This summer we completed the sale and installation of two MT 3 blade reversing propellers on LA-4-200 aircraft, one in Alaska and the other one in Toronto.
If anyone wants a Renegade because it sounds smooth you can now have the same effect for a lot less money.  Inside and outside, 3 blades make it sound like a Renegade and 3 blades are smoother from a vibration standpoint.  The installation is simple with no weight change.  
This propeller is exactly what the Lake has been missing all along.
Imagine getting into your Lake while it's nosed up to the shore or dock, getting everyone seated then you start the engine with the reversing switch on the panel selected reverse.  You have a panel light warning you have reverse selected.
When the aircraft is started in reverse the propeller is in bata position, you sit there not moving and allowing the engine to warm up.  When you're ready to leave the shore or dock, lower the water rudder and advance the throttle, the aircraft starts backing away from shore with full rudder directional control. When you're ready to go forward simply select panel switch to forward and you now have a conventional system.
The selection from forward to reverse and back is very responsive.  The propeller in reverse is powerful enough to back the aircraft on land, you just can't control direction.  Take off with a 3 blade propeller has always shown improved acceleration at low speeds and on the Lake with so much of the propeller blanketed by the cowling it's easy to visualize why 3 blades on a 74" propeller will improve performance, at least at slow speeds or getting on the step.
Everyone with a reversing propeller will have to see how fast they can stop on landing.  With this system you can stop right now, land or water.  A little problem with stopping fast on the water while on the step, the reverse thrust kicks up a lot of spray in front of the aircraft.
The system is designed so it won't go into reverse while in flight and controlled by RPM and pitot pressure.
We are offering to accept original propeller and governor on trade when the MT STD'd prop is installed.  The cost of propeller is $16,965.00 USD plus approximately $580.00 USD shipping and installation cost of $550.00 USD.
Standard 3 blade NON REVERSING for LA-4-200 $8,330.00 USD plus shipping, spinner for LA-4-200 $1,050.00 USD (optional) on other than EP.
Standard 3 blade NON REVERSING for LA-250/270 with spinner $10,740.00 USD.

MTV-12-B/LD 188-119a standard non reversing 3 blade LA-200 propeller   $8,330.00 USD
MT spinner mandatory for EP installation but approved for all models $1,050.00 USD.
MTV-9-B/LD 193-109 standard non reversing for LAKE LA-250 and LA-270  $9,650.00 USD.
MT spinner mandatory for LA-250 and LA-270  $1,090.00 USD.

All MT products shown in USD FOB Germany.
MT STC propellers for many makes and models available.