RE: .40-.46 build plans
Here are the plans of the round nose hydro that I have built and tested.
The measurments are for a full scale boat about 8 foot long. The original boat was powered by an outboard motor, so you will have to make some changes to suit your type of build. Measurments are in inches. They are very hard to read . I spent a lot of time trying to read the sizes and scaling them down and converting into metric. It was worth it. The plans were brought by me over the net for $10 , but as freinds I will share them whith you for nothing. Not for the first timer, but you can cut some corners and end up with a boat that will work.
I scaled down by 1/4 to end up with a boat of about 2 foot long or 600mm. I have used an OS .25 to power this build.
SO JUST HAVE FUN WHIH IT.
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_1.jpg]Plan 1 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_2.jpg]Plan 2 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_3.jpg]Plan 3 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_4.jpg]Plan 4 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_5.jpg]Plan 5 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/RC-Boat-Plans/SC_6.jpg]Plan 6 of 6[/link]
[link=http://www.rc-airboats.com/gallery/albums/Roundnose-Hydro/Round_nose_Hydro_oo1.wmv]Test run In My Pool[/link]
With a water rudder this boat runs more stable in a straight line. It can roll over if you turn too hard at speed. I have run this boat with a .46 glow engine on it and it ran well in a straight line, the only thing touching the water was the water rudder. This is mot a conventional Airboat but it is a fun project for the more experienced RC builder.