Super Pacer (Bushmaster) Mod

[Southern Aero]

If you are referring to my wing above, this is only used at the most outboard aileron hinge point to transfer load into front spar, eliminate torque or twist. The diagonal brace is a tension brace only running from the last compression strut to end of spar about 20", almost no compression considerations. All other bracing is mostly standard SC style and dimension. The big difference is the spar reinforcements at the strut attach fittings, very similar to the Bushmaster. The Javelin used original beefed up Piper struts with extended wings with heavy bracing in the compression area (top) of the spars. The Bushmaster/Super Pacer uses struts that are slightly longer than the stock SC

 

[Stephen]

Details on my Super Pacer/Bushmaster that I don't remember if I posted.

The empty weight CG moved from 12.38" aft to 15.8" aft.
The empty weight increased 85 pounds.
The tail weight increased 15 pounds.
I retained the original engine mount as per STC.
The plane will not stall (even more gentle than my Pacer), without power added and, the stall is benign (the is very little brake).

In my opinion the CG change improved three point landings over my unstretched Pacer. The CG is well within Piper and the STC's limitations. People who choose to lengthen the engine mount on experimental versions, I think are making a mistake. Three point landing may be harder, straight ahead stalls will be a mush and nose overs will be easier. I think the plane may end up slightly nose heavy.

Some people like the extended engine mount because it makes the plane look more Cub like...... it's a Pacer...... actually, a Tri-Pacer!

 

[Just Call Me Al]

Maintaining several Pa-18/12/14s with the ext wing long flaps and ailerons I see the weak link with the flap as the flap hanger/hinges loosen up in the False Spar over time especially in the 180 and 200 hp cubs. I have installed the pa-12 reinforcing brackets that bolt to the false spar around the hangar. Solves this problem.

I also see increased wear on the rod ends and on the inboard flap hinges and pins in the prop wash area. I believe the second flap bell crank and actuator rod will help solve this.

I plan to use the double bell cranks on the Super pacer project I am rebuilding.

I got some of the PA-12 reinforcing brackets but the angle on them is wrong for the PA-22 false spar. I checked on a PA-12 and they mate right up.

 

[Jeff Pralle]

I got some of the PA-12 reinforcing brackets but the angle on them is wrong for the PA-22 false spar. I checked on a PA-12 and they mate right up.

Sorry if my post lead you down the wrong path. You are correct the brackets will NOT work on a pa-22 false spar. I do believe the 4 hangar flaps with 2 bell cranks and push rods will resolve the loosen8ng/ twisting moment.

 

[Just Call Me Al]

Re: Super Pacer (Bushmaster) Modification

View attachment 14658View attachment 14659View attachment 14660

Here are a few more pictures showing both forward and aft (middle picture) spar, all I could find on the brackets. I did use standard PA18 attachment fitting for the front spar and as I remember I had to cut them down because they were too long.. I spent a lot of time getting the attachment brackets located. But, there is some flexibility. The struts will be built to the actual distance.

For the front spar strut fitting, used Piper PN#14192. In the Sper Pacer drawings, it calls for a gap of 1.02-1.10". But with the 14192 fittings, they have an extra spacer (in the Piper drawing, PN#10541) welded inside the mating surface to strengthen the strut attach hole, which narrows up the gap by roughly 0.15". Did you space out the strut attach fittings further to account for this or make the end of the strut narrower?

View attachment 18551http://www.supercubproject.com/drawings/pdfs/A3290625.pdf
Another question, in setting the washout in the wing before installing leading edge skins, did you put in the twist that a PA-18 wing has at the PA-18 station ( the OB rib of the aileron bay)?

Thanks,
Al

 

[Southern Aero]

Weld the 10541 "plate" on the inside of the channel would eliminate the problem. But the SP prints call for the Piper 15631 spacer just above the attach point that would determine the spacing to be the normal .978. I haven't got to the wings yet on our builds, still working on the fuselages.

 

[Just Call Me Al]

On the airspeed indicator for a Super Pacer, what is the top of the white arc (Vfe)? It is not listed in the SAC-1000 drawing.