This whole idea started with the USRA Giant Scale pylon guys opening up a class for the 80" H9 Sundowner.

I put a plane together just in time for the class to be eliminated (since H9 stopped making it)

So, a big plane, a big engine, and now what?

We go faster for the hell of it (hopefully)

I've made friends with one smert fella down in AZ that owns a machine shop and took to seeing what it takes to wring out a Moki 210. He's had quite a bit of success. A 16x14 APC at 9600rpm on 60%nitro isn't too shabby! Tore the wings right off the plane one afternoon.

I've essentially duplicated his engine. (he was kind enough to share the notes with me) Although I'm at roughly half the elevation I've never been able to get the RPM he was/is so I've taken another tract. I too own a machine shop. . .

The positive displacement blower project begins. . . I spent a few hours on the phone with engineers from Whipple, Eaton, B/M, and Blower Drive Service. I've gotten a good understanding of what needs to happen now. I've got my bearings, gears, drive belts, and a few CAD doodles. I've also aquired materials.

Here's the basic rotor geometry: Rather than invest a huge effort into a helical rotor setup that is much more complicated to make I'm first going to keep this simple by machining a straight two lug rotor setup.

Here's a few pics as I'm running the rotor program right now as we speak

CAD doodles



chunk of 7075 T6 certified aerospace forged billet aluminum.


Some tool paths. Doesn't look like much yet as I have to get the bulk of this out of the way first. It'll start to make sense here soon enough.






More to follow.


Chad