eighty something!?!

[treystoys]

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Hey guys, the plan is to get this guy running again. I built this probably 12-13 years ago as an n2 oval boat. Back in the day with a Hacker b50 8s and 6 3300's I gps'd it in the 40's, low to high prop dependent. I never really intended it to be a straightline boat, but with todays tech (batteries really) and a hotter motor I am looking to break 80 on 2s.

Questions would be battery size (capacity) for a 2s saw boat? and speed control specs for a juiced up 2 cell boat?

For information purposes I had a few passes over 50 on 6 sub Cs back when Dick Crowe and Donnie Wollard were setting the N2 hydro records at the Namba SAWs (in 2001 I think). I just couldn't swing the coin to hit the west coast. Anyhow, just pointing out that I have gone fast back in the day on limited voltage but need some updated thinking on todays cell limited straightline boats.

I think 80 something is easy enough if the boat will stay on the water, if not I'll build one more suited to going straight.

Thanks in advance!

Trey

[Fluid]

We remember you Trey, but what boat are you talking about? Will you be coming out to the LA SAWs in November? That's the best place to learn about modern 2S go-fast tech.



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[treystoys]

Hey Jay how've you been!? Lol that is a good question about which boat!! I posted about 5 pics along with the original post, but I see or rather don't see them now. I am responding from my phone, so I'm wondering if that's what the issue is. I'll check on the laptop later in to see if it's phone related.

As far as the saws go Jay I doubt it, I would love too, but work and children stop that at the moment. Good to see you're still knee deep in this stuff! Ive always been drawn to the lower powered stuff more than anything, kinda more roots f/e too me, small boat, 05 motor and 6 cells, if you went 20 mph for 90 seconds and didn't melt anything you were doing good lol Hard to fathom that same class of boat is over 100mph in a straight line. Anyhow will talk soon and see what happened to my pictures. It was just my small self designed n/o hull from back then.

Talk to you soon

Trey

[treystoys]

Ok so 4 times I edited and previewed the post and the pics are there, save and they are gone?

Trey

[RaceMechaniX]

Hello Trey and welcome back.

It is possible although a huge challenge but that is a great target to hit. 80MPH has been done with a N2 size boat although on 4S1P. The same boat went 76mph with a N2 set-up on 2S2P. A competitive N2 mono will likely need a full 10,000mAh and as many amps as the controller can muster. The controller is the weak link here so finding a good one is the key.

Tyler

[treystoys]

Pics up finally!! lol

Thanks Tyler...the boat in question is a rigger actually. Although my first love is actually mono's, I think 80 with a 2s rigger would be easier to obtain...baby steps lol

But getting back to the comment about the "N2 needing 10,000 mah" this is what I'm looking for and need schooling on. The only thing I know about Lipos at the moment is from my cars. I walked away from the boats when Lipo's came around. With a family and multiple children I knew there was no way for me to afford to be competitive and/or travel and race which was what I was into. Now that the Lipo's have become more available and more reasonably priced I'd like to pick up where I left off lol Well, atleast explore a bit. I guess the thing that has me stumped about the batteries is the huge range of capacity available and what I'd need for a set up like I'm considering. My old school thought is telling me smaller battery with less mah for weight consideration but what I'm getting is that to really make the use of what the battery has to offer I'll need more capacity? I guess even though I've used Lipo's for a few years now in the cars (strictly roar approved 2s hard case packs) I'm a newb to boat use, especially going really fast with them and how the different configurations effect output.

I'm all ears and looking forward to thoughts suggestions and comments about the boat above too.

Thanks

Trey

[RaceMechaniX]

Ah, without the pics loading I assumed it was a mono. 80mph with a N2 rigger is very achievable. With the new cells you could run 1P for a rigger. The 26" length is still one of the challenges packaging all the equipment in. You will want a motor around 6000-7000kV. Typically something around a 1509 or 1512 Neu size motor will get you there. Some of the higher output car motors with the correct kv would also work. The controller is still the biggest challenge. A car esc will not cut it. The Turnigy T180 works well and is reasonable compact. Otherwise the newer Castle ICE 200 lite aircraft controllers work too.

TG

[treystoys]

Hey guys...so I put the boat back to a ready to run state today. Its just from what I had around, so don't freak...

-Boat is my own designed N2 rigger from back in the day...21" hull length about 16" from the rear of the sponsons to the trailing edge of the prop (just giving that for footprint purposes case anyone wanted measurements) its been right around 48mph in the past on 6 sub C's and a Hacker b50 8s never pushed it beyond that as it was an oval set up

-Hardware is mostly Fullers older stuff with one of his thinned out wedge water pick up rudders. The strut is an 1/8" unit with a .125 flex shaft Octura cupler on the other end. Since I'm just gonna be doing some straightline stuff I removed the turn fin. Prop is a v935

-Electronics are again just what I had. Chili-Pepper b50 6s with ceramic bearings (never been used, bought it from Donnie when they were playing around with the idea of selling them) Hextronik 120amp esc, Racers edge 2s shorty ROAR packs 3800mah. Using my Futaba 3tpk and receiver and a mini sized heavy duty bb servo from Airtronics

So I guess my main question at this point is should I even bother running it with the Hextronik esc or wait till I get something newer and closer to 200amps? If I do run it as is it'll just be an out and back blast to see how it behaves then check temps. But if you guys think I'm gonna toast it off the bat I'll wait till I have the new esc on hand. Like I said earlier 80mph is the goal, I think the motor/boat/prop will get me in the area...speedcontrol?? no clue!?

let me have it!

Thanks guys

Trey

[Fluid]

I don't know what the Kv of the 6S motor is, and what is the "C" rating on the packs? That would help us to decide. A 120 amp controller isn't much at all today, especially for 2S where the power comes largely from amps rather than volts. That is a tiny boat by today's standards, most riggers today push the length limit if 27". And the 1/8" cable won't hold much power either. But I'd try it after you tell us the Kv. 2S is a lot more powerful than 6 round cells....



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[treystoys]

Ugh...lol Jay I responded to you on here minutes after you replied via iphone...and had wondered why I never saw a response notice pop up via email...well I see my response is not here

Oh well, the motor is Hacker B50 short can based, so even though I don't have exact numbers, Don and Donnies idea behind these was to better the then current Hacker/Hopf motors, so I'd say its right in the 6000+kv area with a bit more efficiency than Fiago motors. The batteries are labeled 75c constant 4000mah.

My thoughts around the driveline are that if it held up with a heavy 6 cell nihm pack and pushed the boat to upper 40s it may live in a lighter set up with more power...maybe lol

Trey