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Stability

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wamflight(at)gmail.com
Guest

Posted: Mon Nov 20, 2023 4:12 pm Post subject: Stability

I have a Piet with motorcycle tires.

Do these tires make a difference during landing as opposed to regular aircraft tires? I can do a perfect wheel landing. As soon as I lower the tail it is all over the runway, in the grass and weeds.

It is the most unstable, unpredictable aircraft I have ever flown. I fly cubs, Champs, and 365 hp yak50. (Tail wheel) maybe it’s the small tail wheel?

What am I doing wrong?

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flyingscott_k(at)hotmail.
Guest

Posted: Tue Nov 21, 2023 3:03 am Post subject: Stability

Hi Bill,



I have an arrangement like you have on my Piet.  I don’t find wheel landings, as you appear to be describing, the best method of landing my Piet (187 hours of flying grass and asphalt).  Try three point landings on grass. When all three wheels touch full aft stick and keep it there for the roll out.  If there is a crosswind, the airplane will not respond well to a traditional low wing into wind and yaw to align with the runway.  You’re better to apply a simple crab kick method and then introduce a small roll onto wind for the landing roll out.

Your motorcycle wheels on a Pietenpol with wood gear will not have any toe in or out so they should not be the culprit. One possibility is that if your tailwheel steering is one to one with your rudder horn it is likely over steering.  This is because your tailwheel horn is half the length of your rudder horn.  It should be two to one.  (50% throw of the tailwheel vs your rudder).

I have a couple thousand hours on various tailwheel aircraft and have found no difficulty flying my Piet.  Just some nuances as mentioned above and a possible correction you may require in your tailwheel steering. Good luck!



Scott Knowlton



 	  Quote: 	
		   On Nov 20, 2023, at 7:14 PM, Bill <wamflight(at)gmail.com> wrote:



 



 I have a Piet with motorcycle tires.

 Do these tires make a difference during landing as opposed to regular aircraft tires? I can do a perfect wheel landing. As soon as I lower the tail it is all over the runway, in the grass and weeds.

 It is the most unstable, unpredictable aircraft I have ever flown. I fly cubs, Champs, and 365 hp yak50. (Tail wheel) maybe it’s the small tail wheel?

 What am I doing wrong?

- The Matronics Pietenpol-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Pietenpol-List

wamflight(at)gmail.com
Guest

Posted: Tue Nov 21, 2023 4:54 am Post subject: Stability

Thank you. Tail wheel steering is pretty responsive. I’ll check it out and see if I can win at least one battle with her!

Bill

 	  Quote: 	
		   On Nov 21, 2023, at 05:04, Scott Knowlton <flyingscott_k(at)hotmail.com> wrote:

 Hi Bill,

 I have an arrangement like you have on my Piet.  I don’t find wheel landings, as you appear to be describing, the best method of landing my Piet (187 hours of flying grass and asphalt).  Try three point landings on grass. When all three wheels touch full aft stick and keep it there for the roll out.  If there is a crosswind, the airplane will not respond well to a traditional low wing into wind and yaw to align with the runway.  You’re better to apply a simple crab kick method and then introduce a small roll onto wind for the landing roll out.

 Your motorcycle wheels on a Pietenpol with wood gear will not have any toe in or out so they should not be the culprit. One possibility is that if your tailwheel steering is one to one with your rudder horn it is likely over steering.  This is because your tailwheel horn is half the length of your rudder horn.  It should be two to one.  (50% throw of the tailwheel vs your rudder).

 I have a couple thousand hours on various tailwheel aircraft and have found no difficulty flying my Piet.  Just some nuances as mentioned above and a possible correction you may require in your tailwheel steering. Good luck!

 Scott Knowlton

> On Nov 20, 2023, at 7:14 PM, Bill <wamflight(at)gmail.com> wrote:

> 

> 

> 

> I have a Piet with motorcycle tires.

> Do these tires make a difference during landing as opposed to regular aircraft tires? I can do a perfect wheel landing. As soon as I lower the tail it is all over the runway, in the grass and weeds.

> It is the most unstable, unpredictable aircraft I have ever flown. I fly cubs, Champs, and 365 hp yak50. (Tail wheel) maybe it’s the small tail wheel?

> What am I doing wrong?

> 

> 

>

- The Matronics Pietenpol-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Pietenpol-List

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