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What about a Novak Ballistic 550 motor @ 7.5 turns (3000kv) with a Xerun 150A esc on 4S for straightaway runs? Does this fit into everybody's "too much power" theory? It's sensored btw.
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Yea you shouldn't that's right, but in boating we use unloaded rpms as a gage. 25k-30 is typically a good avg for sport boating and racing. When you get into the upper 30s and 40s unloaded (loaded the drop isn't as much as you think), the amp spikes are to high which leads to pre-mature esc failure, the bearings in the motor start to go wear faster and the strut bushing and flexcables wears faster. You can try if you want, I'm sure you'll have fun (until it blows).
This isn't anything new. running boats at those rpms always ends in failure its just a matter when. Ask a SAW racer how many motors and esc's they've fried. That's why saw racing isn't for the faint of heart and isn't for the boater w/ a small wallet. I bet any money the number of people that have fried something is far greater then the number who are having success w/ it, you just won't read about because they don't want to hear all the "we told you so's). I just say whoevers doing please get video because I enjoy watching esc's smoking from terrible setups. Guys trying to run 5 minutes on this setups are just fooling themselves, then other people read it and it spirals out of control.
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Scroll through the names on this thread, seasoned veteren racers w/ many YEARS under their belt some are boating legends and they're all agreeing its bad, why do you think that is? Why attempt to re-invent the wheel.Comment
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Ok thanks for the input. I feel like I should have mentioned first I designed all my running hardware with the higher rpms in mind, including a custom machined prop (I'm a mechanical engineer) though. I was purely wondering if store-bought electronics like what I mentioned could handle it or should I design my own (you mentioned amp spikes?). There doesn't seem to be very much model motor design data on the internet apart from what you guys say here in the forums, so any help I can get is useful.Comment
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Eagletree is your friend or the ICE series of esc's. Data-logging rocks. Numbers don't lie.
The higher the rpm you typically need to run a smaller prop just to keep the amps in check, to small a prop mixed with high rpms then the hull may cavatate, too big a prop and poof goes the esc. Unless your out to break records, high rpms is just asking for problems.
* twins are a different story*
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I am also sick of the 6s stuff. I think 7s is where it's at.
You guys think the bj29 is intended to run on 6s? It must have a tiny prop if so. 50mph is not at all impressive for 1800kv on 6s. Maybe the ESC is just 6s "capable"?Comment
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6s is the way to go with the correct motor. When comparing 4s and 6s, running in the same boat, and wanting to attain the same speed, the Motors run cooler, esc's run cooler, batteries run cooler. What am i missing?Steven Vaccaro
Where Racing on a Budget is a Reality!Comment
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6s requires a 1250 to 1400kv motor and 6s2p for good life.Comment
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I think the PB1500 would have been the better choice for going with 6s. 1800 is a 5s setup max in my book.
Agreed, problem is folks aren't thinking like that, at all.
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Well said. While, as I've said before, a well-balanced 6S setup has distinct advantages in certain instances, the main thrust of much of this discussion has to do with providing well-meaning caution to those that simply "wannagofaster" by bumping up the voltage from, say 4S, to 6S with motors that will have trouble at higher rpm's.
Here's my main concern : I've observed several comments from those that use the term "SAW setup" as a means of simply wanting to bump up their top speed (and there's nothing wrong with doing that) by duplicating a SAW RACER"S setup and then make pass after pass just for the pure thrill of it (again, nothing wrong with that) until the inevitable happens. As Mr. Diesel correctly pointed out, SAW RACING is a highly specialized and risky endevour. While data logging is becoming a must for a SAW racer, much of the procedure often involves pushing the equipment to the breaking point, then backing down a notch to get two back-to-back passes in to get a record. Kinda' like striking a match to see if it lights. And , here's the biggie : Most SAW runs are done in SECONDS. A run up to the lights at full throttle and 330 feet through the lights, then off throttle. If near or above the record, a second (or in rare cases a third and forth) run is done. It's over in seconds. My P-Ltd Offshore record of 67.771 mph was done in 3.32 seconds. I'd never run that setup for "fun". In fact most SAW racers don't bother with watercooling the motors ; watercooling takes time for temperatures to equilibrate and the SAW run is over before this takes place. And just for the record, for the enlightenment of those that are stuck on the concept that the only way to gofaster is to jump the cell count, consider Mr. Buass's TWO CELL (N-2) Hydro record of 103.3 mph on 2S !!
Bottom line : While bumping the cell count to gofaster is in the short run (yes I purposely chose that term) one way to get there, you miss the learning experience associated with practicing the essential lessons inherent in the fine Oriental Art of "Too-Ning". Just keep in mind Mr. Dylan's words : "There's no success like failure, but failure's no success at all."
Happy Days
TonyLast edited by properchopper; 06-12-2012, 11:59 AM.2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /MonoComment
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I've actually been contemplating putting 6S in a Miss G and seeing if I could survive for Q-Offshore at the Nats...
But then, I'm NUTS!!
Darin E. Jordan - Renton, WA
"Self-proclaimed skill-less leader in the hobby."Comment
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2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /MonoComment
Needum big wings like Eagle on Geico 
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