RE: RC Surfer (Full Version)

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biglenn -> RE: RC Surfer (5/30/2008 12:45 AM)

how do i get the plastic motor coupler off the original prop shaft on the NQD model? Its on super tight - is it glued? Do i need to get a new prop shaft?



jocktime -> RE: RC Surfer (5/30/2008 5:56 AM)

biglenn,
I used a Dramal tool with a small cutting blade and put a few cuts in the plastic coupler,
then pealed it off. Then bought a new coupler from Tower Hobbies. No need to
change the shaft.
Jocktime



wbf1mad -> RE: RC Surfer (6/2/2008 7:52 PM)

i have an orignal lisa - this year decided to up the motor and use a water cooled esc. she works fine and a lot more speed but the minute you hit full throttle the esc kicks in? any sugestions? im using the 19 turn motor by RCSURFER. the power is there just she cuts for a few seconds the minute apply full throttle. yet out the water she runs fine. esc is a high spec to handle the battery packs as learnt after melting me first one, smoke every were [:D]



dacaur -> RE: RC Surfer (6/3/2008 2:45 AM)

what ESC is it?



SURFMIKE4 -> RE: RC Surfer (6/3/2008 4:09 AM)

here my boardshark rebuild to work it selfright it all good i cut the surfer off the lid an move it forward 19 turn motor mic swicth for power on only an a volts reguerlater 5v for the reciver add lead under the front part of the battery new rudder sevor



wbf1mad -> RE: RC Surfer (6/3/2008 11:35 PM)


quote:

ORIGINAL: dacaur

what ESC is it?




hi its this one

http://www.ripmax.com/item.asp?itemid=P-XTRA-SESPRINT&Category=060-050

cheers



dacaur -> RE: RC Surfer (6/4/2008 2:51 AM)

all I can think of is to make sure you have water going through the heatsink... where is your water pickup? The way you describe it, it sounds like the esc just cant handle the amp draw when you hit full throttle. There is way more resistance to the prop turning in the water than in the air, which would explain why its fine when its out of the water... looking at the specs for the price of that ESC, I would say its probably pretty cheaply made, not cheap like inexpensive, cheap like crappy.... Those are some pretty high numbers for such a low cost esc... If it were made by a reputable company I would expect it to cost $100 at a bare minimum.... So either the esc is not actualy able to handle what its "rated" at, Or you just got a defective one...
You might also try swapping out the motor, but I suspect the esc is the problem,



BigWaveMax -> RE: RC Surfer (6/5/2008 10:20 AM)

My latest creation, Any Questions?



BigWaveMax -> RE: RC Surfer (6/5/2008 10:50 AM)

Here are a couple more shots. I finally got this thing perfected and ready for market after 2 years of R&D. Enjoy the learning curve and plan on spending lots of money, if you are as hooked as I am.



wbf1mad -> RE: RC Surfer (6/6/2008 12:35 AM)


quote:

ORIGINAL: dacaur

all I can think of is to make sure you have water going through the heatsink... where is your water pickup? The way you describe it, it sounds like the esc just cant handle the amp draw when you hit full throttle. There is way more resistance to the prop turning in the water than in the air, which would explain why its fine when its out of the water... looking at the specs for the price of that ESC, I would say its probably pretty cheaply made, not cheap like inexpensive, cheap like crappy.... Those are some pretty high numbers for such a low cost esc... If it were made by a reputable company I would expect it to cost $100 at a bare minimum.... So either the esc is not actualy able to handle what its "rated" at, Or you just got a defective one...
You might also try swapping out the motor, but I suspect the esc is the problem,



cheers, ill take it back. i did say if it could not handle the job id be back for a refund.



biglenn -> RE: RC Surfer (6/8/2008 11:43 AM)

After the rudder assembly came off and let aload of water in the crappy stock electrics gave up and the motor seized after a week of not using it! so finaly got it together and out with the old and in with the new.



007gb -> RE: RC Surfer (6/17/2008 1:11 PM)

Hi guys, great forum & loads of useful advice.

I too have bought an NDQ on ebay for £25 and was suprised it worked and surfed out of the box - absolutely great fun.....for a while! As expected after only one 3300nimh battery pack the electrics & motor burnt out!!

So following the advice here I've gutted it, waterproofed and have rebuilt with a hitec servo, mtronics marine esc, 19T motor and improved cooling but am having trouble with the motor coupling.

biglenn - notice you are using an NDQ, what coupling did you use for yours?

Ideally I want to use the same motor mount so coupling can't be too big. I have picked up one end of a coupling from a local model shop (similar to the 3.2mm plain coupling insert here - http://www.cornwallmodelboats.co.uk/acatalog/couplings.html) but it's not ideal as the grub screw part attaches to the motor shaft but the other end needs to be glued/fixed to the prop shaft (I have dremmeled the plastic off so just have the ribbed end of the prop shaft).

Does anyone have any suggestions for how to fix this to the prop shaft i.e. what glue / fixing material to use? Alternatively can anyone recommend a coupling that will do the job? Both motor and prop shaft appear to be 3.2mm.

Thanks in advance for your help.



biglenn -> RE: RC Surfer (6/18/2008 2:46 AM)

007gb - I have exactly the same problem. i've gutted it and fitted all my nice new gear but the motor coupling kept coming loose on the propshaft end - Its 3.2 both ends attached with grub screws that i picked up in a local model shop. I thought maybe some threadlock or something may do it? Or maybe grinding a flat in the propshaft like the motor? Would this work? Small problem with alignment too, maybe a UV coupling would sort that?

Wheres the best place to get new props in the UK? The model shops where i live only stock out of the box stuff.



dacaur -> RE: RC Surfer (6/18/2008 2:59 AM)

yea grinding a flat on the shaft would definatly solve the problem, I would do that AND threadlocker...



MiFi -> RE: RC Surfer (6/18/2008 11:12 AM)

grinding a flat definitely works....got this information from german rc-forum....

micha



007gb -> RE: RC Surfer (6/18/2008 11:30 AM)

Thanks for the responses guys,

Biglenn - so what coupling did you get that fitted and had 2 grub screws and where was it from? My problem is that I have to glue one end as I only have something with one grub screw - that lasted for 5 mins before coming unstuck! That was with super glue but I've now bought some metal glue to see if that would hold it longer?! A little optimistic I know.

The chap at a local model shop that specialises in boats got a UV coupling for me to look at but they're much longer so new motor mounts would need to be installed and it pushes the motor into the space where the electrics need to be. They did have a good selection of boat spares/parts so you may find props here or at least they can order them - http://www.westbourne-model.co.uk/

Thanks to dacaur & MiFi endorsing the grinding of a flat spot on the propshaft - seems to be the way to go.....if only I could find a suitable coupling......



007gb -> RE: RC Surfer (6/18/2008 12:37 PM)

Think I have found what I need:

A Graupner 3346 - Coupling Sleeve 3.2mm, looks like it has 4 grub screws so with some locktite should hold firm!




biglenn -> RE: RC Surfer (6/18/2008 10:29 PM)

thats the one 007gb, except mine only has 2 grub screws. Was only a couple of quid. got it from a local model shop.
Bought some thread lock and gonna grind a flat in the shaft i think.
Will let you know how i get on!



Paolo.75 -> RE: RC Surfer (6/18/2008 11:51 PM)

My Kyosho dude also suffers a little problem with alignment, a bit of salt water came in through the motor shaft, I had fill the hull with pieces of sponge.
The better way is change to flex transmission like the Graupner GR 1974



biglenn -> RE: RC Surfer (6/20/2008 12:29 AM)

ok i grinded a flat in the shaft and locktite on the screws. Waterproofed the shaft tube best i could - Looks bombproof now but will let you know when i hit the water! Fingers crossed! Surfs flat for at least the next week so the real surfboard will have to make way for the Minisurfer - hope he shreds!



jocktime -> RE: RC Surfer (6/20/2008 5:05 AM)

Hello SURFMIKE4,

I have two Lisa Mods and want to mod a Board Shark I have,
that I never used. I have some questions about your Board Shark Mod,
that you might possibly answer for me.

First, what servo did you use and where did you get it.
(I noticed the difference in servo size.)

Second, what motor coupler did you use and where did you get it.
(I'm always looking for a good coupler.)

Thanks for any help on these matters, Jocktime [;)]




tunda -> RE: RC Surfer (6/20/2008 12:36 PM)

Heres some pic of my brushless lisa



surfcurls -> RE: RC Surfer (6/21/2008 12:11 AM)

Cool Set Up Tunda,

What brand and size motor are you running and ESC, Looks like a Jeti ...



surfcurls -> RE: RC Surfer (6/21/2008 12:15 AM)

Hi Paolo,

On your web site you have a pic of a motor set up, Hi Tec servo / receiver, and an ESC.

What size and brand ESC are you using with that six cell NI-MH battery set up ?



Paolo.75 -> RE: RC Surfer (6/21/2008 12:23 AM)


quote:

ORIGINAL: surfcurls

Hi Paolo,

On your web site you have a pic of a motor set up, Hi Tec servo / receiver, and an ESC.

What size and brand ESC are you using with that six cell NI-MH battery set up ?



Hi, the ESC is a Pulso DLB-60 Opto that I brought on ebay last year...the battery pack is seven cell, GP 3700 or Grepow 3300.



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