Wye Frog Angle

[eric220]

Simple question.  The Atlas wyes are labeled 2.5 and 3.5.  How does that translate to the angle of the frog or the rate of diversion?

[davefoxx]

Eric,

I think the 2.5 wye is the equivalent of a standard #5 turnout and the 3.5 wye is equivalent to a standard #7 turnout.  The frog number is halved, because both legs diverge with a curve away from an imaginary centerline.

Hope this helps,
DFF

[Zox]

Simple question.  The Atlas wyes are labeled 2.5 and 3.5.  How does that translate to the angle of the frog or the rate of diversion?

The formula is the same as a regular "number X" turnout--"X" is the distance the track moves forward for each unit distance of diversion.

However, with a wye, each leg of the wye accounts for half of the diversion. So a #2.5 wye is made up of a #5 left-hand diverging track and #5 right-hand diverging track. Similarly, the #3.5 is a #7 angle on each side.

[wcfn100]

However, with a wye, each leg of the wye accounts for half of the diversion. So a #2.5 wye is made up of a #5 left-hand diverging track and #5 right-hand diverging track. Similarly, the #3.5 is a #7 angle on each side.

It's possible to have non-equally diverting legs.  My Waterloo module will be getting a #10/#7 wye which will use a #8.5 frog.


Jason

[eric220]

I knew that the answer would be one of those facepalm-of-course moments.  :  Thanks!

[Coxy]

It's possible to have non-equally diverting legs.  My Waterloo module will be getting a #10/#7 wye which will use a #8.5 frog.


Jason

Post pics of this one - sounds interesting.

[central.vermont]

I knew that the answer would be one of those facepalm-of-course moments.  :  Thanks!

[eric220]