Author Topic: 109 g6 vs g2  (Read 3557 times)

Offline Slade

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Re: 109 g6 vs g2
« Reply #60 on: December 27, 2011, 02:43:40 PM »
Quote
The G-2 has a turn radius of 636 ft while the G-6 has one of 648 ft.

How would a non-aerodynamics engineer determine this for any air plane without using the old website that showed it (think it was soda's site)?  Just like to know if it is easy to determine dynamically (in-flight).

Thanks.
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Offline Lusche

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Re: 109 g6 vs g2
« Reply #61 on: December 27, 2011, 03:36:06 PM »
How would a non-aerodynamics engineer determine this for any air plane without using the old website that showed it (think it was soda's site)?  Just like to know if it is easy to determine dynamically (in-flight).

Thanks.

Look for Badboy's bootstrap calculator (posted somewhere in Help & Trainig). In a nutshell, you can determine radius by flying a precise, tight circle (no altitude or speed change) at the edge of stall. With the speed and time for a 360° circle known, you can calculate the radius.
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Offline Brooke

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Re: 109 g6 vs g2
« Reply #62 on: December 27, 2011, 04:31:17 PM »
Yep, do a bunch of full circles to get your plane to its steady turning speed, then time how long it takes (in seconds) to do three full revolutions.  (Start a stopwatch when your nose crosses a landmark and stop it when it crosses for the third time.)  Also, with the E6B, note your true airspeed during the turn.

(turning radius in feet) = (true airspeed in mph) x (5280 / 3600) x (seconds for three revolutions) / (3 x 2 x 3.14)

Unless I've made a math error, of course.


Offline pervert

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Re: 109 g6 vs g2
« Reply #63 on: December 27, 2011, 08:11:41 PM »
How would a non-aerodynamics engineer determine this for any air plane without using the old website that showed it (think it was soda's site)?  Just like to know if it is easy to determine dynamically (in-flight).

Thanks.

You could use Gonzoville

http://www.gonzoville.com/charts/

It is still limited by your ability to perform the tests, and your ability to turn, Badboy's bootstrap is as he states a rough guide, and only as good as the data a pilot can enter or their ability, but very interesting non the less.

Gonzoville also states the aircrafts typical loadout but not the fuel, or if they used wep while making the turns. Weight and wep makes a big big difference to a plane turning. Gonzoville's test also do not state if the fuel burn is set to 0.

Using Badboy's method on the deck with fuel burn at 0

Example FW190 D-9 Full fuel, no wep, full ammo and no flaps has a turn raduis of 949 ft. A much worse result than Gonzoville's 846 ft effort by MOSQ.

Switch on the wep with full ammo no flaps and 25 percent fuel, and that changes to 814 ft a big big difference. It is now better than the 846 ft listed on Gonzoville by MOSQ.

So in short it still comes down to pilot skill in a turn, I think only HTC could perform that kind of turn test perfectly??

Offline Badboy

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Re: 109 g6 vs g2
« Reply #64 on: December 27, 2011, 08:49:09 PM »
How would a non-aerodynamics engineer determine this for any air plane without using the old website that showed it (think it was soda's site)?  Just like to know if it is easy to determine dynamically (in-flight).

Hi Slade,

Try this:

http://www.leonbadboysmith.com/Files/AH_BootStrap.zip

Hope that helps.

Badboy
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Offline Badboy

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Re: 109 g6 vs g2
« Reply #65 on: December 27, 2011, 08:50:22 PM »
Unless I've made a math error, of course.

Nope, your math is good :)

Badboy
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