Spar reinforcement / exp. Pacer

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GoatRoper

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Se Wisconsin
Hi all,
Building an experimental stretched Pacer. Fuselage repairs and mods complete, primed and painted and on her gear. Looking for information on spars. I received wing materials with this project, Carlson spars , ribs etc.
Question is if I want to achieve 2100, 2200 gross weight what if any reinforcing I need to add to spars?
I have Blanton plans so I'm aware of how that's done but looking for more up to date methods if possible.
Thanks ,

TW
 
The STC calls for a number of wing reinforcement. Not just the spars. You can see most of the reinforcement if you look back at the pictures I posted here a few years ago. The PA 18 wing does not have the same reinforcement. Try and get a look at a certified stretched Pacer. Don't skimp.
 
Thanks Stephen, I found pictures of mods to your plane. It seems those reference adding to an existing short wing. Spar splicing, reinforcing etc. To be clear, I'm starting from scratch. I have a set of 2+2 plans with a wing for 2200 gw but all wood as I'm sure you know. I'm hoping to stay with the aluminum parts I have if possible, thanks again,

TW
 
I will have to look for pictures of the Dakota Cub Super 18 wing. It has doublers on the spar web at the strut attach fittings and solid aluminum blocks at the wing attach unlike the Piper parts.
 
Can't find any good pictures but here is what I have.
Rear spar doubler.
103_8661.JPG

You can see the front spar doubler a little bit and the row of rivets for the front of the rear spar doubler.
103_8662.JPG

103_8663.JPG

The wing attach blocks. Piper's did not pass the 2300 lb gross weight that Dakota Cub took their Super 18 wing up to.
103_8664.JPG

You can blow this up and see the doubler. These are the Super 20 Dakota Cub Slotted Wings.
103_8665.JPG

101_8655.JPG
 
GoatRoper said:
Thanks Stephen, I found pictures of mods to your plane. It seems those reference adding to an existing short wing. Spar splicing, reinforcing etc. To be clear, I'm starting from scratch. I have a set of 2+2 plans with a wing for 2200 gw but all wood as I'm sure you know. I'm hoping to stay with the aluminum parts I have if possible, thanks again,

TW
Click to expand...

People think putting in a new full length spar is stronger than splicing on an extension. The STC calls for the same reinforcement either way. The reinforcement to the web straddles the strut attachment point it is extensive and extends 3 or 4 feet. It is layered and shaped to avoid stress points. The other reinforcement is a doubled drag wire set up near the wing tip, increased ribs and compression struts and a stronger leading edge. Other spar strengthening occurs for the new jury struts.
 
Thank you both, very helpful. I will continue to research this with help from the wagaero faithful too , as I am based 3 miles from them and our home airport has very good knowledgeable builders and several wag products. I may end up just following the 2plus2 plans I have also.
Thanks guys.
TW
 
GoatRoper said:
Thank you both, very helpful. I will continue to research this with help from the wagaero faithful too , as I am based 3 miles from them and our home airport has very good knowledgeable builders and several wag products. I may end up just following the 2plus2 plans I have also.
Thanks guys.
TW
Click to expand...

Good luck. Let us know how your project goes and post pictures.
 
111.jpg

Superpacer spar reinforcement. I have seen the video of the wing load testing for this STC. The Superpacer wing is extremely strong. I know of one stretched Pacer who did not do this reinforcment. He is a highly experienced Super Cub mechanic and nerver trusted the wing strength and refused to sell the plane because of potential liability. The plane was ultimately destroyed.
 
Nice pictures, thank you Stephen. Does anyone sell those reinforcement parts outright? Or is it all done through the stc?
 
GoatRoper said:
Nice pictures, thank you Stephen. Does anyone sell those reinforcement parts outright? Or is it all done through the stc?
Click to expand...

I made my own, which took a couple of days. I think James Smith the owner of the STC was interested in having sets made up, not sure it happened.
 
Just Call Me Al said:
Smith is working with Southern Aero to have the spar reinforcement plates made on a CNC mill.
http://southernaero.net/contact.html

AL
Click to expand...

I wish I had this option.

BTW, relocating ailerons and flaps binge brackets when your wing is open is not that big of a deal. I would not determine my flap and ailerons sizes based on existing location's. Select what you think is the ideal size for your control surfaces. You may regret compromising.
 
Good morning guys. Took year off to work on house addition. Back at gathering wing parts currently. Does any one have a good picture of the compression strut and drag wire set-up at the lift strut fittings? As wires are doubled outboard of this area, what is configuration at the strut fitting?
Thanks
GR
 
There are other ways to do this rather than double wires. They are just to keep the wing from twisting with the ailerons moved out to the tip.
 
GoatRoper said:
Hi all,
Building an experimental stretched Pacer. Fuselage repairs and mods complete, primed and painted and on her gear. Looking for information on spars. I received wing materials with this project, Carlson spars , ribs etc.
Question is if I want to achieve 2100, 2200 gross weight what if any reinforcing I need to add to spars?
I have Blanton plans so I'm aware of how that's done but looking for more up to date methods if possible.
Thanks ,

TW
Click to expand...

Since you’re experimental, it’s really up to you as to how much you want to reinforce the wing. I picked up some spar doublers from EA structures out of Canada, I know southern aero makes a nice set as well.
 
Southern Aero said:
There are other ways to do this rather than double wires. They are just to keep the wing from twisting with the ailerons moved out to the tip.
Click to expand...

I’m working on this right now with my wings, what are some other ways to keep the wing from twisting? I’m not able to double up drag wires without moving ribs around on my wing.
 
Southern Aero said:
A couple ways ............You can use an N strut similar to what is at the strut attach fitting or something like in this pic. Co-locate structure with the last hinge point. It transfers the rear spar "twisting" forces to the front spar.

View attachment 23323View attachment 23324
Click to expand...
What are you using for drag wires in between the compression struts? In the picture it looks like tubing rather than a wire.
Also what is the drag wire anchored on since there is no compression strut out the outboard end of the drag wire connection to the spar?
BIG rear door in the fuselage. Is the vertical tube where the flap cable goes up the back of the baggage area removed and truss built around the opening?
AL

AL
 
Al

The first bay has the drag tube same as a Super Cub. The next 2 bays are #10 wires. The spars are 15" longer than the original spar length ........ so still a "short wing" ............The small tube at the end is a short drag brace from the last set of wires to almost the tip rib that's not yet installed. Not much drag at the tip. No tip bow just a Hoerner type tip. Flap controls are all over head. The rear doors are patterned after the Maule, I just put them on the left "port" side.
 
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