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Glad to hear the news of more flight time,
Jason
Temps are not drastically out of line with what I would
see on a 90F+ day. But, so long as my oil stays below 200F and coolant
below 220F and decreases after I pull back on power after level off, I am
content. If your cowl is bulging then you clearly have positive pressure
inside the cowl and you may need more exit area.
But, that being said you will always have a bit of positive pressure as you are
slowing the air down in the cowl.
I also have a 74x88 prop with the 2.85 and my static is
6000 rpm. I nominally have 1200-1500 fpm on take off depending whether
light or heavy and also depending on OAT. I have hit 2000 fpm on a nice
cold day. But, 1200-1500 is more the norm and my bird is a bit on the
heavy side..
If have the 2.85, I wouldn't do anything at this time
about the prop. I believe you are using a Log plenum intake are you
not? I am using the old "dynamic changer" intake. Tracy indicated he
did not believe his current intake (Log) was as effective as his old one -
but, then he is still producing close to 200 HP with his Renesis. I
presume you have an A/F indicator - do you also have a fuel flow meter - the
latter can tell you quite a bit about how much power you are
producing.
Hang in there - proceed in gentle steps
{:>)
Ed
----- Original Message -----
Sent: Friday, June 16, 2006 10:05
AM
Subject: [FlyRotary] N821GL status
report
I have a little over an hour of
flight time on my airplane now and thought I would give the group a report.
After first flight I decided to change the exhaust system. I copied Bill
Eslick and Tracy's system. I am running Bill's SpinTech muffler. It is much
quieter in the cockpit now and ground reports indicate that my exhaust is
slightly deeper that Bill's but very close.
I have a long taxi to get to the
runway. Temps at takeoff have been 150-180 for oil and 190-210 temp for water.
Reaching pattern altitude I am at 210 -215 oil and around 225 for water temp.
After leveling off oil stabilized to 205 and 210 water. Lots of
room for improvement, but it has been 90 plus degrees for every flight. On the
last flight I noticed the upper cowl is bulging between fasteners. I am
waiting for Bill's upper louver experiment to decide weather to try to exit
the air high or low.
I am getting about 5000 RPM static
and at 140 MPH the engine turns up to 6200 RPM. I would like to do a couple
ground runs with a smaller pitch prop to determine if I am over-propped or
just not producing power. If any one has a smaller pitch prop for sale or loan
please let me know. I am currently running a Performance Props Inc. 74x88.
Takeoff rolls take about 1000 ft. and climb out is very flat.
Yes
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