Sprintcat .40 - "Norm"

[crabstick]

This is my latest FE project. was going to go twins until i saw the new turnigy outrunner and pressed buy!

It is a sprintcat .40 no hatch, I plan to make a flatish cowl with an enclosed cockpit
I have fixed a large hole in the hull by filling the hole with 3 layers of glass cloth, then one layer over the entire tunnel floor, im going to put some rails in and lay a layer of carbon down for safe keeping.

Power is going to be the Turnigy 4030 1100kv outrunner on 6s - According to Jason @ HK they outsourced the design and manufacture to the factory that makes Hacker motors, take from that what you will.
http://img24.imageshack.us/img24/1901/turnigy.th.jpg (http://img24.imageshack.us/i/turnigy.jpg/)

ESC - Hextronic 120amp , custom watercooling

Cells - Rhino 25-35c 6s1p initially

starting prop will probably be around the m445 mark then upwards and onwards

LOTS of work to go, but thats half the fun.
http://img9.imageshack.us/img9/5434/img00369201005081001.th.jpg (http://img9.imageshack.us/i/img00369201005081001.jpg/)
http://img704.imageshack.us/img704/7031/img00368201005081001.th.jpg (http://img704.imageshack.us/i/img00368201005081001.jpg/)

[crabstick]

edited into first post

[Fluid]

If that motor's performance is anything like the Scorpion HK4025/1100, don't waste time with a 45mm prop. That's too small for the hull anyway and will hardly load the motor. I've run an x450 pitched up and pulled less than 65 amps in my SprintCat40. What capacity cells are you planning on using?


.

[crabstick]

Thanks Jay, I was wondering the same thing. It more of an initial run prop to see if anything breaks.

To start with I will just be running 5000mah 25-35c 6s1p that I have. If it shows promise I will buy 2 5000mah 40c 6s1p packs and parallel for 10,000mah

What props have you found useful on your sprintcat40 with the outrunner?

[Brushless55]

very interested to see how well this motor runs in this hull :thumbup1:

[crabstick]

So am I if HK post ever get their butts into gear and ship it to me :olleyes:

[crabstick]

Update:

I have laid another layer of glass and a layer of carbon from the transom about 200mm up the tunnel.

http://img695.imageshack.us/img695/3977/img00375201005150821.th.jpg (http://img695.imageshack.us/i/img00375201005150821.jpg/)

http://img202.imageshack.us/img202/6403/img00374201005150821.th.jpg (http://img202.imageshack.us/i/img00374201005150821.jpg/)

Tomorrow I will be cranking up the compressor and priming the outside of the hull also the carbon cylcone, According to the tracking, my motor should be delivered monday so it will be all go!

[crabstick]

lots of sanding today, and its now got a couple of coats of primer

http://img194.imageshack.us/img194/7875/img00376201005161747.th.jpg (http://img194.imageshack.us/i/img00376201005161747.jpg/)

http://img4.imageshack.us/img4/2127/img00377201005161747.th.jpg (http://img4.imageshack.us/i/img00377201005161747.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

[crabstick]

Check the tracking on my motor this morning, Delivered to the PO box, Woohoo! But it didn't come when the girls went to get the mail, walked the 50 meters to the post office and had the ladies find it for me..

Behold!

The Turnigy 600, 1100kv

http://img62.imageshack.us/img62/1125/img00379201005171009.th.jpg (http://img62.imageshack.us/i/img00379201005171009.jpg/)

http://img180.imageshack.us/img180/3226/img00378201005171008.th.jpg (http://img180.imageshack.us/i/img00378201005171008.jpg/)

the quality looks pretty damn impressive and as you turn it you can feel each pole, I counted 24 notches in a 360degree rotation does that mean its 12 pole? Who knows? One thing is for certain, this Bad Boy is a monster!

Off to the engineering shop shortly to get some alloy to make a motor mount and some stainless cap screws for mounting!

[Brushless55]

what size is the shaft?
so is this an 8s motor?

[crabstick]

6mm shaft,

I plan to run it on 6s, with a large wheel :smile:

[Brushless55]

will the be enough rpm?

[crabstick]

should be...

We will find out very shortly. I may have to go up to 8s, but will try 6s first - Pretty sure Fluid runs his 1100KV scorpion 4025 on 6s in his sprintcat 40 - Fluid can you confirm ?

[crabstick]

Next question on the Agenda - Shall I run 3/16 or 1/4 flex cable ?

[Fluid]

I run the HK4025/6 on 6S1P in my SprintCat, spinning an x455. It is a little faster on an x557, but less run time.

For 6S the 3/16" cable is plenty; for 8S it will work if you don't run too high power a system or large diameter props. A club member runs a 3/16" cable on a mild 10S mono setup, props no larger than x450. It seems reliable......


.

[crabstick]

Thanks for the reply Jay, 3/16 it is!!


Just off to the engineering shop to see if I can find some alloy thick enough to put a water jacket in, but will still leave me plenty of shaft lenght.

[crabstick]

beginning the mock up of the internal layout

http://img199.imageshack.us/img199/4378/img00381201005171732.th.jpg (http://img199.imageshack.us/i/img00381201005171732.jpg/)

http://img16.imageshack.us/img16/249/img00380201005171731.th.jpg (http://img16.imageshack.us/i/img00380201005171731.jpg/)

[Jeff Wohlt]

Still looks tiny in that hull. Amazing the power they put out.

[crabstick]

the hull sure does dwarf the motor.

Couldn't find the right alloy yesterday, so no engine mount as of yet.

[crabstick]

Update, got a little done last night - mocked up the rails and engine mount from cardboard, will cut the rails from wood tonight, progress is slow at the moment as im still prepping boats for club champs this weekend

http://img268.imageshack.us/img268/5075/img00390201005182120.th.jpg (http://img268.imageshack.us/i/img00390201005182120.jpg/)

http://img708.imageshack.us/img708/3268/img00389201005182118.th.jpg (http://img708.imageshack.us/i/img00389201005182118.jpg/)

[Brushless55]

Sweet, looking good!
I'm stoked to hear how well this motor does for you..

[Simon.O.]

Nice to see another OR powered cat in town. I am sure yours will be be a fair bit qucker than mine though. :thumbup1:

I can't get down for the champs this weekend as I am on duty, still keen to get there one day.

Bring on the Cats. :banana:

[crabstick]

All Good Simon, we aren't going anywhere.

I got the day off tomorrow so am going to test my Whiplash, N2 Shovel and Gas Class 1, also setting up the bouys for the course at about 2pm.

Once club champs are done with then I can get back into building this cat

[crabstick]

we have rails! not epoxied in yet, but will do that once the engine mount is made

http://img641.imageshack.us/img641/9794/img00416201005242023.th.jpg (http://img641.imageshack.us/i/img00416201005242023.jpg/)

http://img130.imageshack.us/img130/7023/img00414201005242021.th.jpg (http://img130.imageshack.us/i/img00414201005242021.jpg/)

Going to hang the stuffing tube from the rear cross brace

[crabstick]

Made the engine mount tonight, 30X10mm alloy, fitted the motor to it with 4mm stainless cap screws , have pilot drilled it vertically for water cooling and also recessed the coupler into the mount, Just drilling the rails for the mount and drilling and tapping of the mount to go and then its onto glassing the rails in.

http://img686.imageshack.us/img686/3483/img00423201005252059.th.jpg (http://img686.imageshack.us/i/img00423201005252059.jpg/)
http://img135.imageshack.us/img135/2387/img00425201005252101.th.jpg (http://img135.imageshack.us/i/img00425201005252101.jpg/)
http://img63.imageshack.us/img63/3042/img00428201005252135.th.jpg (http://img63.imageshack.us/i/img00428201005252135.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

[Xfactor]

Looks good!:cool2:

[crabstick]

Cheers Dude,

http://img338.imageshack.us/img338/8291/img00431201005252231.th.jpg (http://img338.imageshack.us/i/img00431201005252231.jpg/)

http://img257.imageshack.us/img257/6559/img00430201005252230.th.jpg (http://img257.imageshack.us/i/img00430201005252230.jpg/)


Just a couple more pics of the mount in the rails sitting roughly where it will live in the boat, got a visitor last night so didn't get as much as I planned done.

[crabstick]

Motor mount now attached to the rails, just need to make a couple of things and then they can be epoxied in.

http://img686.imageshack.us/img686/8255/img00433201005261903.th.jpg (http://img686.imageshack.us/i/img00433201005261903.jpg/)
http://img245.imageshack.us/img245/8162/img00434201005261949.th.jpg (http://img245.imageshack.us/i/img00434201005261949.jpg/)
http://img25.imageshack.us/img25/4282/img00435201005261949.th.jpg (http://img25.imageshack.us/i/img00435201005261949.jpg/)

[crabstick]

watercooled engine mount finished and polished

http://img340.imageshack.us/img340/6536/img00447201005300838.th.jpg (http://img340.imageshack.us/i/img00447201005300838.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

Rails , flotation, rudder bracket, water fittings, motor in, painted.

http://img193.imageshack.us/img193/7174/img00450201005301647.th.jpg (http://img193.imageshack.us/i/img00450201005301647.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

[crabstick]

Hokay, the Epoxy dried... and RAN over night, oh well, it rails are SOLID, and the engine mount has zero flex.

I left the boat in my server room overnight for the paint to harden and its turned out ok, truth be known i was sick to death of sanding and just wanted to paint the sucker so its got a few imperfections..

http://img19.imageshack.us/img19/5353/img00455201005311856.th.jpg (http://img19.imageshack.us/i/img00455201005311856.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

Not really a lot to go now, just gotta order my strut, make a mount and install the steering servo, 440 rod and boot, battery mounts, make a cowl, water lines..

[Brushless55]

Looking good man!

[crabstick]

Ok finally got into pickup my strut.

Its overkill, but hey, our pond gets rough and I need it to take a beating, I have broken struts in the past.

Its an Insane gas sized skeg strut.

Just about to embark on polishing it then will mount..

http://img97.imageshack.us/img97/7865/img00457201006021859.th.jpg (http://img97.imageshack.us/i/img00457201006021859.jpg/)

[Simon.O.]

That is a heavy duty build you have going there Matt. Great for the Wattle Downs rough stuff ! I am a bit of a sissy and wait untill the pond at Pupuke is flat or close.
This NW weather we have is good to run at the Quarry.

I had a yarn to Kim today about you and she told me all sorts of things......just kidding.

When you have that OR powered beast up and running give me a call and we can meet at the Quarry and see how it runs. I am confident now that it will slap my cat !

Shoot me a PM with your mob# or txt me at 021 027 03185

Cheers
Simon.:beerchug:

[crabstick]

Gotta make it strong, with the new wall around the pond the way the cross chop bounces off the walls as opposed to the banks and a few boats in race water or open water it can really chop up, the skeg strut helps also cats track nicely.

I try not to run without a rescue dinghy after loosing a classic shovel with about $800 tied up in it for 2 years at hakanoa, so not so sure on Pupuke. At least wattle I can wade in there.

Strut is now mounted

http://img695.imageshack.us/img695/4877/img00465201006022103.th.jpg (http://img695.imageshack.us/i/img00465201006022103.jpg/)

Just about to make the strut bearing/stuffing tube etc, stuffing tube is annealing on the element as i type

[crabstick]

stuffing tube, and flex installed

http://img28.imageshack.us/img28/9128/img00466201006022300.th.jpg (http://img28.imageshack.us/i/img00466201006022300.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

Prop is a 47mm and it just looks tiny lol

[crabstick]

Will try get home tonight in daylight to take some decent pictures, the camera on my blackberry is absolutely useless under artificial light.

Tonight's tasks are making a servo mount, polishing and mounting it and mounting the rubber boot on the inside of the transom for the steering rod.

I have a way of doing this that works well on my cambell shovel, pics to come tonight

[j.m.]

To find out how many poles the motor has, take the can off and count the number of loops in the wire.

Most high rpm outrunners of this size have at least 24-36 stator slots, but you can wing multiple slots into one phase. Not quite as efficient as a purpose-built stator, but loads cheaper. If you want higher rpm and more poles, you can rewind the motor with thicker wire going around only one stator tooth at a time (what's normally done). You'll need to find magnet wire that's around 16-14Ga though. Or use multiple strands of smaller wires like scorpion does. This is VERY difficult for a first-time-winder though. RCGroups has a lot of info about rewinding motors.


EDIT>> One guy in the HK discussion board says 8 poles. Seems about right...

Jon

[crabstick]

Thanks Jon, shes bolted in the boat now so I think im just going to run it..

Will hopefully test run on sunday at my club pond, Wattle Downs

[j.m.]

Well yeah, it's only a $32 motor...

[crabstick]

exactly! :iagree:

[crabstick]

http://img215.imageshack.us/img215/416/img00470201006031628.th.jpg (http://img215.imageshack.us/i/img00470201006031628.jpg/)

http://img12.imageshack.us/img12/4348/img00469201006031628.th.jpg (http://img12.imageshack.us/i/img00469201006031628.jpg/)

http://img199.imageshack.us/img199/8784/img00468201006031628.th.jpg (http://img199.imageshack.us/i/img00468201006031628.jpg/)

Some pics in natural light... Blackberry sucks donkey dork for pictures but you get the idea... HIHO SILVER!!

[Xfactor]

Cant wait to see it run . u know you will start a turnigy outrunner craze if this motor runs well @ 32 dollars

[crabstick]

It might just start a craze you never know:banana:

http://www.youtube.com/watch?v=SQdy2wNq_OM

Video of the outrunner spinning up, rpms were still climbing when it hit 24000 rpm.

Gotta love the sound of it, that was on low timing, thus the wee stutter at the start

[crabstick]

just noticed that the ESC program doesn't read rpm on spool down once you set the throttle slider to zero

[Xfactor]

Meaning what crab?

[crabstick]

meaning not a lot lol, would have been interesting to watch the spool down rpm

[j.m.]

It sounded like the can spun pretty easily once the throttle was off. Probably because the can has such a high mass compared to a regular inrunner's rotor. The sound of the magnets is awesome though... Sounds much bigger than it is.

[Xfactor]

even if the mass was the same the outrunners mass is so far from the center of rotation changes in the outrunners acceleration require more to start and more to stop. In my opinion the only have more torque in terms of inertail energy but they require more to get there. I think the tru differnce in motors is the weight of the rotors versus the magnetic force created by the windings and magnets.

[Xfactor]

I think the outrunners sucess lies in it simple mechanical design and all the poles they have. Theres just less gap between the magnet pulls on the rotor from pole to pole; plus theyre open where they can breathe.The only reason i feel that some of that torque is negated because the mass is so far out from the center of rotation so everytime you change the acceleration it works harder than an inrunner. I just think the good outweighs the bad in an outrunner. At any given steady rpm an outrunner probably has more torque but with a varying rpm i think the inrunner will win. I think a outrunner may be a better saw motor.In inrunner a better race motor. Just my thoughts.

X

[j.m.]

Just like your idea about the mass being far away from the center, so are the magnets and stator coils.

An outrunner will always have more toque than an inrunner of the same Kv, outside diameter, and stator length.

Jon

[crabstick]

rotating mass for the win!

Anyhoo, Boat is now finished, going to add some straps as well as the bottom velcro to the cells, and finish the cowl, its currently some balsa, soon to have a couple of layers of glass over a foam cockpit and the balsa. hopefully run it tomorrow.

http://img686.imageshack.us/img686/7615/img00477201006051355.th.jpg (http://img686.imageshack.us/i/img00477201006051355.jpg/)
http://img14.imageshack.us/img14/8855/img00476201006051355.th.jpg (http://img14.imageshack.us/i/img00476201006051355.jpg/)

Ended up removing my alloy cross braces in favor of the carbon wall, it runs from rail to rail. Found with the batts up there and the servo,rx batt and rx sitting at the back i had the best COG and the best range of adjustment. As it sits now its exactly on 33%

just waiting for some glue on the cowl to set and hope to glass it tonight.

[Rumdog]

I'd wack that skeg off the strut. You wont need it. Just more drag. These hulls turn like you wouldnt believe!

[Rumdog]

Where is the CG at with the cells way up front?

[crabstick]

COG is exactly 33% i can go back a little or forward a fair bit.

Want this to be a good rough water electric boat.. might race it with the .45 nitro's possibly. Think the skeg will help in race water. I have a speedmaster non skeg strut to try if i need to. Not gonna hack up my nice skeg strut :laugh:

Have owned a couple of sprintcats and yep, they turn pretty well.

[crabstick]

http://img41.imageshack.us/img41/6811/img00483201006060937.th.jpg (http://img41.imageshack.us/i/img00483201006060937.jpg/)
http://img97.imageshack.us/img97/1074/img00480201006060937.th.jpg (http://img97.imageshack.us/i/img00480201006060937.jpg/)

Glassed the cockpit onto the cowl - 2 layers of cloth.

Just finished laying the epoxy and am awaiting it to dry! black marks is carbon dust from my file..

once its dry I will give it a few very thick coats of primer

[Brushless55]

http://img41.imageshack.us/img41/6811/img00483201006060937.th.jpg (http://img41.imageshack.us/i/img00483201006060937.jpg/)
http://img97.imageshack.us/img97/1074/img00480201006060937.th.jpg (http://img97.imageshack.us/i/img00480201006060937.jpg/)

Glassed the cockpit onto the cowl - 2 layers of cloth.

Just finished laying the epoxy and am awaiting it to dry! black marks is carbon dust from my file..

once its dry I will give it a few very thick coats of primer

Sweet!
I'm looking forward to seeing the fininshed cowl on the hull :banana:

[LarrysDrifter]

Why are the rails so long?Is it to stiffen the hull?Your work looks really good so far.

[crabstick]

Thanks Larry,

Yes length of the rails is for stiffness and longevity.

[Jeff Wohlt]

So that is the Hex 120 ESC with the USB programmer? If so, are you able to run a pistol radio with it or not? I like the new USB prgrammer with them but figure they only work with stick radios.

Nice job! I think we are all getting very excited about the OR possibilities! She is singing for sure! How do you beat that for the money?

I have a tiny one on a larger plane and can't believe it pulls the props it does...when I got the motor I laughed and thought no way...damn it is powerful for a 2628 or something like that.

[crabstick]

yep thats the esc, I have only used it on stick radio, when i used to run pistols with non compatible esc's id just remove the spring and make a ratchet, so full forward was kill the motor..

Cheers Jeff, I have just primed the hatch and put it in the server room to dry, it will get a sand and another couple coats of primer then a dash of silver, hopefully the weather is better tomorrow than today for a test

[crabstick]

http://img690.imageshack.us/img690/9916/img00485201006061813.th.jpg (http://img690.imageshack.us/i/img00485201006061813.jpg/)
http://img580.imageshack.us/img580/4456/img00484201006061812.th.jpg (http://img580.imageshack.us/i/img00484201006061812.jpg/)

couple of layers of primer now, just trying to get a nice flat tape down area.

[Simon.O.]

, hopefully the weather is better tomorrow than today for a test
You bet the weather will be better tomorrow, I am back on Duty so it is guarunteed to be fine.



couple of layers of primer now, just trying to get a nice flat tape down area.

I know how you feel tryng to get a nice wide cowl and then get a good tape down lip too.
It looks good and that OR sounds very nice too.

When it is ready bring it up to the Quarry and I'll hold the camera for ya ! :banana:

The "idea" I have for my big cat may now include OR's based on the sound of yours

[crabstick]

Ah i got a video camera and tripod.

Just taped the cowl down for the first time. Its now good enough for a run.
Heading to wattle at some stage tomorrow

http://img22.imageshack.us/img22/5382/img00491201006061946.th.jpg (http://img22.imageshack.us/i/img00491201006061946.jpg/)

http://img686.imageshack.us/img686/2325/img00490201006061944.th.jpg (http://img686.imageshack.us/i/img00490201006061944.jpg/)

im thinking it needs some scoops behind the cockpit too.. might get onto that

[Brushless55]

Looks good Crab!

[crabstick]

thanks dude,

up at 4am as I cant sleep.. wonder if the neighbors will mind the compressor going this early :rofl::buttrock:

[crabstick]

well i got to run the cat today. I must say Jay was spot on with the props, Its going to need some big props to load this sucker up. the 447 it was silly, about 30mph, I had angled the strut down in anticipation of rough weather but its wasn't too bad, so it came back to neutral after the first run, the x 450 about 35, and x452/3 it came alive a bit and was doing about 42-44mph I tried a 1640 but with all that lift it just buried the nose after that we ran out of suitable props as Jason forgot his other prop box, So I thought id call it a successful test with no water in the boat and no breakages. In general its running a bit wet, but I can bring the strut up and move the COG back a wee bit to loosen it up.

I think im going to need a prather 240 - 245 to really get the motor loaded, May look at an x455 too. I love buying props, sharpening and balancing not so much

No video as I left the camera sitting next to the charger

[Xfactor]

next run tho

[crabstick]

looking at a few possible props to get

ABC H2116
ABC H2114
Oct X455/3

[crabstick]

Proof it floats!

http://img40.imageshack.us/img40/1940/p1020238k.th.jpg (http://img40.imageshack.us/i/p1020238k.jpg/)

[Xfactor]

WE want video WE want video.

[Rumdog]

+1 on the vid! Cowl looks good too!

[crabstick]

Will get a video next weekend for you guys, Got to get some props this week as it was pretty unimpressive with the small props.

Thanks Rumdog, lots more sanding to do on it yet to get a smooth finish, might make a mould from it actually.. The blue windscreen was tape with black marker pen for the black bits

few more pics, running very wet as you can see :

http://img341.imageshack.us/img341/8519/p1020250h.th.jpg (http://img341.imageshack.us/i/p1020250h.jpg/)

http://img341.imageshack.us/img341/6971/p1020247m.th.jpg (http://img341.imageshack.us/i/p1020247m.jpg/)

http://img341.imageshack.us/img341/9712/p1020248f.th.jpg (http://img341.imageshack.us/i/p1020248f.jpg/)



Thanks to Blueprint for the pics!

[Xfactor]

Cant you go with the carbon filled k props for testing to save time and money?

[Xfactor]

Its kicking up a rooster ;looking good.

[crabstick]

Cant you go with the carbon filled k props for testing to save time and money?

Cheers dude,

Unfortunately no, They aren't available locally in New Zealand, its takes ages/costs a fair bit to ship stuff from the USA so by the time I got them shipped I could have just bought a couple of copper/stainless ones.

Found a prather 240, but I don't think its quite big enough and 245 looks to be a tad too big..

Off home now! laters!

[DISAR]

Well done, may I ask what were the motor temps?

[crabstick]

no heat gun, warm but by no means hot, I got on and off plane a fair few times and ran a couple of props that were destined not to work.

[crabstick]

Hurrah, got a decent sized wheel for the Sprintcat today, Biggest prop ive ever put on an electric boat

Behold - Prather 240... Its meant to be about 53mm, but as you can see its a tad under 55mm

http://img824.imageshack.us/img824/2033/img00492201006101426.th.jpg (http://img824.imageshack.us/i/img00492201006101426.jpg/)

Uploaded with ImageShack.us (http://imageshack.us)

Now for the non fun part, sharpening and balancing.

[Rumdog]

Sucks even worse doing it on stainless props too!

[crabstick]

Sucks even worse doing it on stainless props too!


Yeah for sure, and my dremel just poo'ed its pants, think the bearings are gone as the rpm's slow down and she gets hot. Bonus is stainless is nice n hard once sharpened. I forgot how nice the casting was on prather props compared to octura though.

[crabstick]

ready for a test this weekend. Biggest prop ive ever put on an electric boat.

prop is on and sharpened, accidentally sliced my finger so can confirm the sharpening worked. :w00t:

http://img820.imageshack.us/img820/2420/img00497201006111941.th.jpg (http://img820.imageshack.us/i/img00497201006111941.jpg/)

[Xfactor]

Video video.

[crabstick]

camera is charged! just gotta get a window in the terrible weather to get a run now!!:smile:

[Simon.O.]

I know how it is with the weather !
Out of interest as far as the OR motor is concerned do you have any major torque roll issues on take off ?
I know that the sprint cat is wider in aspect ratio to my hull but my little cats that have OR motors are a bastwad to take off with due to torque roll.

In all fairness the 9Xl (before it died) would nearly roll the bigger cat on takeoff.

I am just curious how yours goes.

[crabstick]

Going to test tomorrow at wattle, Got this boat, the N2 Shovel and my Gas cat to take to the pond and do some testing, have just made some mods to the N2 and Gas boat along with this boat has got a new bigger prop and strut height and angle. should be a fun test day

I have not noticed any torque roll on take off, though the boat is fairly wide like you say and also pretty long.

[crabstick]

weather was very windy, and no so good, but i got a wee run before I Blew a lipo! I think these cells must have been on the way out for a little bit.. I wondered why one cell took longer to charge last night, i just thought there was a dodgy connection on the balance plug
http://img710.imageshack.us/img710/5528/jvccam125.th.jpg (http://img710.imageshack.us/i/jvccam125.jpg/)


http://www.youtube.com/watch?v=KOCyoMwdtlE

First lap it was going ok, think ive ruined the cells by accidentally storing them charged for a fair while

[ray schrauwen]

Sweet!!

[Brushless55]

weather was very windy, and no so good, but i got a wee run before I Blew a lipo! I think these cells must have been on the way out for a little bit.. I wondered why one cell took longer to charge last night, i just thought there was a dodgy connection on the balance plug
http://img710.imageshack.us/img710/5528/jvccam125.th.jpg (http://img710.imageshack.us/i/jvccam125.jpg/)


http://www.youtube.com/watch?v=KOCyoMwdtlE

First lap it was going ok, think ive ruined the cells by accidentally storing them charged for a fair while

Awesome!
and about storing charged lipos, is that a bad thing? :confused2:

[Xfactor]

Choppy as ever huh? Good run tho.

[crabstick]

Sweet!!

Thanks Ray



Awesome!
and about storing charged lipos, is that a bad thing? :confused2:

Cheers, yeah pretty sure Ive read somewhere that storing them charged for a long period of time is not so good


Choppy as ever huh? Good run tho.

Cheers, Yeah the rest of the lake was real bad, the gas boats took a few dunks also.
Its still not really performing how id like it to, hopefully some new lipos will change that, last time I ran the exploded packs was in my whip on 6s a while ago and it seemed a tad lazy then..
My Birthday next week and the Wife is letting me buy Lipos :tongue_smilie:, I need some for my P setups and for this cat..

Going to try go for 6s2p around 10000mah..

[crabstick]

http://thunderpowerrc.com/PDF/THPSafetyWarnings.pdf
http://www.rcgroups.com/forums/showthread.php?t=403523
http://www.rctoys.com/pr/2007/09/25/lithium-polymer-battery-winter-storage-lipo-care-lipoly/

a few threads on lipo storage, confirms what I was thinking.

[Xfactor]

You can never let them drain to a certain point.

[crabstick]

http://www.youtube.com/watch?v=9kgn5vhOdZQ

Finally got some time to run my new 45-90c Nano Tech cells, Looks like ive still got a bit more prop to go.. this was Propshop 5017. Big quicker and looser than the Prather 240. batteries were just above cold, motor was warm. Had a prior run with teh 240 a min before this.

[crabstick]

Been away from boats for a bit, getting back into it again now, Just awaiting delivery of the 1400kv model of this motor. I think it should go fairly decent then.

[crabstick]

finally put the 1400KV T600 outrunner in the boat and gave it a test run yesterday. I ran the m447 and after about 3 mins of loading and unloading (in the sea which was a bit choppy), full throttle / part throttle run everything was medium warm. Speedwise it was faster than with the propshop 5017, so Im looking forward to some calmer water and working my way up in props! fun times!