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  1. 4S is not much power for a large and heavy Dumas...

    4S is not much power for a large and heavy Dumas hull, we normally run 8S to 10S on boats that size if you want any real performance. BTW that is less than 2000 watts, not 2800 (14.8V x 135W). It...
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    Welcome. If you are going to have identical...

    Welcome. If you are going to have identical posts in multiple threads (considered poor form) the least you could do is have the pictures upright! Cool looking boat.



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    Dam*ed Toyota ad covered 2/3rds of your video!

    Dam*ed Toyota ad covered 2/3rds of your video!
  4. Thread: Genesis Cats

    by Got RPM
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    The biggest problem with the Genesis is the...

    The biggest problem with the Genesis is the 36x75mm motor - it is far too small with too high a Kv for such a large boat. Depending on the strut setting and the CG, a 45mm prop on 4S may cook the...
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    The Windy does not allow you to adjust the motor...

    The Windy does not allow you to adjust the motor position and keep the original pod/rudder. Placement of the servos and receiver battery will be your best means of balancing the boat. A couple...
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    I found that if I tried to run on the front step...

    I found that if I tried to run on the front step only the boat porpoised terribly and would flip if I kept in the throttle too long. This was accomplished by moving the CG, jet thrust vectoring...
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    I found that if I tried to run on the front step...

    I found that if I tried to run on the front step only the boat porpoised terribly and would flip if I kept in the throttle too long. This was accomplished by moving the CG, jet thrust vectoring...
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    It is generally a bad idea to run two motors off...

    It is generally a bad idea to run two motors off a single ESC. Some higher-end controllers can do it 'okay', but I'd council to use two. The biggest issue with offset thrust and linearity in boats...
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    Twins don't automatically mean more amp draw, for...

    Twins don't automatically mean more amp draw, for the same speed the total amp draw will be the same with a single or a twin. An advantage of twins is 'less' amp draw per motor meaning a cheaper...
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    The biggest cause of slow speeds with airboats is...

    The biggest cause of slow speeds with airboats is excess drag caused by too much hull in the water. A catamaran can have less drag than a flatty, but the best would be an outrigger design. Next...
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    Realize that what you are used to with EDFs in...

    Realize that what you are used to with EDFs in the air is not going to happen with a boat, not enough speed to make the fans unload and become fully efficient. They will push the boat, but will not...
  12. The Kv is too high, amp draw will be high and the...

    The Kv is too high, amp draw will be high and the small prop needed will not be efficient. The Kv needs to be around 1500-1700.



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  13. Either should work well, I ran the ProBoat 1500...

    Either should work well, I ran the ProBoat 1500 on 4S in a 34" catamaran and got mid-60s (km/h). Setting up a hydro can be a bit of a challenge (CG, strut depth) but that motor on 4S with a good...
  14. Lots of folks run the motors I listed or...

    Lots of folks run the motors I listed or equivalents with wonderful results in 1/10 scale hydros. The ESC should be 120 amps minimum. Boats pull a LOT more amps than planes and even most 3D Helis. ...
  15. Very poor advice! That motor has far too high of...

    Very poor advice! That motor has far too high of a Kv for a 37.5" boat on 4S, it will not be efficient and will overheat quickly. A 37mm prop is too small for that size boat too, and it will not go...
  16. What size motor? What size boat? What prop? ...

    What size motor? What size boat? What prop? Which ESC? .
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    That is a pretty high Kv for a boat that size,...

    That is a pretty high Kv for a boat that size, it's twice the size of you smaller hull. What prop are you using? I suspect that you just don't have enough thrust for that large hull.


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  18. In order to help you we will need more...

    In order to help you we will need more information. Have you built and run an FE in the past? What is the size of the boat? Where will you run it? What are your performance expectations - speed,...
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    I'm sure you think the boat is 'extremely fast',...

    I'm sure you think the boat is 'extremely fast', but I know what I'm talking about. I hold - and have held - numerous speed records with FE hydros, and the way you have that one configured it will...
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    It is certainly not running anywhere near 150...

    It is certainly not running anywhere near 150 km/h but I am certain it is still a lot of fun. We would love to see photos of it.

    The heat is because you are over-powering the electronics. The...
  21. This really doesn't make sense - unless there is...

    This really doesn't make sense - unless there is a direct short the packs can't get hot enough to explode in 3 seconds of running. The OP needs to tell us more: exact boat and size, the ESC, the...
  22. Hard case is usually not the best way to go for...

    Hard case is usually not the best way to go for boats. Most all experienced boaters use soft case packs.


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  23. Thanks for the input1 Qwk, data is always good to...

    Thanks for the input1 Qwk, data is always good to have. The OP will need more motor and power to achieve comparable speeds - depending on what he wants for speed. And 4S will not be enough either,...
  24. Yes it is. Here is the thread which explains...

    Yes it is. Here is the thread which explains what I did.


    http://www.rcuniverse.com/forum/rc-scale-boating-103/11394863-kreigsmarine-explosive-r-c-boat.html


    Most modern brushless ESCs work...
  25. That is 'way too much prop for that motor, you...

    That is 'way too much prop for that motor, you will burn up the ESC and then the motor. The prop size is a bit big for the boat although it may work with the right motor. I suggest an outrunner...
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