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Climb performance flight test

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Sep 07, 2008 2:00 am Post subject: Climb performance flight test

I found out why the FAA wanted the climb performance test. Â  

 

  Turns out, they were concerned that a fiberglass cowling may be noisier than an aluminum cowling. Â Therefore, if it climbs the same or slower, it might be noisier than the the original airplane.

  

 

  We did the company testing with a 65 inch pitch prop and at 2200 lbs. Â OAT was 104 F. Â Climbed to 14,000 feet.

  

 

  Bottom line: Â Piece-O'-Cake.

  

 

  

 

  Reference: Â Looking at the POH, Section 5, Rate of Climb, shows a number of climb speeds and Rates-of-climb. Â 

  Â Â  Â  Â  Â  Â  Â  Â  Â  Â Use the 2400 lb set of data. Â 

  Question 1: Â Let's say you wanted to climb from 4500 feet to 10000 feet. Â What airspeed would you fly? Â 

 

  Question 2: Â Would you gradually reduce the speed, Vy, as you climb though each altitude increment? Â That is, climb at 85 knots to 6000 feet, then 83 knots to 8000 feet, then 81 knots to 10000 feet

  or

  Question 3: Â Would you use the set-up sample on the next page and fly the entire climb at 80 kts?

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Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)minetfiber.com
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Posted: Sun Sep 07, 2008 6:11 am Post subject: Climb performance flight test

 Turns out, they were concerned that a fiberglass cowling may be noisier  than an aluminum cowling.  Therefore, if it climbs the same or slower, it  might 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 have to do with exhaust and prop noise, which are the majority  components during a fly-over test.  Don't you have a Powerflow exhaust  system?  Which changes the noise a lot more than the cowling could.   If they were concerned about the noise they should have required a noise test  (heaven forbid) like Fred 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 altitude.

  

  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?  



 Question 2:  Would you gradually reduce the speed, Vy, as you climb  though each altitude increment?  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 entire climb at 80 kts?

  

 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  Bonanza 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 want  per your STC and revised AFM supplement, if any.  Your Vy could be slightly  different that a stock AA-5B.  Probably a little faster.

  

 Cliff





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