George Lendich wrote:

Paul and Bill,
OK I will explain a few things on the bellhousing so that you can understand what conclusions, both Butch and myself, came to.

I will start from the centre - although it has a solid centre on the pattern, this will be cut out to facilitate the Tracy PSRU, which will be fitted in a machined recess in the back of the face
ring. The machined recess will take the plate that Tracy's RSRU is bolted-on.

The Aussie PSRU will fit on the front of the face ring with the same bolt pattern - yet to be determined (this is Butch's area of  expertise and responsibility).

The whole face will be machined, the Face Ring the 3 Aerobatic stiffener bolt positions top one and two bottom ones, as well as the 4 on the sides which support the housing as it is being machined
at the back ( mounting to engine face). The 4 on the sides will be machined-off when the eye-brows are machined.

The different starters have slightly different lengths and can be accommodated by machining the eye-brows height to suit. Still looking for that smaller foot-print Doug!

The internal starter thickening pads, speak for themselves, although the RH one will be spot milled to accommodate the bolt spacer in that location.

The bottom tail feathers will be cut off for most installations unless you can find another use for them - this is for the 6 O'clock starter position
for those who require it - so to is the internal thickening section ( internal bottom).

The Motor Mount (MM) sides have a flange with stiffeners for the machining ( hold down) process. These will be machined-off square to the housing.

There are a number of different Motor Mount (MM) configurations, long short, high, low - take your pick!

We have made it as flexible as we can and we are working on the best method to do the narrow ( limited width pusher) version with the 6 o'clock starter position. Although the sides can be cut off
with this model and a plate welded-on,  there is a concern of possible warpage due to the heat of welding. This may be done before the machining process and is currently under consideration and
investigation.

Hope that may clarify some questions!

Finally, I would like to say on behalf of Butch and myself - you wouldn't believe the work that has gone into this.

George ( down under)

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