LiPo + brushed 550 motor help

[ScarabChris]

Motors and water jackets ordered from OSE.

Motors, cooling jackets and tubing..........$150.00
Turnigy 120 ESCs and card......................$127.00
Excellent information on the OSE forum....FREE

Blowing the freakin hell out of the lower unit gears on the first run...... Priceless!

[JMSCARD]

I will try and help surf for some in hull pickups in the am for ya...... hobbycity might have had some....but while ordering your motors from OSE get some 5.5mm bullet connectors... you will need them.... or the like.... I like to use 5.5mm bullets on all my connections... batts too... with your low amp draw setup you can use what you are now as long as its not tamiya plugs...lol.... but your motor to esc connections at very least should be bullets... you will need 3 pair of bullets per motor.. so 6 pair total.... alot of the guys here are using EC5 batt connectors now... I use all 5.5mm bullets but they can be dangerous for some.... so stick with your setup battery wise for now if you like but you will need some bullets for the motors.... just wanna make sure you don't get everything and not have any connectors on hand.... good lluck....

If you already made your order with ose...pm steve with your order number and he will ad them to your order and send you an invoice for the extra to be sent via paypal...hes good like that.... not that I've ever had to add stuff after my order was made or anything... :)

[ScarabChris]

I got the water outlets, I need the water intakes for the hull bottom for the ESCs. Damn I forgot to get the bullet connectors. Let me go back, hopefully Steve will combine them with the main order.

[JMSCARD]

yeh he will I edited my last post with what to do... just send him a pm with your order number and what exactly you want to add... he will get it done and send you a invoice for the rest of the money....

[ScarabChris]

OK done! I got 10 pairs of bullet connectors and some silicone wire. All I'm missing is the thru hull water pickups. But I'm heading to bed so I'll track those down tomorrow.

[JMSCARD]

OK done! I got 10 pairs of bullet connectors and some silicone wire. All I'm missing is the thru hull water pickups. But I'm heading to bed so I'll track those down tomorrow.

Nothing like spending $300 bucks on a hobby before going to bed...LOL... good luck on your build I'll be watching to see it come along!

[Make-a-Wake]

You may want to consider these pickups.........transom mounts. Im not sure the hull pickups would work too well since your not gonna be going 35+ mph..................i may be wrong, but its just a gut feeling.

Cant wait for your motor mods! Fill the lowers up with that grease/oil you were talking about.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXGBH4&P=7

[ScarabChris]

Nothing like spending $300 bucks on a hobby before going to bed...LOL... good luck on your build I'll be watching to see it come along!

LOL...yeah tell me about it. But that me, an impulsive buyer. No matter what it is.

You may want to consider these pickups.........transom mounts. Im not sure the hull pickups would work too well since your not gonna be going 35+ mph..................i may be wrong, but its just a gut feeling.

Cant wait for your motor mods! Fill the lowers up with that grease/oil you were talking about.

http://www3.towerhobbies.com/cgi-bin...?&I=LXGBH4&P=7

Problem with the transom mounted pickups is that between the motor bracket and trim tabs there isn't much space left on that transom.

[JMSCARD]

these are basically the same thing but a brass tube..

http://www.offshoreelectrics.com/pro...od=dh-aqub9520

Coudn't you put one in the middle of the tow motors ?? then a Y adapter...? these seem to push alot of water through them.... do you guys think he could use one and a inside the hull Y adapter to cool both motors and esc's? I've had these water pickups on hulls before and they shoot a REAL steady stream....

[ScarabChris]

these are basically the same thing but a brass tube..

http://www.offshoreelectrics.com/pro...od=dh-aqub9520

Coudn't you put one in the middle of the tow motors ?? then a Y adapter...? these seem to push alot of water through them.... do you guys think he could use one and a inside the hull Y adapter to cool both motors and esc's? I've had these water pickups on hulls before and they shoot a REAL steady stream....

I may be able to put one in the center under the bracket and run the hose through the transom. This will only be to cool the ESCs as the motors have their own cooling system.

Once I get the ESCs and figure out their placement I'll be able to tell. With this brushless setup I'm going to put the ESCs right at the transom so the wires to the motors can be short. But the battery cables will need to be long.

This boat should be quite a bit faster. Forgetting for a moment that the brushless motors put out more power. The boat overall is going to shed a lot of weight.

The brushless ESCs are much smaller and lighter than the brushed ESCs. The brushless motors should be lighter than the stock 550s and the LiPo batteries are nearly half the weight of the NiMH.

Once I remove all the brushed components I'm going to weigh it all. Then I will weigh all the brushless components.

The boat weighs in at 10 pounds now with the NiMH batteries. I bet the boat sheds 2 pounds.

[Make-a-Wake]

With the weight reduction and greater power it outta get up nice..............you just dont want it smokin fast as it would take away from the scale effect. 25mph is plenty in my opinion..........

I would try the one large pickup tube as JM mentioned. I just dont think the others will work well..........once again, i have been wrong before. If you are only cooling the esc's you really could just route the single line thru one then the other, you shouldnt be generating too much heat with 540s motors on 3s, and you are running 120a speedos.........plenty big! I bet it works great that way.............plus you could have just the one center mounted pickup that will not disturb water flow to the props.

[ScarabChris]

Agreed.

And getting back to the gears. I am brainstorming on these lower units. I have come up with a way to put a small reservoir in the motor cowling so I can monitor the gear oil level in the case. Instead of that grease being moved out of the way these gears will be continuously submerged in high grade marine gear oil just like the real deal.

That should make the gears last a long time. Plus there are two motors and gear sets sharing the load on a lighter boat.

Should work nicely.

I'll post pics of the gear oil system so others can copy it if needed.

[Make-a-Wake]

The gear oil idea sounds cool, but how will you make the reservoir up there and get it to flow down..........just curious as i have obviously seen the lowers. The vertical drive shaft has bearings on each end as you know, i guess you could assemble the entire prop drive area, then pour the oil down the shaft tube, then put in the first bearing, fill it some more then add the vertical shaft................i dont know, im just thinking out loud as i picture it. Looking forward to seeing how you do it!!

[ScarabChris]

Doing a prop shaft leak test now. It does drip slightly. Filling the gearcase is easy. Just pull the vertical shaft out and pour some oil in.

But yes, I am now seeing that getting the oil from a reservoir down to the gears will be tough. I was hoping to be able to drill a hole in the vertical shaft tunnel and put an oil line to feed oil between the upper and lower bearing. But the oil won't make it past the lower bearing, not with any kind of usable speed anyway.

And I think in order to do an oil bath gear it will need the reservoir due to the poor prop shaft seal. Unless I can seal that better then the reservoir may not be needed. Just pull the motor and shaft every so often to check the level.

I can do without the reservoir and the leaky prop shaft seal but I would have to pull the motors and vertical shafts before every run to top it off. But gear oil leaking into the water doesn't make me happy either. One drop of that stuff makes a slick the size of a dining room table.

[ScarabChris]

Well after letting the gearcase sit upright for a few hours I can see that regular marine gear oil will be to thin. It has leaked out a lot. I think I will try some of that super thick motor honey from the auto parts store.

Of course the seal on this particular propshaft plug could be bad.

But during the leaking there was some good news. The oil does make it past both vertical shaft bearings. The upside will be that a reservoir will be easy to make and all the bearings and gears will be well lubricated.

The downside is the constant leaking. It will make a mess, especially in the water. Maybe I'll name the boat "Deepwater Horizion".