Motor Trouble?

[Flying Scotsman]

Trust a Canadian to come up with a probable answer and I have done both series and parallel the wrong way and not only that, I can not understand why my RX is not responding till I realise that I have the wrong TX frequency.

Douggie

[Ub Hauled]

I can not understand why my RX is not responding till I realize that I have the wrong TX frequency.
Douggie

LOL
me too!!!! I have done that before and got all pissed off because something was "failing" on me and then I saw the crystals...

[Greg Schweers]

Either the motor is labeled wrong or it's not getting full throttle. Ten years ago, when were were running AstroFlights and Platts, the props we used on our riggors were V9 47 3-blades, 1750s, 2047s, 1.9s. This season I'll be running a spec riggor, and these will be the props that I'll be trying. The V9 47 was an oval prop long before we used it as a straightline prop. But, if he's just sport-running the boat, yeah, I'd just stick with 4 and 6 series props.

[Apples1]

i thought of the whole series or parralell thing but i have set my ESC cut off to 3.4v (4s) and if i run the batts the other way i cant get it to run at all witch tells me the the lipo cut off is working when it is running 2s not 4s, but its hard to explain it just feels like its lacking power... almost like i am only getting 50% throttle.

I have set the throttle trim to just running a bit (200rpm) or so then back it off one click to not spinning, and when i arm the ESC i do the full forward, full back, neutral, full again sequence, even on a bench test my Bj sounds like its reving harder??

I am one on only 3 electric guys at my club all others are Nitro or gas so no luck with a data logger, might have to bite the bullet anf buy one,....amyone got a second handy one they want to sell and ship to Aus?

Thanks for all the help guys, i really appreciate bouncing ideas off you all!

[EPower]

Hi the loggers are not expensive Andrew at fastelecrics sells them and by using a y cable to your esc it can tell you if you getting full throttle

http://www.fastelectrics.com/eagletree.asp

Cheers Adrian

[Raydee]

I pulled my hair out last season with a 1515 1Y that just wouldn't perform like it should. I had it in and out of the boat so many times my head was spinning. I sent it off to Steve Neu and when I got it back it was night and day. It was either labeled wrong or just bad. I wanted to be 100% certain it was the motor before I shipped it off from now on I will try a new motor before I go insane trying 10 different props and changing ESC's and setting's.

[Apples1]

that sounds like the trouble i am having....the only problem with that is before i got my boat the builder said he tested with this motor.... maybe this is not the case???? wouldnt be the first time a porky had been told in the RC world! this is one of many problems i am having........ enough said.

[Ub Hauled]

Did Randy test it for ya? is the motor from him as well?
I am surprised he has not chimed in yet to tell you what prop he used...
I'd call hm and tell him your problem, if needed send him the motor
and ask him to exchange it.

[Xzessperated]

John,
I can feel your pain after spending so much money to get so little performance.
Here are some early setups I used in Mr. Krabs.

4s M545 Neu 1521 1.5D 88.7 kph
5s M545 Neu 1521 1.5D 96.7 kph
6s M545 Neu 1521 1.5D 106 kph

The M545 is too small for a 4s pack but not a bad speed.

I have run that motor on up to 8s in my Dumas Hawk (not recommended) but everything was cool. Some early results below.....

8s, Graupner CF 45mm = 104 kph
8s, Graupner CF 48mm = 106 kph

The point I am trying to make is that you need a bigger prop. I really do not think that is your only problem because 50kph is so slow. There is no need to go for 5s, 6s or 8s as I experimented with. These days I am going faster on 4s than any of the bigger battery setups. Stick with your 4s and get some bigger props.

[Flying Scotsman]

Paddy, apart from what you mention. There is a problem and the motor seems to be the answer. Was this motor previously abused?
Douggie

[Ub Hauled]

just something I noticed, the motor is not getting hot, nor the ESC and cells.. that leaves very few options to check, low voltage on the cells, small prop OR mislabeled motor. I believe that if there was something wrong with the motor it would be heating up like a "muddah".

[Flying Scotsman]

Agreed, an eagle tree is required to solve the problem

Douggie

[Ub Hauled]

I think he does not have to buy something else to add the the equation, the man is already frustrated and having the Eagle tree will add more wait, work to install and try. I believe that isolating the items on his setup would be easier and quicker.

Take the ESC out and use it on a working boat if it works, it's not the ESC.
Place the motor in the BJ, if it goes faster, it's not the motor.
Try the rigger cells in the BJ, if it works it's not the pack(s)

Make all these changes one by one and you WILL find out where the problem(s) is... do 'em all
since it may be more then one problem.
This way he does not spend more money nor has to wait for the Eagle tree to arrive...

[Fluid]

Jan is right, a data logger is simply not required here. The only warning I'd give is to be careful if you put the 1521 in the BJ with the BJ's ESC - that D motor will heat the ESC up quickly. Just try it for long enough to see if it runs faster, no longer.

A club member was having an issue with a Hydra240 not giving him full throttle, so he went through a complete calibration to his transmitter....and then it worked great. Try doing the complete re-calibration one more time, it's free afterall. Before you do, set the transmitter's throttle endpoints to 'full' in both directions.

I have a 1521/1.5D in my P Sport Hydro and run in the mid-50s with a mild x450 prop and a Hydra240 with low temps on everything, so the combination has much more potential than what the OP is getting.



.

[Flying Scotsman]

Jan and Jay..great advise but a simple purchase of $70 may solve many users dilemmas!