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Thread: Recomended RPM range explained

  1. #61
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    Quote Originally Posted by fweasel View Post
    What timing are you using with that TP 4060?
    timing is at 2

  2. #62
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    Quote Originally Posted by Prodrvr View Post
    I looked it up. It's good for 8s so I'd go with that.
    its a little close to the motors limit on voltage.
    from what I found the motor has a 29 volt limit.
    tppower40601750kv.jpg

  3. #63
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    Quote Originally Posted by Crash View Post
    timing is at 2
    Assuming this is the 1750kV motor, and a Y wind, why so low on the timing? I run more timing on my Y motors, and low timing on my D wind motors.
    Vac-U-Tug Jr (13mph)

  4. #64
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    Quote Originally Posted by Crash View Post
    its a little close to the motors limit on voltage.
    from what I found the motor has a 29 volt limit.
    tppower40601750kv.jpg
    Yes...8s

  5. #65
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    Quote Originally Posted by fweasel View Post
    Assuming this is the 1750kV motor, and a Y wind, why so low on the timing? I run more timing on my Y motors, and low timing on my D wind motors.
    He corrected...it's the 1650 which is a D wind. Has timing at 2 degrees...should just set it to zero.

  6. #66
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    Quote Originally Posted by Crash View Post
    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.

  7. #67
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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

  8. #68
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    Quote Originally Posted by 785boats View Post
    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.
    thanks for that.

    do you use the Freewheeling setting on or off?

  9. #69
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    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.

  10. #70
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    Quote Originally Posted by 785boats View Post
    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.
    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.

  11. #71
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    4 seconds sounds better! So running 8s with the same prop used less amps at full throttle than 6s?

  12. #72
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    Quote Originally Posted by Prodrvr View Post
    4 seconds sounds better! So running 8s with the same prop used less amps at full throttle than 6s?
    Under load , like full throttle take off it is about same. But your going faster.
    More volts did not rise or lower amps.
    Just put the rpms in better place imo
    I am sticking with 8s for now and see where I am at.

  13. #73
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    How are your motor/esc temps? What's the total run time?

  14. #74
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    I am stopping at 4 minutes to be safe threw this testing.
    Temp is 120 f. Threw out system

  15. #75
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    Very good. This is making me rethink my batteries for the Cheetah build.

  16. #76
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    Quote Originally Posted by Prodrvr View Post
    How are your motor/esc temps? What's the total run time?
    Thisis the best this set up has run.
    Lower over all average amp draw.
    Cool temps 120f
    Extreme power
    70 plus mph
    Run times can be improved with 8s parallel of coarse..

  17. #77
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    Can you go up in prop at all?

  18. #78
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    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.

  19. #79
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    Ok cool

  20. #80
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    All the huge amp draw happens off the line getting on plane. On plane I draw 100 to 200 amps on average

  21. #81
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    Quote Originally Posted by Prodrvr View Post
    4 seconds sounds better! So running 8s with the same prop used less amps at full throttle than 6s?
    No Mate.
    If you read post 67 closely he can't use full throttle. so less amps with the same prop.
    That's why I suggested a smaller prop for 8s to achieve a faster speed than 6s with less current draw.
    Not good to run at partial throttle all the time.

  22. #82
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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 .

  23. #83
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    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

  24. #84
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    Quote Originally Posted by Crash View Post
    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 .
    Those rpm recommendations were most likely suggested to keep warranty claims down. There's a ton of boats out there running close to 50,000 rpm regularly. The people who keep rpm down are the racers. I don't race, so my preference is to go balls to the wall!!

  25. #85
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    Quote Originally Posted by Prodrvr View Post
    Those rpm recommendations were most likely suggested to keep warranty claims down. There's a ton of boats out there running close to 50,000 rpm regularly. The people who keep rpm down are the racers. I don't race, so my preference is to go balls to the wall!!
    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...

  26. #86
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    Quote Originally Posted by tlandauer View Post
    Strange, all these years I thought it was the other way around. Racers who know what they are doing can keep the RMP high or lower depending what situation they are in.
    Been in the pit with some of the best in the world in two Namba SAW events here in So Cal.....
    lol. ill keep rereading this but What?

    you didn't disagree with his statement , just added to it.

  27. #87
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    Quote Originally Posted by Crash View Post
    lol. ill keep rereading this but What?

    you didn't disagree with his statement , just added to it.
    Why should I start another round of argument, it's for people who at least can read.....

    Sent from my XT1650 using Tapatalk
    Too many boats, not enough time...

  28. #88
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    Quote Originally Posted by 785boats View Post
    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

    Quote Originally Posted by Crash View Post
    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 .
    Post No. 2 in this thread had answered and explained very clearly.
    Too many boats, not enough time...

  29. #89
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    Quote Originally Posted by Prodrvr View Post
    Ok cool
    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

  30. #90
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    Quote Originally Posted by Crash View Post
    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
    So amps went up.
    What the heck?
    Smaller prop, I did pull 100%more often and longer pulls.

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