Here's a coaster from me that took some fine-tuning.
Whatever happened to the shuttle loop? No one seemed to pick up the concept or even make a variation - until the Boomerang. But, no one thought to revive the simple launch, loop, spike, loop, spike.
Designed by me (not Intamin, but the track looks like it ), the new-age shuttle loop jacks up the speed to 65mph, has two 160-foot spikes, and a holding brake on top of the back spike. The train pulls an intense 5Gs through the loop, and each spike is pitched at an angle beyond vertical. The new-age shuttle loop uses LIMs to accelerate the trains.
New, better track - same timeless Schwarzkopf loop.
shuttleloop.nltrack
The evolution of the shuttle loop.