Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: dougal on August 28, 2013, 10:53:49 pm

Title: 0.12 cc nitro - submerged drive. Straight shaft or parallel flexi?
Post by: dougal on August 28, 2013, 10:53:49 pm

On the face of it a straight shaft should offer less friction (more engine power to the prop)...but then some of the propeller thrust is wasted due to the shaft angle. Flexi-drive will create more friction (?) but with the prop parallel to the underside of the hull, it will be more efficient...?
I'm looking for the ideal set-up for a 0.12 Z Class OMRA boat.
With such a small engine, underwater drag/shaft diameter/drivetrain efficiency are crucial.
Any advice/ideas?
 
 

Title: Re: 0.12 cc nitro - submerged drive. Straight shaft or parallel flexi?
Post by: black magic racing on August 28, 2013, 11:41:48 pm

depends on the boat you are going to use :-))

Title: Re: 0.12 cc nitro - submerged drive. Straight shaft or parallel flexi?
Post by: Tombsy on August 29, 2013, 06:08:00 am

I have a .12 in a JAE rigger that does close to 55mph with a flex but's a surface drive.
You might look at Piano wire drive with bearings as an option for your setup as well.


http://http://www.offshoreelectrics.com/products.php?cat=Piano+Wire+Drive+Systems (http://http://www.offshoreelectrics.com/products.php?cat=Piano+Wire+Drive+Systems)