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Thread: Recomended RPM range explained

  1. #31

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    Quote Originally Posted by TRUCKPULL View Post
    John

    It looks like he has ordered a Octura 2352
    52mm - Dia
    2.3 pitch ratio = 120mm of pitch

    a Octura 452 is only 62mm of pitch

    He is now drawing 275Amp with a 452
    2350 Prop - he would need 140 C batteries and a 500Amp ESC. and watch out for the

    Larry
    Wow! That's a lot of prop for the setup.

  2. #32

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    Quote Originally Posted by TRUCKPULL View Post
    John

    It looks like he has ordered a Octura 2352
    52mm - Dia
    2.3 pitch ratio = 120mm of pitch

    a Octura 452 is only 62mm of pitch

    He is now drawing 275Amp with a 452
    2350 Prop - he would need 140 C batteries and a 500Amp ESC. and watch out for the

    Larry
    not much of this statement is accurate but, ok.

    I am smart enough not to mount that huge prop and hit the throttle full boogie. but, I could mount it up and get it up on plane and see what it does. I said, it just for fun not trying to go 94mph

    I got readings as low as 49 amps at full throttle with my set up with a 52mm X 1.6" prop two trips out. The water was loose not flat and the boat was running real dry and fast 68mph. awesome day.
    last time out with same set up on flat water the boat would not come loose from the waters grip and it was drawing 275 amps for brief milla seconds on the data log and going slow 58pmh

  3. #33

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    Quote Originally Posted by Crash View Post
    not much of this statement is accurate but, ok.

    I am smart enough not to mount that huge prop and hit the throttle full boogie. but, I could mount it up and get it up on plane and see what it does. I said, it just for fun not trying to go 94mph

    I got readings as low as 49 amps at full throttle with my set up with a 52mm X 1.6" prop two trips out. The water was loose not flat and the boat was running real dry and fast 68mph. awesome day.
    last time out with same set up on flat water the boat would not come loose from the waters grip and it was drawing 275 amps for brief milla seconds on the data log and going slow 58pmh
    Let us know how it turns out.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  4. #34

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    49A wide open...esc data is inaccurate. I would use a different tool for data acquisition.

  5. #35

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    Mono hull : 30000 RPM
    Catamaran : 35000 RPM

    Right ?

  6. #36

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    Quote Originally Posted by Prodrvr View Post
    49A wide open...esc data is inaccurate. I would use a different tool for data acquisition.
    Will do.
    flexshaftshredded2018.jpg
    this is a data log from the run I mentioned. It was running killer until the flex shaft failed and you can see the data logger shows when that happen. temps shot up, amps shot up, pulled over 7000 watts 348 amps , 237 F …………….
    Last edited by Crash; 09-13-2018 at 08:44 PM.

  7. Default

    I have run my Twin HPR 06 with success ....with SSS 4082 2200KV at 7S with X+ 200amp and prop 2014-17-45 ...Every thing was pretty much cold after the run

    And the same boat with the same motors WITH Flycolor 150amp (OSE Raider) at 6S HV and prop X457 cutdown to 53mm...Esc's was almost 55'Celcius temerature...

    I also run my 33.5' delta with Neu 1521 1900kv at 7S with Swordfish Pro+ 200amp and prop 1814-17-45....Results...89.5 mph..
    Below is the Delta run at 7S
    Untitled_2018_9_14_1.jpg

  8. #38

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    Quote Originally Posted by Nikolas Andriop View Post
    I have run my Twin HPR 06 with success ....with SSS 4082 2200KV at 7S with X+ 200amp and prop 2014-17-45 ...Every thing was pretty much cold after the run

    And the same boat with the same motors WITH Flycolor 150amp (OSE Raider) at 6S HV and prop X457 cutdown to 53mm...Esc's was almost 55'Celcius temerature...

    I also run my 33.5' delta with Neu 1521 1900kv at 7S with Swordfish Pro+ 200amp and prop 1814-17-45....Results...89.5 mph..
    Below is the Delta run at 7S
    Untitled_2018_9_14_1.jpg
    Very nice Nikolas!!

  9. #39

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    I am going to try 6s on same set up and compare the numbers today.
    Going from 5s to 6s on same 1750kv motor and prop. See if amps come down with more volts.

  10. #40

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    Quote Originally Posted by Crash View Post
    I am going to try 6s on same set up and compare the numbers today.
    Going from 5s to 6s on same 1750kv motor and prop. See if amps come down with more volts.
    My guess would be opposite, considering that you're using the same prop. I'm looking forward to your results.

  11. #41

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    Quote Originally Posted by Prodrvr View Post
    My guess would be opposite, considering that you're using the same prop. I'm looking forward to your results.
    I don't have any real experience either but from what I read supplying more volts reduces the amp draw

  12. #42

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    You running the boat today to see what happens?

  13. #43

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    Quote Originally Posted by Crash View Post
    I don't have any real experience either but from what I read supplying more volts reduces the amp draw
    just got back from the pond.

    4 minute run on 6s / 1750kv / x652

    It did draw a little more amps but, not much. the data logger says it banged over 300 once but don't see it in log. it ran 250 to 280 amps at 100 % throttle.
    the rpms are up of coarse but only 29k

    6sdatalogseptember14.jpg

    I think the idea of a larger prop is out but, what about a smaller prop and more RPM?
    I may try 8s with my x546 prop tomorrow

  14. #44

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    rock n roll man

  15. #45

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    What about mph from 5s to 6s?

  16. #46

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    6 to7 mph faster but, boat is not set up to go beyond 70mph
    Its wants to fly

  17. #47

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    Quote Originally Posted by Prodrvr View Post
    rock n roll man
    Do you think its worth it to try 8s with 46mm prop to reduce amp draw? It will still be in upper 60s mph
    Last edited by Crash; 09-14-2018 at 06:11 PM.

  18. #48

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    Bring some marshmallows on 8s


    Sent from my iPhone using Tapatalk

  19. #49

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    Quote Originally Posted by photohoward1 View Post
    Bring some marshmallows on 8s


    Sent from my iPhone using Tapatalk
    ok. thanks for that ;0

  20. Default

    What esc do you have??

  21. #51

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    Sf 300 x

  22. #52

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    DID A bench test of the 8s
    Rite away the set up got hot, that's not in water . just a couple of pulls to get data..
    It only spun 35k rpm and pulled over 300 amps. Seem like that's not rite. No load and 300 plus amps. I have to look at it tomarrow Again.
    I'm starting to think that this motor that Chris fine sold me is a 1650kv not 1750kv

  23. #53

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    Which motor is it?

  24. #54

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    Quote Originally Posted by Prodrvr View Post
    Which motor is it?
    Tp 4060

  25. #55

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    Quote Originally Posted by Crash View Post
    DID A bench test of the 8s
    Rite away the set up got hot, that's not in water . just a couple of pulls to get data..
    It only spun 35k rpm and pulled over 300 amps. Seem like that's not rite. No load and 300 plus amps. I have to look at it tomarrow Again.
    I'm starting to think that this motor that Chris fine sold me is a 1650kv not 1750kv
    I used one 5s lipo and one 3s lipo
    Obviously not. A matched set...is that a problem for the esc?

  26. #56

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    As long as the esc can handle 8s, you're good.

  27. #57

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    Quote Originally Posted by Crash View Post
    Tp 4060
    What's the max voltage for that motor?

  28. #58

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    I looked it up. It's good for 8s so I'd go with that.

  29. #59

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    I have two TP 4070 2080Kv motors that I'm throwing in a Zonda build. They're rated for 6s max, so that's what I'll be running them on.

  30. #60

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    What timing are you using with that TP 4060?
    HPR C5009 Mystic twin, Genesis 37, Zelos 36 twin, Voracity 36, Miss Geico 29 V3, King of Shaves P1, Mini Zonda 27, Miss Budweiser 1/12, Delta Force 26, Offshore Infinity, Stealthwake, Vac-U-Tug Jr

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