> >
> > > > Interesting page, Where can I get more information on using rotary
> > > > engines in aircraft and cars. I am building a lotus 7 replica
that I
> > > > want to have 500 reliable hp out of. Also I am building an aircraft
> > > > that I want to create as a ducted fan aircraft. This takes lots
> of HP.
> > > >
> > > > DB
> > > >
> > > > 400 HP normally aspirated is no problem for a 3 rotor at 10,000
RPM.
> > > >
> > > > 400 HP turbo charged is no problem for a 2 rotor but everything
> > > > must be right as it is more sensitive to mixture and boost.
> > > >
> > > > Ducted fans are horribly inefficient in the 100 to 200 MPH speed
> range.
> > > > My guess on top speed with 400 HP would be well under 200 MPH.
> > > > Of course there would be lots of fuel burn on the order of 200
pounds
> > > > per hour or 32 gallons an hour. Those that have tried have gone
> back to
> > > > props.
> > > >
> > > > Paul Lamar
> > >
> > > Thanks for the data. Yes I agree with the problems of the duct fan.
> > > But there has got to be a way to make that work. The jets do it and
> > > with enough power a piston engine could too. (my thoughts) perhaps a
> > > better thing to do would ba a shrouded fan similar to the RFB
> Fantrainer.
> > >
> > > David
> > >
> >
> >
> > Jet airliners are going further and further from requiring ducts on
> > their turbines. The latest Pratt and Whitney engines run a gear
> > reduction on the bypass stage (making it turn slower) and are seeing
> > double-digit improvements in fuel economy. A turboprop is even better
> > for efficiency. The only benefit provided by the duct is increasing
> > the efficiency of a fan for which you don't have enough room for
> > adequate diameter and/or when you don't want to gear down the fan
> > section to control fan tip speed (trans/super-sonic losses).
> >
> >
> > Regards,
> >
> > Matt-
>
>
> Exactly. So if this issue is not over come then the propeller is still
> the best option for homebuilts
> David
>
> BTW David, you are not a relative of Dale are you?
>
> Paul Lamar


No, I dont think so.

David

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