Today's Message Index:
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1. 03:00 AM - Climb performance flight test (teamgrumman@AOL.COM)
2. 07:11 AM - Re: Climb performance flight test (flyv35b)
Message 1
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| Subject: | Climb performance flight test |
I found out why the FAA wanted the climb performance test. =C2-
Turns out, they were concerned that a fiberglass cowling may be noisier than
an aluminum cowling. =C2-Therefore, if it climbs the same or slower, it m
ight be noisier than the the original airplane.
We did the company testing with a 65 inch pitch prop and at 2200 lbs. =C2
-OAT was 104 F. =C2-Climbed to 14,000 feet.
Bottom line: =C2-Piece-O'-Cake.
Reference: =C2-Looking at the POH, Section 5, Rate of Climb, shows a numbe
r of climb speeds and Rates-of-climb. =C2-
=C2-=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2-Use the
2400 lb set of data. =C2-
Question 1: =C2-Let's say you wanted to climb from 4500 feet to 10000 feet
. =C2-What airspeed would you fly? =C2-
Question 2: =C2-Would you gradually reduce the speed, Vy, as you climb tho
ugh each altitude increment? =C2-That is, climb at 85 knots to 6000 feet,
then 83 knots to 8000 feet, then 81 knots to 10000 feet
or
Question 3: =C2-Would you use the set-up sample on the next page and fly t
he entire climb at 80 kts?
Message 2
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| Subject: | Re: Climb performance flight test |
Turns out, they were concerned that a fiberglass cowling may be noisier tha
n an aluminum cowling. Therefore, if it climbs the same or slower, it migh
t be noisier than the original airplane.
What a bunch of BS! As if there would be enough difference that you could
even measure it or repeat the test that accurately. What's the cowling hav
e to do with exhaust and prop noise, which are the majority components duri
ng a fly-over test. Don't you have a Powerflow exhaust system=3F Which chan
ges the noise a lot more than the cowling could. If they were concerned ab
out the noise they should have required a noise test (heaven forbid) like F
red had to do, not a climb test. Fred's plane climbed so much faster than
a stock Tiger that it was a lot higher and further away from the microphone
and therefore quieter, even though it was probably noisier at the same alt
itude.
Reference: Looking at the POH, Section 5, Rate of Climb, shows a number of
climb speeds and Rates-of-climb.
Use the 2400 lb set of data.
Question 1: Let's say you wanted to climb from 4500 feet to 10000 feet. W
hat airspeed would you fly=3F
Question 2: Would you gradually reduce the speed, Vy, as you climb though
each altitude increment=3F That is, climb at 85 knots to 6000 feet, then 83
knots to 8000 feet, then 81 knots to 10000 feet
or
Question 3: Would you use the set-up sample on the next page and fly the e
ntire climb at 80 kts=3F
Since Vy decreases with altitude it would seem that you should decrease the
climb speed as you climb so you stay as close to Vy as possible. The Bona
nza POH shows a graph where Vx and Vy start apart and converge to the apex
of a triangle at the service ceiling, with Vy decreasing and Vx increasing
with altitude. But you should be able to choose what climb airspeed you wa
nt per your STC and revised AFM supplement, if any. Your Vy could be sligh
tly different that a stock AA-5B. Probably a little faster.
Cliff
----- Original Message -----
From: teamgrumman@aol.com
To: teamgrumman-list@matronics.com
Sent: Sunday, September 07, 2008 3:00 AM
Subject: TeamGrumman-List: Climb performance flight test
I found out why the FAA wanted the climb performance test.
Turns out, they were concerned that a fiberglass cowling may be noisier t
han an aluminum cowling. Therefore, if it climbs the same or slower, it mi
ght be noisier than the the original airplane.
We did the company testing with a 65 inch pitch prop and at 2200 lbs. OA
T was 104 F. Climbed to 14,000 feet.
Bottom line: Piece-O'-Cake.
Reference: Looking at the POH, Section 5, Rate of Climb, shows a number
of climb speeds and Rates-of-climb.
Use the 2400 lb set of data.
Question 1: Let's say you wanted to climb from 4500 feet to 10000 feet.
What airspeed would you fly=3F
Question 2: Would you gradually reduce the speed, Vy, as you climb thoug
h each altitude increment=3F That is, climb at 85 knots to 6000 feet, then 8
3 knots to 8000 feet, then 81 knots to 10000 feet
or
Question 3: Would you use the set-up sample on the next page and fly the
entire climb at 80 kts=3F
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