|Dec 17, 2012, 06:14 PM|
|Dec 17, 2012, 06:22 PM|
And anyway, from her point of view you are only 'playing with your toys'. Shopping, on the other hand, is a matter of life or death. If you are a woman, that is.
|Dec 17, 2012, 11:29 PM|
Joined Sep 2012
About to finally do it
So I was about to order parts for my NQD, and this is what I came up with, let me know if I am on the right track?
The Controller and battery will come later, just getting these parts now so I can start the modifications. Water here is frozen till April anyways.
|Dec 18, 2012, 01:58 AM|
Scratch built 24" V hull Jet boat
Yellow Boat Hull 3
The hull is 4 inches longer than Yellow Boat 1 the keel is fiberglass and epoxy as are the chines, everywhere else its hot glue. Much cleaner hull then the earlier boats but still a bit ugly.
These hulls are tough as, run them into rocks do what you like they just flex. I suppose they would fail at the seams when they do, that's why I glassed in the keel.
The ride plate is glassed in on the inside so its really stiff, as the pump is all outboard I have recessed the transom to hide it away a bit. Its a big jet unit.
Room for 2 X 11.1V 2200mAh 20C batteries in parallel should deliver up to 80 + Amps. Ran this on test over 2 Kgs of thrust on a 3C @ 54 Amps
Turnigy 450 H2218 Brushless outrunner 2100KV with homebrew water cooling added, big bore pipes just because that the brass I had in stock.
Hobbyking SS Series 90-100A ESC with a water cooling plate added its an overrated ESC so should do the job easy. Will need a BEC I have a 5A in stock also.
The Cooling System
|Dec 18, 2012, 02:28 AM|
Put a prop on it
Put a prop on it
Prototype and general knockabout boat Yellow Boat (hull 1) with a pusher aero prop aero hybrid drive system 365 Grams thrust 9.6 Amps
Floater-Jet Replacement Motor (AXN-2208-2150)
Max Watts: 180w
Max Amps: 20A
Max Volts: 11.1 (3s)
Magnet type: N45SH
Idle Current: 1.52A
Suggested Prop: 5x5 / 6x4
P2632 Brushless Outrunner 3800kv
Battery: 2~3 Cell /7.4~11.1V
Max current: 32A
No load current: 11.1V/3.2A
Internal resistance: 0.036 ohm
Diameter of shaft: 2.3mm
The NQD delivers 950 Grrams of thrust with this motor on a 11.1 V Lipo
Pusher only no steering but still planes
Hull still planes with 365 Grams of thrust from the aero prop only. The jet delivers 950 Grams btw.
|Dec 18, 2012, 03:14 AM|
These pics aren't the lastest, will get some more up once iv put things together a bit more. Have almost finished the top deck so thought id weigh it just with a 1700mah 2s lipo. 550 grams! But that's total weight without a motor. The motor weighs 153 grams so a total of 700-750 grams aint too bad. Or is it?
|Dec 18, 2012, 06:47 AM|
|Dec 18, 2012, 12:49 PM|
Looks like my pattern
That will be a really seaworthy hull I play with my Coroplast design in the surf and have only capsized once.
Yellow Boat weighs around 750 Grams at launch with a 2200mAh lipo
The weight for your boat should be good should go well. Looks around 20" like Yellow Boat
I measured the thrust from an NQD unit the other day and got 950 Grams of thrust on 11.1V with a P2632 3800kv motor pulling 34 Amps, around 375 Watts
Weight / Watts = 4 Grams per Watt
Thrust / Watts = 2.53 Grams per Watt (which is a bit like and EDF jet in air)
This is what my design is a homage to btw yours is similar
Yellow Boat 3
|Dec 18, 2012, 01:33 PM|
You scratch builders are living my dream. If I had a bit more time on my hands I'd be building boats from scratch all the time.
I've wanted to build an aluminum hull jet drive RC boat longer than I knew there were RC pumps. Thanks for sharing them.
My ultimate RC goal is to someday build a jetdrive powered hydrofoil.
|Dec 18, 2012, 01:39 PM|
I was not able to find a HK motor I wanted at the time, so I went to Ebay, got a 2100(apprx?). I'm happy with it, but if I was to do it all over again, I'd try to find a 3000 for more speed in the lakes. The 2000 range motor is very adequate for rivers as far as I'm concerned.
|Dec 18, 2012, 01:55 PM|
|Dec 18, 2012, 02:06 PM|
I have tired up to 4200kv on a 3C which was too fast for the NQD In think
My 3800kv runs well on a 3C I think (know) that there is a limit to the amount of water you can force though the nozzel of the NQD
On a bath test the 3800kv moves water well and primes Ok at full speed if you lift the inlet clear and re-immerse it.
Also the power level is good at 375 Watts drawing 34 Amps the 3800kv is the bets motor I have run an the NQD jet pump I think.
I have a larger unit 30mm home made with a 2100kv its a bit of an unknown quantity , initial testing is encouraging with lots of thrust and with the lower RPM there is scope for more batt cells
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