Topband: Calculating top loading wire lengths?

[Mike & Coreen Smith]

Came home to find my "improvised" 160m inverted L folded over like a pretzel 
today, so must rebuild once again.
(It was part 40m freestanding vertical (small diameter aluminum), part top 
loading wire, #12AWG stranded, insulated)
(gotta love that ice/wind/freezing rain and snow we get here....the News 
described todays weather as a "weather bomb")

SOmewhere I had stashed the formula away for safekeeping, but seems I kept 
it too safe....even from myself

Anyways, I am contemplating temporarily graphting some pipe together and I 
think I can get close to 63½' tall(about 1/2 size vert), so what lengths do 
I use for the 3 top loading wires? They'll likely have to come down at close 
to 45º angle unfortunately unless I can get creative with far far away 
endpoints.

 I have a large Air-Variable Cap I can use to base match, so if I am a wee 
bit long, that's fine.  I may even add a small DC motor to it so I can move 
around the band a little bit.

Already have lots of buried radials.

Hope to see you all in the STEW and CQ160....

Thanks in advance !

Mike VE9AA