Variable incidence is allowed. Somebody in the northwest actually built a profile Crusader with a pop-up wing (was it John Hall?) The closest the rules come to saying anything about a slider is that the lines must emerge from the model within the fore-aft range of the root chord. It doesn't specifically say they can't change position, so by "default" they can. And jet planes can have props; I don't remember if they ever couldn't. And no pesky BOM!

Clear the workbench. If you start now you can have it ready for this season!

Found it,  first plane in photo of Dallas Carrier Contest.

. Somebody in the northwest actually built a profile Crusader with a pop-up wing (was it John Hall?)

Bill, yes it was John Hall. He flew it at the Tri Cities nats in 1989 and I have a video of it.  While it was rather innovative it really didn't slow the plane very much at all as it only "popped up" about 3".  I never saw it again and wonder if John ever flew it again in competition.  I think the "pop up" was too scale and might have worked better if it raised 6 or so inches when deployed. However it just might have been a real dog if it did, with too much drag to allow flight.  If anyone can download this tape I would be happy to loan it out briefly.  It covers a lot of carrier action of the 89 Nats including long segments of Carlos's slow flights s the 5PM clock ran down. By the way, John was my center judge at this meet and used a fool proof 60 degree checking devise that myself and another guy designed. John also wore out one shoe as the center judge that year.  Myself and others have often wondered why the devise never was used again at any Carrier competition as it was far superior to holding a plastic triangle.  It was counter balanced so no matter how a judges hand or arm moved or became fatigued it showed a perfect 60 degree translucent colored area in regards to the ground. Attached are two pictures of the first prototype. There is a "stop" buton on the back side incase one gets a bit shakey.  Once it is tapped the guide retuns to exactly where it should be for the center judge.
Joe

What is the wing span on Dave's corsair?  I was wondering because I have one that my dad started but I can't find the plans for it and don't know what it was built from.

I checked out that website and that is probably what this one is.  If it had wing tips the wing span would be about 35.5 and judging by the pic of the plans that is on the site it looks the same.  Thanks for the info.

David