Current Status

We currently produce normally aspirated propulsion systems from 350 to 500 horsepower.

Currently there are nine converted Republic Seabees flying and two more under conversion. We have installed one V-8 in a Murphy Super Rebel and there are two Skymasters currently undergoing modification. Together they have accumulated approximately 4000 hours. The highest time V-8 Seabee is my own airplane, C-FILM. It has accumulated over 2000 hours. The longest trip has been from Balsam Lake to Key West Florida and return. We use whatever fuel is available, automotive or aviation. The aircraft continues to perform flawlessly. We have flown the aircraft from sea to level to 10,000 ft., and in temperatures ranging from -20°F to 113°F.

From a pilot's perspective, the performance and range improvement is spectacular. From a passenger's perspective, the heating and air-conditioning systems are welcome additions. From an owner's perspective, the 50% reduction in operating costs allows me to do more of what I love - flying!


We flew the original installation 2098 hours in the period from 4 July 4, 2000 to Dec 23, 2011.

During that time the aircraft performed far above my expectations. The engine and PSRU (Propeller Speed Reduction Unit) was performing well when it was removed. We removed it because my system was becoming dated. My SeaBee (C-FILM) was the first V8 conversion done. It was running an LS1 General Motors® Corvette engine with a manual throttle standard Seabee Hartzell® 3 blade propeller and our 1.68:1 reduction ratio. Most of my customers use the 1.98:1 ratio with an electric throttle. It had a conventional (dated) panel and was in need of some upgrading. We refurbished C-FILM with many improvements including a new General Motors® LS3 Corvette® engine, sporting a modified Edelbrock® supercharger (as seen in the image on this page), a new design single leaver control system that combines throttle, pitch, reverse & supercharger control functions in one unit, and a new design data link that allows the engine data to be sent directly from the engine control unit to the new MGL® IEFIS (Electronic Flight Information System) based panel. The data link avoids the hassle of wiring in engine sensors and has the benefit of letting the pilot monitor the actual General Motors® engine sensors that control the engine. We were back in the air 14 Jan 2014 and now have 99 hours on the new installation. I am really happy with the  performance of the new engine and associated systems.
I am sure C-FILM is one of most highly modified SeaBee ever flown.

I have not documented any performance numbers. For them to mean anything I would have to calibrate all the instruments & standardize the data. Sufficient to say, I have flown C-FILM in side by side comparisons with many Seabees, and none of them have come close to matching the performance. The LS3 is a noticeable improvement over the LS1. I have only flown the new engine to 10,000’ but was able to still pull 30” HG. Eventually, I will obtain an oxygen system and explore the higher elevations.

These days my focus has shifted from the Seabee to trying to raise capital to build the prototype of our new Horizon X2 - the first amphibian you can land on the water with the wheels down without hurting yourself!


The list of C-FILM's modifications are as follows:




Power plant

- 425 HP LS3 General Motors Corvette® engine complete  with 1.98:1 reduction unit
- New motor mount system
- Modified Edelbrock® supercharger
- Custom designed supercharger controller used to normalize the engine under a wide range of conditions
- Electric backup water pump
- 5 blade MT® propeller (see image below)
- New Modified Spinner (see image below)
- Independent dual electric fuel pumps complete with dual fuel pickups, water separators and filters
- Custom designed dual exhaust/muffler system
- Redesigned top cowling hinge system
C-FILM's New MT 5 Blade Propeller And New Design Spinner
C-FILM's "Gull Wing" door modification

- Large baggage compartment door system
- Enlarged baggage compartment
- Gull wing doors (see image above)
- Flush mounted windows
- 3 point retractable seat belts
- Dual battery system
- New design tailwheel unlocking system
- Remote battery charging ports to allow charging main batteries without opening battery box
- New access panel for tail wheel maintenance access
- New access panel for water rudder maintenance
- Fuselage skin reinforcement under elevators
- Wide spray rails
- Cabin heating system complete with windshield defroster
- Cabin air conditioning system
- Cabin fresh air system
- Baggage compartment fresh air vent system
- Flush fuel door complete with remote mounted opener (can only be opened from inside of aircraft)
- Hull boosters
C-FILM's New Glass Instrument Panel (2014)


Instrument Panel

New glass instrument panel complete with:

- MGL® IEFIS (Electronic Flight Information System)® (see image above)
- Dual MGL® communication radios
- Vertical power electronic breaker/power monitoring system
- iPAD® installation complete with adjustable iPAD® holder. The iPAD® can display engine and limited flight data as well as provide backup navigation system
- Wireless engine data recorder
- CANbus data system for displaying engine computer data directly on IEFIS (instead of using secondary hard wired sensors)
- USB and auxiliary power ports
- 4 port intercom system
- External static system
- 3 axis autopilot
- Instrument panel mounted on an angle for an enhanced, ergonomic view for the pilot
- Video camera system. One camera for engine start and one camera for backing up
- Single leaver power management system combines throttle, pitch and reverse controls into one unit

C-FILM's Modified Reinforced Tailwheel Assembly


Landing Gear

- 8.50 X 10 Tundra tires (see image below)
- Upgraded Disk brake system
- Electric hydraulic system complete with manual backup protected by isolating valves & retraction/extension controlled by panel mounted electric landing gear switch
- Redesigned internal oleo components for improved crosswind performance
- Hydraulic tailwheel shock absorber (see image below)
- Redesigned tailwheel fork (see image above)
- Redesigned tailwheel collar (see image above)
- Modified tailwheel axel to allow use of standard tow bar
- Reinforced linkage on center weldment
- Upgraded wheel bearing seals
- Quick disconnect landing gear system

C-FILM's Tundra Tires
Hydraulic Tailwheel Shock Absorber
- Electric elevator trim system
- Electric flap system
- New design water rudder for improved turning ability in windy conditions (see image below)
- Redesigned rudder post system
- New design rudder stops
- Pilot accessible Rudder lock for ground parking in windy conditions
- Extended ailerons
- Drooped aileron system (see image below)
- 2’ 9” wing extensions
- Wing root fences
- Wing tip "splates" (Wingtip fences)
- Redesigned vent system for fuel tank compartment
- Hydraulic retractable wheel skis
- Custom designed wheel ski for tailwheel
- New design Stainless steel fuel level sensor
- New design stainless steel fuel drain system
- Strobes
- Raised rear seats
- Electric bilge pump system

New Design Water Rudder
C-FILM's Drooped Ailerons



We are proud to endorse and utilize the following manufacturer's high quality products for our aircraft modifications:







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