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May 29, 2019, 09:12 AM
Jetdrives R Us
sundogz's Avatar
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FAQ

new Official NQD Tear Into mod thread


The old 'unofficial' NQD thread has become so large and rambling that it is difficult to find good usable information even when doing a search. So here is a new 'Official' thread to post your info in. As it fills up I will include an index to the pertinent articles to make cross referencing easier as I did in the 3D thread. The NQD is again difficult to find after years of cheap availability, but resurgences have come and gone in the past. And there is now a bare hull available that will make builds much easier. Long live the Tear Into!!
Last edited by sundogz; May 29, 2019 at 02:13 PM. Reason: misspelling!
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May 29, 2019, 01:46 PM
Registered User
KiwiKrawler's Avatar
Good on ya Sundogz...a new thread on these cool little jet sprint boats is well and truely over due. Letís start with a couple of introductory pics of the boat in question.
May 29, 2019, 02:21 PM
Jetdrives R Us
sundogz's Avatar
Thread OP
Here is the link to the bare hull sold by Aliexpress. Or you can pay more and get all the goodies with it...except the roll bar?! Hmmm. Maybe someone will come up with an .stl file to be able to 3D print one!
May 29, 2019, 05:11 PM
How about this for the "recommended mod list":

I haven't used mine much and it has no water cooling so far, never really needed it but I will use it a lot more this year so I want to finally get it sorted out.

What's are the best ways to add a water intake? The two most common approaches seem to be either using a cheap aftermarket nipple or to simply get a small section of pipe and grind an angle onto it and glue it into the nozzle.

Is there an optimum place to put it?

Does the angled DIY inlet have an advantage over an off the shelf part?

Would having it intrude too far into the nozzle effect performance?

And what diameter water hose is needed to fit on the motor cooling jackets and water cooled ESCs
Last edited by nowinaminute; May 29, 2019 at 05:32 PM.
May 29, 2019, 05:14 PM
3d printable micro/mini servo mount here:

https://www.thingiverse.com/thing:1600197
May 29, 2019, 05:17 PM
Handy 3d printable mount for putting a full size servo in the same position as the stock servo here:

https://www.thingiverse.com/thing:3144104
May 29, 2019, 05:29 PM
Some neat 3d printable "bling" to make the dummy motor look better.

Blower:

https://www.thingiverse.com/thing:2332137

Headers:

https://www.thingiverse.com/thing:2357394

Other 3d printable stuff:

Battery holder: https://www.thingiverse.com/thing:2979893

Nozzle protector: https://www.thingiverse.com/thing:3336115

Locking cover (used in conjunction with some plexiglass) https://www.thingiverse.com/thing:3559564

Impeller (would probably need to be printed in nylon or poly-carbonate or some other high strength plastic but who knows? Maybe something more modest like PETG would be ok) https://www.thingiverse.com/thing:2952090

Trim tabs: https://www.thingiverse.com/thing:2513088
May 29, 2019, 09:30 PM
Jetdrives R Us
sundogz's Avatar
Thread OP

Water pickup nipple


Quote:
Originally Posted by nowinaminute
.... the best ways to add a water intake?
A short piece of 1/8" tubing with a slight angle on the the end that is inserted (at a slight angle) between two stator fins, protruding inside just slightly, and epoxied in place provides ample water flow. Pictures explain it best....
Jun 02, 2019, 12:15 AM
Registered User
KiwiKrawler's Avatar
Quote:
Originally Posted by nowinaminute
How about this for the "recommended mod list":

I haven't used mine much and it has no water cooling so far, never really needed it but I will use it a lot more this year so I want to finally get it sorted out.

What's are the best ways to add a water intake? The two most common approaches seem to be either using a cheap aftermarket nipple or to simply get a small section of pipe and grind an angle onto it and glue it into the nozzle.

Is there an optimum place to put it?

Does the angled DIY inlet have an advantage over an off the shelf part?

Would having it intrude too far into the nozzle effect performance?

And what diameter water hose is needed to fit on the motor cooling jackets and water cooled ESCs
Just a short piece of 1/8inch(3mm) tube is all you need.

The best place is on the leading edge of one of the stator vanes...as the impeller sweeps past it. Not only does it offer a better fixing due to the fact the vane is there for support(as opposed to the centre between the vanes). But it is the area of greatest water pressure so subsequently you will get the best water flow through your cooling system.

Obviously anything intruding, protruding, or otherwise restricting the water flow will effect performance. It will still work even if the nipple is flush as there’s so much positive pressure there...but a slight angled end will increase its performance.

And instead of purchasing nipples or a length of copper pipe to make your own...there an extremely popular confectionary out there that has a perfect piece of tube that’ll do the job just nicely.
Last edited by KiwiKrawler; Jun 02, 2019 at 01:23 AM.
Jun 02, 2019, 01:42 AM
Registered User
KiwiKrawler's Avatar

Tear Into roll bars


And while weíre on the subject of re-purposing things. Hereís my take on making roll bars for my tear.

As many already know the now available hulls from Ali express do not include any roll bars. So after looking at several options...I stumbled across something that was right under my nose. Literally. Every time I watered my vege garden.

Check this out. This black plastic tubing of a diameter of 7mm is irrigation raisers to sprinkler heads of a basic and readily available home garden irrigation system.
Jun 02, 2019, 01:45 AM
Registered User
KiwiKrawler's Avatar
With a bit of gentle heating from my Dremel butane torch the plastic tubing is easy to bend.
Jun 02, 2019, 01:47 AM
Registered User
KiwiKrawler's Avatar
And the little fittings that connect the irrigation tubing together conveniently take a 5mm metric nut. So bolting the newly fabricated roll cage to the boat is as easy as...watering the garden.
Last edited by KiwiKrawler; Jun 02, 2019 at 01:55 AM.
Jun 02, 2019, 01:50 AM
Registered User
KiwiKrawler's Avatar

Tear Into roll cage


And although a bit over scale...Iím sure the new cage will keep the boys as safe as houses. 🙃
Jun 02, 2019, 02:16 AM
Just Plane Nutts
AirDOGGe's Avatar
The stock plastic bar is very fragile. When mine failed I made a couple of replacements from 3mm copper hobby tubing by K&S and some lengths of black heat shrink tubing. Brass works too. They came out looking very close to stock, fit right into the original roll-bar holes and are lightweight and super durable.




Last edited by AirDOGGe; Jun 02, 2019 at 02:24 AM.
Jun 02, 2019, 03:55 AM
Registered User
KiwiKrawler's Avatar
I did consider using copper tubing...and must admit A-DOGGe yours looks really cool dressed in black heatshink. But the reason I decided to not use it is cos of weight. And buoyancy. Weight above the water line does nothing but raises the centre of gravity. Which is far from ideal from a handling perspective. And copper sinks like a brick. Plastic floats. I like to bounce around in white water rapids. If my boat goes turtle in a rapid I donít want the rollcage to act like a lead keel in a sail boat and not give it the chance to self right. These things go sooo much better right side up!


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