Confused about Speedbugs

[Wothan 173]

2 hours ago, JRBarrett said:

I believe the speed cards are just PDF files, and the one that is selected is the one closest to your current takeoff weight.  They are all referenced to Flap 15.

I almost always use Flex power settings, and dial-a-flap at considerably less than 15 degrees - both calculated with Topcat using the current takeoff runway and weather conditions. I use the Topcat calculated V speeds too.

I have taken off with flap set as low as 3 degrees, which means the VR/V2 will be quite a bit higher than on the speed cards.

Makes for a longer takeoff run, but better acceleration in the climb - especially at airports like KATL where all the SIDS require aircraft to accelerate to 250 knots as quickly as possible.

The bugs on the airspeed indicator will move to the V speeds entered in the FMS.

Nope - also the CG setting will change on the card according to what is noted in the Load Manager.

[ahsmatt7 1,199]

6 hours ago, GSproson said:

The speed card is selected by the weight you enter in the FMC.

Good to know. Thanks for the info.

[JRBarrett 3,070]

5 hours ago, Wothan said:

Nope - also the CG setting will change on the card according to what is noted in the Load Manager.

If that’s the case, some of the text on the cards must be dynamically created based on FMS or Load Manager settings. I have not used the cards, since I normally use Topcat for performance calculations.

[fakeflyer737 992]

CAN  I manually set the bugs, they're not matching what TOPCAT is giving me

[Mad_X 12]

11 hours ago, fakeflyer737 said:

CAN  I manually set the bugs, they're not matching what TOPCAT is giving me

Check my post on the last page.