RC boat motor/esc/prop question

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I am looking for boat parts for a school project where we have to build a boat (theres a price limit so the cheaper the better), and it has to go fast. I was looking at this brushless motor, 
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8595&Product_Name=2040SL_4800kv_Brushless_Inrunner_(WaterCooled)
(when do you think you'll be getting more in stock?)

would that work with this prop, if not, which one would be good?
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7358&Product_Name=Turnigy_4mm_AquaProp__31x22x14mm.

and this ESC if not, which oen would be good?
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9299&Product_Name=TowerPro_H40A_Brushless_Speed_Controller_

Also that brushless motor says the shaft is 2mm and the prop is 4mm, what would I need to connect them (which shaft, coupling, etc)? Thank you for your help!

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R/C_dude Members Profile Send Private Message Find Members Posts Add to Buddy List Gold (US) USERID: 438850 Bargain Addict! Joined: 18/Feb/2010 Online Status: Offline Posts: 23	Quote Reply Topic: RC boat motor/esc/prop question Posted: 18/Feb/2010 at 6:02am
	I am looking for boat parts for a school project where we have to build a boat (theres a price limit so the cheaper the better), and it has to go fast. I was looking at this brushless motor, http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8595&Product_Name=2040SL_4800kv_Brushless_Inrunner_(WaterCooled) (when do you think you'll be getting more in stock?) would that work with this prop, if not, which one would be good? http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7358&Product_Name=Turnigy_4mm_AquaProp__31x22x14mm. and this ESC if not, which oen would be good? http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9299&Product_Name=TowerPro_H40A_Brushless_Speed_Controller_ Also that brushless motor says the shaft is 2mm and the prop is 4mm, what would I need to connect them (which shaft, coupling, etc)? Thank you for your help!

R/C_dude Members Profile Send Private Message Find Members Posts Add to Buddy List Gold (US) USERID: 438850 Bargain Addict! Joined: 18/Feb/2010 Online Status: Offline Posts: 23	Quote Reply Posted: 18/Feb/2010 at 6:04am
	Also we have to make the hull, would foam or wood be better? And what kind of foam/wood would work best with the items mentioned above?

W3FJW Ron Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (US) USERID: 63218 Forum Admin Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067	Quote Reply Posted: 18/Feb/2010 at 10:08am
	Can't help with the power system, but, carving & sanding foam isn't too much fum (IMO)foam and I prefer balsa/ply cause it's more fun to work with (for me). Whichever you choose it will need a fiberglass covering topside and bottom side. If using foam you'll have to use epoxy resin whereas plain old resin is ok on balsa and less than half the cost of epoxy.
	*Best Regards* I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron

R/C_dude Members Profile Send Private Message Find Members Posts Add to Buddy List Gold (US) USERID: 438850 Bargain Addict! Joined: 18/Feb/2010 Online Status: Offline Posts: 23	Quote Reply Posted: 18/Feb/2010 at 10:45am
	Would the Balsa be strong enough to hold on to the motor? Like not cracking with the screws to hold everything down?

W3FJW Ron Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (US) USERID: 63218 Forum Admin Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067	Quote Reply Posted: 18/Feb/2010 at 11:20am
	That's one place where plywood is used. Transom is another as well as keel and top decking and where ever reinforcement is needed. I'd google "rc boat plans" if you're not familiar with construction methods to see if something shows up that may be similar to your project (which you didn't describe) and could be helpful for you.
	*Best Regards* I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron

R/C_dude Members Profile Send Private Message Find Members Posts Add to Buddy List Gold (US) USERID: 438850 Bargain Addict! Joined: 18/Feb/2010 Online Status: Offline Posts: 23	Quote Reply Posted: 18/Feb/2010 at 11:55am
	Thanks and I already looked for boat plans. The project is pretty much to build a boat to carry an orange around a pond as fast a possible.

W3FJW Ron Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (US) USERID: 63218 Forum Admin Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067	Quote Reply Posted: 18/Feb/2010 at 1:45pm
	Hmmm. Sounds like that would be a good project for a simple deck over two pontoons with an air drive like the Florida air boats..
	*Best Regards* I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron

wchiro Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (US) USERID: 15996 Forum Admin HobbyKing Moderator Joined: 18/Feb/2009 Location: Honolulu Hawaii Online Status: Offline Posts: 1623	Quote Reply Posted: 18/Feb/2010 at 11:19pm
	That's a high kv motor...when using a high kv motor the prop size get smaller just like on an airplane otherwise you'll smoke your ESC or motor or both. Not to mention puff your battery. Just remember that water has more resistance than air so prop size is important. Sorry I can't tell you what size to use.
	For Better Health Visit My Homepage

R/C_dude Members Profile Send Private Message Find Members Posts Add to Buddy List Gold (US) USERID: 438850 Bargain Addict! Joined: 18/Feb/2010 Online Status: Offline Posts: 23	Quote Reply Posted: 19/Feb/2010 at 8:08am
	Thanks W3FJW Ron and wchiro for your responses and trying to help. Should I repost this in another section of the forums to maybe get replies on what I need to connect the motor to the prop and if the ESC and prop are good for that motor?

W3FJW Ron Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (US) USERID: 63218 Forum Admin Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067	Quote Reply Posted: 19/Feb/2010 at 8:15am
	No, this is the right forum. Boat people read this forum so it's the best way to get help. HK doesn't yet sell the parts you need but maybe someone will provide a link for you.
	*Best Regards* I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron