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Unofficial "NQD" Tear into Jetboat Thread

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Old 10-09-2012, 08:46 PM
  #3076
Masman
 
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Hey guys, long time no post, just got everything working today, but the engine appears to be spinning in the shaft. (Supposed to be same size (2.3mm)http://www.hobbyking.com/hobbyking/s...erCooled_.html) Ideas?

EDIT: Resolved, well more so was never an issue, I'm blind apparently.
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Old 10-09-2012, 11:35 PM
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On the maiden (Pool test) the engine firstly was running backwards, then decided to unscrew the screw on the shaft, anyone got tips on how to get that back in?
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Old 10-10-2012, 01:55 AM
  #3078
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With a 1.5mm hex driver?? Not sure I get the question correctly, you mean the grub screw in the coupling?
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Old 10-10-2012, 04:14 PM
  #3079
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Yes that was exactly what I was after, I couldn't work out if it needed a hex driver or something else. thanks!

EDIT: The only issue left now is the servo arm pops off after a few minutes, this is my first hobbygrade rc venture, so if there is some way of securing the arm other than just putting it on please inform me
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Old 10-10-2012, 07:35 PM
  #3080
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Quote:
ORIGINAL: Masman

EDIT: The only issue left now is the servo arm pops off after a few minutes, this is my first hobbygrade rc venture, so if there is some way of securing the arm other than just putting it on please inform me
The servo arm or 'horn' is secured to the servo with a semi-pointed, short screw.
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Old 10-11-2012, 02:50 PM
  #3081
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alright, been an eventful weekend for the tear into...
Yesterday I brought it up the beach, I even brought the charger and ran that off the car battery (worked a treat)
We went up with a couple of mates, and I now have a jet boat mate in the making (Just gotta order a new kit... thinking of making an Outrunner on 2S for him)

After many batteries through the boat, it was sucking in water through the jet drive and it sounded horrible because the drive shaft was vibrating... In the end, I could only JUST get the boat up on plane, there was that much water/vibration happening I have to say, I think salt water is abrassive... compared to running in fresh water, the wear and tear is noticable

Today I decided to pull the boat down and give it a good once over, new glue, grease every moving part and most importantly, do the sleeve mod!
The sleve mod came out really good I reckon, I should have done that from the get go... The plastic was ground away, so much so, that I could nearly put the 1/8th inch rod in without driiling!!
I've got pics of all of this, but need to get them off my camera, I'll post once I've sorted that out

So, right now, I'm charging my batteries, to take the boat out for a test run. The boat is curing in the sun at the moment

Cheers
Martin
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Old 10-13-2012, 09:41 PM
  #3082
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I should have done that sleeve mod ages ago!! 
The jet drive primes instantly, I can go full pelt across waves, and by the time it hits the top of the next wave, it's primed and pushing through the air to the next wave...

I also took the chance to reconfigure my ESC, which had a cut-off at 6V!! No wonder my batteries were feeling a bit rough...
I also adjusted the punch level down by 20%, and I think that combined with the jet drive mod, is what gives me prime so quickly...

Good times

Cheers
Martin
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Old 10-13-2012, 10:43 PM
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I think sleeving the drive is the only way to go, well for me anyways... The first 3 boats that i had were terrible from factory, either bent shafts or poor alignment. So by the second i ditched stock drive shafts too and never looked back. Plus its part of the fun.

Make your mates on 3s..
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Old 10-14-2012, 06:49 AM
  #3084
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I will have all winter to mod my boat. Never got to maiden it do to renovating my master bath this summer myself. Took all summer but I'm very happy with the results.
So.... I really want to take your advice and do the sleeve mod but I don't know where to begin. I would love to see your pics and suggestions so I understand it fully.
I will take my time and do it right this winter and be ready for some rapid fun next spring.
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Old 10-14-2012, 02:42 PM
  #3085
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Quote:
ORIGINAL: SkR8Pn
Make your mates on 3s..
That'd mean his boat is potentially quicker than mine... HAHAHAHA
He is on a bit of a budget, so an outrunner on 2S might fit the bill... Plus it'd be more interesting for me to build, as it's a different setup

Quote:
ORIGINAL: Wheelnut
I really want to take your advice and do the sleeve mod but I don't know where to begin. I would love to see your pics and suggestions so I understand it fully.
Too easy, I hope the pics make sense

This is what I used: about 20mm of 1/8th inch copper tube & Tarzan Grip Glue (shoe glue or whatever works just fine... this is what I had)
  1. Pull the drive out of the boat, and take it apart
  2. Where the drive shaft goes through the jet drive, use a 1/8th inch drill to drill a new hole
  3. Slide the copper tube through
  4. glue it in place (I only placed glue on the water side of the jet drive... see pic if that didn't make sense, I only glued once)
  5. let it dry
  6. add marine grease and your rubber seal
  7. assemble the drive
  8. then all is done
The other thing to check regularly, is the prop... I've run my boat on large sand flats on the out going tides (= wicked currents and sand mounts to jump off )
The prop is definitely the weaker link, and the blades get steadilly shortened, creating a gap between the tip of the blade and the wall of the jet pump... not ideal at all!!

New prop, New drive shaft and sleeved jet drive = no water in the boat and better than factory speed/takeoff!

I added a pic from my beach trip too

SkR8Pn: Could you please let me know what you have replaced the driveshaft with? And how you got the prop to keep put??

Cheers
Martin

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Old 10-22-2012, 11:09 PM
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Quote:
ORIGINAL: seehuusen

SkR8Pn: Could you please let me know what you have replaced the driveshaft with? And how you got the prop to keep put??

Cheers
Martin

Don't really have a set rule ondriveshafts, Either what i have laying about or can machine to fit... Between the length of thedriveshaft and the coupler i make, holdthe impellerin place. Hope that helps

Sorry i didnt reply sooner, i've been busy machining, if you ever need couplers etc let me know
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Old 10-23-2012, 01:03 AM
  #3087
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finally received the replacement Leopard 4450 kv motor and tested it out.
there is smoke and burnt mark spotted on one of the motor cables initially, stopped for a while and continued play with no adnormality, total play time ~ 8 mins.

setup : Turnigy 60A ESC + Leopard 2040 series 4450kv Motor + 2S 4000mah 40~80C Lipo + Cooling tubes

so the Outrunner 4400 kv motor will be much faster than Leopard 4450kv motor although their top rpm are almost the same?

Quote:
ORIGINAL: sundogz


Quote:
ORIGINAL: spektrumFlux

so the Outrunner 4450kv motor will outperform the Leopard 4450kv Motor?
I suppose Outrunner motor do not need any water cooling jacket?
That particular outrunner is much more powerful than the 2040 size Leopard. And because it is not pushed that hard, does not build up as much heat. But if you are concerned about heat, you can do what Damfurst did (see previous post) and make a cooled mount (Good job, Danfurst!)

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Old 10-23-2012, 04:31 AM
  #3088
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Quote:
ORIGINAL: SkR8Pn

Sorry i didnt reply sooner, i've been busy machining, if you ever need coupliers etc let me know
Those are nice looking couplers with the three setscrews on each end. Should be able to balance those easily! What would you have to get for one (shipped in the states)?
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Old 10-23-2012, 04:39 AM
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Quote:
ORIGINAL: spektrumFlux

finally received the replacement Leopard 4450 kv motor and tested it out.
there is smoke and burnt mark spotted on one of the motor cables initially, stopped for a while and continued play with no adnormality, total play time ~ 8 mins.


so the Outrunner 4450kv motor will outperform the Leopard 4450kv Motor?
Try it and see! It is a stronger motor at 600watts vs 220 for the Leopard. Sure sounds like you got a bad batch of motors.
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Old 10-23-2012, 04:59 AM
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ok, will probably get the Outrunner.
btw..any suggestion on where to get the 3.17-2.3 mm coupling?


Great thanks :-)


Quote:
ORIGINAL: sundogz


Quote:
ORIGINAL: spektrumFlux

finally received the replacement Leopard 4450 kv motor and tested it out.
there is smoke and burnt mark spotted on one of the motor cables initially, stopped for a while and continued play with no adnormality, total play time ~ 8 mins.


so the Outrunner 4450kv motor will outperform the Leopard 4450kv Motor?
Try it and see! It is a stronger motor at 600watts vs 220 for the Leopard. Sure sounds like you got a bad batch of motors.
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Old 10-23-2012, 06:28 AM
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Quote:
ORIGINAL: sundogz


Quote:
ORIGINAL: SkR8Pn

Sorry i didnt reply sooner, i've been busy machining, if you ever need coupliers etc let me know
Those are nice looking couplers with the three setscrews on each end. Should be able to balance those easily! What would you have to get for one (shipped in the states)?

You have a pm mate
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Old 10-23-2012, 07:27 AM
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Thx, J.
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Old 10-23-2012, 09:12 AM
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Now I'm jealous[&:] pm me too
I would be happy if somone could just tell me where to get couplers in the US.
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Old 10-23-2012, 12:13 PM
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Quote:
ORIGINAL: SkR8Pn
Sorry i didnt reply sooner, i've been busy machining, if you ever need couplers etc let me know
We all get busy from time to time, I've been meaning to re-solder 1 bullet connector, 2 weeks later, nothing has been done about the bullet connector... LOL

These "kits" look familiar, Maryborough-lad?
would you mind PMing me,what sort of coin would you want from a fellow forumite for one of those?

cheers
Martin
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Old 10-24-2012, 07:30 AM
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Quote:
ORIGINAL: seehuusen


Quote:
ORIGINAL: SkR8Pn
Sorry i didnt reply sooner, i've been busy machining, if you ever need couplers etc let me know
We all get busy from time to time, I've been meaning to re-solder 1 bullet connector, 2 weeks later, nothing has been done about the bullet connector... LOL

These "kits" look familiar, Maryborough-lad?
would you mind PMing me,what sort of coin would you want from a fellow forumite for one of those?

cheers
Martin
Lol I do similar things... I'm known to lack motivation working on my own stuff from time to time!
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Old 10-24-2012, 01:24 PM
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Quote:
ORIGINAL: Wheelnut

Now I'm jealous[&:] pm me too
I would be happy if somone could just tell me where to get couplers in the US.
ignored once again
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Old 10-24-2012, 05:36 PM
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Quote:
ORIGINAL: Wheelnut


Quote:
ORIGINAL: Wheelnut

Now I'm jealous[&:] pm me too
I would be happy if somone could just tell me where to get couplers in the US.
ignored once again

Turn that frown upside down....... you have been inboxed
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Old 10-27-2012, 09:21 PM
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Hey guys,
I've started gathering a list of things I need for my next tear into. I've stumbled across a new motor that I think would work wonders as a high powered Tear Into on 3S
The motor has an additional 160 watts of power compared to my current NQD (760 in total) and a better KV rating in my mind, should be fun
tried posting this a couple of times, so now it's just going to be a teaser LOL
Here's the list
eBay: AU$69.04
re"> BL2856 3200KV Inrunner Water Cooled Brushless Motor
re"> 150A Water Cooled ESC 5A BEC For RC Boat
eBay: AU$6.99
re"> Coupler 2.3 mm to 4 mm - Brass
eBay: AU$7.89
re"> FS-GR3C 2.4Ghz 3CH Failsafe Receiver
eBay: AU$7.60
re"> MG995 Servo - Metal Gear, High Speed/ Torque, Digital Servo
I'll obviously do the sleeving of the drive straight away
This one will probably also recieve a bit of paint, to try to make it look a bit like my ski boat's colour scheme
I'll report back when it all starts arriving
cheers
Martin
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Old 10-27-2012, 09:59 PM
  #3099
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Sounds good Martin... Even betterare the prices, nice work.
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Old 10-28-2012, 02:50 AM
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do kindly correct me if my understanding is incorrect for the following...
suggested motor kv for each types of Lipo.
2S : 3900~4450 kv Inrunner/Outrunner Motor
3S : 2900~3600 kv Inrunner/Outrunner Motor
4S : 2600~ kv Inrunner/Outrunner Motor
2S*3900 kv = 7.4*3900 = 28860 rpm
3S*3900 kv = 11.1*3900 = 43290 rpm (is it too high rpm to cause motor overheat rapidly)
what is the ideal rpm range for motor?

comparing Inrunner 4400kv vs Outrunner 4400kv motor, Outrunner will have more torque?
what is the criteria to choose between Inrunner and Outrunner motor?
Thanks
Regards :-)
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