Jump to content

Sign in to follow this  
rhodges

PSS T7: My humble conclusions regarding porpoising (bobbing):

Recommended Posts

I have reached the conclusion that the following has been my problem relative to the porpoise issue regarding the PSS Tripple Seven.Helps to RTFM (which I confess I still have not completely studied yet), and use the utilities that the supplier worked so hard to give us (Still hope a LoadEdit utility is in the works).The porpoising or as seems to be the preferred term that has evolved bobbing issue was a real problem to me from the start. I have come to the conclusion that I was the major problem.I have the 777-200ERF and 777-300ER models. Naturally I guessed wrong and the 777-200ER seems to be the most popular relative to posts. That having been said, the 300 is definitely more senstitve than the 200 ERF, however seems reversed doesn't it? I make no claim to knowing a thing about flightsim designing, seems reversed to me. In real life, the heavier and larger the aircraft, usually the more stable it is.I started off with pretty severe porpoising just diving in and have slowly evolved into the following conclusions.1. Use the setup utility for fuel management! It distributes the fuel quite differently than what my choices were with the FS9 fuel options.2. Calculate the "COG Location (%MAC)": in the "PAX LOAD SHEET.xls" and use it!By observing this I have been able to repeat my most frustrating early trial flights with excellent solution results.In doing this, I have even been able to go to the 16X multiplier with the 300LR. Before reaching waypoints with severe compass changes (well in advance) I advise going back to x1 as the aircraft will go into a severe right bank at the point it is reduced, but it recovers with dandy stability. (Before, X4 resulted in an uncontrolled crash no matter what for me).Note that the -200LRF is much less senstitive to this, and I assume that the -200LR (which I don't have) is equal to it.These birds are growing rapidly on me in spite of my early growing pains (concluded to be mainly of my own making). The patience, answers, and tongue biting by PSS has also greatly impressed me!I hope this is of some help to somebody.Respectfully:RTH1585368CFI

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    30%
    $7,735.00 of $25,000.00 Donate Now
×
×
  • Create New...