Are these extensions still available from Sullivan? I just picked up a Clipper and would be interested in adding them. Put Stewart tips on a previous Tripacer, but these look simpler to complete. Thanks.
Mike Koch
Ron Sullivan sells the tips (which are excellent quality), end ribs and prefabed attachment pieces for the end rib. All that is needed is the hardware, use his list....but add screws, bolts and nuts. And, a new or used full length replacment rib. He lists a Univair number, or you can get it from Dakota Cub ( I think they are lighter), or shop for a used pair ($70-$80 new each). The only other materials that are needed is for recover (Stewart System is the easiest way to go).
I also think it is easier than the Stewart wing tip to install and it adds more square feet of wing area, which should transulate into better glides, lower stall and faster cruise (due to decreased AOA). All measurements are dependent on a number of factors, many particular to you own plane. Which, is why the Stewart's do not advertise specific numbers that you can expect to gain from their tips.
I did a wing extension last year on my plane...keeping the old druped tips (not the faster and lighter Sullivan tip)...my increased wing area made a much more dramatic change to the A/C performance than VG's...longer glide and lower stall.
I did a modification to the Sullivan STC that I'm currently installing for a customer, by making the tips removable, attaching it with screws.....This does require that the end rib be strengthened so that it does not flex when the fabic is tightened....I learned the hard way.....should have known.
Opps...forgot you need some leading edge and trailing edge material....make you own if you have access to a brake..I found buying the parts from Univair expensive and by the time I modified it to fit, I would have been well ahead starting with my own sheet aluminum.