Scott Thunderbird. 65 SUPERCHARGED

Actually, I am very familiar with Blowers. Roots, Centrifugal, Compound,, geared, belted, clutched, on a gasoline engine (as in anything from a SBC, BBC, or even a Hemi), an O.S. 1.20 Glow Fuel tiny Monster, or a two stroke GM Detroi Diesel! "But, I ain't ever seen nothin' like that!" The stamped fan, on this thing, looked like an axial compressor in a turbine! Well, if you stamped one out of sheet aluminum.

CT

Wow, just read my first post, I'll try to NOT post without my reading glasses on, ever.

The stamped fan, on this thing, looked like an axial compressor in a turbine! Well, if you stamped one out of sheet aluminum.

Here is the only pic I could find of this thing's innards:



I believe it said 1946-1947. I can't see where the porting technology is anything special....   But,  maybe the forced Induction would bring the power up to comparable levels? I just don't know enough about how it's made nor what kind of boost they expected or actually accomplished! I was hoping Mr Ken Cook, Kim, or even 1/2A Nut would have some insight into something that exotic!
CT

Looking at the first photo.. I see what looks like a "spark-plug".. which would make sense for the mid 1940's. What I don't see; is any type of ignition-support parts like a "breaker-point" set-up on the engine.. for timing-advance/retard. Compressor technology did exist back then.. but it's hard to say whether it was successfully applied to a model engine. We need an exploded-view of the crankcase for a better understanding.

I found these images on the web from Worthpoint.. but they're not much help. I "do" see now; what looks like the breaker-point set-up..  

I should have posted this Link:

https://www.ebay.com/itm/204723403912

I was unable to find any exploded diagrams.  

SAITO used a two chamber drum/rotor/valve/crankcase/double sided carburetor feeding to a separate chamber "THINGIE" monstrosity they called a supercharger on their .90 four stroke supercharged engine.
O.S . used a "Roots Style" (think Blower like you see on a Top Fuel Dragster) supercharger in their 1.20 Surpass supercharged engine. Machined to such tight tolerances that "You WILL damage it, if you disassemble it." It has two straight, hollow, and very short lobed rotors being driven by gears. The whole Blower/ carb/pump/ assembly bolts onto the back of the 1.20 ci four stroke. IIRC it had slightly lower compression to counter detonation.  I think it would be nigh on impossible to overdrive the Blower, in order to increase boost. (Which was my first gearhead thought)  More Power! ^insert simian grunts^
Even the SAITO craziness makes sense with it holding pressurized fuel/ air mix in the box from one down stroke to the next down stroke and feeding the doubled f/a volume at a higher pressure on the that intake (2nd) down stroke.

I originally thought it would a centrifugal compressor, driven at exactly engine rpm. But, the description says it is just mounted ahead of that rotor/drum valve:



I just can't see how it makes pressure with it just inside the case.  I agree, roddie. We. Need. An. Exploded.  Drawing. Even better would be a slow motion  teardown video or slide show! Well, it has gone above what I would risk on it. I just want to learn how it works and turn around sell it for cost plus shipping.  I would never have an airplane that would  justify my purchasing it. I hope someone on here with deep pockets will win it and post it up here!

CT

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The cam is at the rear of the propeller in the engine case the breaker point adjustment system is at the rear ... There is also a more advanced nitro engine With very similar technology a fan behind the crankchaft But this engine is designed for cars which has a similar system to improve suction, a type of super charge. Or so call turbo Maybe they took the idea from this engine It's a very cool engine.