RE: Honda GX-31 and Giant Eindekker??
Thanks. I think it will fly alright. I was getting 6900 to 7000 on the test stand with an 18 x 8 prop. I think I may try an 18 x 6 to fly it. It has about the same power as my brother's unmodified Ryobi, and it flies his 14+ pound Ryan's Rebel just fine. It will loop from level flight at just over half throttle.
We'll see....
AV8TOR