Help me choose motor/esc for this boat

[corsara]

Need some help with the prop. Reading your message---I do have threads on the end of the shaft, but that's just for the end cap. The actual prop doesn't have threads, and is held by what I think you mean by "drive dog". Am I correct to assume I can't use the carbon props in that case?

EDIT:

On the other hand, my 4mm diameter threaded shaft is neither 1/8", nor 3/16", which makes me think that I can actually screw those cheap carbon props to the end? If this is the case, they are cheap enough, I'll be able to buy a few to experiment with.

[corsara]

Furthermore, taking into account the top cover, which opens up some space up, I can fit a 4S battery in there. (160mmx44mmx39mm). It will be a tight fit, and the battery will be more positioned to the center, only slightly more to the port side. But it can be done. Ahh...decisions, decisions.

[tlandauer]

OK, Looks good, the portside depth of 35mm is not bad, two 2s side by side would not leave much room for the servo but I think its OK.
If the shaft is 4mm and with drive dogs, then these will fit:http://www.offshoreelectrics.com/pro...llaneous+Props
Now: Looking at you transom inside the hull, you need to fill the gap at the bottom of the wooden doubler, there is a gap and your trim tabs mounting holed may be half on the wood and half between the wood and the bottom FG floor, that's why earlier I said you need to determine that. I used epoxy mixed with milled epoxy filler to fill these gaps although it was my own build and the gap was much smaller.
http://www3.towerhobbies.com/cgi-bin...12&P=SM---note that OSE carries a micro balloon filler, not the same IMO, you want the milled fiber glass, really strong stuff.
Measurements are very helpful for us to see and help!

Lastly, yes, you can take the drive dog out and screw some cheap CF props to test, the Venom aluminum props are expensive and need to be sharpen and may also need to be checked for balance.

[corsara]

Sounds good. Yes, I see what you mean about the gaps under the transom doubler and the bottom. I'll see that I fill them up if drilling for the tabs is not to hit the wood completely. Thanks for the links.

Regarding prop---I think I'll get a few CF props to test, and once I settle, I'll get an expensive sharpened and balanced prop of the preferred size for the long term.

One problem with the big 36xx motor though: even though I can fit 2 x 2S batteries side by side, or even one 4S battery, I think I might have clearance issues between the motor and the bottom of the boat. From the center of the opening where the motor drive goes, to the bottom---there is 22mm. 36mm/2 = 18mm + thickness of cooling jacket.. I think I'll have to go with the 28xx motor after all, especially if I want to keep this motor mount...

EDIT:

The link for the combo that was posted by Doby earlier: http://www.offshoreelectrics.com/pro...=dh-aqcom-2030 - I search for the water jacket, and it has 1.75 inch outside diameter, which is 44.5mm. So, there is just about enough space to squeeze that in, and it will be resting on the bottom, kind of very tight fit. I wonder what to do... I think I'll go with the 28xx... I can always upgrade later and move the small motor to another smaller boat in the future..

[tlandauer]

Clearance should be a concern, howwever, the motor is tilted up, and the jacket is puched back a few milimeters. The "actual" diameter is somewhat between the motor can and that of the o.d. of the jacket.
Sorry, at work so couldn't verify for you.

Sent from my Droid using Tapatalk 2

[corsara]

Unfortunately, this motor mount is exactly at 90 degrees, which will make the motor horizontal to the bottom. Then there is this coupler connecting the drive to the motor (not sure what it's called, but I'll have to get one appropriate for the motor I choose as this one is 3mm only):

[tlandauer]

I see... yes, this is a "universal joint" coupler. I have yet to use one. Don't know the reason, is the motor mount plate not perpendicular to the stuffing tube? There must me a reason. Guess you need to find a motor with a shaft that is 3mm o.d. What is the 28XX's measurement.
I wonder if the motor shaft does line up with the prop shaft after you install the motor, because it is a pitty not to be able to use the Leopard 28xx motor for the only reason that its shaft is 4mm.

[corsara]

No, unfortunately the motor mount is not perpendicular to the stuffing tube

OSE are out of stock on these universal joints (I need 4mm to 4mm for the 28xx), but I found this: http://www.ebay.ca/itm/GRS-New-Unive...65214cc&_uhb=1 , seems like it would do the trick.

Unfortunately, OSE also just went out of stock on the 120a seaking, also out of stock of the 90a.

I'm trying to put together an order and submit it, and I'll order the 120a seaking and the universal joint separately from somewhere else. Just brainstorming on the props right now.

[corsara]

Any suggestions on prop sizes to start with? they are like $6 / piece (for the CF), I'm thinking about getting 3 of them and try stuff, just don't know which ones are a good start.

[tlandauer]

Forgot to say that you can use this:http://www.offshoreelectrics.com/pro...?prod=ose-1030
If I were you I will have something like 36, 38, 40mm.
I don't think the "S" series is practical, I don't have a conversion chart, but the pitch on those may be too much. Hopefully someone else can help you out here.

[Spartanator]

Just a heads up guys, I received a email from the RMA department at Seaking and they said they will be ditching the Sk180... I have not heard of any plans on anything newer. Forgive me if I don't respond but I usually hang out in other threads.

[tlandauer]

Just a heads up guys, I received a email from the RMA department at Seaking and they said they will be ditching the Sk180... I have not heard of any plans on anything newer. Forgive me if I don't respond but I usually hang out in other threads.

??
Thanks for the heads up though, another ESC bites the dust!

[corsara]

Thanks.

Out of stock on the 36mm and 38mm...

I'll buy 34.5mm, 37.4mm, 39mm, and 40.5mm. Also I'll buy one with 3 blades of size 36mm.

Placing the order in a few mins..

[tlandauer]

Good Luck!
Cheers!

[corsara]

Good Luck!
Cheers!

Thanks bud! Your help is very much appreciated, I learned so much from you while putting together my shopping list! Order placed, yikes, Canadian dollar is so weak nowadays... Can't wait to get the parts!