1S boat

[Feboat]

Hi, has anyone here run a fast boat on 1S lipo? Here in the UK we have several 1S classes on the books but no one has attempted it. I guess getting a good high kv motor would be a good start, but any advice would be welcome.

[slowcoach]

Hi
I think there are some 1/12 scale 1S cars have a search and find what they use. Best of luck.

[Doug Smock]

Darin Jordan has some experience with 1cell boats.

http://forums.offshoreelectrics.com/...4-Darin-Jordan

Shoot him a PM if he doesn't catch this thread.

D.

[Feboat]

Thanks guys, I'll leave it a couple of days then PM him if he doesn't pick upthe thread.

[StevenBryant]

Hey Feboat,

12th scale or LMP12 cars run motors of around 7500rpm/v in mod and 5000 rpm/v in stock. I did have a play around with them a few years back when quit racing LMP12, and to be honest i didn't have much success with car motors. You may have better success if you can find a motor better suited to boats

steve

[Feboat]

Thanks, I have been looking at some 9000 kv motors, but they are pretty small so I guess not much torque at that kv. Heaven knows what size prop would work with that.

[slowcoach]

Hi fe boat
How about this motor seems just about suit 1s
Turning Trackstar 4.5T 7330kv
Regards

[StevenBryant]

When i tried 1s i used a Nosram 4.5T 7500kv, GM 10.5T and a Thunderpower 8.5T, the biggest problem i found was the lack of torque my motors had.

[Feboat]

Yes I guess torque is going to be the problem. Any body know of 7000 + kv out runners.

[Feboat]

I suppose I could try the old route and use a low wind brushed car motor on a Hughey gearbox. I still have a couple. Weight will be the problem there I think and the fact that the rpm would be a bit low.

[slowcoach]

Hi
What an interesting topic, it appears that inrunners have the revs but little torque and the outrunner have more torque but lacks the revs. Excuse the pun but aren't all 1S racers in the same boat.

[Darin Jordan]

One of the biggest issues with 1S boats is a lack of ESC support. Most FETs won't operate below 3.5V or so, and when you put a 1S cell under load, you are getting very near that threshold.

I had decent success using the Hobbywing XERUN 120A ESCs that were available a few years ago. I think they have a newer version now.

Using this ESC I got my 1S SAW Hydro into the low 70's on a consistent basis. Was pushing the ESC WELL beyonds it's practical limits, however. Without employing ALL of the little tricks that I've learned over the years of attempting this (and NO, I'm not going to reveal them here... ), the ESC wouldn't have survived. Pulling over 165 Amps through an RC Car Controller isn't something you just DO!

You aren't going to break any records using ANYTHING conventional to make this happen. Bill Oxidean currently holds the 1S Hydro record here at 71.656mph, and he was able to do that with a NOVAK system and a VERY specially built tiny little carbon fiber hydro. November 2013 I was able to get within 0.010 mph of that record using my XERUN 120A ESC and my own Hydro design. Just couldn't quite get the conditions to break the barrier. Water conditions/weather play a HUGE role in this as well. If the water has ANY ripples in it at all, those tiny little 35mm props are simply not able to stay hooked up for the entire run.

Andreas Lehner put on a spectacular show this past November when he pushed his tiny little "Micro Drifter" into the Mid-50's on 1S, setting a new M2-Cat Record of 54.972mph. Again, he was using a Custom Built ESC, of which only two exist in the world and he owns both!

Here are the current NAMBA 1S (M2-Class) records for SAW. My Mono record should be able to EASILY be exceeded by someone actually trying. That was just one set of passes at the end of a weekend when I threw a system together an put it into one of my old N1-Mono hulls.

Class Name Date Sec MPH

M-2 Hydro Wilmer Oxidean 12-Nov 3.140 71.656

M-2 Catamaran Andreas Lehner 14-Nov 4.098 54.972

M-2 Mono Darin Jordan 11-Oct 5.468 41.119

[Darin Jordan]

Oh, by the way... If I can get the last of my electronics together before March, I'll be attacking the 1S Hydro record again at the LA SAW event, March 20-22nd at Legg Lake.

I was knocking on the door before, and, if I can get this last piece I need, I think I can put a dent in it this time down.

Here is the hull I custom built for the task.

20141025_222507x.jpg

[ray schrauwen]

Another fine work of art. You are a machine dude!

[ray schrauwen]

May I ask simply... Did you modify the XERUN120? I don't really need to ask what or how.

One of the biggest issues with 1S boats is a lack of ESC support. Most FETs won't operate below 3.5V or so, and when you put a 1S cell under load, you are getting very near that threshold.

I had decent success using the Hobbywing XERUN 120A ESCs that were available a few years ago. I think they have a newer version now.

Using this ESC I got my 1S SAW Hydro into the low 70's on a consistent basis. Was pushing the ESC WELL beyonds it's practical limits, however. Without employing ALL of the little tricks that I've learned over the years of attempting this (and NO, I'm not going to reveal them here... ), the ESC wouldn't have survived. Pulling over 165 Amps through an RC Car Controller isn't something you just DO!

You aren't going to break any records using ANYTHING conventional to make this happen. Bill Oxidean currently holds the 1S Hydro record here at 71.656mph, and he was able to do that with a NOVAK system and a VERY specially built tiny little carbon fiber hydro. November 2013 I was able to get within 0.010 mph of that record using my XERUN 120A ESC and my own Hydro design.

Class Name Date Sec MPH

M-2 Hydro Wilmer Oxidean 12-Nov 3.140 71.656

M-2 Catamaran Andreas Lehner 14-Nov 4.098 54.972

M-2 Mono Darin Jordan 11-Oct 5.468 41.119