Scratch Single-Rotor 23" 6.5 Ounces - Page 2 - RC Groups
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Mar 06, 2009, 03:27 PM
Sleepy Hollow, IL

Build Has Started

I have started the build already and have all of my foam cut (see picture). Need to now cut some CF for the blade stiffeners.

I am guesing that the blade angle in the center hub is about 7 degrees. My hub block is 2 inches square and 5/16 inches thick. The blades are each 10.5 inches long and 2 inches wide.
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Mar 12, 2009, 06:10 PM
Sleepy Hollow, IL

Finally finished the autogyro based on your design and information. Soon as the weather warms up I will be giving it a maiden flight.

Setup is as follows:

BP2112-19 Motor
GWS 8x4.3 prop
Turnigy 10A ESC
GWS Nano 4 channel RCVR
2 HXT -500 servos for R & E
1 HS-55 servo for rotor tilt

Put on large wheels and a tail wheel to help run through the grass in my back yard. Weight without battery is 5.5 ounces.

Will post results of the maiden when it happens.

Mar 12, 2009, 07:23 PM
Flying...Pushing Air Down
sr71fan's Avatar

Hey, that looks pretty good! A lot better than mine! Hope you get to fly it soon. I'm already thinking about a new and improved version. BTW, I'm happy to report that I looped mine several times at the TINY event last weekend and did some autos, too. I hope someone got video of it. It comes down really fast. My next one will have a bit larger rotor.

Happy Maiden!

Mar 14, 2009, 02:26 PM
Sleepy Hollow, IL

Had some problems on my maiden.

First was trying to roll through the grass in my back yard. Still a little too high from last year and not really flat enough.

Second I was not able to spool up the rotor to speed and all of the take offs were aborted flip overs.

The wind was just about non existant and the rough ground made it all to hard.

I have a twin rotor Twirl that seemed to fly alright. Overall the rotor tilt angle is less on the twirl. I am not sure how much difference that makes.

Mar 14, 2009, 05:02 PM
Flying...Pushing Air Down
sr71fan's Avatar

Those single-rotors are much more difficuilt than the twins. That's why more people build the twins. Keep trying, and once you find the right tilt angle (L-R), it'll go a lot smoother. Find a smoother runway, like a parking lot, or deserted road, so your takeoff run will be smoother. Don't give up!

Mar 16, 2009, 07:52 PM
Flying...Pushing Air Down
sr71fan's Avatar

Outdoor Loops!

I finally had a chance to do some more outdoor flying today. Here's a short video...

Autogyro Single-Rotor Loops (1 min 14 sec)
Mar 16, 2009, 08:36 PM
Registered User
Good show, Gary !!! Looks like fun !!! Charlie
Mar 16, 2009, 09:36 PM
Registered User
It looks like that things flies great. Enjoyed the video of a single rotor foamy flying. I have one built, but have not flown it yet (weather, fear, all of the above). Good job on the aircraft.

...somewhere in Indiana...
Mar 17, 2009, 12:12 PM
Flying...Pushing Air Down
sr71fan's Avatar

New Rotor... 3-Blade

I tested a 3-blade rotor on the same airframe last night (under the street lights at Midnight). This rotor is one inch larger in diameter, same chord blades as the 4-blade, and flies much better. Maybe it's not as draggy. No videos yet.

Mar 18, 2009, 11:24 PM
Just another Pilot
Gary, you never fail to amaze me KEWL stuff! Oh and after a year + break from the hobby, I am getting back into it a little.

Mar 19, 2009, 12:24 AM
Flying...Pushing Air Down
sr71fan's Avatar

3-Blade Rotor

Hi Ken!

That's great news! Glad to hear you're back. I'm still having fun, as you can see.

Here's a video of some flights today with the 3-blade rotor...


AutoGyro 3-Blade Rotor Test-Flights (3 min 30 sec)
Mar 19, 2009, 04:14 AM
Registered User
PeterO_UK's Avatar

That was some nice flying in that wind

Mar 19, 2009, 03:17 PM
Flying...Pushing Air Down
sr71fan's Avatar
Thanks Peter!

Around here, if you want to fly outdoors, you gotta accept the wind.

Mar 25, 2009, 09:01 PM
Lost in the Sky
Richard N's Avatar

Comparing rotor tilt versus rudder, which do you find more effective?

I have a LA Heli Cierva that is a single rotor with only two axis controls tilting the rotor head side to side and back and forth. Some builders have added a rudder. I am considering adding elevator too and trying to fly it like my Pisces where the rotor is fixed and you control pitch and yaw with rudder and elevator.

Mar 25, 2009, 09:29 PM
Flying...Pushing Air Down
sr71fan's Avatar

I find the rotor tilt and rudder equally effective (for roll and yaw, respectively). When I choose to fly with them coupled (flip a switch), the model becomes very responsive.

I have no experience with the DC head, so you're on your own in that regard.

Good luck with your project, and please post some pics!


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