You're correct, if you land hard you may have a problem. I sometimes fly off of very rough grass fields. With a springy tail gear the tail can bounce up further on taxiing, than it would when it was accelerated and lifting for take off.

You need to look at your particular setup and figure your prop clearance accordingly. With the Ohio Tail gear being so stiff, but higher than the stock unit, flying off pavement with a 14 or 15 inch prop isn't much of a problem, unless you set down really hard on landing.
I tried a 13X6 and 13X8, but felt the engine was revving too high with such a small prop.

I compromised and settled for a MAS 14X6. The engine is revving to nearly 10grand on this prop. I am afraid that in the air it will go much higher, so I set a really broad power curve on my 9Z to prevent accidentally over revving.

Of course, the proof of the pudding will come, whenever the weather lets me test fly it and see how it goes. I did remove the wheel pants and installed a little larger, stronger main wheels and smaller tail wheel to enhance using the 14" prop. The brown truck brought me a new GB Obsession last Saturday. Nearly have it finished. Waiting on a 8611 servo to come for the rudder. Once that's in, it will be ready to test fly too. Weather man forecasting rain and wind again this weekend, so don't know when I'll get out my first flight reports. I have three new planes in the hangar waiting test flights.

Don't trust the stock wheels, both of mine failed the first time out. The plastic on one just shattered during take off attempt. May have had a piece of debris get kicked up into the whell pants, but they didn't show any indications of such.

Hope you are having better luck with yours than I have had with mine so far.

Mike Boyd
AMA 7197