A/c bouncing on runway in FS9?

[doylebob]

Hi all,

I'm having a small problem in FS9 and I was wondering if there is a fix. My problem is aircraft bouncing on runway (some airports only) during takeoff run or while landing. However, if I takeoff from the adjacent parallel taxiway, everything is fine.

I heard somewhere before that this may be due to wind direction. So, I tried using the opposite direction on the rwy. Same result.

I also heard that a "fix" was to place a taxiway beneath the runway in AFCAD. I tried this also, but same result.

Airport is GMTT (rwy 10/28) using default C128 (a/c doesn't seem to matter)

Anybody come across this before?

Bob

[ashaman]

Some airports, like PHNL, have this defect inbuilt. Even if there's no other scenery, and FS9 is freshly installed, crossing some points will make the plane jump. No reasons were ever given, no solution ever found at my knowledge.

In the case of GMTT, it seems to be the material the runway was made of in its AFCAD. In the case of a runway made of Macadam or Bituminous, the plane keeps undulating while wheeling on the runway. Only solution I know is to use AFCAD and redefine the material of the runway as another material similar in aspect, like Asphalt.

[doylebob]

Thanks Ashaman. I tried what you suggested and changed the runway material to Asphalt but no change in the "bouncing".

I appreciate your help though.

Thanks
Bob

[ashaman]

Odd... just tried it myself. Entered AFCAD, loaded GMTT, double clicked the runway and in the property windows changed the drop down value from bituminous to asphalt and the plane goes straight without bouncing.

I know this works because it's a problem of my home base airport default as well (LIRN), and before the Napulevola magnificent scenery came about, it was like this that I made the runway stop trying to make me seasick.

[Randy_Cain]

Hi Bob,

Another way to get rid of the "bounce" if you don't like it, or if it was a mistake made by the person the built the airport, is grab FSFlatten and make a "flattened" rectangle under the area that's giving you trouble. (Just drop the file you made into the scenery folder with of the same airport.)

If the runway/taxiway was added to an airport that all ready existed, or the entire airport was added to FS9, it may simply be an oversight by the designer.

Keep in mind, many airports aren't intended for "everything" to be flattened, but taxiways, runways, tarmacs, and aprons probably should be. ...unless it's sand or dirt, in which case that effect is appropriate.

Yours,

[ashaman]

To flatten the terrain under a runway simply use a custom apron rectangle. The terrain under the apron is automatically flattened an given the consistency and behavior (Microsoft style) of the material used for the apron.

[doylebob]

Thanks for the suggestions guys.

I tried creating a concrete apron and placing it beneath runway 10/28. I made it with dimensions just a tad bigger than the actual rwy and slid it under using AFCAD. Unfortunately, the result are still the same (bouncing/oscillating on runway)

The thing that confuses the heck out of me is that if I taxy down the taxiway (adjacent/parallel to 10/28) I can hit >60kts and it's like driving on a pool table. Smooth as silk!

I'm using the default C182 and the default GMTT in FS9.

I have not tried Randy's suggestion of using FSFLATTEN. I am not familiar with that program so I was hoping to be able to eliminate this using AFCAD. Is FSFLATTEN freeware and, more importantly, is it easy to use?

Bob

[doylebob]

Eureka!

I got it to work. It was a combination of both of Ashaman's recommendations that fixed the problem.

1). First I created an asphalt apron and placed it under the offending runway.

2). Then I changed the material of the runway from Bitumen to Asphalt.

And Voila, no more bumpy runway. Victory is Mine!

Thanks for the suggestions/help guys.

Bob