It's really great work and fun to watching!! I found your channel just an hour ago and you made my day! I hope your skill make this world more fun or great than today! One day not long time later, I dream your engine will be famous around the world! I'm Japanese and not fluent English so please don't be strict about my words even if my sentences or something was wrong>< At least I'm positively writing this comment. Thank you for showing amazing skill and uploading enjoyable video!
A thought regarding propellers. Often with free flight models, low pitch propellers (3", 4") are used so that a larger diameter propeller can be used - giving more thrust. But since your motor is turning only 6000 rpm at best, low pitch propellers may not result in a flying speed greater than the stall speed. On a 4" pitch prop 6000 rpm is only 23 mph and 3" pitch is only 17 mph. A Cox .049 on a 6x3 might be doing 15,000 rpm. But even at 12000 rpm the "pitch speed" of 34 mph would clearly be above the stall speed of the model and thus viable for flight. Since your motor seemed to like larger props, perhaps you could find a 6" pitch prop and give that a go ...
That is the Spirit that I live for !!! Spent years in Robins garage as I watched and learned the Art of Aeromodeling ... keep it Going you gotta know how much we all learn from you ...
This is myone and only goal with home machining: Building practical tiny engines. You're livin' the dream! Once I get done with my 71 C10 project I might start buying up some tooling to start down this path.
As far as i know it's not produced as a kit anymore, Mine is scratchbuilt and the plans are available on outerzone, and you can get a printed copy from the AMA plans service if you're in the U.S.
I thought the same, i tried a 6X3 but it barely ran and was super sensitive to the needle. it actually runs the best, and fastest(?) on the 8X4. i suspect it's due to the port size and arrangement, it can't breathe well enough to break past around 6000 Rpm
@@terrymoorecnc2500 My supposition is that it's not got quite enough transfer port area - it was also designed in the late 40's, with a long stroke and fairly heavy rotating assembly. it actually turned faster, with a larger prop lol. with the turbo plug it barely ran on a 6X3. I was thinking of making the transfer ports bigger and reducing the weight of the piston assembly but i think i'm gonna put this one on the shelf for now, i've got lots of other things i want to work on.
