7ECA POH
- Thread starter tony cote
- Start date
Robert Szego
New member
Tony: None was ever published. The engine installation is documented in both the Parts and Service Manuals, and there was a one-page specification sheet in each airplane delivered, but no performance specs. Most people estimate you lose about 75-100 fpm in climb, maybe 5 mph cruise, and 2 gph savings in fuel over the Lyc. O-235.
RS
RS
Robert thanks for the feedback. The one page sheet that I have is from Champion Aircraft Corporation 1964, and list specifications & some performance data.
What I am trying to find out is the power setting (RPM) that I should be running in cruise. The performance data states cruise speed as 107 MPH @ 75%/7500. I typically operate 2550 RPM (max speed 2750 RPM) in cruise which gets me 100 MPH (3000 - 4000 FT). Does this seem right?
Tony
What I am trying to find out is the power setting (RPM) that I should be running in cruise. The performance data states cruise speed as 107 MPH @ 75%/7500. I typically operate 2550 RPM (max speed 2750 RPM) in cruise which gets me 100 MPH (3000 - 4000 FT). Does this seem right?
Tony
andy@lyme.com
New member
Robert, I'm looking to fly down your way headed to fwn) with my 7AC on skis maybe this Friday/Saturday, what are the snow conditions like and where are you based?
You may reply directly to andy@lyme.com as to not bother the rest of the wingnuts with this.
You may reply directly to andy@lyme.com as to not bother the rest of the wingnuts with this.
Robert Szego
New member
I think that's pretty good, although my experience has shown great variance between like airplanes.
My 7GCAA w/150 hp does 115 mph (100kts.) at low altitudes running 2500-2550 rpm. My tach has been checked and is correct; airspeed indication is via Loran readouts over many years, so I think it's pretty accurate.
Back in the 1970s, I flew a 7GCAA that gave me 120-125 mph, but, of course that was checked by two-way runs timed manually. Our 1975 Decathlon 150-CS was consistently giving 140 mph! I have had many inquiries as to why their Decathlons are only getting 120-125. Keep in mind that these were 25 year younger airplanes and the pilot's weight was considerably less too
RS
My 7GCAA w/150 hp does 115 mph (100kts.) at low altitudes running 2500-2550 rpm. My tach has been checked and is correct; airspeed indication is via Loran readouts over many years, so I think it's pretty accurate.
Back in the 1970s, I flew a 7GCAA that gave me 120-125 mph, but, of course that was checked by two-way runs timed manually. Our 1975 Decathlon 150-CS was consistently giving 140 mph! I have had many inquiries as to why their Decathlons are only getting 120-125. Keep in mind that these were 25 year younger airplanes and the pilot's weight was considerably less too
RS
tony
My experience with my 65 citrabra is 2350 solo or 2400 duel at 2000 feet gives me 85 mph and 5_1/2 to 6 gal per hr. An increase to 2450 or 2500 only gains about 4 or 5 mph and the fuel jumps to 7-1/2 to 8 gal per hr. 2550 takes almost full power with the prop that I am using.
My experience with my 65 citrabra is 2350 solo or 2400 duel at 2000 feet gives me 85 mph and 5_1/2 to 6 gal per hr. An increase to 2450 or 2500 only gains about 4 or 5 mph and the fuel jumps to 7-1/2 to 8 gal per hr. 2550 takes almost full power with the prop that I am using.