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RE: RC Surfer - 1/30/2008 6:01:09 PM   
tomazte


 

Posts: 7
Joined: 1/22/2008
From: , BRAZIL
Status: offline
quote:

ORIGINAL: Paolo.75

You can use 27mm to 31mm propeller, size depend to rpm/volt motor also, smaller prop 27 or 28 with a 3500 rpm/volt motor, I use a brushless Jeti Phasor motor 15/3 2500 rpm/volt with a 30mm x 1.4 brass prop. With bigger prop the motor and batteries run hotter, and the batteries run time reduced.

Stock motor specifications?? Are very poor dear tomatze! You do the good choiche changing it with a 17 to 21 turns with only few dollars.

Regards

Paolo

Thank you Paolo! Here i´ll pay in Real (our currency here in Brazil...) : ) ...
Excuse-me for my ignorance, but what´s the difference of an motor with 17, to a 21 turn?
For how many volts? How many Ampéres?
Here are some Brushless motors for sale (it´s all writen in portuguese):
http://produto.mercadolivre.com.br/MLB-68813248-melhor-motor-brushless-esc-super-combo-_JM
http://produto.mercadolivre.com.br/MLB-68433927-motor-brushless-eleec28p-l-1050kv-_JM
And what´s the difference of a 3300mha to the 1800mha(stock) battery?

Thank you for any help!

Regards,

Tomaz

_____________________________

RC Surfer!!! The best RC ever invented!!!

(in reply to Paolo.75)
       Post #: 126

RE: RC Surfer - 1/30/2008 9:43:18 PM   
Paolo.75



Posts: 22
Joined: 5/18/2006
From: Oristano, ITALY
Status: offline 		Hi Tomaz,

more turns: - speed, + torque; less turns: + speed but - torque (and more battery consumption).

The motors that you've indicated aren't good, the RC Surfer needs a motor between 2500 and 3500 rpm/volt. Are very good: Mega 22/20/2, Hacker B40 series (8L or 9L), Jeti Phasor 15/3 or the cheap Feigao that you can find on http://www.offshoreelectrics.com/.

If the RC surfer goes for 10 min with a 1500 mha battery, it will go for 20 min with a 3000 mah one! I use a GP3700 7 cells, I usually run for about 25 min putting gas when the good set arrive only, and returning on the line up at 1/2 gas....let see my video: http://www.youtube.com/watch?v=IWQuv1P-kX4

Regards

Paolo

_____________________________

www.paolocarta.3000.it - surfing photos in Italy
www.surfradiocomandato.4000.it - my RC surfers

(in reply to tomazte)
       Post #: 127

RE: RC Surfer - 1/31/2008 2:16:02 AM   
gnarbrah


 

Posts: 11
Joined: 12/31/2007
From: orlando, FL, USA
Status: offline 		Thanks for the info - I definitely plan on taking some more time to waterproof as you suggested. I'm thinking of getting a 19 turn motor for it but honestly I've been out of the rc gig for years, the last electric thing I had was the original RC-10 with the mechanical speed control. I've seen a million 19t motors out there but I have no idea what to get. Any thoughts on a decent one? I don't want to spend a ton if I can avoid it.

Secondly, as far as cooling the esc, I planned on doing that but honestly after running it pretty much wide open in the lake for the test run till the stock 2000mah nicd died the esc was definitely cool to the touch. Is this going to change with a 19t motor and a 3800mah nimh?

Third for gallopaway - The transmitter is my old Futaba FM with the standard $10 3 channel FM receiver and the servo is just a standard Futaba. I figure all its doing is turning that little fin and so far it works great. As far as mounting everything, I just used 2 sided sticky tape foam stuff from the hardware store. The servo moves a bit but it doesn't seem like its going anywhere. Does anybody have any better suggestions?

Thanks for your input, I'll post new pics as I make changes

(in reply to tomazte)
       Post #: 128

RE: RC Surfer - 1/31/2008 10:09:24 AM   
Gallopaway


 

Posts: 8
Joined: 11/26/2007
From: , SOUTH AFRICA
Status: offline 		Thanks for the info - i will definately give it a shot, i havnt been able to use mine for over 3 months now as it came with a faulty servo.
one question though, i unscrewed the white box above the motor(which i assume as the receiver in) and saw that there is not much leeway between the white box and the motor and there is lots of glue etc, so i cant really see whats going on there - did you just cut the wires and pull the box off?

thanks
mike

(in reply to gnarbrah)
       Post #: 129

RE: RC Surfer - 1/31/2008 4:42:19 PM   
gnarbrah


 

Posts: 11
Joined: 12/31/2007
From: orlando, FL, USA
Status: offline 		Yeah, you're much better off gutting it completely. It gets slightly tricky once you pull off that stuff above the motor. There's a circuit board which is probably the receiver, speed control, safety (prop only moves when its in water, thats those two screws with the little green wires going to them) mounted right to the front of the motor which takes a little coersion to get out. I ended up just bending it back and forth till most of it broke then got in there with some dykes and cut out what was left. I'm assuming you're going to put a esc in right? If thats the case don't worry about hurting anything, its all going in the trash anyway. Just watch the 2 little tabs on the front of the motor that you need to solder the new esc to. After all this is said and done (look at my previous pic) you'll see its going to be alot easier to work on, change out motor and whatever else. Not to mention it will actually work!

Post some pics as you go if you can

btw - I'm still hoping for some good info on which 19t would be good (without breaking the bank) I saw a kimodo dragon for like $30 on tower. Is that any good?

Thanks

(in reply to Gallopaway)
       Post #: 130

RE: RC Surfer - 2/1/2008 6:38:32 AM   
Gallopaway


 

Posts: 8
Joined: 11/26/2007
From: , SOUTH AFRICA
Status: offline 		hey thanks alot for the info, i take it that your prop now turns when it is out of the water?
excuse my stupidity but what is the ESC for?
also did you extend the rod that goes from the servo to the fin?

your setup does look much better, will try gut my surfer this weekend

(in reply to gnarbrah)
       Post #: 131

RE: RC Surfer - 2/1/2008 5:49:53 PM   
tomazte


 

Posts: 7
Joined: 1/22/2008
From: , BRAZIL
Status: offline
quote:

ORIGINAL: Paolo.75

Hi Tomaz,

more turns: - speed, + torque; less turns: + speed but - torque (and more battery consumption).

The motors that you've indicated aren't good, the RC Surfer needs a motor between 2500 and 3500 rpm/volt. Are very good: Mega 22/20/2, Hacker B40 series (8L or 9L), Jeti Phasor 15/3 or the cheap Feigao that you can find on http://www.offshoreelectrics.com/.

If the RC surfer goes for 10 min with a 1500 mha battery, it will go for 20 min with a 3000 mah one! I use a GP3700 7 cells, I usually run for about 25 min putting gas when the good set arrive only, and returning on the line up at 1/2 gas....let see my video: http://www.youtube.com/watch?v=IWQuv1P-kX4

Regards

Paolo

What about this one(?):
http://produto.mercadolivre.com.br/MLB-69201555-motor-brushless-mystery-3000-30a-escpronta-entrega-_JM
It is 3000 rpm/V. Is it good for my surfer?

_____________________________

RC Surfer!!! The best RC ever invented!!!

(in reply to Paolo.75)
       Post #: 132

RE: RC Surfer - 2/1/2008 6:37:57 PM   
Paolo.75



Posts: 22
Joined: 5/18/2006
From: Oristano, ITALY
Status: offline 		No it's no good, it's too small....don't check rpm data only, there is class type also....choose a motor that I mentioned above.



_____________________________

www.paolocarta.3000.it - surfing photos in Italy
www.surfradiocomandato.4000.it - my RC surfers

(in reply to tomazte)
       Post #: 133

RE: RC Surfer - 2/1/2008 7:30:41 PM   
tomazte


 

Posts: 7
Joined: 1/22/2008
From: , BRAZIL
Status: offline
quote:

ORIGINAL: Paolo.75

No it's no good, it's too small....don't check rpm data only, there is class type also....choose a motor that I mentioned above.



The problem is if I´ll find it here in Brazil...
I´ll look for!!! Thank you, my friend!!!

_____________________________

RC Surfer!!! The best RC ever invented!!!

(in reply to Paolo.75)
       Post #: 134

RE: RC Surfer - 2/1/2008 9:03:27 PM   
gnarbrah


 

Posts: 11
Joined: 12/31/2007
From: orlando, FL, USA
Status: offline 		Gallop -

I just replaced the servo linkage to the rudder. Any hobby shop will have them or you can probably get a stiff piece of wire from anywhere thats about the same size. Just unscrew it from the round hole on top of the rudder and make a "z" bend (mines lame, but it works) for the servo end of it. ESC is electronic speed control. If you're going to buy one I'd look at the water cooled ones, not super cheap but better in the long run. I just got mine (the pink thing with all the wires coming out of it) from a buddy free so the price was right. Put pics up as you go, I'm interested to see how other "Board Sharks" turn out.

(in reply to Gallopaway)
       Post #: 135

RE: RC Surfer - 2/1/2008 9:16:21 PM   
BigWaveMax


 

Posts: 10
Joined: 1/17/2008
From: Laguna Beach, CA, USA
Status: offline 		gnarly,

put some more weight on the front so it will carve better. how did you secure the surfer?

(in reply to gnarbrah)
       Post #: 136

RE: RC Surfer - 2/1/2008 9:18:32 PM   
BigWaveMax


 

Posts: 10
Joined: 1/17/2008
From: Laguna Beach, CA, USA
Status: offline 		Paolo, how do you keep the motor from over heating?

(in reply to Paolo.75)
       Post #: 137

RE: RC Surfer - 2/1/2008 9:23:55 PM   
BigWaveMax


 

Posts: 10
Joined: 1/17/2008
From: Laguna Beach, CA, USA
Status: offline 		Poalo,
I'm using a mtronics plasma sport plus 4400kv with a genesis sport plus60amp brushless esc.
I water cool everything but I still overheat and shut down too many times per session. I also use a 4800 nimh.

(in reply to Paolo.75)
       Post #: 138

RE: RC Surfer - 2/1/2008 9:33:53 PM   
Paolo.75