Neu 1515/1Y ampdraw?

[bjornar]

Hi,

I am building a Mystic 84cm with twin 1515/1Y and am wondering if my Hydra 120 will be powerfull enough? I am planning on starting with Propshop 3514/4.

Regards
Bjørnar

[bjornar]

Anyone have any idea about this?

[D. Newland]

I believe the prop isn't very well known regarding it's amp draw. What cells are you going to use and how are you going to wire them to each motor? Voltage? mAh capacity?

Generally, a Hydra 120 is a little thin for a 1515 1Y. That motor can easily be pushed beyond a 120's limits. However, if your boat is propped correctly, they will work.

If I were to use a pair of 1515 1Y's for a dual project that measured approx 36 inches in length and wanted to use Hydra 120's, I'd use a 40mm or smaller in diameter prop and a 2 blade. Something along the lines of a pair of Octura left and right rotation X442/2 blades and I'd shave them down to 40 mm. Each motor would see 4S and 5000 mAh's.

[bjornar]

I believe the prop isn't very well known regarding it's amp draw. What cells are you going to use and how are you going to wire them to each motor? Voltage? mAh capacity?

Generally, a Hydra 120 is a little thin for a 1515 1Y. That motor can easily be pushed beyond a 120's limits. However, if your boat is propped correctly, they will work.

If I were to use a pair of 1515 1Y's for a dual project that measured approx 36 inches in length and wanted to use Hydra 120's, I'd use a 40mm or smaller in diameter prop and a 2 blade. Something along the lines of a pair of Octura left and right rotation X442/2 blades and I'd shave them down to 40 mm. Each motor would see 4S and 5000 mAh's.

Thanks for answer. I am planning to use 4S about 5000mah. Do you mean how long the wires will be? The Propshop props are 35mm but of course 4 blades. maybe I should start out with a 2 blade? Or maybe try to get more powerfull esc`s.

Why does not people know the propshop props so well? there very nice props:tongue_smilie:

[vvviivvv]

[/QUOTE]
Why does not people know the propshop props so well? there very nice props:tongue_smilie:[/QUOTE]

I know! theres so many of them aswell

[D. Newland]

Is the Mystic a catamaran?

Do you already have all of this gear?

What are your speed and runtime goals?

What's your budget?

[bjornar]

Is the Mystic a catamaran?

Do you already have all of this gear?

What are your speed and runtime goals?

What's your budget?

Yes, MHZ Mystic 84cm is a catamaran.
http://www.mhz-powerboats.com/shop/shop.htm?lade=artikel3786.htm

Yes, I do. But I am concidering if I should get new esc`s, but I prefere not...

To begin its for sportsdriving, but I hope about 50mph and closer to 10min. And maybe try 5S later, but then I should probably get new esc`s first..?

When it comes to budget I really dont have any. I had a lot of the equipment from before (motors, esc`s...) My main goal is to get a nice running cat. But I dont like to pay more than I have to... :P

[D. Newland]

I really don't think your 35 mm props are the way to go with that size of boat. Even the 40 mm 2 bladers I recommended above may be too small for that hull, but having duals will help.

I'll stick with what I recommended above, but shoot for 45 mph and runtime about 3 min 30 seconds with each motor seeing a very good 4S 5000 mAh pack. I think your Castle 120's will be fine if you've got this boat setup and running correctly.

You'll need Castle 240 ESC's if you go with 45mm or 47 mm props, and your runtime will drop to about 2 minutes.

[Ub Hauled]

On that note, I'd recommend using 4s2p...
the hull definitely has the room and could use the extra juice.
35mm props I believe are too small, I'd go with the suggested
442 worked down or even a 445... you'd need a bigger ESC though.
The above suggestions would be based on a 4s2p battery setup, specially
if you want longer run times.

[andym]

1515 1y are a very strong motor and can run a 47mm prop all day long. The size of this hull will need a large prop to move it efficiently and with twins it should rock !! I agree Jan that 4s 2p is the way to go and CC240's would be the goods

[bjornar]

On that note, I'd recommend using 4s2p...
the hull definitely has the room and could use the extra juice.
35mm props I believe are too small, I'd go with the suggested
442 worked down or even a 445... you'd need a bigger ESC though.
The above suggestions would be based on a 4s2p battery setup, specially
if you want longer run times.

Thanks for the feedback. What do you mean about 4s2p?(have to ask to be sure...) typical 2 x Lipo 4s 3000mah+ on each motor? And when it comes to esc`s, what will you recommend? Will there be any news from CC before the summer, thinkin about ICE?

[sailr]

two 1515/1y's only a 33" hull seems like extreme overkill! A single 1515/1Y should push it into the 50mph+ range! BUT, you're going to need a 200+A ESC to be on the safe side.

[bjornar]

two 1515/1y's only a 33" hull seems like extreme overkill! A single 1515/1Y should push it into the 50mph+ range! BUT, you're going to need a 200+A ESC to be on the safe side.

ok, so I should get new esc`s to be on the safe side. I dont want any accidents :P
But I still wonder what esc thats "best for the buck". I feel the Hydra 240 is a litle old, and maybe CC will come with something new very soon. Or maybe I should go for the new from AS.

[Anbjorn]

Bjørnar,
Why dont you try these?
http://mgm-compro.com/index.php?tid=brushless-speed-controllers-for-race-boats-16025-3-race-boat-e-series
Anbjørn

[bjornar]

Bjørnar,
Why dont you try these?
http://mgm-compro.com/index.php?tid=brushless-speed-controllers-for-race-boats-16025-3-race-boat-e-series
Anbjørn

Looks OK, but does anyone have any experience with it? How is it against CC and AS?

[Ub Hauled]

Thanks for the feedback. What do you mean about 4s2p?(have to ask to be sure...) typical 2 x Lipo 4s 3000mah+ on each motor? And when it comes to esc`s, what will you recommend? Will there be any news from CC before the summer, thinkin about ICE?

4s2p means:
two 4s packs in parallel, that way you'd get double amperage for longer run times and smoother power through the ESCs.
I don't know about any new releases coming down the pipes from CC, maybe someone else that's better informed then me could give us the "skinny" on the spring releases. It would be nice if the Water version of ICE came out.
I hear good things about the AS speedos, if they are easier to get and support where you live then it may be a better option since the CC 240 is American.
Also, from all the CC ESCs I've used, the Hydra 240 is the most reliable one, I've had my share of burned ESCs but the 240, it's all around decent.
The MGM ESCs are good as well, I have seen them take great abuse but like any other ESC I have seen them fail w/o a reason (not willing to start up)... just like that.


two 1515/1y's only a 33" hull seems like extreme overkill! A single 1515/1Y should push it into the 50mph+ range! BUT, you're going to need a 200+A ESC to be on the safe side.

What may be overkill to you may not be to him, eye of the beholder...

[vvviivvv]

Are the AS the controllers from modellbau-regler.de?

If they are... You will love them I'm running 1521 1Y with them on propshop 4517/3's amps should be acceptable

[bjornar]

Are the AS the controllers from modellbau-regler.de?

If they are... You will love them I'm running 1521 1Y with them on propshop 4517/3's amps should be acceptable

Sounds good. Its the one`s from modellbau-regler.de. I heard some rumors that they are coming with a new 200A esc very soon. My brother is probably buying them for his 1521, so maybe I just order together with him. Do you know how many amps your setup is pulling?

[bjornar]

[QUOTE=Ub Hauled;151778]4s2p means:
two 4s packs in parallel, that way you'd get double amperage for longer run times and smoother power through the ESCs.
I don't know about any new releases coming down the pipes from CC, maybe someone else that's better informed then me could give us the "skinny" on the spring releases. It would be nice if the Water version of ICE came out.
I hear good things about the AS speedos, if they are easier to get and support where you live then it may be a better option since the CC 240 is American.
Also, from all the CC ESCs I've used, the Hydra 240 is the most reliable one, I've had my share of burned ESCs but the 240, it's all around decent.
The MGM ESCs are good as well, I have seen them take great abuse but like any other ESC I have seen them fail w/o a reason (not willing to start up)... just like that.

Thanks for the information. I still have some more time before the ice is gone here, so I will look a litle further. But the AS looks interesting. And if CC comes with something new that could be of interrest.

[vvviivvv]

Not yet, dont have an eagletree expander yet

[vvviivvv]

yes there is a 200 amp version comming out it's 10 euro more i think


it is a 200 amp version was origionally going to be 170 but after tests 200 http://www.rc-raceboats-world.de/xoshop/product_info.php?pName=as-26170-bl-evolution-ii-p-411&cName=brushlessregler-modellbauregler-c-2_12_30

thinking about it i got annother 150 this week, and micha told me there so busy they have a order for about 68 of them at the moment

[vvviivvv]

i stand corrected,

Hi Liam
You can order now but the controllers are ready at the end of february 2010.
Perhaps in the middle of February but not earlyer.
The Price for the AS26/150BL is 279 Eur and the Price for the new AS26/200BL is 299 Eur.
The shipping is 17 Eur.

Gruß Micha
Modellbau-Regler-Team

(well somehow i managed to get one on the 5th of January :banana:)

[BakedMopar]

So if he went with twins would the 120s still be a bad idea?

[vvviivvv]

Not in my opinion as a hpr 115 cm on twin 8xl's can run 66mph on hydra 120's

[bjornar]

Hmm, ok. So maybe the Hydra 120 will be big enough for this setup? I dont want them to poof. I guess everything depends on the choice of props.

[Unsullied_Spy]

Brushless motors pull amps to make power, the more load you place on them the more amps they draw to build that wattage (volts*amps= watts, hence why high voltage low KV setups pull fewer amps and run more efficiently). How many amps you draw depends entirely on how much load you place on them, but I've seen 1515 1y motors pulling over 200 amps (very briefly) on acceleration in 1/8th scale trucks.

[mickvk]

I agree with previous posts that the 120 is probably light unless you're careful with prop selection. Here is some information that you might want to review... The eagle tree graph is real life data - 6S, 5000MAH, 32" Deltaforce vee, 1515 1Y, Hydra 120 LV, Octura y536 36mm prop. The other two forms shown are theoretical information from FECalc. It went like a raped ape but amp draw was over limit so this is an example of a bad setup :)

[bjornar]

So 2xAS 200A will probably be a good investment? I dont want any plown escs...