I know a mechanic who has experience racing mazda engines . He claims that a 2 rotor engine supercharged could exceed 300 HP. I need some confirmation . Let
us consider the need for 300 HP to propell a 3000# max gross seaplane of conventional pusher prop design. Cost is a factor but below $15,000 for the engine ,
it's not a factor .  Of course weight is a major factor . Would one pursue a 2 rotor plan with supercharger or a 3 rotor plan naturally aspirated ? OR ? Prop

will probably approximate 6' dia. 3 blade and have a max RPM of 2500 . Should be variable pitch regardless of cost . Length of the engine may be a factor -
not sure . OK let me confess . I would like to start with a Spencer Air Car configuration with a composite hull and modern wing with an additional station in
the hull fwd of the wing for longitudinal balance . I'm contemplating many mods ; retraction of gear into wing , step in hull, stabilator . Once I rough up my
concept I will go to aero engineer for concept proof/feasibility. the size, weight, cost of engine are important factors .At this point I choose to call my
project "pipe dream". FCM

A sea plane is a heavy duty use. 300 HP turbo two rotor is no problem for takeoff
duration but we have no history for that amount of climb power. Ken Welter
uses nitrous oxide with a 200 HP 13B two rotor for getting up on the step
(300 HP) for his 3000 pound Coot. 

I think a 3 rotor NA would give you more margin for error. Both would be about
the same installed weight.

Use a 2.85 to one PSRU (Tracy Crook)  and about 7200 engine RPM for takeoff. 

Paul Lamar
 
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