Re: Test Flight report

Jerry Marstall <jnmarstall@...>

LJFrench wrote:

Great report. Glad things are looking good.
Just curious about a couple things:
How do you measure fuel flow? Have a fuel flow instrument from EPI (I
Does your Dynon have the engine monitoring functions i.e. EGT's,
CHT's?No, I have the D100. I do have a KSA for EGT/CHT. CHT is easy
to read, EGT is very confusing.


----- Original Message -----
From: "Jerry Marstall" <
To: < <>>
Sent: Friday, November 30, 2007 5:08 PM
Subject: [Q-LIST] Test Flight report

Not much of a test flight, just cruised around.
I am standing up to key this in because I just can't come down
enough to
sit down.
Launched at 11:20. Another perfect day: no wind, clear skies and cool.
As before, it leaped off much quicker than I am use to. Climbed briskly
to 7,500' and leveled off. The real mission was just to let it run to
continue the break-in. I think I am there. Here are the numbers.
Dont' have a spinner on yet nor wheelpants. It appears the Catto Prop
is a climb prop by the rpms. It will pop up to 2850 real quick.
Haven't run it wide open yet in level flight.

OAT = 39F; 7500'
145 mph - TAS
Manifold pressure = 22
Oil Pressure = 40
Oil temp = 210
CHT = 300/310/370/360 Since this flight I have cut down the baffles
in front of cyl's 3 & 4 to try and even out the temps on those two
EGT = ? My KSA gage is so difficult to read that I am not real sure
what they were. Will fiddle with it some more and report later. All I
can tell you now is that cyl's 1&2 were within 25 deg of one another
3&4 were within 25 deg of one another. The difference between the two
groups was 250 deg.
6.6 gph at 2600 rpm.

I can't begin to express the difference in the flying characteristics
from before. It now feels like a much larger airplane. To my
amazement, it is now a hands-off airplane. At 7,500' in cruise,
trimmed, it would oscillate up and down 25' either side of level. With
the individual elevator trim capability on the torque tube I could trim
it wings level and it would stay there. Now I can actually fold a map
without doing aerobatics.

No vibration (and the prop hasn't been dynamically balanced yet), and a
lot quieter than the Revmaster. I have 4-into-1 exhaust.

It was a real thrill just drilling around up there with such
exhilaration. I would say that I had forgotten how much fun this is to
fly but this is a totally different airplane than I was flying before.
No comparison. I even refer to the previous version as "the other
plane". It was a grueling experience over the last 3 yrs 8 months, but
WOW what a reward.

As everyone says, "keep building, its worth it."
Starting next flight I will start working on the envelope.

Only minor squawks: leaking valve covers (using silicon), springs on
the stick trim are too strong, GPS not interfacing with the Dynon. All
pretty minor in comparison to what I had been fighting.
DAT's it.

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