Hey Bucky,
    I've been wanting a vert ramp since I was a kid and now I have a chance to build one in my own yard.
I was going to go with 10ft trans with 1 foot of vert and I'm not sure how big to make the flat bottom.
I was thinking about 14 ft.  I know if it's too big I'll loose speed and air, and if it's to small It probably won't be very fun.
Any suggestions? If anyone else has a suggestion please let me know.

                            Thanks,
                                        Mike