irenaslavo

Hi Gentlemen

Although I’m in gas models long time I go, I would like to try electric boat after a saw some clips in www.e.powerboat.de but my experience about electric boats is zero and I don’t know what could be better mono or cat hull, which motor. ESC are good ect… . I’m looking for 110cm length with fast motor ( really fast) . my budget is 2000 $. During searching I found the attached hull ( 110 cm ) which made by RCMK.... I think this could be a good boat if right hardware, motor ect… installed . I’m living in France and I can order from Europe or USA.

Please any advice will highly appreciated.

ryan_t888

A 43" hull is quite the jump in to FE boating when one does not have any experience. If you still wish to go ahead with it here are a few of the big dollar items to push such a large hull.

4 of these wired for 8s2p http://www3.towerhobbies.com/cgi-bin...?&I=LXRWB0&P=7
1 of these http://www3.towerhobbies.com/cgi-bin...?&I=LXTJH7&P=7
1 of the 1.5Y motor http://www.offshoreelectrics.com/pro...?prod=neu-2215

That should get you around 60mph.

Typically a cat hull will be slightly faster than a mono hull. They both can handle chop well in most cases.

Ryan

irenaslavo

Thanks Ryan for your advise and for the liks your sent me specially www.offshoreelectrics.com .

I believe my budget could fit for hull, hardware, motor and ESC but the most expressive item will be batteries do you think the http://www.offshoreelectrics.com/pro...rod=df-delta41 and http://www.offshoreelectrics.com/pro...?prod=TP-Jolly will need same motor and batteries ?

Another 3 question please…

1- why electric motor are so expensive ? one motor more expensive than modified petrol engine.

2- I can’t understand figures about rpm they mentioned ( winds/rpm: 1.5Y 1020KV) what they mean by this numbers.

3- what could happen if boat flip, all electronics will damage or they are water proof.

Thanks in advance

ryan_t888

- You could knock off 2 packs of batteries by going with only 1P. Some Speed and Reliability will be sacraficed. A smaller prop must be used. As far as motor goes, you should be able to get away with a NEU 1527 around 1000kv on hulls in the high 30's to 40"

1) I always wondered the same thing. Electric motors can turn higher RPM, produce more power in some cases and operate at a much greater efficiency level. Electrics will continue to improve as these latest and greatest motors have only been introduced in the last few years. Gas / Nitro engines have been around forever and there is not all that much room for imrovement. ( Personal Opinion )

2) Different winds produce different kv's. Kv stands for how many revolutions per minute the motor will spin given 1 volt of energy. A 1000kv motor will turn 10 000RPM given 10v. The key here is this is unloaded RPM and will drop 70-80% when under load.

3) The hull is completely sealed unlike gas or nitro hulls. We tape our hatch shut and the hull becomes water proof. If however water does get in, the ESC is water proof, the motor is usually not harmed, and the packs should be dried out. Receivers and servos usually recover after being blow dried with hot air.

Ryan

irenaslavo

Thanks for your support ....I think http://www.offshoreelectrics.com/pro...?prod=TP-Jolly could be a good choice and I saw clip for this hull with the following setup

Motor: Neu 1521/1D
Batts: Two Thunder Power 6S 4500 Mah
prop: GrimRacer L45x68 Lifter
ESC: Jeti spin200

Speed was 64 mph and acceleration was impressive as soon as boat plane but boat takes some time to be flat on water. I think boat is overpowered and this setup is very expensive… do you think the same.

ryan_t888

6s LiPo on a 1521/1D is way too much voltage for that motor. At over 60 000 RPM, magnets can be tossed. Using a lifter prop on a cat type hull will cause it to bounce severely leading to a boat that handles like garbage.

I don't believe this hull is over powered, but I do believe the wrong setup is being used. Wrong motor and wrong prop.

Ryan

irenaslavo

The like is http://www.youtube.com/watch?v=vxDJ1...eature=related , as you will see down, he mentioed setup smae as my post. what is your opinion?

BACKEMF

Nice job, need a bigger pond ...

ryan_t888

Everything I said is happening in that hull. The motor is revving far too much in my opinion. The boat bounces like a kangaroo at slow speeds and continues to bounce at high speed.

The hull looks a lot smaller than I thought it was. I don't know the specs, maybe 85cm? I thought this hull was closer to 40" - 100cm

This is not a setup that you can run for a minute or more. You can only make 2 or 3 passes and the boat must be brought back in - SAW boat.

Ryan

alloutcustom

Handles like a cardboard box with a v8 in it, haha.

ozzie-crawl

i have a boat i think is the same as the video it is a 32" cat .the one in the video is set up poorly . i run a 6xl 2800kv motor on 4s 2p and it gets on plane in a few feet and is very stable at speeds of over 60mph

RC_Bob

Wow, wut prop and esc?

ozzie-crawl

my cat is actully diffrent to that but very similar. speedie is a 200 amp model and prop is 42mm carbon . but iam still playing with props hopfully will get some video this weekend

irenaslavo

Thanks gentlemen for sharing my post but Ryan …. I can’t understand what do you mean by (At over 60 000 RPM, magnets can be tossed) do you mean that engine will rev at 60000 RPM?

And Ozzie what do mean by (i run a 6xl 2800kv motor on 4s 2p) … excuse my ignorance about electric models.

Please… I need advise for the best setup for 100cm boat within my budget 2000 to 2200 $. Maybe my bugject will not be enough to get speedy boat but I can’t run small hull because water in my area is choppy.

ryan_t888

His motor is 2900kv

6s * 2900 = 64 380RPM

Way too much. Motor is good for max 60 000. I would never recommend that setup.

Find a hull around 40" and let us know. Most of these hulls you are looking at take 1/4 of that large budget.

You could get away with running a
NEU 1527
8s or 10s LiPo
HV hydra 180

That would be less than $1500.

Ryan

irenaslavo

Thank ryan, that exactly what I was asking for. I like this hull (http://www.offshoreelectrics.com/pro...rod=df-delta41) but it is 41.5” … I don’t know if it will be O.K with your recommended setup or not… Please advice.

For the motor and ESC, I found in www.offshoreelectrics.com but it seems they don’t sell Lipo … where I can find them and which charger I should order .

Thanks for your support

Silent-AV8R

I get all my lipos from Pat at [link=http://www.rclipos.com]RC Lipos[/link]

Good products, great service, free shipping (not sure about Canada)

irenaslavo

Thanks Silent-AV8R …. I’m leaving in France and I don’t know if Lipo shipped airfreight or not because in tower hobbies they mentioned ( Flammable, cannot be shipped via Air ) I believe I will force to buy them from France where coast will be double USA but the real problem there is no 8 or 10 S batteries in Paris , I checked today with some shops , they have up to 4S -14.8V 3300mAh… I don’t know if I can use 2X4S connected to each other to get 8S or not.

Any help please

ryan_t888

Actually yes, it would be easier to use 2 4s packs or 2 5s packs as they are half the size and can ble place on either side of the hull. I believe PAT ships WORLD WIDE - Free.

You would need 4500mAh 30C minimum or 5000mAh 25C minimum. If you would only be running 1P, your run times will be quite short. Maybe 1.5-3minutes or so with the smaller props having the most run time. Heat in the packs would most likely be the factor to limit run time.

The hull you linked would work with a NEU 1527. They are strong motors.
Neu 1527/2.5D for 8s
Neu 1527/1.5Y for 10s < My recommendation, especially for 1P lipos
A 10s setup has the potential for either longer run times than 8s or faster speeds than 8s. You can't have both, it all depends on the prop used.

Ryan

Silent-AV8R

The 1527/1.5Y will work if you keep the weight down. I burned two of them trying to push an 18.5 pound 44-inch cat. Too much hull for the motor.

However, at 41 inches and maybe 11 pounds it should scream with the 1527/1.5Y.

irenaslavo

Thanks for this valuable information but I think 1.5-3 min. is very short running time... is this normal in electric boats or I can get more time with different setup.

Please another questions:
what is expected speed I will get with Neu 1527/1.5Y and 10S?
what is charging time if I will use quality charger?
can I charge them as soon as they get boat from water or I should leave then until they achieve normal temp.?
can I use many packs one after one other or motor will be damage.