Pete,
Your propeller with a pitch of 78 inches,
and cranking at 2700 rpm, with no slippage, will screw thru the air at 200
mph. If you are going faster, 207-213, your prop is actually producing
lift, or negative slippage.
Bill B
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of CavittP@aol.com
Sent: Friday, September 17, 2010
9:40 AM
To: lml@lancaironline.net
Subject: [LML] Re: In need more
H.P.
Thanks everyone for the input. I
really appreciate your taking the time to answer my post. Some solid
ideas for me to consider.
Probably will first try to resurrect my
LSE Plasma III ignition system but this time use the case mounted flywheel
sensor instead of the original pad mounted one that seemed to be sensitive to
the heat buildup in the area of the accessories. Will also try to
relocate the computer to a more forward location to keep all the leads lengths
to a minimum. I've always run Bendix mags.
Already use gap seals but may change
cowling openings from the 235 configuration to the 320 style. My
CHT's run quite cool, so am certain there is too much cooling drag.
I'm consistently getting 180-185 KTAS (dependent on
temperature) at 2700 RPM (full throttle) at 7,500' & 8,500' MSL with my 150
HP O-320-E2D and Aymar-Demuth 62 X 78 propeller.
With power settings for 170 KTAS, I
have a range of near 1000 NM (6.5 hours) with the 54 gallons of usable
fuel at 8,500'-9,500' MSL (7 hours to dry tanks). Have on several
occasions flown non-stop from San Diego to Seattle and on the way
back as well (that leg was usually 5.5 - 6 hours).
When the time comes for an overhaul will
consider replacing the engine with an O-360 or 390 and will switch to a CS prop
at that time. This is probably what I really need to do, but my engine is
still running great with very little oil consumption.