Outboard pursuit

[Outboard]

Hey guys/girls

I have started building a FE O.S powered Pursuit boat.
You can imagine i will be left with quite a bit of space inside the hull.

What is everyone thoughts on mounting 2 battery packs down the centre of the hull instead of side by side/ conventional way?

I thought better centre of gravity= better handling and less chance of flips etc

thanks
144087

[boredom.is.me]

I think mounting them as low as possible should take priority over how wide the weight is disperced. From a physics standpoint, wider mounting should be more resistant to change, in this case rocking or chine walk, but tgat may potentially hurt maneuverability. Being realistic, the numbers are too small to actually matter.

[Fluid]

Lots of good information:

http://www.modelpowerboat.com/content.php?118-rc-boat-hull-attitude


.

[Outboard]

Just thought about having them together standing up another option?

[Beaux]

If it does'nt throw your cog off down the center is better.

[ray schrauwen]

How did you decide to mount the OB? Is the prop center line above the keel or????

I have the parts to do this, I just want to make sure I mount it in the right place the first time.

[Outboard]

The prop shaft is in centre of the keel, with adjustment either way. Ill take come picture if you like.

[ray schrauwen]

I understand. The pictures you already posted show it pretty well. Just needed to be sure.

[Outboard]

I am just at the point of starting to mount down the esc, battery trays and routing the wires as neatly as possble
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[Beaux]

Very nice.

[Outboard]

Very nice.

Thanks Beaux, its my first boat build

I need some help deciding on how to go about mounting the batteries. Should i place them flat away from each other like this
144325

Or should i have them sitting against each other standing upright, this way will only require one battery mount and looks neater. I'm more worried how the hull will respond to either setup? Any help would be greatly appreciated
144326

[Beaux]

Standing upright should be fine, and it does look neater.

[Beaux]

Just be sure you have room to move them as far back as possible to adjust your center of gravity, should be approx. 30 %.

[Outboard]

Just be sure you have room to move them as far back as possible to adjust your center of gravity, should be approx. 30 %.

The way they are positioned now is at 30, those two marks in the last photo on the masking tape indicate 30% and 27%.
I'll bite the bullet and mount them this way, I just hope the hull doesn't want to roll over

[Beaux]

What size motor are you running. That boat looks good with an outboard.That's a good esc I'm running one in my DF Pirate.

[ls1fst98]

down the center works great for my pursuit. mines conventional, with the motor to the very back, batteries on a tray down the center.

[Outboard]

What size motor are you running. That boat looks good with an outboard.That's a good esc I'm running one in my DF Pirate.

Running a 3659 1900kv on 6s

[Outboard]

My batteries seem upfront but that is to counter balance the outboard hanging off the back

[Beaux]

She ought to fly.

[Outboard]

I am a little worried that the leads from the esc to the motor may be too long. I had to make them this long to rout the wires neatly and away from the steering/servo. what do you guys think??
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Also these terminals come on the motor from factory, will they be good to use or should i use 5.5 connectors??
144417

[Outboard]

She ought to fly.

I hope so, depending the prop, not sure what will work well. I have a 4414/3 for it. Any suggestions greatly appreciated

[boilo56]

I would try 4014/3 first, just to be on the safe side. But My boat does not run an outboard motor, so i might be wrong.

Regards, André.

[Outboard]

I would try 4014/3 first, just to be on the safe side. But My boat does not run an outboard motor, so i might be wrong.

Regards, André.

What motor and esc you running?

[Beaux]

The connectors look a little lite if you have 5.5's I would change them. 6s is pretty hot. The prop you have should be ok.
If your running a hobbywing 180 6s will smoke it'

[Outboard]

The connectors look a little lite if you have 5.5's I would change them. 6s is pretty hot. The prop you have should be ok.
If your running a hobbywing 180 6s will smoke it'

How will I smoke the Hobbywing 180 ESC? Because of the connectors or the prop and motor combo?

[Beaux]

6s is 22+ volts and many mha's if you run 40mm or less prop it may last awhile, is your motor rated for such voltage . I have a similar size f1 hull with a 3650 leo 2200kv and 5s is way too crazy.

[Beaux]

Go to the electronic talk and pull up esc's there you can get a lot of info on our particular esc along with cooling mods. check it out.

[Outboard]

6s is 22+ volts and many mha's if you run 40mm or less prop it may last awhile, is your motor rated for such voltage . I have a similar size f1 hull with a 3650 leo 2200kv and 5s is way too crazy.

You are getting me worried, I run this same motor with a 120a seaking esc with a 2 blade 42mm prop 1.4 pitch with no dramas at all.
144428

[Beaux]

Just run it and chck the temps being its such a small boat you may have no problems, just check your temps.I've run mine on 5s in my mean machine approx. 4 mins. and it was pretty warm.
your specs say its ok so run it thats all I was worried about 6s is almost 40,000 rpm, it ought to fly , have fun is the main thing.

[Outboard]

Just an update, pretty much everything is mounted in position, i also did a float test to check for leaks etc. No leaks and floats nicely.
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[Beaux]

Cool, that is a nice lookin boat.

[Outboard]

Just an update, I replaced the standard Teflon liner with a 3/16 brass tube and slowly bent it to shape.
The flex shaft is greased and installed but i do find some resistance, the shaft is snug in the brass tubing. will it "break in" and loosen up you think?
144693

[Outboard]

After 4 months its finally ready for testing, I think its come up pretty good considering its my first build.
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[Beaux]

Yes, you did a fine job. It should be a blast.

[Outboard]

Yes, you did a fine job. It should be a blast.

Thanks, should hoot along nicely. not bad for a first build