Hi Jim,
Thanks for sharing. I'll take a better look at this when I'm at home. (We're firewalled from video here!) But going on the numbers, I'm interested.
I'll share my GT-1 layout, which I love. I'm about 420 RPM and getting it lower slowly. MY PAP is 4¾ x ¾ up.
Warning to all you strokers out there. This probably won't work for you, unless your lanes have tumbleweeds rolling over them and you still want to go straight!
I went the other way a bit over a year ago and laid out the 2½" pin GT-1 triple arc, pin 5 5/8" to PAP, derived MB 2¼" to PAP. Angles are 30° x 5 5/8 x 70°. With my 4 29/32" span and PAP mentioned above, that gets the pin just south-west of my middle finger, with the CG just into the positive and derived MB on the VAL, 2¼" below the PAP. (See below.)
Attachment:
GT-1-1.jpg [ 64.22 KiB | Viewed 378 times ]
At 2-4000 surface, (some surface is critical to this layout) this ball is super clean through the front and just sits on the midlane, followed by a tight arcing backend. It hits like a truck. When it hits anyway. As you can imagine, any ball storing that long isn't wild about the long wet stuff. It's a handy piece for playing out or blending our BHS (blocked house shot), although I must admit I don't like wasting it on league.
An interesting quirk is that the low diff ball and layout combo with a strong cover makes it ideal for playing sport shots when they get a bit of a track burned in, as I can play
right to left with my hand straight up and backed out a bit and it's unreal. Averaged 240 for the last 4 at an event on Autobahn in Sydney a few months ago once I worked out that little trick as there's no squiggle when you're pointing 9 board! Felt like I was a kid with plastic again, except that the deck just exploded on impact!
Back on topic, though. I wonder how this layout modified with a larger drilling angle would go on a C-51 for the higher rev "midlane-challenged" player? My current C-51 is 55° x 5 x 50° and is great until the mids go or I need to move deep. Probably answered my own question as the current one is in danger of clipping the thumb - on the backend from track flare.
