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Search: Posts Made By: grael
Showing results 1 to 25 of 500
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Forum: Speed - Electric
07-30-2013, 02:19 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

I think it would be straining even to spin a 10mm impellor!
Forum: Speed - Electric
07-14-2013, 10:54 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

sundogz-
Lurking mostly, yes.
I have to change projects now and then to keep life interesting[8D]<br type="_moz"/>
Forum: Speed - Electric
07-14-2013, 10:52 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Mickie-
I had an electronics and software business for 4 years.. my dream job! Mine came unstuck with too much time in the same house as the ex...
Forum: Speed - Electric
07-13-2013, 11:53 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Look like you've been putting a bit of spare $ into the project!

These sort of things (modern 3D printers) are pushing a world revolution in fast conception to manufacture.

For lower quantity...
Forum: Speed - Electric
07-12-2013, 09:35 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

"Coughs" Remember this ?
http://www.youtube.com/watch?v=rEj1ainByTs
:-)
Nothing wrong with a stepped hull jetboat...
I stopped designing them after that one, it did all I wanted and more.
Forum: Speed - Electric
07-12-2013, 09:30 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Hi Mick,

I was planning to do a similar thing back about 5 years ago.
I designed and built my own circuitboard in the end- http://grael-minifactory.blogspot.co.nz/
After doing the development in...
Forum: Speed - Electric
07-04-2011, 10:27 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

I Hadn't thought of that... should have though, I have one driving my much neglected CNC PCB design.Link the green and black wires from memory to power up...My charger's worked great so far.
Forum: Speed - Electric
07-03-2011, 09:23 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Sorry to hear about your roasting issues ISIRC10, we're in the middle of winter here in New Zealand, so I'm having problems at work with plastic being brittle ! I'll remember this though, my PETG...
Forum: Speed - Electric
06-26-2011, 09:00 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Hi Sundogz,

I had to reread to see that you have a jet drive in it as well as 2 x EDFs.

Firstly, the jet cavitating. put a constriction in the outlet nozel, just taper it in slightly. Easy to...
Forum: Speed - Electric
05-07-2011, 08:53 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Sometimes we get a little bit off topic from<span style="font-size: x-large; ">"<span class="Apple-style-span" style="font-family: verdana, arial; white-space: nowrap;...
Forum: Speed - Electric
05-03-2011, 01:03 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Your battery was probably supplied with only partial charge (normal), and hasn't been charged yet ?
Forum: Speed - Electric
04-29-2011, 01:58 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Ouch! expensive learning...
Speed controller connects direct to battery.
Speed controller with "BEC", the 3 pin socket goes on the receiver, channel 3, brown or black is negative. battery...
Forum: Speed - Electric
04-24-2011, 01:11 PM
Replies: 4
Views: 566
Posted By grael

RE: How fast?

try something like this to get a scale speed:

model speed = 30mph, length = 2 foot

fullsize speed??, length = 40 foot.

full sized versus model ratio is 40/2 = 20

square of model...
Forum: Speed - Electric
04-23-2011, 01:44 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

One of my boats, I used circuitboard material for the mount, soldered side pieces on that also got cooled by the air flow. Also, cooled water mounts can be as simple as an aluminium angle that is...
Forum: Speed - Electric
04-23-2011, 01:21 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

It's turning out to be a deeper V, still figuring out how to blend in the sides as they come in to the bow. So it's not simply scaled up. I also put more steps in at the bow, so it's hopefully going...
Forum: Speed - Electric
04-23-2011, 01:39 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Tyrap V2 under construction !

Longer hull, 800mm long. I'm building the ribs at the moment, then skinning in MDF, quite a lot of work to get it just right, again, this is another stepped monohull....
Forum: Speed - Electric
04-20-2011, 10:43 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

That pretty much sums it up. Brown wire is negative(to edge of receiver, and check the impeller is connected to the motor shaft and doesn't slip. If you can't feel air coming out when your run the...
Forum: Speed - Electric
04-20-2011, 04:05 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Check if air coming out via nozel or intake. If coming out intake, swap 2 x motor leads around.
Otherwise, check impeller tight on motor drive shaft.
<br type="_moz" />
Forum: Speed - Electric
04-13-2011, 09:25 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Yeah, it's mint now, but it won't look like a real jetboat until it's clattered over some stones a few times.
http://www.rcuniverse.com/forum/js/fckeditor/editor/images/smiley/msn/teeth_smile.gif
Forum: Speed - Electric
04-12-2011, 01:34 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

I need to get my a into g and get something similar started here, good on you for making it happen http://www.rcuniverse.com/forum/js/fckeditor/editor/images/smiley/msn/thumbs_up.gif Hope your racing...
Forum: Speed - Electric
04-11-2011, 10:10 AM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

http://www.rcuniverse.com/forum/js/fckeditor/editor/images/smiley/msn/lol.gif
Now all the flabby people can surf with a simple flick of the wrist.

Not!

I doubt the 20 pounds thrust lasts for...
Forum: Speed - Electric
04-08-2011, 10:33 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

I still have to get my own drives in order firsthttp://www.rcuniverse.com/forum/js/fckeditor/editor/images/smiley/msn/teeth_smile.gif

I have a few decent stator-outlet moulds, but I've been busy...
Forum: Speed - Electric
04-03-2011, 10:15 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Nice deep V, but I was looking for a comparison with something that can turn tightly and stay powered up... I didn't see it in that video.
Just looking for something maybe to make me feel...
Forum: Speed - Electric
04-02-2011, 11:27 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

Hi sundogz,
I was just thinking, what's a good video of a model scale hi performance deep V that tracks well and turns tight ?
I was watching mickiebl's video and thinking how much better my design...
Forum: Speed - Electric
03-22-2011, 08:34 PM
Replies: 5,017
Views: 707,542
Posted By grael

RE: The Unofficial all things Jet drive thread

I don't fully agree guys on this cavitation/aeration thing.

When I've had aeration problems, it's always been worse with less constriction at the nozzle. You want the pump full of water, but if...
Showing results 1 to 25 of 500
 
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