The CD has a mixer that looks like an upside down triangle with the control rods connected to the upper corners and the pivot at the bottom corner. When the stick is moved one corner of the triangle moves down, the other moves mostly sideways. The result is the flapperon on the side you are turning toward has most of the movement. The other flapperon moves much less in the down direction. I believe this is to minimize adverse yaw. Pulling up on the two corners with the pivot at the bottom makes for a self centering arrangement.This is what happens with negative flaps and the air pressure is pulling both rods up. When positive flaps are applied the air pressure pushs the control rods down. As the triangle moves, the rod going down will try to keep pushing the triangle that way. Because the other rod is moving sideways it is pushing toward the pivot at the bottom and doesn't have as much effect. So more flaps = more pressure you have to contend with.

Hopefully I explained this in a way that makes sense. It would be interesting to know how other gliders deal with adverse yaw in their control systems


From: KarlS <This email address is being protected from spambots. You need JavaScript enabled to view it.>
To: This email address is being protected from spambots. You need JavaScript enabled to view it.
Sent: Thursday, June 20, 2013 7:14 AM
Subject: [Carbondragonbuildersandpilots] Re: Phil's Carbon Dragon - progress...


Thanks Phil.. lol there buddy also.

Just a note on the fumes and that is if the wire temp is low the fumes are hardly noticeable. It wouldn't take much ventilation at all to be safe. And the slower you cut the better the surface.

If you ever want to make a setup let me know and I'll post some things on here. It only takes a 120 to 12 volt transformer and a light switch dimmer and a piece of fishing leader line or a piece of tig welding wire.

Looking good Phil. Keep at it!

One more thing on the control stick pressure issues. Rick I think you said all the CD's have a similar feel? I'm sure the wing aerodynamics are playing most of the part but I wonder if the ULF-1 control mechanics could be adapted perhaps. It's a similar side stick setup.

I will ask a friend of mine that has built several ULF-1's and is friends with Dieter Reich the designer.

Karl

--- In mailto:Carbondragonbuildersandpilots%40yahoogroups.com, "Philip Lardner" wrote:
>
> Karl - you do your directorial skills a disservice - I found myself getting
> strangely excited 2.0mins into the video (where the drop-bar makes a walk-on
> appearance) and positively emotional at 6.45mins when your new foam part is
> finally born!
>
> I decided not to go with a hot-wire set-up mostly because I was impatient to
> crack on with the project after a long and disasterous flying holiday in
> France (2 flights in 4 weeks - and a *lot* of rain...and snow! - I was
> sleeping in a tent too!!) - building a good hot-wire bench would have taken
> me off at a tangent and wasted more time. Also, my workshop has very poor
> ventilation (it's long and narrow with only one door at the end and no
> opening windows) and I didn't want to poison myself with fumes!
>
> I've learned a lot of lessons from building the first section of leading
> edge foam plug and I reckon I can knock out the remaining three sections
> much faster. I hope to cover the first section in fiberglass this weekend if
> I can rope in some help from a mate.
>
> All the best,
>
> Phil.
>
> PS - I love the Checkmate - a real work of art! Well done!!