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Old Apr 29, 2015, 11:04 PM
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Open minds Steve lol!
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Old Apr 30, 2015, 08:01 PM
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I'm breaking-in helis.
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Originally Posted by Steve_ View Post
...Mass collection of geniuses mixed in with a few crazy people
to spice things up.
yes, that's me in bold and underlined!!
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Old May 02, 2015, 05:03 PM
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700 size coax? That would be interesting to see in action.
This is a little larger than 700 but..

Sikorsky S-97 RAIDER Begins Bladed Ground Runs (1 min 39 sec)
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Old May 02, 2015, 11:15 PM
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Yep, that is pretty close to what I had in mind. Dual tri rotor heads, and a counter rotating prop out back. Speed runs man. The battery layout would consist of two 14 to 16s flight packs running up top on each side of the fuse for high cog. Two esc's laid out much like the new Velos, which I had penned out before that even hit the headlines. Skookum 720 black using a gyro mixer that was designed by OlliW, Jeti telemetry and a separate motor out back to push the rear prop to its limits.

One thing about coaxial cp, they can almost flip on top of themselves since the axis of rotation is based more 'between' the upper and lower heads. With a secondary effect with outside cog. The upper head can also tilt, adding more force to swash lean than a singular swash, so rolls can be almost violent. Piros are literally insane since the full torque is being applied right to the main shaft. As are repair costs if a guy dumb thumbs it.

Troy is still in possession of a prototype 500 dual tri rotor cp coax head I sent him a while ago that I wanted to field test before moving up into the 700 build. That head alone cost more than some guys helis. The drive train is equally complex. Which lead into my research into dual belt drives btw.

Which brings up a thought totally unrelated. Troy, what about auto's with your direct drive if anything goes awry?
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Old May 03, 2015, 02:20 AM
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There's a video around on YouTube of a fairly large scale one coax in a flight show. I've seen that one, very cool. There's just something fascinating about two giant sets of counter rotating blades. Interesting that one has a tail prop. It's probably better for forward speed, but it would look cooler without it.
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Old May 03, 2015, 06:47 AM
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Quote:
Originally Posted by Luvmyhelis View Post
Yep, that is pretty close to what I had in mind. Dual tri rotor heads, and a counter rotating prop out back. Speed runs man. The battery layout would consist of two 14 to 16s flight packs running up top on each side of the fuse for high cog. Two esc's laid out much like the new Velos, which I had penned out before that even hit the headlines. Skookum 720 black using a gyro mixer that was designed by OlliW, Jeti telemetry and a separate motor out back to push the rear prop to its limits.

One thing about coaxial cp, they can almost flip on top of themselves since the axis of rotation is based more 'between' the upper and lower heads. With a secondary effect with outside cog. The upper head can also tilt, adding more force to swash lean than a singular swash, so rolls can be almost violent. Piros are literally insane since the full torque is being applied right to the main shaft. As are repair costs if a guy dumb thumbs it.

Troy is still in possession of a prototype 500 dual tri rotor cp coax head I sent him a while ago that I wanted to field test before moving up into the 700 build. That head alone cost more than some guys helis. The drive train is equally complex. Which lead into my research into dual belt drives btw.

Which brings up a thought totally unrelated. Troy, what about auto's with your direct drive if anything goes awry?
There is a OWB built into the final stage planetary carrier, inside the transmission. A pulley on the mainshaft will drive the belted tail. She'll auto with the best of em...*grins*
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Old May 03, 2015, 08:42 PM
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Ahhh, (light comes on) now that is cool.
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Old May 04, 2015, 06:57 AM
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I'm breaking-in helis.
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it's a little bigger than on mine. Looks good, man.
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