Thread: Discussion Scratch Single-Rotor 23" 6.5 Ounces Reply to Thread
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Topic Review (Newest First)
Apr 24, 2022 06:16 PM
sr71fan
Cg
Suspended by rotor shaft, the fuselage will be nose down so the shaft is vertical.
Aug 18, 2020 06:09 AM
wilcowell
CG position on the 2 blade rotor.
Quote:
Originally Posted by sr71fan
I wanted to test a larger rotor on my AG3-2, so I had to decrease the rear tilt of the shaft in order to clear the tail feathers. This is a 40-inch two blade rotor made the same way as the smaller ones with 3mm Depron and a 2mm carbon rod on the leading edge.

What a difference! This is going to be a blast indoors! I have some balancing and tracking work to do first, though. You'll see in the video...

Gary


http://www.youtube.com/watch?v=k7fX4dEMHpo
Hi,
The fly you do with your AG3-2 40 inch 2 rotor blade is verry beautiful. I prepare one for soon,but i am beginner...
So ,could you tell me something about CG position on the plan sheet.
1-Where is the good position to be sure have the same stable beautifull flight like your?
2-In order to have the good balance CG,is the way consist to suspend the main rotor shaft and obtain an horizontal fuselage?
Thank you.
May 19, 2020 07:11 AM
jclassic1 Can you tell me if a rudder/elevator version with a fixed rotor will work and if so would it be necessary to put dihedral tips on the tailplane.
I have read on this forum of somebody successfully flying a RET version and would like to give it a try.

Thanks

John
May 14, 2020 02:10 PM
jclassic1 Thank you Ralf

John
May 14, 2020 08:59 AM
Ralf W. Hi John,
I used 6 mm depron.
Ralf
May 14, 2020 02:32 AM
jclassic1 Hi Ralf,
what thickness foam did you use for your airfoiled blades.

John
May 13, 2020 11:05 AM
Ralf W.
Quote:
Originally Posted by fossil1999
...
1a) Am I correct in thinking that the rotor tilt hinge line has to be parallel with the horizontal fuse?
Yes.

1b) Or is some other angle required for good turning?
No.

2) Does the rotor shaft have to be parallel with the front edge of the mast, or some other angle?
No. But this defines a good value to start with.

3) Does the rotor shaft have to have any "sideways" angle?
No.
May 13, 2020 06:02 AM
fossil1999 Thank you, I have cut out the main parts.
I have some more questions relating to the rotor mast if you don't mind... I want to get this right.
  • Am I correct in thinking that the rotor tilt hinge line has to be parallel with the horizontal fuse? Or is some other angle required for good turning?
  • Does the rotor shaft have to be parallel with the front edge of the mast, or some other angle?
  • Does the rotor shaft have to have any "sideways" angle?


Thank you again.
May 02, 2020 02:11 PM
Ralf W. Yes, that is the correct pdf.
Start with 3 blades. Once you can handle this you may upgrade to the much more agile rotor with only 2 blades.
May 02, 2020 05:39 AM
fossil1999 I finally have my heavy duty servo.
I presume the plans here are the recommended definitive version?
And between the three blade and the two blade rotors, which should I go for as a beginner?
Mar 28, 2020 06:21 PM
fossil1999 Thanks. I will definitely wait for a bigger servo then.
And very impressive flying! I see why the tilt servo is under so much stress.
Mar 28, 2020 02:49 PM
Ralf W. I used simple 17 gr servos (Graupner C341) and I expect smaller servos will not survive the forces to tilt the rotor of this autogyro in roll direction. The motor of my AG3 had a mass of about 25 gr. With this equipment it could fly in some windy conditions.

AG3 Autogyro, bei stürmischen Wind, 03.10.2017 MFG Eudenbach. (2 min 43 sec)
Mar 24, 2020 07:16 AM
fossil1999 Forgive me if this has been answered already...
I'm planning to make this model, but I neglected to order a heavy duty servo for the tilt rotor!
Would I be able to use a nylon 9g servo as it is or would I have to scale model this down? I have 5g servos for the rudder and elevator, and 10g and 15g motors for propulsion.
Sep 19, 2017 01:41 PM
Ralf W.
Quote:
Originally Posted by mnowell129
Put a little more negative shim in the blades. It's likely this will make it spin up faster and you may not have to change the geometry at all.
Thanks! I still have to read and learn a lot, before I will understand how these machines do function.
Sep 19, 2017 06:21 AM
mnowell129 Put a little more negative shim in the blades. It's likely this will make it spin up faster and you may not have to change the geometry at all.
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