I have seen some pictures of these, and would like to track down a source of a currently made one.
The pictures look quite small capacity, with cox thimble drone or babe bee cylinders and heads. - less that 10ccs for 3
at 0.8 ccs, that would be 2.4 ccs.
The Saito 3 cyl 15 cc 4-stroke is a bit heavy at 890g, but makes quite good thrust. also expensive, at $749 NZ, and out of stock!
My weight budget is around the 500 g mark (2 motor, electric, plus battery.)
Any ideas? 130-150 mm diameter sounds good, too. I estimated the saito at x 6 of the bore at 22 mm?? a typical 15cc 2-strike single is about 3.2 inches
ctr to top, but 10ccs of 2-stroke should be plenty. a 14 x 5 prop at 10,000 rpm does 4.1 kgf thrust, 1.3 hp (988w) - this is just about twice as efficient as
2 x 8 x 4.5 props!
The good thing about electric-quite cheap! - about $250 nz for 2 x motors and battery, plus freight.
That is similar to the price for a 2-stroke 10cc glow single cylinder!
I like the sound of triple radials, though.
Maybe not this build, but maybe the next? Radial front cowl, English Electric Lightning-style wings, close-coupled delta t-top tail and elevator,
short nose. maybe 50 inch span, more then 45 degrees sweep,- what area would that be? - probably less that my twin delta canard. That packs a lot of wing into
the space! Getting the balance point right could be a problem, with a heavy front engine?? Maybe a pusher layout- the engine could be in a better
position?? big scoops needed for engine cooling, though.
I suppose the best way to charge them would be a centrifugal impeller on the propeller side?
You would want to use an electric starter to get a good fuel-air flow going.
The pictures look quite small capacity, with cox thimble drone or babe bee cylinders and heads. - less that 10ccs for 3
at 0.8 ccs, that would be 2.4 ccs.
The Saito 3 cyl 15 cc 4-stroke is a bit heavy at 890g, but makes quite good thrust. also expensive, at $749 NZ, and out of stock!
My weight budget is around the 500 g mark (2 motor, electric, plus battery.)
Any ideas? 130-150 mm diameter sounds good, too. I estimated the saito at x 6 of the bore at 22 mm?? a typical 15cc 2-strike single is about 3.2 inches
ctr to top, but 10ccs of 2-stroke should be plenty. a 14 x 5 prop at 10,000 rpm does 4.1 kgf thrust, 1.3 hp (988w) - this is just about twice as efficient as
2 x 8 x 4.5 props!
The good thing about electric-quite cheap! - about $250 nz for 2 x motors and battery, plus freight.
That is similar to the price for a 2-stroke 10cc glow single cylinder!
I like the sound of triple radials, though.
Maybe not this build, but maybe the next? Radial front cowl, English Electric Lightning-style wings, close-coupled delta t-top tail and elevator,
short nose. maybe 50 inch span, more then 45 degrees sweep,- what area would that be? - probably less that my twin delta canard. That packs a lot of wing into
the space! Getting the balance point right could be a problem, with a heavy front engine?? Maybe a pusher layout- the engine could be in a better
position?? big scoops needed for engine cooling, though.
I suppose the best way to charge them would be a centrifugal impeller on the propeller side?
You would want to use an electric starter to get a good fuel-air flow going.
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