ML Boatworks RSX380 Outrigger! My first FE wood kit build...

[sammyha]

Would I have overheating issues with the TP 4070 1650kv on 6s? And would a 220 amp Swordfish esc handle that?

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[Raydee]

I wish I could tell you, I haven't run either to know. I would say you will be right around 35k rpm so as long as you don't over prop I think your setup would be fine.

[sammyha]

Here's a setup on 6s with the TP Power 4070, 1650kv...



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[Raydee]

What are you figuring your voltage per cell under load at?

[sammyha]

What are you figuring your voltage per cell under load at?

I don't know how to figure that.

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[jim82]

I have a Tp 4070 1650kv used 2-3 short runs I would sell if interested

[Raydee]

I don't know how to figure that.

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So what are you using to figure out your total RPM? Normally I take the pack voltage under load (I am usually at about 3.5 volts per cell) times 6s= 21 volts x 1650 = 34,650rpm

[sammyha]

Oh, duh me...Using the OSE calculator I can figure theoretical results. I don't know how 6s would do tho. As far as overheating goes.

I think I can relate this to helis. The big 6s birds fly well due to size, but the electronics are being pushed too hard. Go with 12s and no worries.

I think 8s for the SAW running would be best.

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[sammyha]

Those are loaded rpm's from the OSE calculator in my figuring.

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[Raydee]

Because I don't race and I am not restricted to any rules I always say the higher the voltage you can run the better off you will be to keep the amps down. If two 5s packs fit this boat I may end up running 10s in it.

[sammyha]

I have a Tp 4070 1650kv used 2-3 short runs I would sell if interested

Thanks. I'll keep that in mind, but I'm leaning towards an 8s setup.

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[sammyha]

Because I don't race and I am not restricted to any rules I always say the higher the voltage you can run the better off you will be to keep the amps down. If two 5s packs fit this boat I may end up running 10s in it.

Ok. I'm getting it now. That's not the first time I've heard that. Low amps, high voltage.

I'm going with an 8s system.

The OSE calculator gives the numbers which is a good start. Then there's the real world. I need 8s to push this rigger over 90mph I'm guessing, without overheating issues...

Probably even 85mph would be expecting too much from a 6s system.

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[sammyha]

Haha! I kind of muddied up my own thread. But, this does show the newcomers struggle with electronics decisions I suppose...

Ok. So a TP Power 4060, 1350kv, 4y motor. On 8s lipos. With a Swordfish X+ 200 amp esc. And an ABC 2216-10-50 CLL prop.

That should give me a 102mph potential top end with a 3.52 total pitch prop. Very reasonable.

And I could maiden the boat on 6s, same prop at a sensible 76mph top end...



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[sammyha]

After curing for a day, I pulled the weights and tape off. Success! The top seams are tight...


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[sammyha]

Something I noticed with epoxy. It definitely strengthens(cures) more overnight, to the point where it maintains shape as far as flatness goes.

Yesterday I picked it up after the epoxy had set, to give it a once over. It had a slight twist. So, very important to leave it weighted for 24 hours.

Slight twist is gone now, very straight and flat. It feels more rigid now too.

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