Unofficial "NQD" Tear into Jetboat Thread
#2827
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RE: Unofficial
ORIGINAL: Wheelnut
Do you have it sealed somehow? When the top of the hull is cut and the hatch is only held on by two loose clips, it's hard to believe it wouldn't take on much water upside down. It would even be worse in a stream with small rapids.
Do you have it sealed somehow? When the top of the hull is cut and the hatch is only held on by two loose clips, it's hard to believe it wouldn't take on much water upside down. It would even be worse in a stream with small rapids.
#2828
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RE: Unofficial
ran the jetboat today, the new ESC has way more punch
I've re-arranged everything in the boat again, pretty much a half build new waterproofing for the servo and receiver, as well as a new pod for the ESC... I've also moved the battery further back, and I now think I need a cavitation plate, as I'm having slight issues keeping prime...
I've taken photos of the new setup, will post when I get a chance
cheers
Martin
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RE: Unofficial
ORIGINAL: Joshsubmec
How do ya'll split the top half from the bottom half? please post pics or whatever it takes to explain it, thanks.
How do ya'll split the top half from the bottom half? please post pics or whatever it takes to explain it, thanks.
Regards josh
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RE: Unofficial
ORIGINAL: Joshsubmec
How do ya'll split the top half from the bottom half? please post pics or whatever it takes to explain it, thanks.
How do ya'll split the top half from the bottom half? please post pics or whatever it takes to explain it, thanks.
Regards josh
It might be a misconception that we split the upper and lower hull apart... Normally people just cut a hole in the hull, under the hatch/ "two drivers"... It might be possible to separate the two, but I've not seen anyone do it, they appear to be the only place where the factory actually applied glue that worked HAHAHA
Attached is the new setup of my boat, I've moved it all further back to give the boat a better approach angle in the creeks... Those of you who don't drive 4WD, approach angle on the boat would be how low the nose sits in the water compared to the rear of the boat. I'm hoping by lifting the nose a bit higher and lowering the rear, I can angle the nose higher in the air and thus make it up steaper water currents (I hope that made sense LOL)
I have found that I will now need to add the stabilizing metal flap on the jet drive as the boat is bouncing around a bit too much on higher revs, and so, it looses it's prime...
Pick attached of the new setup
Cheers
Martin
#2833
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RE: Unofficial
ORIGINAL: hqdby1
Yeah you'll need a motor, servo, bat and esc to run an upgraded jet boat.
These work well and are very long lasting with good speed also:
http://www.hobbyking.com/hobbyking/s...dProduct=12613
http://www.hobbyking.com/hobbyking/s...dProduct=11875
http://www.hobbyking.com/hobbyking/s...idProduct=7377
Then just any old car/boat servo really.
Yeah you'll need a motor, servo, bat and esc to run an upgraded jet boat.
These work well and are very long lasting with good speed also:
http://www.hobbyking.com/hobbyking/s...dProduct=12613
http://www.hobbyking.com/hobbyking/s...dProduct=11875
http://www.hobbyking.com/hobbyking/s...idProduct=7377
Then just any old car/boat servo really.
beside getting the above ESC, Motor and Lipo battery, do I need any other stuffs during the modification process.
I suppose we can still use the stock servo, Tx and Rx right?
btw, does the Jet boat capsize easily?
Thanks.
#2834
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RE: Unofficial
ORIGINAL: spektrumFlux
hi, I'm a newbie into RC boat and just ordered the Jet boat too. :-)
beside getting the above ESC, Motor and Lipo battery, do I need any other stuffs during the modification process.
I suppose we can still use the stock servo, Tx and Rx right?
btw, does the Jet boat capsize easily?
Thanks.
hi, I'm a newbie into RC boat and just ordered the Jet boat too. :-)
beside getting the above ESC, Motor and Lipo battery, do I need any other stuffs during the modification process.
I suppose we can still use the stock servo, Tx and Rx right?
btw, does the Jet boat capsize easily?
Thanks.
#2835
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RE: Unofficial
ORIGINAL: Scubaru Steve
servo, tx & rx need to be replaced. boat is very steady, ive only flipped once. crashed into a rock boat flew through the air and landed upside down.
ORIGINAL: spektrumFlux
hi, I'm a newbie into RC boat and just ordered the Jet boat too. :-)
beside getting the above ESC, Motor and Lipo battery, do I need any other stuffs during the modification process.
I suppose we can still use the stock servo, Tx and Rx right?
btw, does the Jet boat capsize easily?
Thanks.
hi, I'm a newbie into RC boat and just ordered the Jet boat too. :-)
beside getting the above ESC, Motor and Lipo battery, do I need any other stuffs during the modification process.
I suppose we can still use the stock servo, Tx and Rx right?
btw, does the Jet boat capsize easily?
Thanks.
how do you seal up the compartment for better water resistant?
#2836
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RE: Unofficial
Hey spektrumflux.
I believe you could incorperate that stock servo with a little bit of wiring..problem is, no one uses that type of servo anymore with the good stuff(Spektrum, Futaba, JR, etc.) They all use the standard 3 wire servo wires as you probably have seen. The only way i could see the 5 wire servo setup they have in there working is with an old setup that no one seems to makes anymore..i had this setup in a somewhat old plane bout 7 years ago. So that servo is pretty much out of the picture. Sorry
#2837
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RE: Unofficial
ORIGINAL: Joshsubmec
Hey spektrumflux.
Hey spektrumflux.
I believe you could incorperate that stock servo with a little bit of wiring..problem is, no one uses that type of servo anymore with the good stuff(Spektrum, Futaba, JR, etc.) They all use the standard 3 wire servo wires as you probably have seen. The only way i could see the 5 wire servo setup they have in there working is with an old setup that no one seems to makes anymore..i had this setup in a somewhat old plane bout 7 years ago. So that servo is pretty much out of the picture. Sorry
I suppose it's a complete system overhual to turn it into a beast... :-)
will probably get the following items...any comment on the compatibility?
http://www.hobbyking.com/hobbyking/s..._Boat_ESC.html
http://www.hobbyking.com/hobbyking/s...erCooled_.html
http://www.hobbyking.com/hobbyking/s...g_0_11sec.html
http://www.hobbyking.com/hobbyking/s...io_System.html
http://www.hobbyking.com/hobbyking/s...Lipo_Pack.html
need coupling to fit motor shaft to propeller?
#2838
RE: Unofficial
You should use a 2S lipo with that motor, and don't forget a balance charger. Also, with that motor you can use the stock coupler. The reason people change servos is the stock one isn't proportional. Turn it right, it goes full right, turn left, it goes full left. There's no in-between.
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RE: Unofficial
ORIGINAL: sundogz
You should use a 2S lipo with that motor, and don't forget a balance charger. Also, with that motor you can use the stock coupler. The reason people change servos is the stock one isn't proportional. Turn it right, it goes full right, turn left, it goes full left. There's no in-between.
You should use a 2S lipo with that motor, and don't forget a balance charger. Also, with that motor you can use the stock coupler. The reason people change servos is the stock one isn't proportional. Turn it right, it goes full right, turn left, it goes full left. There's no in-between.
is those Mini servo (torque : 2.6 kg/cm) like Hitec HS-81 adequate for usage?
so using a 3S Lipo will burn the Motor?
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RE: Unofficial
need folks advise as still newbie.
what's the relationship between ESC, Motor and Lipo selection?
- higher 60A ESC better than 35A ESC?
- Motor kv selection dependent on ESC A?
- Lipo selection, i.e 2S or 3S depend on Motor used?
Thanks
#2841
RE: Unofficial
ORIGINAL: spektrumFlux
need folks advise as still newbie.
need folks advise as still newbie.
what's the relationship between ESC, Motor and Lipo selection?
- higher 60A ESC better than 35A ESC?
- Motor kv selection dependent on ESC A?
- Lipo selection, i.e 2S or 3S depend on Motor used?
Thanks
#2842
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RE: Unofficial
Hey guys,
I had a promotional email from Tower for $20 off a $50 purchase. So I ordered two of the traxxas 2080 water proof servos. I will use one of them on my NQD and the other on my Mini Summit However, I can't believe that they came with out servo horns[:@] I mean really??? What the heck??[:'(] That is the first time I have ever received a servo with out servo horns. Come on Traxxas, you SUCK!!! JR and Hitec always come with servo arms. Lesson learned. So now I have to order servo horns
I had a promotional email from Tower for $20 off a $50 purchase. So I ordered two of the traxxas 2080 water proof servos. I will use one of them on my NQD and the other on my Mini Summit However, I can't believe that they came with out servo horns[:@] I mean really??? What the heck??[:'(] That is the first time I have ever received a servo with out servo horns. Come on Traxxas, you SUCK!!! JR and Hitec always come with servo arms. Lesson learned. So now I have to order servo horns
#2843
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RE: Unofficial
ORIGINAL: sundogz
Yes if you want to stick with the 3S lipo, go with a motor around 3000kv. Actually, the 4800kv is too much and will top off before you reach full throttle. 4500kv should be tops with a 2S unless you go with a larger (24 or 28mm can) motor. A mini servo might not hold up for long. There's plenty of room inside, so go with a standard servo. A good 35A esc will do fine, but a 60A esc will give you some headroom. A cheapy will probably fail you no matter what brand. Buy the highest "C'" rating lipo you can afford - you will be able to notice the extra power and it will last you much longer without 'puffing'.
ORIGINAL: spektrumFlux
need folks advise as still newbie.
need folks advise as still newbie.
what's the relationship between ESC, Motor and Lipo selection?
- higher 60A ESC better than 35A ESC?
- Motor kv selectiondependent on ESC A?
- Lipo selection, i.e 2S or 3S depend on Motor used?
Thanks
- so ESC A is not dependant on Motor kv selection?
- what's the benefit of using a 60A vs 35A ESC if using the same Motor?
- so Lipo 2S or 3S usageis dependant on Motor kv, 2S when using higher kv (4000) and 3S when using lower kv (~3000) Motor?
- is it a must a get a water cooled Motor?
oh...I thought the compartment will be too squeezy to fit a standard servo.
understand that the 4800kv Motor shaft fit nicely into the stock coupling, if getting the lower kv motor might need to source for a new coupling.
any advise on where to get those stuff?
Thanks. :-)
#2844
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RE: Unofficial
ORIGINAL: spektrumFlux
thanks for the advise. :-)
- so ESC A is not dependant on Motor kv selection?
- what's the benefit of using a 60A vs 35A ESC if using the same Motor?
- so Lipo 2S or 3S usageis dependant on Motor kv, 2S when using higher kv (4000) and 3S when using lower kv (~3000) Motor?
- is it a must a get a water cooled Motor?
oh...I thought the compartment will be too squeezy to fit a standard servo.
understand that the 4800kv Motor shaft fit nicely into the stock coupling, if getting the lower kv motor might need to source for a new coupling.
any advise on where to get those stuff?
Thanks. :-)
thanks for the advise. :-)
- so ESC A is not dependant on Motor kv selection?
- what's the benefit of using a 60A vs 35A ESC if using the same Motor?
- so Lipo 2S or 3S usageis dependant on Motor kv, 2S when using higher kv (4000) and 3S when using lower kv (~3000) Motor?
- is it a must a get a water cooled Motor?
oh...I thought the compartment will be too squeezy to fit a standard servo.
understand that the 4800kv Motor shaft fit nicely into the stock coupling, if getting the lower kv motor might need to source for a new coupling.
any advise on where to get those stuff?
Thanks. :-)
ESC amp rating is dependent on what motor you use. Most motors come with recommendations, but as a general rule for the motors we use, a 60amp water cooled ESC will do nicely (smaller can be used on the 2S setup)
The benefit of using the correct rated, or over rated ESC is that you will run less of a chance of burning it out. I personally run a 120amp good quality ESC in my boat (28mm motor on 3S). Over the recommended amperage, I can't say whether or not it is better, but I can say that in any case, it's better than my cheap 60amp ESC... Whatever the reason is, it's a better quality ESC, and it never runs hot!
So, to explain this whole Kv rating VS lipo rating... the KV rating is, 1000rpm x 1V e.g, you run a 3S setup on a 1000KV motor, you'll be running the shaft on the motor at 11.1 x 1000K = 11.100rpm. With this in mind, what we try to do, is aim for an optimal rpm level on the prop. We calculate approximately 20% loss, due to friction etc. If we aim for a 28.000 rpm rang, we'd need to get a:
28.000/11.1 = 2522KV @ 100% optimal so 2522 x 1.2 = 3027KV on a 3S setup
28.000/7.6 = 3684KV @ 100% optimal so 3684 x 1.2 = 4421KV on a 2S setup (the 1.2 is how to calculate an extra 20% for those wondering )
Regarding water cooling, I've heard of people who has run without it, but I would highly recommend it, these things pack a punch mate!!
Last thing, coupler, so the prop shaft is 2.3, if the motor you bought/ buy has a 2.3mm shaft, you won't have to do anything if it's larger, you can either drill it out or buy one on ebay. I got one that was made of brass, it was for a submarine!!
Lastly, you might still wonder, what's the go between 2S and 3S, imagine this, V8 vs 4 cylinder = 3S vs 2S basically, the 3S system can overcome a pressure barrier in the jet drive better, giving it more punch and better top speed
Good luck mate
Martin
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RE: Unofficial
by the way, I run an 11.5KG servo in mine, with metal gears and all, it's nice and torque
PS. no servo, water proof or not, is actually waterproof. Do yourself a favour and wrap a baloon around it
PS. no servo, water proof or not, is actually waterproof. Do yourself a favour and wrap a baloon around it
#2846
RE: Unofficial
I'm not sure how, but receivers and servos that are enclosed in balloons will sure as rain acquire some moisture. This has been told time and again. The best way to waterproof servos and receivers is Conformal Coating or spray Liquid Electrical Tape. I use the latter and have had no problems. I also am a fan of higher voltage/lower amperage running and use 3S batteries in this boat. I'm currently running a 3000kv outrunner with no water cooling. Quite fast and no appreciable heat buildup after long runs.
#2847
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RE: Unofficial
Using balloons to water proof receivers in rc boats is very common and works great. they even sell "Receiver Balloons" at offshoreelectrics.com. You should even use some silicone on the opening where the wires comes out.
#2848
RE: Unofficial
That is bound to be how the moisture gets in - around the wires. Yes, sealing the opening with non-acetic silicone would do it. But spraying on conformal coating is much easier and just as effective, IMO. I has the added benefit of not trapping heat like a balloon enclosed speed control would.
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RE: Unofficial
great thanks to all folks for your patience and the detail explanation, really appreciate. :-)
got to spend time to digest all these information. :-)
should be getting the following, I suppose they work well.
- Turnigy Marine 60A ESC
- 2040SL 4800kv Motor (2.3 mm shaft diameter fit into stock coupling, so no need to source for another coupling. right?)
- 2S 2200 mah 40~80C Lipo
Thanks
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RE: Unofficial
that's the exact same motor i have in mine.
on 2S, it will work well, but beyond about 75% throttle, it will just make more noise.
i have the 35A Turnigy marine ESC in mine, and that's been faultless.
im running on 2S 2200 nanotech battery with great results.
Jason.
on 2S, it will work well, but beyond about 75% throttle, it will just make more noise.
i have the 35A Turnigy marine ESC in mine, and that's been faultless.
im running on 2S 2200 nanotech battery with great results.
Jason.