Author: "Scott" <scott@...> Time: Tue Jan 15, 2002 4:04 pm PST Link
Anyone have anything new on John Farra's Subaru RV9? Performance Specs etc...?
Scott
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Author: eaainc@... Time: Tue Jan 15, 2002 5:52 pm PST Link
In a message dated 1/15/02 4:08:36 PM Pacific Standard Time,
scott@s... writes:
> Anyone have anything new on John Farra's Subaru RV9? Performance Specs
> etc...?
>
> Scott
John is now developing the power he needs to get the RV performance.
This is what we have found so far:
He started flying with 3500 static engine RPM. (1925 propeller RPM) The
airplane flew great and the first few hours were flown this way. The ground
adjustable Warp Drive 72" Taper Tip propeller was set at 17 degrees. Max
possible RPM in flight was 3850 with a fuel burn of 5.0 GPH. The RPM and
fuel burn indicate 54% power or 88 HP. The cruising speed was 150 MPH true.
No gear-leg farings or wheel pants were installed.
The prototype 160 HP RV9 produced 88 HP @ 55% with a speed of 166 MPH. And
the 118 HP prototype flew at 164 MPH @ 75% and again 88 HP.
This would indicate the total drag penalty in MPH of not installing the gear
farings to be 16 MPH.
RV9 Data:
Solo Weight 1300 lbs
Gross Weight 1600 lbs 1675 lbs 1750 lbs
Engine (horsepower) 118 hp 135 hp* 160 hp**
___________________ ________ ________ ________
Speed - Solo Weight
Top Speed 171 mph 178 mph 195 mph
Cruise [75% @ 8000 ft] 165 mph 173 mph 187 mph
Cruise [55% @ 8000 ft] 149 mph 156 mph 165 mph
Stall Speed 43 mph 43 mph 44 mph
Speed - Gross Weight
Top Speed 170 mph 176 mph 194 mph
Cruise [75% @ 8000 ft] 164 mph 172 mph 186 mph
Cruise [55% @ 8000 ft] 148 mph 155 mph 166 mph
Stall Speed 47 mph 48 mph 49 mph
Ground Performance - Solo Weight
Takeoff Distance 350 ft 300 ft 250 ft
Landing Distance 250 ft 275 ft 300 ft
Ground Performance - Gross Weight
Takeoff Distance 525 ft 475 ft 400 ft
Landing Distance 375 ft 410 ft 450 ft
Climb/Ceiling - Solo Weight
Rate of Climb 1,150 fpm 1,400 fpm 1,700 fpm
Ceiling 17,000 ft 20,000 ft 24,000 ft
Climb/Ceiling - Gross Weight
Rate of Climb 950 fpm 1,100 fpm 1,300 fpm
Ceiling 14,000 ft 15,500 ft 18,500 ft
Range
Range [75% @ 8000 ft] 900 sm 785 sm 730 sm
Range [55% @ 8000 ft] 1,100 sm 960 sm 890 sm
The next few flights were with a pitch reduction of 1 degree. Max inflight
RPM went to 4000, 6.0 GPH and 65% or 107HP. Performance was up by 10 MPH.
The pitch was further reduced to 15 degrees and John is now able to get the
RPM and fuel flow up to 78% or about 135 HP in cruise. (4400 RPM and 7.2
GPH) I don't have a report on performance at this new setting. The next step
is to install wheel pants and to go back up to 17 or 18 degrees of pitch with
a 68" propeller. This will increase the top end substantially.
Charlie Walker just sent me some emails. He has a Subaru Glastar. He is
able to use the available power from the engine due to his new Quinti
constant speed propeller.
This afternoon I did a solo take off with half tanks at full flaps. The
temp. was 41 deg. and 10 kts. down the runway, take off was 4 seconds!!! At
100 ft. I went to half flaps and climbed at 75 mph at 1500 ft/min!! The
prop is silky smooth. I'm waiting for version 5 for the Flyspeed and I'll
let you know what it does for the operation of the Quinti.
At 8000 ft. and 22.2 MAP, 8.1 GPH, 4300 rpm (max torque) our true airspeed
was
148 mph.
Charlie
Lopez Island division of Quinti R & D :-)
A glastar's empty weight is 1300 LB, the Subaru RV9's is 1050. The climb
rate should be great :) 148 MPH is very fast for a Glastar.
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