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Old Aug 27, 2012, 08:07 PM
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United States, AZ, Seligman
Joined Nov 2011
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Please Help with Building 3-Point Hydro From Plans

I have plans are for a 15" hydro. I want to build it 24" to 26". It says the bulkheads and keel are made of 1/8" balsa. I am thinking of making them out of 1/8" plywood and covering it with 1/32" plywood. I want to run somewhere around a 3000kv electric motor and of course make it radio controlled (plans say it's a tether boat). What do you think? Am I building it strong enough? Light enough? Thanks for any input.
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Old Aug 27, 2012, 10:16 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
1,878 Posts
Skin it with 1/32 and then glass it, not sure on a good glass weight, maybe 5-7 ounce.
3000kv would be good on 3S, use the turnigy/seaking 90 or 120 amp ESC. You won't be needing that much but it hardly costs more so go for the extra protection.
What size motor are you planning?
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Old Aug 27, 2012, 11:12 PM
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United States, AZ, Seligman
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Don't know what size motor yet. I am now going to build boat smaller. I am on a very tight budget and just got a 25 amp ESC for the project. So it will now be a motor that will fit that ESC.
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Old Aug 27, 2012, 11:34 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
1,878 Posts
Build it down at ~20" then. You won't be able to run a 24" boat very quickly on 25 amps, even on a 4S setup.
Try to find a 2840 or 2850 motor (something with 28 as the first two) at around 2800-3000kv.
If it's that size, use balsa as the plans reccomend.
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Old Aug 27, 2012, 11:37 PM
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United States, AZ, Seligman
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Quote:
Originally Posted by boaterguy View Post
Build it down at ~20" then. You won't be able to run a 24" boat very quickly on 25 amps, even on a 4S setup.
Try to find a 2840 or 2850 motor (something with 28 as the first two) at around 2800-3000kv.
If it's that size, use balsa as the plans reccomend.
Thanks for the help.
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Old Aug 28, 2012, 06:25 AM
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Canada, ON, Markham
Joined Aug 2008
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I'd go with around 16" and a 450 outrunner or 2040 inrunner to keep amp draw down. You'll want a conservative kv rating so you don't have to run tiny props. Something in the 2500-2700kv range on 3s should be ok with a 30-32mm prop.
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