NQD High Wind 757 upgrade

NQD High Wind 757 upgrade
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NQD High Wind 757 upgrade - 9/15/2005 5:09:56 PM

Jkeith247

Posts: 8
Joined: 9/15/2005
From: Arlington Heights, IL, USA
Status: offline

I just bought a NQD high wind 757 boat. This is my first boat and I just received it yesterday. The motors and battery get pretty hot while I am running the boat. Occasionally they will even smoke (not frequently though). Is this normal for this boat? The battery on this boat only lasts about 10 minutes tops. It s a 7.2 volt 1800mah battery. Is this normal? I am in the process of ordering new batteries for the boat. If I put a battery with a higher voltage in the boat, will it damage anything? Is it possible to install a water cooling system on this boat? Is this boat upgradeable at all? I am curious. I think I got a good deal on the boat, and would definetely like to upgrade it.

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RE: NQD High Wind 757 upgrade - 9/16/2005 11:09:05 AM

pompebled

Posts: 1814
Joined: 1/31/2004
From: Sneek, NETHERLANDS
Status: online

Hi Keith,

I'm puzzled by the 757 in the boats description, it's the winged 30"boat, powered by two 380 motor's and "vector steering" isn't it?

Basically this hull is good and can be upgraded to a single 700 motor, flexshaft, seperate rudder, 12-14 cells.
Speed in the 22-25mph range.
This upgrade will set you back at least five NOD boats, if not more...

The stock motors are hard to watercool and when you say they smoke every now and then, I fear the damage will have been done...

Regards, Jan.

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RE: NQD High Wind 757 upgrade - 9/16/2005 5:02:05 PM

Jkeith247

Posts: 8
Joined: 9/15/2005
From: Arlington Heights, IL, USA
Status: offline

Yes, you are right. The boat is the one with two 380 motors with the vector steering.
Thanks a lot for the information. When the motors smoke, it isnt terrible, if hardly at all. The motors are usually cool enough to touch. If I put a 700 motor in the boat, should I put two of them in? I do have a background in electrical engineering, so the wiring shouldn't be difficult. I havent really torn the boat apart yet though to look at the electronics inside the boat. When I replace the motors, will the electronics need to be replaced? When you say it will set me back 5 NOD boats, what exactly do you mean? I really appreciate your help in answering my questions. Where is a good place to buy all these parts?

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RE: NQD High Wind 757 upgrade - 9/16/2005 7:18:19 PM

rooski

Posts: 475
Joined: 6/27/2005
From: , SC, USA
Status: offline

quote:

ORIGINAL: Jkeith247

I just bought a NQD high wind 757 boat. This is my first boat and I just received it yesterday. The motors and battery get pretty hot while I am running the boat. Occasionally they will even smoke (not frequently though). Is this normal for this boat? The battery on this boat only lasts about 10 minutes tops. It s a 7.2 volt 1800mah battery. Is this normal? I am in the process of ordering new batteries for the boat. If I put a battery with a higher voltage in the boat, will it damage anything? Is it possible to install a water cooling system on this boat? Is this boat upgradeable at all? I am curious. I think I got a good deal on the boat, and would definetely like to upgrade it.

Jan knows his stuff so listen to what he tells you.

I'd also like to add a couple of things as I also bought one of these boats for my daughter a while back (to keep her away from my boat of course

). Be careful with this hull as it is VERY thin and VERY brittle. You will have to strengthen not only the transom but the floor of the boat as well if you want to put a real motor in there. If the front of this boat takes a solid impact (shore, log, other boat) it will disintegrate.

Also, the motors in my daughter's boat faded quickly as well although I don't think they ever smoked. My plan is to put a single 540 motor in it and use my old Super Hawaii / Purple Light steerable outdrive on it. I'll use the Pro Boat waterproof ESC instead of the switch and of course I'll get rid of that "vector push nonsense" and go with a servo driven solution.

Lastly, if you want to finish off those little 380's, you could put in a 7-cell pack (8.4v) and watch them melt thru the hull

Search these forums for other threads on the "wing speed" boat as they are basically the same thing.

Good Luck

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RE: NQD High Wind 757 upgrade - 9/17/2005 5:04:21 AM

Nocturnal

Posts: 150
Joined: 8/11/2005
From: Chesapeake, VA, USA
Status: offline

I simply upgraded mine with two 480 motors. ($9.00 a piece). They are the same diameter as the stock motors but longer. So I cut out the back side of the mounts to let the motors hang off the back and they are in perfect alignment with the shaft. It made a big difference in speed.

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RE: NQD High Wind 757 upgrade - 9/18/2005 6:57:14 PM

pompebled

Posts: 1814
Joined: 1/31/2004
From: Sneek, NETHERLANDS
Status: online

Hi Keith,

The parts I mentioned, you can get at www.offshoreelectrics.com (among others) mail Steven Vaccaro and tell him what you have in mind, he's a nice guy and will advice you on what to get. (then you'll know what I mean, regarding "setting you back..."

Basically one 700 motor is enough, though there are people who have crammed two in this hull, resulting in a very heavy, overpowered boat that is hardly drivable, there's info and video's on the single and twin 700 version, do a search.

Rooski is right on the hull, it needs reinforcing, once it's cleaned out, either by ABS sheeting, or glasscloth and epoxy resin.

It's quite a bit of work, but you'll end up with a very quick boat.

Regards, Jan.

< Message edited by pompebled -- 9/18/2005 7:02:39 PM >

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RE: NQD High Wind 757 upgrade - 9/20/2005 4:02:40 PM

Jkeith247

Posts: 8
Joined: 9/15/2005
From: Arlington Heights, IL, USA
Status: offline

Thanks to everyone for the wonderful advice. I really appreciate it. If i replace the speed control, what else do I need to replace. I ran the boat this morning, and the electronics under the black cover were smoking. I fear that I will need to replace all of the electronics in the boat including the motors. So, what all will I need? I am going to take nocturnals advice and install two 480 motors. I would also like to install a rudder, a servo for the rudder, new propellers, and whatever other electronics I will need. Thanks again for everyones advice.

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RE: NQD High Wind 757 upgrade - 9/20/2005 8:47:05 PM

rooski

Posts: 475
Joined: 6/27/2005
From: , SC, USA
Status: offline

Running dual motors will decrease the available ESC's that you can use. Novak makes one (for the dual motor Villain EX) to name one.

If you are bound and determined to use 2 motors (I wouldn't) then go for the 480's. For efficiency AND noise reduction, I would put flex couplers (4mm to 1/8" I believe) between the motors and drive shafts. Get rid of those silly, loud plastic joints. You will also have to replicate the stock reversed wiring on one of the motors to handle the left handed prop rotation. Otherwise you will get bad torque steer. Did I mention you should probably use ONE good motor?

The stock drive shafts will dramatically limit your propeller choices as they are little 1/8" threaded units....someone else will have to pipe in regarding specific threaded props you could use. I would put flex shafts in teflon liners out the back to 3/16" drive dog units. This will be efficient, quiet, and allow many many prop options...although those motors (480's) won't handle much above 38mm.
REMEMBER...with a 2 motor set-up, you have to buy 2 of everything along the drive lines which can add up.

You will also need a real 2-ch radio sytem if you want to run a servo rudder set-up and an ESC. Get the Futaba 2-ch system (2PH-AM) for 41.99 at offshore electrics. You will have to build a servo bracket inside the back of the boat. As you will see, there are not a lot of places to screw things down back there.

For rudders, consider the one shown in the picture below...available at offshore for $9. Of couse you could get a nice milled aluminum unit too for a whole lot more $.

Before you do any of this stuff you should strengthen the transom on the outside AND on the inside to beef up the stock paper thin ABS. Get some Otey's ABS glue at Lowes/Home Depot to bond the ABS to your transom. You can get a sheet of ABS at Lowe's, which is disguised as a NO PARKING....or BEWARE OF DOG sign. Cut it with quality sissors or use a box cutter.

Good luck.

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RE: NQD High Wind 757 upgrade - 9/24/2005 10:00:45 PM

SJN

Posts: 4362
Joined: 9/28/2002
From: Copenhagen, DENMARK
Status: offline

Have you seen my thread?

http://www.rcuniverse.com/forum/m_3137775/tm.htm

Maybe it can help you out somewhat.....

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RE: NQD High Wind 757 upgrade - 9/24/2005 11:45:26 PM

hellomynameisdookie

Posts: 737
Joined: 5/11/2004
From: Charlotte, NC, USA
Status: offline

Have you seen my baseball?

< Message edited by hellomynameisdookie -- 9/24/2005 11:50:05 PM >

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RE: NQD High Wind 757 upgrade - 9/28/2005 9:18:52 PM

Jkeith247

Posts: 8
Joined: 9/15/2005
From: Arlington Heights, IL, USA
Status: offline

Ok, I have a little update, I bought 2 400 permax motors and 2 graupner universal joint couplers. Everything seemed to go together easy, too easy. I ran the boat, and the couples keep slipping on the motor. It will run for about ten minutes and then the couplers start to slip, then I have to retighten them again. The hole in the coupler seems a little larger than the shaft of the motor, so I think the coupler is actually vibrating loose. Another thing that doesn't seem to help is the dinky little flat head screw in the coupler that I can hardly get tight enough to hold on to the motor with. I know the coupler is unbalanced, cause the boat buzzes like oprah's vibrator. Should I get new couplers? I spent 20 bucks on the couplers and really dont want to spend 20 more, any suggestions?

< Message edited by Jkeith247 -- 9/28/2005 9:26:27 PM >

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RE: NQD High Wind 757 upgrade - 9/29/2005 11:20:00 PM

rooski

Posts: 475
Joined: 6/27/2005
From: , SC, USA
Status: offline

Sounds like you might have gotten the wrong couplers. Someone correct me if I am wrong...but don't those 400 motors have 1/8" shafts? Is that what you got for the motor side? Also, the flex couplers are much better than any universal joint...more expensive yes, but worth it.

< Message edited by rooski -- 9/29/2005 11:38:39 PM >

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RE: NQD High Wind 757 upgrade - 10/3/2005 2:32:11 PM

Jkeith247

Posts: 8
Joined: 9/15/2005
From: Arlington Heights, IL, USA
Status: offline

So, I was bored the other day and found a couple of extra battery connectors in my tool box.

With carful thought decided to run 12 cells (two six cell packs 7.2V 30A 3300mah each).

OMG! The boat is fast with 14.4 volts. Motors got a little hot, but to be expected. I know I will probably burn the motors out pretty fast running 14.4, but the motors were 10 bucks a piece. The motors are rated to handle 7.2 to 9.6 volts. So, if I am running two motors in series, with two batteries connected in series, what resistance will the dc motors provide, both motors arent recieving 14.4 volts, right?

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