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Model Forum / Radio Controlled / Water Models / December 2003



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Need help withr Rudder linkage...PLEASE!

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tenover - 19 Dec 2003 17:04 GMT
Hi....
This is my first post in the boat section, but I frequent the Slop
forums all the time....I've never had any kind of water craft before
and a friend and I picked up a couple cheap RC Surfers to try an
modify.  I have 2 problems left:

1.) Getting an airtight seal.  Should there be NO water when you remov
a hatch, not even a few drops....Or is that "normal" to have a fe
drops here and there in boats.....???

2.) This thing came with this little motor to control the rudder and
tore that out and am replacing that with a Hitec HS-85MG servo.  No m
problem lies in understanding how to link the servo to th
rudder....Here's a very rudimentary drawing of how it's set up and wha
I need to do.  I have all the tools I need to do anything, but a
clueless on how to design something that will work.  
Here's what I have, and ANY suggestions would be helpful.

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tenover - 19 Dec 2003 17:05 GMT
This is what I was thinking, if I can somehow find a way to attach
servo horn or something to the plastic rudder.....would this provid
enough throw?

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tenover - 19 Dec 2003 18:11 GMT
Yes, I'm a newbee.....Man, I didn't think I'd run into anyone I "knew
over here in the boat section

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William A - 19 Dec 2003 17:20 GMT
What are you ?, a newbe ? :)

Just set it up like an 'air' control surface

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William A - 19 Dec 2003 20:49 GMT
Does it already have a water tight linkage pass-thru ?
A simple inner+outer brass tube set-up should work.

Toughest part might be getting a good horn to rudder adhesion

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tenover - 19 Dec 2003 21:24 GMT
That's exactly what I'm trying to figure out now.....The hole throug
the hole is DEFINITLEY not water tight.  I suppose I can either "pot
the shaft with eopxy in the hole or use silicone for that, no

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harry m. - 19 Dec 2003 22:19 GMT
First get rid of the circle on servo and put an arm on it but don't pu
screw in till after centering is done. Use the outside hole on arm an
on the rudder make the hole about 3/8" from rudder which will turn mor
with hole close to rudder. Where the wire goes thru the boat fro
rudder to servo get 1/16" hollow plastic tubing from hobby shop an
when done with that put grease in plastic tube around wire and nea
grease into it to keep water out. You can use the yellow ribbed gol
and tie for airplanes which is the same size . Remember to put outdoo
goop around tubing inside and outside and let dry for a day. Send m
you're email and i will send a close up of mine!

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martin richards - 19 Dec 2003 23:46 GMT
Where did the photo go?:confused: try:
http://www.astecmodels.co.uk/products.php?posted=1&selection=accessory
towards bottom of page

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JoeR - 31 Dec 2003 12:01 GMT
Tenover,

Any more progress?  What components (motor/ESC) are you going to put i
your setup?

I am still trying to figure out an ESC for mine.  The CC Phoenix marin
seems to be nice but at $180 is too pricey.  The other Phoeni
controllers don't work with a pistol grip controller.  I still need t
check out other brushless controllers.  I have a couple brushles
motors that I will try to start.  Hopefully one will work.

Perhaps the best alternative would be to just run it stock- on/of
motor switch controlled by a servo and all and see how it works.

I did just get some hatch sealing foam tape from the local marine stor
to replace the stock foam that people complain about.

The temperature is suppose to break 40 here toward the end of the wee
and there is no ice buildup on Lake Michigan yet...  Better get tha
foam tape installed and a battery pack made up.  Just wish I had som
waders

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harry m. - 20 Dec 2003 01:11 GMT
They aren't worth the powder to blow them up cause they tear real eas
unless you insert the whole unit from inside and just have the nibbl
showing. been there , done that! They are very expensive and the las
year have gone up 100% in price, no way Jose

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JoeR - 22 Dec 2003 21:42 GMT
So tenover, you got me so geeked about this surfer thing that I had t
get one.  I got a Kyosho Surfer Dude.  I am curious if anyone has put
brushless motor in one?

I don't like the on off switch controlled by a servo and would like
ESC with BEC.  Rather then buy a brushed ESC I would rather put th
money toward a brushless motor and ESC.  Any advice anyone

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harry m. - 22 Dec 2003 22:17 GMT
What i think , is the brushless motor maybe be to powerful for th
surfer and i would email the manufacturer and see what they have t
say. One item is you're wallet better have deep pockets cause they ar
not CHEAP. An alternative maybe a Chameleon 2 #2110 with 33,000 rpm an
use a brushed Rc-hydros esc without a bec due to radio interference
and also go to fm tx and fm rx and then maybe a bec will work if radi
grade is very good, it makes a difference

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JoeR - 22 Dec 2003 21:42 GMT
So tenover, you got me so geeked about this surfer thing that I had t
get one.  I got a Kyosho Surfer Dude.  I am curious if anyone has put
brushless motor in one?

I don't like the on off switch controlled by a servo and would like
ESC with BEC.  Rather then buy a brushed ESC I would rather put th
money toward a brushless motor and ESC.  Any advice anyone

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harry m. - 22 Dec 2003 22:17 GMT
What i think , is the brushless motor maybe be to powerful for th
surfer and i would email the manufacturer and see what they have t
say. One item is you're wallet better have deep pockets cause they ar
not CHEAP. An alternative maybe a Chameleon 2 #2110 with 33,000 rpm an
use a brushed Rc-hydros esc without a bec due to radio interference
and also go to fm tx and fm rx and then maybe a bec will work if radi
grade is very good, it makes a difference

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tenover - 22 Dec 2003 23:48 GMT
Hey Joe....
Man, you're stoked!  Wish I could get my hands on one of the Kyosh
Surfers.  Lots of guys are using brushless motors in them with grea
results, along with a 3300mah NIMH, getting around 20 minute runtime i
the surf.  I have one of the so called "cheap" ones, but I think i
looks waaaay better than any others I've seen, and I've already bee
modifying it so much that I think it will hold it's own.  Here's som
REALLY good links I think you'll enjoy...

'Here's my all around favorite....rcsurf.com' (http://rcsurf.com)

'Here's a good one with lot's of info an
\"how-to's\".......surfrc.com' (http://www.surfrc.com)

'Here's one from Australia that has AWESOME pictures an
videos...You'll be shocked at what these little things can do in th
surf!' (http://www.rcsurfing.net/)

'And here's one dedicated to your Kyosho Surfer Dude....
(http://www.rcsurfers.com.au/home.htm)

And last but not least, here's a picture of my guy, with my custo
painted wetsuit.....He comes just with trunks and no shirt

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William A - 23 Dec 2003 00:13 GMT
How 'bout a pic of that rudder mod your doing ?

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tenover - 23 Dec 2003 00:43 GMT
It's still an issue....Where the rudder comes out of the upper hole
inside the surfboard, I will only have a bout 1/4" to play with unles
I dremel some of the board material away so that the hatch will fi
down into the slot.  
Here's the first pic.....This is looking towards the rear of the board
where the rudder will come out (Last hole at the rear center of th
board...

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tenover - 23 Dec 2003 00:44 GMT
Pic2...Close up of rudder hol

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tenover - 23 Dec 2003 00:45 GMT
Here's a shot of the bottom of the board, where the rudder goes u
through it...

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tenover - 23 Dec 2003 00:46 GMT
Here's a shot of the rudder in the boat....I put the o-ring on th
rudder, seems it'll help with a seal

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Umi_Ryuzuki - 23 Dec 2003 01:39 GMT
Take a wheel collar and solder a brass servo horn onto it  and then us
the set screw to lock it to the rudder post.

If you are going to replace the rudder, find some brass tubing tha
will fit into the hole, or drill out the hole to fit a piece of bras
tubing. Then use a brass rod that fits the tubing I.D. and build you
custom rudder on that.  Then there will be no question that you wil
get a close tolerance fit at the rudder post this way.

You can go a step further and put some bushings in the tube and use
slightly smaller rod for the rudder post. Then you can place som
petroleum jelly, or white lithium grease in the tubing to help seal ou
any water.

Double sticky tape, silicone, or, CA a piece of balsa to the servo
then then CA that to the hull.  Silicone should work fine if there i
not too much torque on the rudder

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Umi_Ryuzuk

Nyow!
/
=^o^
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tenover - 23 Dec 2003 00:46 GMT
Here's a shot of the rudder...Pretty basic.  I will be making my ow
modified ones in the future that are just a single skeg...

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tenover - 23 Dec 2003 00:50 GMT
Here's a picture of what I thought I would do....Somehow mount the serv
here (tape, CA, epoxy...??) and have a small pushrod going straight t
a homemade "horn" somehow attached to the rudder shaft.  Any ideas o
suggestions?  Harry sent me some pics of what he has done on a coupl
of his boats and it's pretty much what I was thinking, but if anyon
else has some different options, please throw them out.  One of m
objectives is to be able to easily replace the rudder when it breaks
and be able to do the same little mod to future rudders (mounting som
sort of horn to the shaft) without too much trouble...

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William A - 23 Dec 2003 01:51 GMT
> *(tape, CA, epoxy...??)*Shoe-Goo.

Personally, I'd stick with the original rudder design.
Looking at it's shape/design, it definitely plays a role in keeping i
'stuck' to the surface.

I also think that the 'brass tube inside another brass tube' (lube
with petroleum jelly) is about your only route.
A horn could be made from a set collar and thin brass sheeting.

What is the rudder made from ?, plastic ?.
Could you fab another from thin brass ?

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William A - 23 Dec 2003 01:53 GMT
Wow, almost word for word.
Umi, are you my long lost, forgotten twin

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tenover - 23 Dec 2003 02:20 GMT
Yeah, the rudder is just plastic, so I guess I could shape a rudder fro
thin brass or aluminum and solder it to a brass post.  Thanks for th
suggestons about using a brass horn, collar, and set screw to attac
it.....Sounds easy enough

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harry m. - 23 Dec 2003 02:40 GMT
I think someone is close by putting brass tubing around shaft and the
another size bigger and so on and then solder the inner pieces togethe
and use heavy grease around shaft and being you're in a warm climate
the thickness of grease won't have a negative effect. Like someon
mentioned to put a collar around brass shaft and put a flat spot s
shaft can only go so far and the n put a collar on the bottom too. Se
screw will go in flat area of which you know. I think this will be th
best system and won't freeze up on you. The wire or what you are goin
to use from servo arm to rudder arm better not be to heavy or stron
cause you need some flex and will keep things from binding

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harry m. - 23 Dec 2003 02:48 GMT
RETIRE

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JoeR - 23 Dec 2003 03:40 GMT
tenover, do you know what brushless setups people are using?  What ar
you going to put in yours?  I think your surfer is a little smalle
then the Kyosho, correct?

Harry- Brushless motors- My point of reference is with RC helicopters.
I know many people using a Mega 16/15/3 in place of a 540 brushed ca
motor in smaller RC helicopters.  They are not that expensive, $80 fo
the motor.  If it will work.  Not sure why it would not.  This Mega ha
a 3000 rpm/volt rating.  I have seen somewhere people mentioning ca
motors with similar rpm/volt ratings for the "dude".  I have
Kontronic 400/28 that is about the same size as the Mega 16/15/3 bu
has a 2800 rpm/volt rating.

Any idea what the rpm/volt of the Chameleon you mention?  How man
cells does it take to get the 33,000 rpm?

Not sure about the interference issue.  My radio is an AM version.
brushless motors do not have near as much problems with generatin
interference as brushed motors in my experience.

I will have to check with Castle Creations on these issues.  Hopefull
one of their controllers will work.  

Its winter here in Michigan so I have some time to figure it all out
Though yesterday and today almost reached 40 with some good wind.
Perhaps I should have given it a try.

Thanks, jo

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harry m. - 23 Dec 2003 07:53 GMT
You know , it sounds like you're giving me **** ! You are mixing apple
and oranges!  Helicopters and boats are two different stories! Boat
are harder on motors than anything else! What do you mean brushless ar
cheaper than; you forget the controller for brushless from castle is i
the range of $150.00 for at least a 80 amp unit. Maybe the $80.00 Meg
is too small. I was only trying to help this gentleman and at first h
did not mention surfer but wanted to know how to make a rudder an
linkage but that was all. Nothing was mentioned other than that. I
sounds like you are trying to belittle a senior citizen and sure sound
like it and like  my post ahead of this said--- RETIRED. I think tha
is enough said and i want no more. I didn't profess to be an expert an
all further messages will be deleted. I have my own fleet and will kee
info i know to myself cause am self taught and know what works and no
works and you go figure you're own like i did!! Good -bye!

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JoeR - 23 Dec 2003 12:38 GMT
Harry- I had no intentions of offending.  Please accept my appologies if
I did.  All I was doing is looking for information.  I know nothing
about boats and am just trying to learn.

You offered information that no one else did so I thank you for that.
I was just trying to probe a little deeper.

As I said my point of reference are helicopters which are known for
being hard on equipment also.  They require full time 100% throttle or
very close to it.  The one thing they have over boats is a easier time
getting cooling (I think anyway).  People have been mounting fans under
the canopy or cutting holes to allow the rotor wash to circulate

I know CC sells a Marine controller that is rated to 80 amps but is 80
amps required when using 6 cells packs?  I was hoping that I could get
away with a smaller one.  As I said I do not know anything about
boats.

I will start a different thread now rather than continue to take up
space with info unrelated to Tenover's original post.

Thanks, Joe

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tenover - 23 Dec 2003 15:38 GMT
No worries Joe-
Since no one has these, I think we should just keep it all togethe
anyway

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JoeR - 23 Dec 2003 19:09 GMT
Thanks Tenover,

Have you seen any of these with brushless motors?  If so, what ar
people running in them?

I contacted CC about a Phoenix.  Shawn said that all but the Marine ES
has problems with the pistol grip radios. I guess they need mor
throttle range then pistol grip radios have.

He said they will "marine"-ize (my term) any of their controllers i
asked.  I guess that means they will dip them in silicone before shrin
wrapping.  Since my surfer came with a pistol grip radio I am out o
luck though.

Evidently the marine version does not need any water cooling though.
Unfortunately the Marine, with appropriate software for a pistol gri
radio, only comes in the 80 amp size and it is $180.  

He did also say that AM radios are no problem

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tenover - 23 Dec 2003 20:00 GMT
I have no idea what kind of BL motors people are running, but I know
read it on one of those links above....Mine came with a pistol grip
but I tore ALL the guts out of mine and am replacing it all with my ow
FM stuff and using a 2-stick radio

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Umi_Ryuzuki - 23 Dec 2003 20:39 GMT
Well if motor cooling is an issue, then a boat would be a very tight an
confined space to place a hot motor.

You would need to add a cooling coil and a water uptake, and output. I
is fairly simple.  The coil can be made out of copper tubing woun
around the motor. uptakes are typically placed behind the propellers
and out put can be anywhere out the side of the hull. It can all b
connected with fuel tubing.

Just some speculation, but they may have that forked rudder, so that i
you are riding a large boat, or jetski wake, or actual surf, then on
of the rudders will stay in the water as you cut the face of the wave

-
Umi_Ryuzuk

Nyow!
/
=^o^
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tenover - 23 Dec 2003 21:46 GMT
That's exactly what everyones doing....cooling coil/input/output, an
their actually installing tiny skegs in the rear that are purel
cosmetic except for the fact that there's little holes in the front o
each one that will take in water and route it through the tubes on eac
side of the hull.....You can kind of get an idea with this picture

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-
tenover - Certified Slopehea
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tenover - 22 Dec 2003 23:48 GMT
Hey Joe....
Man, you're stoked!  Wish I could get my hands on one of the Kyosh
Surfers.  Lots of guys are using brushless motors in them with grea
results, along with a 3300mah NIMH, getting around 20 minute runtime i
the surf.  I have one of the so called "cheap" ones, but I think i
looks waaaay better than any others I've seen, and I've already bee
modifying it so much that I think it will hold it's own.  Here's som
REALLY good links I think you'll enjoy...

'Here's my all around favorite....rcsurf.com' (http://rcsurf.com)

'Here's a good one with lot's of info an
\"how-to's\".......surfrc.com' (http://www.surfrc.com)

'Here's one from Australia that has AWESOME pictures an
videos...You'll be shocked at what these little things can do in th
surf!' (http://www.rcsurfing.net/)

'And here's one dedicated to your Kyosho Surfer Dude....
(http://www.rcsurfers.com.au/home.htm)

And last but not least, here's a picture of my guy, with my custo
painted wetsuit.....He comes just with trunks and no shirt

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tenover - Certified Slopehea
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martin richards - 19 Dec 2003 23:42 GMT
A few drops is par for the course. Another idea for the pushrod exit i
one of these bellows. They are Graupner, so might be available fro
Hobby Lobby.
Presumably you have the rudder outboard

-
martin richards - Useful Idio
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tenover - 31 Dec 2003 19:03 GMT
Hey Joe-
The weather here right now is sunny and 70......Perfect winter weather
huh?  I just got a 60amp Astro ESC that I will use along with a bigge
motor (but not brushless.....yet).  Good luck, and keep me updated o
your progress

-
tenover - Certified Slopehea
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