Fantasm CF 41

[White Trash]

Hello All,
My name is Tony C and I'm new to fast electric rc boats. I'm an old Nitro Outboard RC guy.
I just recieved a 41" inch carbon Fantasm for my B day from my loving wife. I don't know where to start parts wise and electric wise.
I want to build the thing for fast straight line recreational fun. Knowing that my avatar is my current addiction, I have a serious need for speed.
I want a twin drive, max speed set up off the trailer. I can't justify underpowering or undercelling a boat when you have a throttle finger to control speed. I will support the hosted shop and or friendly recommendations.
Can you point me in the right direction? Please.

[twissted]

12s lipos and big low kv motors, twin 50mm props and 400 Amp esc's with a 150mm rudder should do the trick.
Keith knows these boats and builds them fast. Look at his work. He doesn't like me posting other peoples work so you will need to find his work here or on fightercatracingforums. This boat your wife bought is a nice hull and will be a lot of fun for you.

[KartRacer]

Hi White Trash
You have come to the right place. I am also new to the forum and RC Boats. I am in the early stages of building a Delta Force Pirate 35" and the people on this forum will steer you in the right direction. OSE does a great job also and there are no worries about whether they will deliver the goods. Gather the info from everyone and Steve at OSE along with other vendors on the forum will deliver high quality product and service. Good luck with the build.

[twissted]

STUPID HORSE POWER! I like it. The stingers are important and the better they mount the better. The best I have found mount in two places.

The prop you are looking at is a X447 octura that is modified by me. You will need one that turns left and one that turns right.

[RaceMechaniX]

Tony,

How much do you know about electrics? We can suggest wild set-ups, but these are very dangerous if not fully understood. Do you have a speed in mind you want to run? 80's, 90's or 100+.

A twin can be built reasonably to go pretty fast with the right equipment and knowledge.

If you are around central or Southern CA I would suggest coming out to the Legg Lake SAW's where several single and twin motored cats will be putting down some fast times.

Tyler

[White Trash]

You guys are awesome. And I don't know poop about electrics. Give me methanol or C25 and I am a guru. I appreciate all the help and look forward to a fun build . I would like to see 90's plus. I feel it's realistic and with some finesse on the trigger finger it can be pretty reliable.

[dana]

What is your budget? ALOT depends on how much money you are willing to spend. Twin = double the money of a single.

[keithbradley]

You guys are awesome. And I don't know poop about electrics. Give me methanol or C25 and I am a guru. I appreciate all the help and look forward to a fun build . I would like to see 90's plus. I feel it's realistic and with some finesse on the trigger finger it can be pretty reliable.

It doesn't really work that way. Building something that goes 90+ mph, and then only using half throttle won't make it reliable like you would think it would. Your best bet would be to build something that has the potential to go fast at high RPM with aggressive props, then run it on a lower voltage with milder props for sport use. The problem with this is that it's hard to run 65mph when you've already ran 90+.

[srislash]

The problem with this is that it's hard to run 65mph when you've already ran 90+.

Very hard indeed.

[Make-a-Wake]

Twin Leopard 4092 3.5D's on 6s each. Swordfish 200 amp ESC's and Octura x450/3 props L + R

http://www.offshoreelectrics.com/pro...o-4092&cat=148

This will put a big smile on your face.............................

[White Trash]

Your best bet would be to build something that has the potential to go fast at high RPM with aggressive props, then run it on a lower voltage with milder props for sport use. The problem with this is that it's hard to run 65mph when you've already ran 90+.

I completely get it. That's how I ended up driving a 2,000 horsepower ironing board. But there is a time and place to run it to it's potential, and that time is not all the time. Otherwise I'd be dead! I appreciate what you're saying, and I get the philosophy. Engineer the thing to handle the entire kitchen if you want to throw it at it, but keep the kithchen sink out most of the time for play. Kinda the same as running a larger blower pulley for most occasions, and keeping the small one for those special moments.
so this being said, having the resources to build a fast twin, and only knowing enough about electrics to be potentially dangerous:
I'm gathering twin large, low kv motors, 400 amp esc's, 12 cell ability on say 8 most of the time, 4 sets of props depending upon conditions, and a big water pick up rudder.
I was thinking I could get by with dual .187 drives, and I would like full adjustablity of my drive angles. Am I on track? Any recommendations hardware wise. I really like the looks of those stingers Twissted. they look solid. Brand and make? Thanks again.

[RaceMechaniX]

Tony,

I would start out with a twin 6S system for the following reasons:
-There are several good 6S twin combinations that are known to work reliably
-You can get away with a single 6S pack per side
-If you have a twin charger you can charge both packs at once.

If you go 8S or higher you are more than likely looking at 4 batteries in total which also means two chargers assuming you want to charge everything at once. For example two 4S packs in series to produce a single 8S1P pack per side. You also need to make sure you can fit four batteries in there.

For hardware: Look for a stinger that has a transom mount and an overhang mount. The transom only mounts tend to bend in crashes. A single rudder with twin pick-ups is advised unless you want to use flush sponson water pick-ups. .187" cable should work fine, use with teflon lined stuffing tubes running into the stingers.

I would suggest the following power combo:

Castle 1717's
Castle Ice 240 ESC's
6S 45C or better 5000mAh pack per side
Counter rotating props like Octura X450's

That is a 70 mph set-up with reasonable amp draw. Prop up to go faster.

Tyler

[White Trash]

Tyler,
I really appreciate your advise. I think I will go with a dual pickup rudder simply because the rudder's always in the water, and the boats not. To me, form is function. With your power combo, the right props, and the right set up combination, are the speeds I'm looking for attainable? In short spurts.

[properchopper]

Tony,

Welcome aboard [ The more Tonys, the better ]

There's several SoCal guys (Tyler is one ) that cavort in the realm that you're aspiring to and are always willing to share their knowledge.

One thing you should know ( and I am in NO WAY trying to be discouraging, I swear) is that in the quest for speeds you're looking for, there's some charming moments that accompanying such an endeavor :

http://www.youtube.com/watch?v=42vpI3yu3Cw

http://www.youtube.com/watch?v=z5Rsqt7Vo-s

http://www.youtube.com/watch?v=H4nkk_AWdfI

Tyler at work :

http://www.youtube.com/watch?v=giTKdP20mI8

http://www.youtube.com/watch?v=oOODO4aEeP8

Do come to the NAMBA straightline time trials (SAWS) Nov. 2,3,4 at Legg Lake in South ElMonte. Fun, Fun !!

Tony H.
Pres, SoCal Fast Electrics RC Raceboat Club
[email protected]

[RaceMechaniX]

Tony,

70's and maybe low 80's with the right props are achievable in short bursts with that set-up. 90's will probably require more motor or very careful prop and set-up. Regardless, the upper speeds will take a lot of work where as the lower speeds are pretty obtainable even with the set-up a little off.

Tyler