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1. 05:33 AM - Re: Dive test (flyv35b)
2. 09:03 AM - Re: TeamGrumman-List Digest: 1 Msgs - 10/19/08 (GOLDPILOT@AOL.COM)
3. 12:19 PM - Re: TeamGrumman-List Digest: 1 Msgs - 10/19/08 (Gregory Ketell)
Message 1
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Congratulations on the successful test and integrity of the cowling! Very
interesting info, Gary.
I guess this test shows the much lower drag coefficient of the Malibu. But
maybe more importantly the effect of a CS prop, in a power off dive at lea
st. It would be interesting to know how much of the difference is caused b
y the fixed pitch prop and how much by just the airframe drag. Sounds like
you made a good choice for a chase plane.
I think there has been discussion before about the Grumman airfoil resultin
g in a large increase in airfoil drag, starting somewhere over 170 mph, and
pitching moment which results in a lot of tail trim drag. With the high r
edline speed, it would be interesting to see what a different airfoil and a
CS prop would do for this plane in reducing drag.
Cliff
----- Original Message -----
From: teamgrumman@aol.com
To: teamgrumman-list@matronics.com
Sent: Sunday, October 19, 2008 11:22 PM
Subject: TeamGrumman-List: Dive test
Friday we managed to get all the ducks (i.e., FAA and paperwork) lined up
and we flew the dive tests.
Well, as it turns out, a Piper Malibu CAN be used to pace a Tiger, but it
isn't easy. I had to stand the TIger on it's nose to get it to 220 mph.
A Malibu at the same angle of decent screams right by the Tiger, even with
the power at cutoff. We tried it twice.
Then, we tried a much shallower dive and ran out of altitude before I got
it to 190 mph (redline is 200 mph, target speed was 230 mph).
SOOOOOO, as it turns out, the gear on a Malibu can be extended at 170 kno
ts and can be flown to 201 knots with the gear down. We needed 195 knots (
224 mph, due to the position error on the Malibu.) to make the dive count.
So far so good.
The 4th test proved that the Malibu, with the gear hanging down, has abou
t the same drag as a Tiger. We were close.
On the fifth test, with the Malibu alongside the Tiger, we went to 200 kn
ots. Next step, we wait to see if the FAA will accept the video and flight
data.
--------------------------------------------
Now, for the rest of the story.
On the first dive test, we saw 240 mph on the Tiger. It wasn't easy.
On the second dive test, the air got a little rough=2 0just above the beg
inning of the yellow arc so we knocked off the test. The Malibu still blew
by like I was parked.
On the third test, we got to 190 mph before I knocked of the test due to
my own minimum altitude limit (5000 AGL)
On the 4th test (Malibu with its gear down and 100 feet off my left wing)
, we easily got to 220 MPH indicated. Unfortunately, the indicated in the
Malibu showed we were too slow by about 6 mph.
On the 5th test, again with the Malibu about 100 feet off my left wing, g
ear down, we got to 235 mph on the Tiger; 200 knots on the Malibu.
Word of note: You will never even get close the the redline on a Tiger.
Pointing the plane nearly straight down, at 190 mph, it stops accelerating
with the engine at 2650 rpm. I had to nudge the throttle to cut the drag
from the prop in order to get past 220 mph. It's very difficult to get to
the plane's redline with a fixed pitch prop. Clearly, with a constant spee
d prop, this test would have been a whole lot easier.
At 240 mph, the plane is as smooth as glass. It takes a tremendous amoun
t of forward stick to get it to dive at those speeds. Recovery is nothing
more than relaxing the pressure on the yoke. We never experienced more tha
n a little over 1g pulling out of a dive. About a 5000 f oot loss in altit
ude. Very stable plane. The FAA inspector was impressed. Nuff said.
Oh, yea, the cowling didn't bulge out or do anything it wasn't supposed t
o do.
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| Subject: | Re: TeamGrumman-List Digest: 1 Msgs - 10/19/08 |
Very cool........did you wear a parachute???????
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Message 3
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| Subject: | Re: TeamGrumman-List Digest: 1 Msgs - 10/19/08 |
Congrats, Gary. I'm really glad you were able to get the testing
done. Now, hopefully, the FAA will "get 'r done"!
GK
On Oct 19, 2008, at 11:58 PM, TeamGrumman-List Digest Server wrote:
> *Time: 11:23:18 PM PST US
> Subject: TeamGrumman-List: Dive test
> From: teamgrumman@aol.com
>
>
> Friday we managed to get all the ducks (i.e., FAA and paperwork)
> lined up an
> d we flew the dive tests.
>
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