Cactus.

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brought this the other day, great motor mount idea.
anyone know the kit?
also which surface pearcing prop would be best on a stock 540 motor 6-8 cells?
Thanks

Doubledog

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Looks very similar to one of the MHZ hulls.

Turbosun-RCU

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That is a Hopf Monte Carlo Evo I epoxy-glass hull
7 subC cells and a K series 37.5mm prop is a good starting point.
www.XtremeDoc.com will be up soon where these boats are available as sets. Hopf is exclusively imported and distributed by XtremeDoc.

Cactus.

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GREAT INFO! thanks, let the google search on that boat begine
was going to get a Tamiya mod motor for it last night, old motor but it has an internal fan and also small cooling slots that wouldn't interfere with a direct contact water jacket
but the motor is an old design even tho this one is like new.

pompebled

This type of motormount has become more or less the standard solution in the European racing scene.
No troublesome alingning of motor and shaft, easy motorchange between heats.

Rather expensive though, since I have acces to a lathe, I make them myself, customized for all motorsizes, no fiddling with adaptors anymore!

Greetz, Jan.

Cactus.

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i found myself wondering about a brushless motor today ummmmmmm
anyway, first job is to find a 37.5mm cheapo dogdrive prop to have some fun with. all i have around here is normal shaft ones

pompebled

Just change the shaft for one with M4 (or cut some more M4 thread on the existing one) and you can use the Graupner K-serie Hydroprops.

Jan.

Cactus.

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ah yes of course.. smart thinking.. boats having some small dings filled right now then a respray

Cactus.

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it's been resprayed, this is a photoshop mock up of the graphics.

Cactus.

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it's been a hell of a long time, and with a stock motor/ 8 cells this boat never did do well, kept flipping one way wouldn't turn the other.

got a spare brushless motor handy and have just fitted it.

an Align 400lf, normaly swings a 5x5 APC airfraft prop, any ideas what it needs in water?
tried my smallest prop and it sprayed the walls with some motor warming when held right under and not allowed to rev as it would in a lake.

Cactus.

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just took it out.

went much faster than it did on it's old 540 stock motor and 8 cells with the bigger prop!!

battery was fairly warm but ok, close to it's limits tho.
motor was hot, but it doesn't have a cooling jacket or even a flow of air yet.
speedo had split it's shrink tubing! it's 40A rated and that motor draws 25A at the most, the battery can only give that.

speedo is always getting warm, don't turst that tornado at all, 40A my harris.

got at least 10 mins run time and pretty happy.
i'll see if i can get another of the small props i have thats missing it's tip, that should lower the power just enough and i know it fits.


now just gotta make it run ok.

currently it has a rudder mounted to the starboard of the prop.
when turning left it comes out of the water and acts like a wing turning the boat over.
it's ok on large right hand turns.

would making a twin rudder that sits either side of the prop further back help?
it's a deep V after all, should turn ok.

pompebled

Good to see you're up and running!

The offset rudder is OK, for right hand turns, turning left is a bit tricky, but possible.

What you need is a turnfin (or two) to prevent the boat from spinning out in turns.

Regards, Jan.

Cactus.

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and the turn fin is located the same side as the rudder with a little twist to make it run straight?

at least thats how it looks on other pics.


i'd be happy it it just went like any other v hull.

central rudder right out the back maybe? add a fin either side on the transom?


as i said i did get it running soon after my last post, but the motor couldn't take it and i got bored just doing right circuits and trying to stop it flipping over.