2023
- Download the plan here: drive.google.com/file/d/1YUxa...
Second run of my DIY RC Boat Build. Fine-tuning the setup and trying to get a record top speed.
This is my dual motor / twin motor Mono boat. It is made from wood and carbon fibre.
Boat spec:
Length: 850mm or 33.5"
Width: 245mm or 9.6"
Esc: 2x 150A Flycolor:
s.click.aliexpress.com/e/_Evx...
Motor: 2x Rocket 3670 1850kV:
s.click.aliexpress.com/e/_Eyu...
Lipo: 2x CNHL 6S 3000mAh 100C
Drive: dual DIY stingers
Props: 43mm 1.6 pitch
Speed goal: 140 km/h or 87.5mph - Навчання та стиль
Great job!!
Thank you, Jumping Jacks!
As always great video, boat seemed very planted with larger prop i think there is great potential there. Try sliding the liner towards the motors and apply a little clear RTV on them and them pull them back, it should seal and glue them in but not enough that you pull them back out.
Thanks! I agree, very stable running with the larger props! They seem to push the bow down a bit more. Will be continued 😎✌️
Great way to end up the year! Congreats. Funny enought I also yesterday put my 3rd prototype to the water, with a bit less sucess. Thank you for the inspirations and keep them coming. Cheers
Thanks José! Too bad your maiden run went less fortunate. What was the cause?
More content to come for sure in 2024! Cheers ✌️ DJ
@CozyRC Hi there. I'm "designing" my own outboard motor, that is accommodating a 3652 brushless motor. That comes with some challenges. As much as I try to 3d print stuff with tolerance and resistant materials, small plastic parts aren't that durable when brushless motors and copper gears are involved. A shaft support broke after a couple runs. Left my boat stranded a couple of yards out of ritch of the lake shore. 🙄Having to retrieve it with a water temp just abover frozen wasn't fun... The tunnel boat body itself works great tho.
@NoMatterDesign Interesting project and challenging indeed! A geared RC outboard is very hard to make for high-speed applications. You could try to make one with a flex shaft. It's less scale, but more durable! ✌️
@@CozyRC Crossed my mind. And after so many... "rapid unscheduled disassembly" cases I should. Thing is I have some people in the UK (my fomer RC club) who are only interested in geting my design if it works with rigid shafts and costs less than £25. I'm getting close lol. The 1/10 scale "Mercury 360" I'm copying is a challenge. But the 1/5 of the same shape seems to work quite well.. Yes I also have a 1/5 tunel boat in the works. I'm at the moment putting more effort on looks than speed. But with the use of 3D printing for carbon forging mold parts... that might change soon.
@NoMatterDesign Sounds like you got some nice projects going! Enjoy and Happy New year 👍
Hi friends, what size is this flixble shaft and propeller...🙏
Hi, I use 4.76mm flex shafts and the propeller sizes between 42-44mm with a pitch ratio between 1.4 and 1.9
@@CozyRC ua-cam.com/users/shortsCJu9noVsWJA?si=2DcqJaPHTRhY7TV7
@@CozyRC I want to build this with a 4mm flexible and a 37mm prop, will it hold up well with a surpass hobby 3670 2650kv motorbike?
@@CozyRC plan with 2 motorbikes
Hi Ahmad, that setup will be good on 4S. For 6S lipo, I recommend 1800-2000kV range.
4mm flex shafts will be ok I think, if you use smaller props, like you propose.
I share the plan for €5,-. If you're interested, please send me an email at cozyrc1@gmail.com
I wonder if the batteries can really offer 300A burst🤔I know the small motors can deliver very high speed ,but for SAW this 1850kv they are use on 8s (but 40 mm motors whit +2200-2600kv)
For exemple in my twin cat sss3660/3570 motor and same props copy ABC 1716
- 2s 3570kv 90kmh (26400 rpm onload)
- 3s 3570kv 120 kmh (39600 rpm on load)
- 4s 3570kv 140 kmh (52800 rpm on load)
Your setup have 41000 rpm on load I think it's not enough to reach higher speed I think you need more rpm and much stronger battery .
Please don't get me wrong G-FORCE it's amazing I love it, already run very stable for a twin mono and I love the cornering ability.
Turnfins bring drag rise them a little bit.
ua-cam.com/video/8AnZ84UbVIk/v-deo.htmlsi=aUCv9LGCViSmGDjd😊
Hi Daiciu, Thank you for your extensive answer. These lipo's can't deliver 300A. Any lipo claiming more than 60C drain capacity is probably not true.
I'm aware that for a true SAW boat, my setup is not suitable. Too low rpm, but I did that on purpose. With this speed, it is much easier to get to know the boat and learn about setup. I became more careful after the Wildthing Crash!
I planned from the beginning, a motor upgrade, if the hull would perform well. I like TP motors, but 2x €95,- is too much for me. I will probably go for 2x SSS 3674 2075kV motors. If I can reach 140km/h, my goal for this boat is to be reached. I guess I can come close with these motors and good lipo(s).
Regarding twin lipo's: my theory is that it is better to split the total current from the twin motors. If 1 lipo needs to deliver for 2 motors, twice the current will flow through the lipo wires and connector.
The 3000mAh lipos I use, might be little low capacity and therefore, their voltage might drop soon. But they are light, which I like about them. I will test a single CNHL 5200mAh 90C lipo soon. Maybe the boat will be much faster? That would prove the 3000mAh twin lipos are not a great setup.
Finally, I think I can push the current setup to 120km/h. It's a great boat and I enjoy the building, running and tuning process a lot! See you ✌️ DJ
@@CozyRC the yellow pair have more top speed than red ones ,at least that what I see on video even the gps show the same speed,maybe you can try more whit them.
The 70C Gplus series have better chemistry,but we play whit what we have 😊
@daiciuapostol79 The red props are very aggressive and reduce the motor rpm. I ran them without sharpening. I now sharpened and balanced them. I will use 1mm more uptrim on the stingers. I think I can get 120km/h with them.
The golden props will be tested more as well! Let's see next time 👍
@@CozyRC 🤞let's see😁