dubs chops

THis thread needs to come back to life! I just finished my boat using a 2858 motor

http://www.hobbyking.com/hobbyking/s...arehouse_.html

I coupled it with this speedo and everything seems just about perfect on 3s
http://www.hobbyking.com/hobbyking/s...C_4A_UBEC.html

sundogz

Sounds like a good combo. Pics, videos?

dubs chops

I will get some posted up asap. I am just over from you in OK and it is freezing balls off here right now.

sundogz

Yeah, winters are getting crazier and crazier. I have a Pursuit I put a jet drive in and am antsy to take movies of it too. It will thaw (someday) hopefully!

dubs chops

Nothing too exciting, But here is the heart of the beast!

dubs chops

busted the roll cage so I had to come up with a way to make it removable. figured I would beef it up a little while I was at it.

Jasenk

I finally went and ran my modded NQD with 3S Lipo and Brushless setup. I was running solo so the video was the phone in one hand taking video and controlling throttle and steering with the other hand. Not easy. Video suffered a bit. See the description for what I'm running. I didn't notice any cavitation. I did notice a lot of left trim was needed even though the nozzle was straight. Maybe the jet wash wasn't coming straight out.

Here are the videos:

https://www.youtube.com/watch?v=zMx-qbviu6s https://www.youtube.com/watch?v=zMx-qbviu6s

https://www.youtube.com/watch?v=63QySz3Tf0U https://www.youtube.com/watch?v=63QySz3Tf0U

I hope to take it in some streams later this season. Maybe catch some rapids.

MacofTampa

Hello I'm new to the NQD world, I have a motor and ESC from a Losi Mini 8ight-T. Its a Dynamite Fuze 4500kv, I plan on reining this on 2S. My question is am I just trying to use what I have on hand or is this a viable motor esc to start with....thanks Mike

sundogz

Yes, that will work. You'll need a different coupler - the jets' shaft is 2.3mm, your motor shaft is 2mm.

MacofTampa

sundogz,

thanks for the reply....I measured the shaft last night and it was 2.3 mm. I just got the Tear Into a few minutes ago and I'll test fit it once I get it apart....Thanks again I'm sure there will be more questions....thanks again....Mac

sundogz

Yeah, I got the info on your motor here but you can't believe what you read on the web!

MacofTampa

I tore apart the NDQ and re-measured the motor shaft and you are correct I need a new coupler and I would like to add the bearing mod to the pump....I'll be looking for sources for both....If you have suggestions I'm all ears....Mac

sundogz

This might do. What bearing mod?

MacofTampa

I thought there was a mod to install a bearing to support the impeller shaft between the rubber seal and the motor coupler. I thought I saw something in this tread talking about it but not much detail...Mike

sundogz

There have been many trials with bearings, flex shaft, lining the bore with brass tubing and none have shown in the long run to markedly improve on plain old marine grease. The front will be supported by the motor coupler, the rear by the bushing. Keep the shaft lubed with a sticky marine grease and you will have the best results in performance and longevity. This will keep aeration to a minimum as well. Smooth metal against smooth hard plastic has very low friction and low maintenance requirements. Keep it simple. If you need more speed, go to a larger motor (not necessarily faster or higher kv) to break thru the 'torque' ceiling. This will require a higher amperage esc as well. Or for best performance, go to a 28mm drive such as a KMB or similar.

reefboarder

Hi guys, first poster here! I've read about 50 pages of this thread so far and am tiring of looking for an answer. I already have some 4s 2200mah packs with deans connectors and would really like to be able to use them instead of putting money into other packs. By my figuring I would need a motor in the 2000kv range ( if that exists) my real question is this, what ESC would handle that? I am a relatively new rc hobbyer.

I have an erevo 1/10 scale and also have the feilun ft011 that I'm getting rid of and now have an impulse 31v2.

I am infatuated with this little boat and have mine gutted and am trying to put together a plan. I live in upstate NY so I have access to TONS of streams and rivers and can't wait to give this guy going!

sundogz

Those 4s lipos will be fine. In fact, you can get away with a lesser amp esc - a 30A (watercooled) esc will do the trick. And you are right on with the kv rating. I'm sure there are plenty to choose from, try looking at outrunners - they won't require cooling in this boat. Be sure to get a coupler that will adapt the motor shaft to the 2.3mm jet drive shaft.

reefboarder

How about this guy. http://www3.towerhobbies.com/cgi-bin...XDSEC&P=0#tech
It works out to about 30000 rpm

sundogz

It's really a little too high in kv - this isn't a 30K jet drive. Perhaps more important, you'll need a water jacket to fit. An inrunner can build up damaging heat depending on battery condition and C-rating, how aggressively it is driven, ambient temperature, sealed hull and other variables.

reefboarder

think I'm gonna go with this esc.
http://www.hobbyking.com/mobile/view...dproduct=10627

And this motor.
http://www3.towerhobbies.com/cgi-bin...&I=LXBHKN&P=ML

Haven't come up with a servo yet. I have a spectrum dx2e TX does anyone know if I can drop in another Rx and use it? Or can I only program the TX to one boat at a time?

Ratrunner

That esc is way overkill for this little boat.

You need more close to 30A.
I have a 30A Turnigy marine ESC in mine.


And that motor is way too expensive.

Try this one.

http://www.hobbyking.com/hobbyking/s...dProduct=12919

Cant help with the other questions though.

Jason.

reefboarder

Thanks Jason. That motor is only for up to 3s according to the specs. I already have 100 bucks in 4s batteries so I'm trying to build the boat to suit. I also may eventually go with a bigger jet unit and/or try my hand at a scratch build, so the extra money invested into the nqd would be shifted else where at a later time. I am hoping to also find stuff not backordered so I can get it in the boat reasonably soon. I have heard horror stories of pulling the trigger on HK backorder items only to tire of waiting and have to buy else where while fighting for a refund.

On a another note, does anyone recall the traxxas setup that people were using in the "beginning" of the nqd fad? I've started to re read the thread trying to find the specifics but haven't gotten to it yet.

sundogz

Reefboarder, that motor should do fine. I agree with Ratrunner that it is a bit pricey, but I am unable to come up with a cheaper alternative. Hobbyking is out of a bunch of stuff lately, wonder what that is all about? And I agree that the 90A esc is overkill. Try to stay around 35A. Never heard of the Traxxas conversion and I've been with this forum (NQD) since the beginning - maybe it was the RCGroups forum.

reefboarder

Yeah it was definitely the rcg forum where I read that. My only hold up on the ESC is that they all say 2-3s lipo. So I'm trying to find the lowest "A" rating for 4s I've found the hobby king 50a to be about the smallest that will run on 4s. Believe me, I'm not trying to disregard the advise being given, just trying to find the right stuff for my situation.
I found a much cheaper motor from HK it's a 28-47 1800kv, just need a jacket for it as HK is backordered on everything it seems.

I am growing closer to just selling the packs as they're pretty new (only like 3 cycles on each) and just going 3s, as my impulse takes 3s packs also. They wouldn't last long in it but would work.
And the backorder situation on HK is annoying! Every time I find something that will work its either in Australia or backordered.

Would it be safe to assume that other 28mm water cooling sleeves would actually fit a 28mm motor from HK? There are plenty of options on eBay or Amazon that claim 28mm size.

Another option would be to just get the ESC and TX/Rx for the feilun ft011 the whole set would cost about 30 dollars plus shipping it's a 4s ESC rated for 65a, its water cooled and sealed.
Is there a reason to not over rate the ESC a little? Heat? Or is just in terms of not being necessary for the power required in this boat?

sundogz

Yes, any 28mm water jacket should fit, so get one from Ebay. I found this 30A esc that is for 2-6S use in boats. Should work nicely. But I agree, going to 3S would make everything much easier. You can use a larger esc, it is just more weight (but that can be a good thing too) and cost.