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Thread: ML Boatworks RSX380 Outrigger! My first FE wood kit build...

  1. #391
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    The c.o.g. is right at the turn fin trailing edge.

    Hmmn, I setup up three drive modes, each with differing dual rates, 100%, 75% & 50%. Suppose I should try them, huh? Forgot about using them and it wasn't a problem running slower...

    Please recommend Octura props in the X or M series that compares in size to what I'm running now. It's a ABC 2018-10-50(2)-CLL. And why to use them? They don't list their rake angles, so I didn't buy any.

    Thank you for all your help...

    Here it is, balanced on a spare boom tube...

    The rake angle on the Octura X & M series is 10 degrees. The same as your ABC prop you have listed above.
    However. Your 2018-10-50 has a pitch ratio of 1.8. That's a lot of pitch.
    I would be inclined to say, that is most probably the cause of your tail hop and prop torque steering issue.

    A pitch ratio of 1.4 or 1.6 would be more stable than 1.8

    The 17 series prop you have ordered will have less lift. But what diameter & pitch did you order?

    I find that it is best to have the bottom of strut level with the table when both front & rear sponsons are sitting flat on the table.
    That puts it horizontal with the waterline when on the plane.

    Just my thoughts on the matter. However I run the RSX310 not the 380.

    Cheers.

  2. #392
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    Quote Originally Posted by rol243 View Post
    don,t those octura x series props have more pitch than your 2018 abc ?
    I don't think so. At least not total pitch

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  3. #393
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    woops, my boo. i meant the octura has less pitch than that abc prop.

  4. #394
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    Quote Originally Posted by 785boats View Post
    The rake angle on the Octura X & M series is 10 degrees. The same as your ABC prop you have listed above.
    However. Your 2018-10-50 has a pitch ratio of 1.8. That's a lot of pitch.
    I would be inclined to say, that is most probably the cause of your tail hop and prop torque steering issue.

    A pitch ratio of 1.4 or 1.6 would be more stable than 1.8

    The 17 series prop you have ordered will have less lift. But what diameter & pitch did you order?

    Cheers.
    I just received a ABC 2015-17-45 & 2016-17-45 prop.

    And since I placed the order before you commented back, I also got a 1819 & 1917 prop. Both are ABC props in the 17-45 series.

    Better to try more props than less I say. And I also plan on doing SAW runs later, so one of them might be The Prop...

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  5. #395
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    Quote Originally Posted by 785boats View Post

    I find that it is best to have the bottom of strut level with the table when both front & rear sponsons are sitting flat on the table.
    That puts it horizontal with the waterline when on the plane.

    Just my thoughts on the matter. However I run the RSX310 not the 380.

    Cheers.
    Yeah, that's where I started off the bench. I plan on going back to that with these props. It ran on rails there, so probably both the RSX380 & the RSX310 have similar design characteristics.

    Also, it took a long time to warm up here. The lipos run so much stronger above 75 degrees or so. I may have changed my trim settings too soon. Should have just waited for warmer weather, the speed would have came.

    I'll be testing more soon...

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  6. #396
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    you can buy cheap lipo heater bags or place your lipos on the car floor and turn on the heater as you drive to the lake.

  7. #397
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    Got out again for a SAW run and some laps. And used steering dual rates. Got lucky and nailed it at 50% on the first attempt. At least it's right with this setup and running on glass.

    Sure is nice cranking the wheel all the way and knowing it's gonna carve the turn...

    https://youtu.be/ytlN5A1DhCc

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  8. #398
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    So, before I received feedback here on props, I had ordered a ABC 1820-22-45(2)-CLL, because that was the only higher rake prop OSE had in stock at the time. And I was wanting to try a higher rake prop.

    I had it prepped, so that's what I ran in my latest video. And I set the strut level with the rear shoes with a slight positive angle (.010). So basically back to a bench tune.

    I came close to matching my top speed (81.4mph) on the SAW run.

    Then I ran laps with the goal of figuring out steering dual rates. With 50% dual rate it made what looks like right the size turn. And I ran close to the right size laps for heat racing (I've paced 230' off on shore, crude I know, but gives me some reference anyway).

    Here's my question... What speed should this rigger run on laps on 8s? My GPS showed 67.9mph on fairly consistent speeds on the straights and turns...

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    Last edited by sammyha; 07-29-2019 at 11:37 AM.

  9. #399
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    In race water if you can keep those speeds and not wipe out you would be doing well. There is a big difference between running approximate laps on your own, and racing around bouys with 5 other boats. It brings a totally different dynamic. in oval racing having the fastest boat doesn't mean you will win!
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  10. #400
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    Quote Originally Posted by Peter A View Post
    In race water if you can keep those speeds and not wipe out you would be doing well. There is a big difference between running approximate laps on your own, and racing around bouys with 5 other boats. It brings a totally different dynamic. in oval racing having the fastest boat doesn't mean you will win!
    I can believe that. It's tough enough with my limited experience at these speeds to lay down uniform laps. I was just curious to how my setup is running. I've watched some racing videos, looks crazy. Thanks

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    Last edited by sammyha; 07-29-2019 at 10:09 PM.

  11. #401
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    with the best prop set up i would think you should average around 70 mph with the 8s rigger. also set up for saw with the best prop should give you 100 mph providing you also have a good run up lake.

  12. #402
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    Quote Originally Posted by rol243 View Post
    with the best prop set up i would think you should average around 70 mph with the 8s rigger. also set up for saw with the best prop should give you 100 mph providing you also have a good run up lake.
    Thanks for the feedback... Whew! From what I've seen so far, those are pretty impressive numbers. At the same time, I've seen how much difference the setup makes.

    That's exactly what I was wondering. Laps and SAW runs. It takes time and effort to test setups. I need to get after it, our season is short...

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  13. #403
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    For the record I want to note that all but one of the runs I've made on this rigger is posted on YouTube. So I only have about a half a dozen runs or so on it. It's been a busy summer for me with overtime at work and projects at home.

    The only run not posted was of a day I ran all three of my boats, and I had my head cam tilted down and filmed nothing but water...

    I say this as a testimony to the quality of Mike's design. Lazer cut kits. And all the details he spends time on to get right before releasing it.

    It has no bad habits...

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  14. #404
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    just like any boat hull being mono to outrigger hydro, they all need fine tuning so maximum performance is gained and this does take time.

  15. #405
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    Any updates on this?

    Just read it fully and contemplating one for some left over 6s equipment... more would be a sport setup with a quick prop change to SAW capabilities... just undecided on this or trying to package in the smaller boat a 6s setup.
    Hpr 06 / 09 / 150 /185, Mhz Skater H45 hydro.
    Uk SAW record holder

  16. #406
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    Quote Originally Posted by vvviivvv View Post
    Any updates on this?

    Just read it fully and contemplating one for some left over 6s equipment... more would be a sport setup with a quick prop change to SAW capabilities... just undecided on this or trying to package in the smaller boat a 6s setup.
    No updates, besides the fact that I love the boat, the design, the handling. No bad characteristics that I can tell. Nice kit to build too.

    I think 6s would be fine if you built it light. I think you would benefit from the longer length. It tracks nice.

    Mine came in at nine pounds all up with 8s lipos in it. Keep it around seven pounds on 6s and you should have a great saw run rigger...

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  17. #407
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    im thinking Lehner maybe 2240/7 or similar around 1900-2000kv

    Or am i going to see flames hmm.
    Hpr 06 / 09 / 150 /185, Mhz Skater H45 hydro.
    Uk SAW record holder

  18. #408
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    Please help. RSX380 outrigger with 4092 1390 kv 2218-10-50 abc prop on 6s can't figure out amps for speed controller. And would this be a good 6 lap setup? Thanks in advance. Oh I'm a rookie.

  19. #409
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    Quote Originally Posted by Troy1957 View Post
    Please help. RSX380 outrigger with 4092 1390 kv 2218-10-50 abc prop on 6s can't figure out amps for speed controller. And would this be a good 6 lap setup? Thanks in advance. Oh I'm a rookie.
    What batteries are you running?
    I race a sport hydro with a TP 4060 1350k, Panther Graphene 6s 6000 mah, ZTW 200 esc on a ABC 1915 17 45 prop., speeds in the 100+ kph. Different hull type but it's a ballpark. I think you should start smaller on props and work up.
    Either the ZTW 200 esc or one of the Castle offerings, mamba X or XLX2
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  20. #410
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    Haven't even thought about battery brand. And I guess 6000mah. And I'm guessing that 2218 prop would be for saw run?

  21. #411
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    Peter are you running 1 6s battery or 2 3s?

  22. #412
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    Quote Originally Posted by Peter A View Post
    What batteries are you running?
    I race a sport hydro with a TP 4060 1350k, Panther Graphene 6s 6000 mah, ZTW 200 esc on a ABC 1915 17 45 prop., speeds in the 100+ kph. Different hull type but it's a ballpark. I think you should start smaller on props and work up.
    Either the ZTW 200 esc or one of the Castle offerings, mamba X or XLX2
    Im with Peter, a ztw 200 will work with that motor. But not that 2218 prop. If you want to push the system hard, Id run a Castle hydra

    https://www.offshoreelectrics.com/pr...as-010-0173-00
    Steven Vaccaro

    Where Racing on a Budget is a Reality!

  23. #413
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    Quote Originally Posted by Steven Vaccaro View Post
    Im with Peter, a ztw 200 will work with that motor. But not that 2218 prop. If you want to push the system hard, Id run a Castle hydra

    https://www.offshoreelectrics.com/pr...as-010-0173-00
    Would you suggest a couple of props please.

  24. #414
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    Quote Originally Posted by Troy1957 View Post
    Peter are you running 1 6s battery or 2 3s?
    One 6s battery.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  25. #415
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    Id start with an octura 1450 and move up or down from there with testing.
    Steven Vaccaro

    Where Racing on a Budget is a Reality!

  26. #416
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    Quote Originally Posted by Steven Vaccaro View Post
    Id start with an octura 1450 and move up or down from there with testing.
    Awesome Thanks Steven

  27. #417
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    Update on my RSX380. I've got it running in the nineties! I'm still learning, lol...

    Specs on the boat- Motor Leopard 4092 1390kv, Esc ZTW 200 amp on 8s. I just bought a pair of 4s SMC lipos and this was on an ABC 1820-22-45 prop.

    Remember, if it don't make your knees knock it's not with doing!

    Here's the video...

    https://youtu.be/bhynil2ZiyU

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  28. #418
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    Very nice speed! And yeah, things start to get a bit sketchy and scary once up near the triple digit mark. That's how you know you're doing it right!

  29. #419
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    The SMC lipos test out well. I have a set for one of my riggers, but have yet to test them.
    Any idea on what difference just the SMC Lipos made?
    Cheetah, Super Rio, (Mod) Starship (Mod and sold),

  30. #420
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    Quote Originally Posted by larryrose11 View Post
    The SMC lipos test out well. I have a set for one of my riggers, but have yet to test them.
    Any idea on what difference just the SMC Lipos made?
    My previous best was 82mph. With same basic setup it did 91mph yesterday. Today I moved the batteries all the way back and ran an ABC 1820-22-45 prop(was 1819-17-45) for the 93mph run.

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