Freeflight Design Shop Forum


Re: Fowler Flaps in Gmax?

Posted by Milton on Tuesday, 1 October 2002, at 6:19 p.m., in response to Fowler Flaps in Gmax?, posted by Tim Conrad on Tuesday, 1 October 2002, at 4:57 p.m.


Check the tutorial section for Lee Rosairo's Partial Animation Sampler and Chris File's site.

There are many ways to do this and many steps involved. The general steps I used are:


1. Remove the section of the wing that the flaps will occupy. You may want to use the removed section to begin the shaping process for the leading edge flap. Size and shape it and fill in all the surface areas.

2. With the leading edge flap formed, clone it, then use that as a basis to create the next flap. Repeat for any other flap sections. Give each of these flaps the appropriate tags for keyed animation. (ex: l_pct_trail_edge_flap0)

3. When shaping, ensure these flaps will slide comfortably into each of their leading edge flaps or fit snugly into the wing as required.


1. Position the leading edge flap at its home (zero flaps) position.

2. Set the pivot so that when rotating, it gives you that slide, droop effect. For me, that meant setting the LOCAL pivot well below the leading edge (like 2-3 feet). Experiment or calculate the exact distance and angle required to give you the precise arc of movement.

3. Once you have it working properly, proceed with its animation.

4. Position the next flap at the home position with respect to the leading flap. Before animating it, link it to the leading edge flap and position your pivot.

5. Once the final flap is done, do the animation from zero to 100 key frames. Move the flaps to the fully extended position (40 degrees or whatever) and test.


1. Once tested and working correctly, select all the wing and flap components, clone, and mirror modify for the other side.

2. Pivots must be adjusted for the other side. Generally speaking, these are the reverse angles of the originals for the longitudinal and vertical axes and the same for the horizontal. (I think).


1. Add Flap sections to the .cfg file. A good start is to copy the default 747 sections 0 and 1.

2. Adjust the parameters as required for your aircraft.

Hope this helps to get you started. Now go have fun, and take your time with this. ;-)


> Hi All, Is there any Tuts out there on Gmax Fowler Flap Animation?
> I'm building a RIDA Pony, and need to ensure correct flap movement.
> Thanks All, Tim Conrad

Back to TIPS

The Freeflight Design Shop Forum is maintained with WebBBS 2.25.