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View Full Version : API Stinger Tailwheel on my Pacer



cook11
09-23-2014, 09:48 AM
Here is a short video of the tailwheel that I installed last night. This shows the amount of bounce it gets. I removed the Scott 3200 tailwheel as it was not swiveling properly and I really don't like the looks of it. I still need to install the proper mounting hardware along with the compression springs.

http://youtu.be/t-xnj_Ag7Qc

Steve Pierce
09-24-2014, 06:42 AM
Interesting. Tell us more about the stinger and the mount.

cook11
09-24-2014, 08:47 AM
I did a template out of conduit to get the correct angle required and I had a machine shop here in Edmonton do the mounting blocks which attach to the tail post. I used the existing tailwheel mounting points making this a bolt in retrofit. Along with the die spring main gear suspension makes for a cushy ride. So far anyone who has flown the plane is impressed with the die spring setup. It will be interesting to see how this tailwheel performs.

stevesaircraft(Bri)
09-25-2014, 12:57 AM
Friend of mine has a similar setup on his Experimental BC12-D Taylorcraft.... Going to be doing some paint work on it soon and can get some pics of his... Works real well on that airplane, but it is also real light at under 900 lbs empty...

Brian

Brian
09-26-2014, 12:50 AM
Just an observation, and I'm no mechanical engineer, but this design would appear to place a lot of twisting moment on that single attach bolt at the front of the stinger. Does the stinger provide sufficient twist and recoil to absorb the twisting moment of a side load from a crosswind or rough surface runway without over stressing that bolt ?

kevin50D
10-01-2014, 10:00 PM
This system of spring attachment may prove to be completely successful and trouble free, although the forces on the both bolts are going to be very uneven which could lead to cracking at the holes due high stress concentrations on the top and bottom of the rod.

There have been many successful RVs and other experimentals that use a vertical bolt on the upper end, but this subjects that single bolt to very high shear stress, generally the successful installations incorporate more of a sleeve fitting, similar to your tail wheel attachment. As is, when a load is applied to the tailwheel, the bottom of the spring will be in tension, with the top in compression. The only point with no shear stress will be directly through the neutral axis (horizontal). This is why the stock RV setup has two parallel, horizontal bolts on the tail wheel attach. Two bolts also help in distributing the load.

stevesaircraft(Bri)
10-03-2014, 11:37 AM
As promised.... Photos of Experimental T-Cart with stinger style tailwheel...

http://img.tapatalk.com/d/14/10/04/ejajepam.jpg

http://img.tapatalk.com/d/14/10/04/yve6ahyd.jpg

http://img.tapatalk.com/d/14/10/04/7eqadabu.jpg

http://img.tapatalk.com/d/14/10/04/pu9u5eje.jpg

This pic shows how he did it.... Welded up a receptacle that bolts to the original front bolt and saddle bolts, Stinger is inserted and bolted in at the front....

http://img.tapatalk.com/d/14/10/04/asyvypy6.jpg

Brian.

Gilbert Pierce
10-03-2014, 06:47 PM
I like Kevin's idea of bolting thru the neutral axis. The T Cart bolt that hold the stinger in the receptacle is in shear.

yarddart
12-12-2015, 10:16 AM
I think I'll stick with my 3200 I need the additional weight on the tail I have this type tailwheel on my tailwind works great but not on soft turf it tends to plow more than roll

piperrocks2013
12-12-2015, 10:59 AM
I did a template out of conduit to get the correct angle required and I had a machine shop here in Edmonton do the mounting blocks which attach to the tail post. I used the existing tailwheel mounting points making this a bolt in retrofit. Along with the die spring main gear suspension makes for a cushy ride. So far anyone who has flown the plane is impressed with the die spring setup. It will be interesting to see how this tailwheel performs.

Just noticed something or is it me?? Is that just automotive/hardware bolt I see?? Maybe just using it as a temp till you get AN bolt?? Seems alright but I'm little concerned about the side loads and cracking, and have my concerns about that back bracket. I like the experimental that Steve's Aircraft Showed. Lot better setup, maybe you try go for something like that

Jared

cook11
12-12-2015, 12:15 PM
That was temporary. Plane is down for a rebuild and will be possibly installing a Titanium stinger with a welded on adapter instead. Plane was fine with this setup. But I would just do it differently......