Mirrored/reversed Pitch Propeller?

[powerwindows83]

I didn't see anything like this online anywhere so here goes: are there any mirrored/reversed pitch versions of standard Lego propellers out there or do I have to make my own?

I've been building motorized boats recently to test propulsion methods, and the best small scale prop I've tested so far is the small 3-bladed prop (6041) placed on both sides of a technic cylinder (41531). I've been using the 40x20x7 hull since it's the only one I currently have that floats. https://imgur.com/a/JEUlSLY

The problem with this setup and single-prop designs is that since they spin the same direction they turn the boat quite significantly. When launching from a standstill the force on the aft end is almost 45* from straight. This brings me to the question in the title: is there any third party source that makes Lego propellers but with mirrored pitch so I can make a counter-rotating design, or will I have to do some cutting and gluing on my own? Google is beyond useless with specifics as we know 

Thanks!

[1963maniac]

Most outboard motors or inboard/ outboard units have a small little rudder type fin on them to correct for the pitch of the propeller. And yes, a counter spinning prop also fixes that problem. 45* is a lot to correct.