Ripmax Magic Vee - RC Groups
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Jan 30, 2010, 10:55 AM

Ripmax Magic Vee

Hi there. I was in the model shop today buying repair stuff for my bf109 that piled in today! I spotted high on the top shelf this little racing vee!

when i got back i found the only video online of it and thought id like 1. turns out i had the wrong size prop for the plane so another trip later......... i brought 1

looks nippy on its 180 but was thinking lipo/brushless bullit!
any1 have any idea on ideal motor/esc and prop? im new to the boat thing!
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Jan 30, 2010, 11:40 AM
Boaters are nice people.
Hi Chris,

Be aware of the fact, that small hulls are easily overpowered; on the video the hull already starts to porpoise with the stock motor, with more power this will get worse up to undrivable, unless you alter the entire set-up to match the power installed.

Regards, Jan.
Jan 30, 2010, 12:26 PM
right ok, points noted. wont be going crazy with this then. maybe a a nice lipo setup to increase the speed a little and the run times. this thing comes with a cheapo plastic transmitter so thats def going!
the stock battery is 7.2v 260mah
Jan 30, 2010, 03:23 PM
are there any better 180 brushed motors out there?
Jan 30, 2010, 03:32 PM
nick 30
nick30head's Avatar
not really, although you could try graupner, its a german company, as your english, try they have some, how about trying the equivilent size lipo to the nimh batt you have now
Jan 30, 2010, 03:38 PM
surely something like this
Can a 180 heli motor be much different?
and yeah i was going to look for a little lipo similar to this.

7.4V 500mah ? (.2v bigger cant hurt can it?) the stock esc is 5A
Jan 30, 2010, 04:49 PM
Boaters are nice people.
Hi Chris,

The heli motor has replaceable brushes, that's a good thing as far as lifespan is concerned.
But, most likely it will rev way too high for a boat in direct drive, as most heli's work with gears on both the main and rear blades.

Sadly that info isn't available in the link.

If it has between 25.000 and 33.000 rpm under load, it would be an option, much more will just result in foam, not speed...

Regards, Jan.
Jan 30, 2010, 06:41 PM
iv looked all over the place for the rpm of this motor no luck.
any ideas where i can find props this small too? smallest iv seen are like 35mm
Jan 30, 2010, 10:46 PM
I feel the need for speed!
scorpion1's Avatar
Small beryllium props:

27mm -

27mm -

30mm -
Last edited by scorpion1; Jan 30, 2010 at 10:52 PM. Reason: Add links
Jan 31, 2010, 04:39 AM
Boaters are nice people.
Hi Chris,

This is the smallest Graupner two blade:

And this the smallest three blade from Graupner:

But, you don't want to go the high revs, small/tiny prop way, the efficiency of the small props is on the edge, along with the (lack of) efficiency of those small motors.
As an example:
This motor converts only 55% of the electric energy you put in, into motion, the rest is lost in heat and friction...

If it physically fits, one of the brushless motors, suggested by Scorpion would seem a better upgrade to me.
Keep in mind you'll need to watercool the motor 'properly', as the stock solution is rediculously inefficient for a brushless motor.

If the motor you select, doesn't come with a watercooling fitted, like this one (which, if it fits, will be major overkill):
you'll need something like this:

Regards, Jan.
Jan 31, 2010, 08:37 AM
i got hold of a cheap xtreme se 180 motor. going to see what that does first.
this little boat does have water cooling but it looks like a poor attempt.
after the motor upgrade il see how it does, then il get a 7.4v lipo
am i right in thinking mah will give me better run times? so say a 500mah pack will last longer than my 260mah pack. it wont add speed as thats only voltage.
Jan 31, 2010, 08:56 AM
Boaters are nice people.
Hi Chris,

Yes, you are correct.

Keep us posted on your 'speeding up attempts'.

Regards, Jan.
Jan 31, 2010, 11:00 AM
Cheers. yeah i will do
I took it to a small bit of stream near me today.

Here is what i think:

1. Mine is not 20kph.
2. My motor shaft isnt the straightest thing around.
3. The layout with the Nicad makes the boat sit lopsided!
4. because of the above it turns sharper to the left.
5. After 2mins i had quite a bit of water onboard.
6. My servo rod has a bit of backlash in 1 direction.

What i hope will happen.

1. find a straight shaft.
2 the lipo will be lighter and thinner so i can balance the boat.
3. lay a thin layer of silicone at suspect leaks.
4. bend the control rod better to eliminate backlash.
5. find a better prop.
6. fit the xtreme se180 motor.

The stream was pretty tight and after 3 seconds i had to rescue the boat.

Is there any rules on balancing a boat? should i place more upfront it it porpoises?
would a long motor shaft out the back help in any way apart from larger prop diameter.

another thing. those little fins at the back.......
what are the for and why and when would you adjust them??

Think it would make a nice Monster Energy/DC boat!

Cheers Chris
Jan 31, 2010, 12:45 PM
nick 30
nick30head's Avatar
for self righting you want the battery as close to the prop shaft as you can, keep the battery about in the middle of the boat, the fins are there to aid stability when turning, a long prop shaft will make the boat prop walk, i would try to make the shaft shorter at the motor to bring the prop closer to the transom or find a strut small enough for the shaft

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