Today's Message Index:
----------------------
1. 02:57 PM - Hartzell Blended Foil (Craymondw@aol.com)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Hartzell Blended Foil |
Sunday we flew our Glasair2S FT 200 HP Lyc again with our new Hartzell
Blended foil prop and noted the following: We flew in Moderate Chop , 75
degrees OAT and with five mile visibility in moisture laden air. For the third
time, we noted a less than a five hundred foot take off roll at 2600 rpm. We
hadn't yet adjusted the prop pitch stop to 2750 rpm and feel that both
roll out and climb performance will increase once we make that adjustment. On
this flight, rather than tell LISTERS that we noted better climb
performance, we decided to jot down the numbers.
With a 1,690 pound gross weight and after departing our air port and
retracting the flaps we pulled the nose up to an indicated airspeed of 90 mph,
2600 rpm and full rich and recorded a 2,000 foot per minute rate of climb
through 1,000 feet above sea level from our home base field that is 725 feet
above sea level. Upon reaching 1,200 feet we noted at 90 mph we still had
a 2,000 FPM climb rate to 1,500 feet above sea level using the same power
settings. While climbing through 1,800 feet we increased our indicated air
speed by lowering the nose to 140 mph and reduced the rpm to 2400 and our
climb rate dropped down to 1,000 FPM. Our cylinder head temperature never
exceeded 330 degrees.
We climbed at 1,000 foot per minute @2400 rpm until we reached
6,500 feet and our oil temperature peaked at 212 degrees and once established
in cruise our oil temperature dropped to 190 degrees. Our altitude was
only 1,000 feet higher than it was on our last flight and averaged 7,000 feet
and because of rough air our ground speed averaged 205 mph and was 10 mph
less than it was on our last flight.
In years past I used to reduce the power after take off with the
throttle in an effort to keep our oil temperatures down. That was until I learned
that Bendix fuel injection systems have a throttle body jet that keeps
the cylinders cool under full throttle and to reduce power by reducing RPM!!
Once I employed that method, that ended hot oil temperatures on climb out.
I also once belonged to a Gruman Tiger flying club that would sometimes
burn out jugs until Grumman issued a notice advising to not have long
sustained steep climb outs. To avoid that, we use a cruise climb speed of 160
mph
on our Glasair that not only provides for better cooling but better fuel
economy and performance. When my son flew piston engine planes his company had
a policy of not reducing power more than 3 inches for several minutes at a
time to avoid shock cooling and we use that method when coming out of
altitude for landings.
Chuck Raymond
N16CD
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|