Motor question for my proboat Blackjack 29

[tlandauer]

Ok, to late I just bought the 4082 :-( any one having this motor on the blackjack 29?

Relax, the motor is long, and the inner lid doesn't really fit, I have a Leopard 4082, 2200kv in my MG, the way to do this is if you can get a heat gun, try to apply heat to the front of the motor bubble on the lid, when it gets a bit soft, use you fingers to push the front out more, so you will have that little clearance, now, don't apply too much heat or you will warp/damage the lid. Use your common sense when doing it.
Another way is to shorten the motor shaft, Leopard Motor shaft is 20mm long, MUCH longer than stock shaft, part of the reason why everybody feels the need to have rear support is that NOT only the motor can is long, but the long shaft pushes the motor mount to the extreme, part of the motor mount is no longer seated on the wooden platform----unless Proboat has changed the internal set up, on my MG it was very much the case, I did build a rear support for the motor after I crashed the boat and split the joint seam.
Regarding run time, with Leopard 4082/2200kv and m445, I think the only reasonable set up is 4s2p. To use two 4s, 5000mha lipo, I had to struggle a little to shove them in on the stock battery platform, they were knocked loose after the blow-over and I replaced them with my own design which seats lower and gives more room, basically just two strips or wood, longer for more COG adjustment.
I get decent run time ( more than 6 min.) BUT, first time out, do not exceed 2 min., bring her in to check temp. My 7 min. plus run got all my capacitors bulged ( Seaking 180a ESC) , I replaced them and no problem, but really watch out for temp.

[jsturess]

Sorry dont understand :-) Did you use two 2s lipo in parallel (5000mha)?

Which version did you have of the seaking?

Did you change the shaft also?

Do you have pictures of the setup?

Sorry for the all rookie questions :-)

Regards Johan

[tlandauer]

I use two 4s in parallel, voltage is 14.8 total, but I get 10,000 mha so run time is longer and the batteries last longer, they don't have to work as hard. The Leopart 4082/2200kv is best to run with4s2p. I have the 2nd. Version of the Seaking.
I did buy an OSE up grade cable/shaft.
I will see if I can post some pic. later today, i need to get some sleep, lol...
Cheers!

[lenny]

Hear try this out to. http://www.offshoreelectrics.com/conversion.htm
Also some tips,http://www.offshoreelectrics.com/info.php

The motor may be the same other than all out torque and mass,
I think more run time will depend on what mah cells you use and also if run in parallel or Series.
And also prop size will make a difference in the run time to.

[jsturess]

ok

I will try to cancel my motor order, this is going to be to expansive for me, I have recently bought 6 pcs 2s lipos (4 ace 5000 mha and 2 dinogy 6000mha) and I dont want to buy more lipos. 3 min. runtime is to short!

Does the 4074 also demand 4s2p?

This is so typical me, buy first, then investigat :-)

Regards Johan

[Jason4636]

On which motor would give you more run time. Thats very hard to say, if you had the boat setup perfect on both engines. I would say the 4074 would give you slightly longer run times. The 4082 is bigger and should pull some more amps. I might be wrong in my way of thinking

I always run my 4074 on 4s2p.

[lenny]

Yes, On the 4074.
But how fast do you want the boat to go ?
May be a 3s setup could work for you with a little better run time but less speeds.

[Jason4636]

Lenny, wouldn't going to 3s cause more heat? lower voltage = more amps + more heat?

[lenny]

I think it depends on the rpm it will be running,
And instead of using a 180a esc go with a 120a esc could save a little their to.

[Jason4636]

I agree that the 120 is cheaper than the 180. For the same prop, wouldn't the 3s setup pull more amps than a 4s setup. So wouldn't you need a bigger esc? Granted you could prop way down to run 3s. But what would be the benifit for buying a new motor?

[lenny]

I have no idea what he is trying to do now,
He wants high speed and long run times and cheap to boot.
The stock 1800kv motor that came with the boat, Is it still good ?

[jsturess]

The boat havent seen water yet. I understand that all this sounds strange....but that's the way I am :-)

The original motor is a 1800k.
I thought it was easy to make the boat go faster, by only changing the engine, the esc and keeping the same lipo setup.
Of course I understood that it meant less runtime, but not halving the runtime.

lesson learned.

[lenny]

Well you could go 5s and go with a 120a esc and have more speed and run time,
You just need to go with a small prop first and see what it can handle.
Than work your way up some.
If you want a good cheap motor to run with low kv on 4s to 6s this would do the job.http://www.hobbyking.com/hobbyking/s..._Inrunner.html

[lenny]

What is fast to you ?
Have you looked at any video of boats running and said that looks like good speeds for me ?
If so where and do you have a link ?


strange....but that's the way I am :-)

[Jason4636]

I agree with the 120a on 5s, but for $20 more and the added head room on Amps. I'd go with the 180amp, then you can run a slightly bigger prop, to run faster. But the bigger the prop, the shorter the run time will be