Tailwheels
Tailwheel Tire Profile
Tailwheel Tire Width
There have been a lot of questions on how I got into the tail wheel building business. I will try to detail the “how’s, what’s and where we are going” parts of this story.
I had started to get to know Fred Muder and a fellow that goes by Shelly from out on the Ohio/PA border area. They have a lot of plane building background and even own a Mountain Goat of which there are only a few flying.
One topic led to another and Shelly mentioned they sure would like to find a way to build simple-strong-easy to maintain tailwheels and to get it right the first time. I offered my assistance so I sent off for the plans of a tailwheel.
In looking over the plans, my brother and I could see that it could be a tough go to build all the parts, then weld them into a true working unit. We could see how this might be done with each part being built in sequence and ending up with a true custom tail wheel, but pretty hard to build 2 or a dozen exactly the same so that the parts would interchange completely. We made a lot of changes from the very beginning. Nearly all welded up units are now one piece. They are precision CNC machining for perfect alignment, with a whole new super strong process for making yoke arms in a D tube manner.
Based on the premise that time is money, scrap is waste, tweaking is more lost time and unsuccessful tweaking is more scrap, we set about to build a better “mouse trap”.
We looked over the design, angles, size and working process then applied a better building process facilitated by CNC machines, heavy duty weld fixtures and some forward thinking. All the while proving that Made in the USA can still work! We can still produce the best product that money can buy, and keep the funds here in the USA.
A visit with Budd Davisson in AZ with his vast knowledge on airplanes assured me I was still on the right track. We set out to build 4 tailwheels. We tested the first one to destruction. We added only additional welding to the second and took it to beyond the strength of the spring. While it did bend on the tongue, it still functioned as it should have.
So with that background in mind, lets talk tail wheels!
Some facts:
The design- I started with something that would function but was difficult to manufacture matching parts, and more difficult to make them interchangeable. I kept working at it, until I got to a point that in 5 minutes I could take a main body, pull a 8″ out and slide in a 10″ or a tundra and in a few minutes have a completely different set up, yet still maintain the simple lock/unlock steering setup. I changed the locking pin to a shoulder bolt set up that provided a predictable part for manufacturing and quality control.
Improvements: (most of these can be seen in the web site photos)
- a) The top cam on the main body and the main body is one piece, NO WELDING and the main body has a grease step built in from the beginning. Those that may have been built without the grease step, the bearing is really just a bushing at that point, but it still works.
- b) The top steer assembly that holds the spring and locking pin is ONE UNIT. That is to say, the collar that is around the king pin and the tube and cam pin notch collar are built as one unit, no welding of parts, no hoping for alignment when done. Now those of you with plans for the tail wheel will appreciate how much 4130N metal is laying on the floor for these two parts to happen in this fashion. There is far more milled steel in shavings than what there is in the remaining part.
End results:
Producing a tailwheel that can last the lifetime of an aircraft and has proven to work correctly.
Replacement parts:
The wearable parts amount to about $25 to $35. Please compare that to your Scott 3200-3400 or Alaskan bush wheel versions.
Wrap up:
All this being said, I can’t say I have not had problems, I have scrapped nearly $4000 worth of parts before getting all the kinks straight and on track. And, I wish I had a couple of parts back, now that we have found a better way to build. Today you are getting more for the same dollar.
I could not be where I am today without the help of my forward thinking, out of the box, CNC machine programming brother.
New development is leading toward a wide tundra version that is friction steer only. Thus, very light and extremely simple.
Flying:
Lastly, I love flying, I love to meet the people who are all about flying…I have so many invitations to “come fly” that I could spend a year flying around the country doing just that. (Budd, is there a book in there somewhere?) This tail wheel work is about being able to see and be around aircraft, aircraft design and the great people involved in it.
I live for better designs, ponder the economy and how we got where we are and where we are going. I take pride in making forward thinking in the USA a goal worthy of production, product and revolving dollars. I won’t preach it, but I do try to live it. Fly safe, land safe, and may you always have tail winds.
