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Dave,
I am going to do something different with the intake at
some point. I cant get the prop RPM that I should be getting in level
flight and I refuse to hack on the prop until I convince myself that there isnt
a little more HP in the engine via a better intake. Also, my current config wont
allow the fit of an air filter and I don’t want to fly forever without one.
So would like to change the config to accommodate a filter and ram
air.
I havent decided what route to take yet. Either a better
4 port manifold or a PP engine/manifold. Waiting to see how the PP guys make out
(Mark S., how about an update). In either case I'll build it on my spare
engine and get it all done off the airplane so it is plug and play with minimal
down time. I hope to do it sometime next winter.
Current status. Havent had a chance to fly again since
my loss of power due to fuel starvation a few weeks ago. Went through the entire
fuel system but didn’t find a smoking gun. Replaced my fuel filters with some
higher flow units, but don’t believe that was the problem. Replaced my injectors
with the original ones I had rebuilt by RC Engineering. The new injectors flow
more fuel so now the tuning is a little out of whack.
Also at the last oil change I switched from a straight
weight mineral oil to Mobil One. Now my previously tight engine leaks like a
sieve. So trying to address numerous oil leaks. But I think I'm getting close to
resuming flight.
Oh, one more distraction. Just about into the soaring
season so I'm thrashing trying to get my glider ready for summer.
Mike Wills
Sent: Saturday, April 17, 2010 11:05 PM
Subject: [FlyRotary] Re: cooling for ground runs
Mike,
Repeat after me: "I will not rebuild unnecessarily, I will fly
instead." "I will not rebuild unnecessarily, I will fly instead." "I will not
rebuild unnecessarily, I will fly instead." "I will not rebuild unnecessarily, I
will fly instead."
Lets face it. You tinkered with that thing for many years. If
you were ever going to get it right you would have done it by now. So quit
trying and keep flying. :-)
On Sat, Apr 17, 2010 at 10:51 PM, Mike Wills <rv-4mike@cox.net>
wrote:
Scott,
I agree with Dave, that looks great. One picture shows
your intake manifold. Looks like you used a casting for the lower part with a
transition to tubing. Where did you get the casting? Is it a stock Mazda turbo
casting that you cut the top off of? I'd like to do something similar.
Not real happy with my current manifold and would like to rebuild
it.
Mike Wills
Sent: Saturday, April 17, 2010 9:49 PM
Subject: [FlyRotary] Re: cooling for ground runs
Thanks Scott, You are right about what I said and I will
clarify a little. I say if it wont cool on the ground, it wont cool in
the air because when I first started flying I had marginal cooling on the
ground and marginal cooling in the air. At that time I could idle and
taxi indefinitely unless the OAT was above 85 or so, when my taxi times would
be limited to about 30 minutes. cooling in the air was similarly limited
to shallow climbs and less than full power in all but the coolest of
climates. However, Chris may be talking about high power ground runs
which is a different story. A full 5 minutes at full power on the ground
is sure to push the limits of most installations, and a temporary spray bar
fed from a hose is a reasonable thought if you feel the need to do extended
ground runs at or near full power. BTW Scott, I just took another
look at your website and picture. You sure have done very nice
workmanship. I can't wait to see that thing fly! It is guaranteed
to be one of the fastest RV's around. -- David Leonard Turbo
Rotary RV-6 N4VY http://N4VY.RotaryRoster.nethttp://RotaryRoster.net
On Sat, Apr 17, 2010 at 8:55 PM, <shipchief@aol.com>
wrote:
Chris & Terria:
I had ground running temp issues at lower power. Dave Leonard told me
that it's important to get it to self cool at low to mid power on the
ground. He said that reliance on sufficient cooling when you come up to
flying speed most likely won't work if it won't self cool on the
ground. I took his advise and redesigned my cooling system, which by the way
looks a lot like yours with major differences being cooler ducting and
cooler orientation. He's a link to my page @ EAA326 site: http://gallery.eaa326.org/main.php?g2_itemId=1727Tracy
has commented that I should have reduced the cross section of my oil cooler
duct more quickly to force the air to uniformly pass thru the oil cooler
core. I applied that thinking to my water cooler which I built next, and it
worked even better than my cardboard and tape trial duct. What is the engine RPM and % load that you start to have cooling
problems?
Scott
-----Original Message----- From: Chris and Terria < candtmallory@embarqmail.com> To: Rotary motors in
aircraft < flyrotary@lancaironline.net> Sent: Sat, Apr 17, 2010
10:02 am Subject: [FlyRotary] cooling for ground runs
Gents,
I am doing the higher power ground runs now, and am
only able to run for about 5 minutes before reaching 195* or so. I’m
looking for ideas on how to extend the time for each ground run. I was
thinking of adding a spray bar like others have discussed. My thought
was to drill some holes in some PVC and connect it to the garden hose.
Then put it in the intake in front of the radiator. I would have to
run the hose out the front and clamp it down so it doesn’t come close to the
prop.
I’m open to all ideas though.
I’ve attached a picture that shows my radiator and duct
work.
Thanks,
Chris
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