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Dave, you don't mention what your OAT was during
your runs - it do make a difference. Since I only have a 2300 ft runway,
I've never tried runs down 5000 ft and observed what the temps were. I do
know that on a hot day (90F+) I can see 210-220F on the coolant and
200F on the oil during the climbout to pattern altitude. By the time my
airspeed is up to 120MPH IAS, the coolant and oil temps have started back down
and stabilize around 190 oil and 200F during the remainder of the climb to 3000
MSL. After than the temps settle down to 170-180F during cruise on a 90F+
day on the ground.
I would be prepared on my first test flight to make
pattern circuits. By the second time around the pattern at reduce power,
your temps should be below 200F. My first flight only lasted 4 1/2 minutes
(once around) as my oil temp was over 240F by the time I reached 400 AGL.
So its difficult to say, they appear a bit on the
warm side but a high power high speed taxi means you are generating a lot of
power while your airspeed (for an appreciable portion of the run) is low, the
worst conditions to face. Once you get airborne, you generally reduce your
power (I wouldn't on my first flight until I had to) and you pick up airspeed,
both of course which help the cooling aspects.
I don't see anything that would make me reconsider
a first flight. I would just have a contingency plan (or two) depending on
cooling conditions encountered after lift off.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Saturday, July 03, 2004 11:18
AM
Subject: [FlyRotary] Reality Check
Congrats, Todd, That must be a great feeling. I like
running behind the engine I rebuilt myself instead of the "new" engine I used
to have.
As I approach my first flight I need a reality check.
Like Steve, I am starting to worry about cooling. I did some high speed
taxi testing yesterday. Everything went very well but I am very
impressed with how quickly using high power will make the coolant temps go
up.
After 2 high speed runs down the 5000' runway everything seemed to
be heat soaked and up to steady state - oil 180, coolant 160. With only
a few seconds of high power needed to get me up to stall speed on my third
run, the coolant had heated up to 220 by the end of the runway, but cooled
back down to 180 on the taxi back.
This seems somewhat in line with
what others have reported as successful, but I am afraid of what high power on
climb-out is going to do.
Is there anyone who feels that this is
probably not going to be good enough?
Thanks,
Dave
Leonard
>
> Well after a little time
out for an engine rebuild I finally got back
> into the air again.
Tonight's flight was 1 hour and absolutely no problems
> at all. I
wasn't planning on flying again until I installed my transponder
> due
to an incredible amount of water bomber traffic at our strip, but the
>
damned thing is still somewhere between Australia and here. They were
>
extremely aggressive at attacking the fires so that when we had some
>
moderately heavy rain these last 2 days they gained complete control
and
> this morning declared them 100% contained. So this evening was
eerily quite
> up at the airport, just begging for me to go flying... so
we did.
> It sure was good to get back up there
again. Tomorrow should be more of
> the same so I hope to get some good
tests done and have more to report.
> S. Todd Bartrim
> Turbo 13B
RV-9Endurance
> C-FSTB
>
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
>
> "Whatever you vividly imagine, Ardently desire,
Sincerely believe in,
> Enthusiastically act upon, Must inevitably come
to pass".
>
>
>
Well after a little time out for an engine rebuild I finally got back into the
air again. Tonight's flight was 1 hour and absolutely no problems at all. I
wasn't planning on flying again until I installed my transponder due to an
incredible amount of water bomber traffic at our strip, but the damned thing
is still somewhere between Australia and here. They were extremely aggressive
at attacking the fires so that when we had some moderately heavy rain these
last 2 days they gained complete control and this morning declared them 100%
contained. So this evening was eerily quite up at the airport, just begging
for me to go flying... so we did.
It sure was good to get back up there again. Tomorrow should be more of
the same so I hope to get some good tests done and have more to
report.
S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".
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