In article ,
Vaughn wrote:

"Mark James Boyd" wrote in message
news:40252ec1@darkstar...
Vaughn wrote:

That said, a slip/skid indicator costs a whole $45.00 at Wings&
Wheels
and there is no reason for any trainer to be without one.

I wonder if one can get an experimental version at
Orchard Supply for $2.35...

I have seen bubble levels used, they work in the opposite direction
from a slip/skid (same as the yaw string), are excessively sensitive, but
the one I flew with seemed to agree with the yaw string.

Vaughn

www.aircraft-spruce.com $34.

but the real long, sensitive ones at store.wagaero.com
look about in this price range too, and a selection of 5...