its a little close to the motors limit on voltage.
from what I found the motor has a 29 volt limit.
tppower40601750kv.jpg
Never run anything at its maximum limit.
Bear in mind a fully charged 8s pack at 4.2V/cell is putting out more than 29v for a while.
If you are still running the Swordfish ESC, set the timing to 'Auto' for a couple of runs and compare the data. I've always found that with my Swordfish ESC's, the system runs cooler & more efficiently on the battery. That's just from observation. So some data might be good to see.
See the danger. THEN DO IT ANYWAY!!!
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That was Fun.
I ran it on 8s just now.
The amps are down through out run because I am not going 100% throttle.
The max amp draw is similar to 6s but, with more volts the motor is spinning faster and getting the job done easier and sooner so you don't use full throttle drawing the huge amps.
40k rpm
8s1strun.jpg
I think 8s is where its at for me. the lipos, motor and ESC were warm not hot. doing a timed run as not to over load lipos. starting at 4 minutes...lipos come off warm 100 too120 F
My swordfish ESC's are older than the newer ones with the freewheeling diode.
If you are only using part throttle you had better switch it on.
Part throttle can be very harmful to an ESC. The freewheeling diode should help.
If you can't use full throttle then don't run 8s. An ESC is most efficient at full noise.
Maybe drop the prop size down to allow full throttle if you want to continue running 8s.
You must be on the limit of that setup now so be careful.
Mind you, this is coming from a person that only runs oval laps where the throttle is pinned for the whole race for about 1.5 - 2 minutes.
A different concept to the few second bursts that you guys do.
See the danger. THEN DO IT ANYWAY!!!
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Ty.
That concept I have never heard.
I never run at 100 % throttle for more then 2 to 4 seconds at a time ... Its doing over 70 mph at that point.
I want to go fast but, in short spurts.
And I want all the low end power that comes with my set up.
It runs cool and fast
I hope esc holds up.
4 seconds sounds better! So running 8s with the same prop used less amps at full throttle than 6s?
How are your motor/esc temps? What's the total run time?
I am stopping at 4 minutes to be safe threw this testing.
Temp is 120 f. Threw out system
Very good. This is making me rethink my batteries for the Cheetah build.
Can you go up in prop at all?
Sure.
I have a 55x1.6 that pulls a little more amps but, not 300 continuous by far. It hangs bangs the 334 amp mark like the 52mm does at times.
Ok cool
All the huge amp draw happens off the line getting on plane. On plane I draw 100 to 200 amps on average
See the danger. THEN DO IT ANYWAY!!!
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Back to the start of this threads intention was to explain the reason behind the OSE
recommend rpm range.
Not sure we got to the bottom of that .
Here's a discussion from a few years ago. There are many more if you use the search function.
Pay close attention to the words of a master in post number 12.
https://forums.offshoreelectrics.com...-s-the-problem
See the danger. THEN DO IT ANYWAY!!!
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Strange, all these years I thought it was the other way around. Racers who know what they are doing can keep the RPM higher or lower depending what situation they are in. The suggestion is for sport boater who seek longer run time and constant change on throttle to keep a more realistic RPM in order to obtain a more reliable and fun fulfilling experience.
It is also a guideline for new comers so their initial entry into this hobby are not accompanied by failures.
Congratulations for your approach, not trying to be sarcastic.
Been in the pit with some of the best in the world in two Namba SAW events here in So Cal.....
Too many boats, not enough time...
I went out to the pond this morning I fit it with a X545 stainless steel prop that I got from Doctor props to see how a 8s would like that ran real nice real fast going to check the data but I have to assume its drawing less amps than the 648 I was running yesterday
0916180754c.jpg
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