hi guys

i am a subaru guy discovering the rotary world

i am interested in a turbo engine  that will

provide

some 180 to 200 hp what year model would be the

best

choice

i was told that rotary consumption is a bit high

any

one has some number on that

Claude
rv7a fuselage

The 1990 1991 single turbo engine would be ideal.
200 HP is stock but
250 HP could be easily obtained.  You could add a
turbo to just about
any year. Anything after 1993 and up would be ideal
for an after
market turbo. These engines were built in Japan up
until 2003. 250 to
280 HP was stock but 300 HP would be about right for
takeoff. As much
as 800 HP is obtainable for racing purposes. Say at
Reno.

Speaking of racing I hope we get some more entries
in the Sun 100 race
this
year. There is still $500 in the Everett Hatch
Memorial Prize Fund for
anybody
powered with a rotary (in an airplane:)) exceeding
220 MPH in a
sanctioned 100 mile cross country race. Tracy Crook
went 209 MPH last
year and won $500.
This year the required minimum speed increased.

Paul Lamar

c denoncourt wrote:

thank Paul for those info

about fuel consumption , for 200hp single turbo do u
have some ball park number

Claude
rv7a fuselage-- 

I am guessing here. I would figure on about .5 pounds of fuel per HP
per hour or BSFC. That means if you cruise your turbo 13B at 200 hp it
is going to burn 100 pounds of fuel per hour or about 16.6 gallons an
hour. If you cruise it at 150 HP it will be 75 pounds per hour or 12.5
gallons per hour. Tracy reports .47 BSFC normally aspirated leaned out
at altitude. My guess is he is cruising it at around 125 HP so he
would be burning  59 pounds per hour or 9.8 gallons an hour.

The RX8 engine should do a bit better. For historical reference I have
this chart of other liquid cooled engines from the book Vee's for
Victory so you can compare BSFCs. On average the current rotary is
only slightly worse than your average liquid cooled aircraft engine.
The only engines that are significantly better than the average are
the hot running Continental Voyager engine and the turbo compound
engine both under .4 BSFC. In that case 125 HP level would give a fuel
burn of about 50 pounds per hour or 8.3 gallons an hour. If you see
some one claiming  4 gallons an hour or 24 pounds of fuel per hour the
engine is generating right around 50 HP assuming an average BSFC of
.45. Assuming it is a miracle engine and the BSFC is a remarkable .4
the HP level would then be 60 HP.

Paul Lamar
 
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