Scratch Single-Rotor 23" 6.5 Ounces - Page 28 - RC Groups
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Jun 05, 2014, 01:49 PM
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flypaper 2's Avatar
Thank you very much!! I think I read where you had some expo in there too.??
Should be able to test fly it tomorrow, weather providing.
Thanks again.

Gord.
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Jun 05, 2014, 02:40 PM
Flying...Pushing Air Down
sr71fan's Avatar
Had 50 or 60 percent expo... can't remember... getting old.
Jun 05, 2014, 04:13 PM
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flypaper 2's Avatar
OK. Thanks much.

Gord.
Jun 22, 2014, 10:05 AM
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flypaper 2's Avatar
Finally got 'er working right. It is overweight at 8 oz. and ended up putting in a bigger motor. Made all the difference, as before with the Blue Wonder, it would barely climb and when turned, it lost too much altitude. With the BP motor and 800 to 1300 ma 3 cell batts., it now does consecutive loops and rolls. I put a wider track landing gear that helped it from rolling over too easy on the ground. Very happy with it. Thanks for a great design

Gord.
Jun 22, 2014, 12:36 PM
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sr71fan's Avatar
Video please!
Jun 22, 2014, 08:55 PM
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flypaper 2's Avatar
I think a buddy got some video today. I'll beat on 'im for it. Too much fun.
Still feeling out what it can do. Almost flies like the old two channel planes with rudder and throttle only. I had her going with a lot of throttle and elevator, going along at walking speed. Still seeing what it's capable of. Very satisfied with it.

Gord.
Jan 10, 2015, 06:37 PM
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adgnade's Avatar

Jag-4


Here is my attempt so far.
Mar 07, 2016, 02:23 PM
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Is there still any activity in this thread? I just finished my Twirl and am looking for inspiration to create a single-rotor AG.
Jun 30, 2017, 09:46 PM
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Cantaloupeman's Avatar
Quote:
Originally Posted by sr71fan
After watching and flying Michael Connally's modified Twirl a couple of weeks ago, the autogyro bug bit me again.

This one has a Bluecor fuselage, Protection Board III tailfeathers, and Depron blades. A 1300KV Blue Wonder motor on 2S 460 and a 9/4.7 prop is twice the power it needs to fly.

Since the wind always blows here, I had to wait 'til almost Midnight to get in a test-flight. A local church parking lot seemed like a good place. I was pleasantly surprised when it lifted off gently and began to climb. Lots of trimming, and a CG adjustment (battery) later, I put on my hat camera for some video. This is flight #3...

Can't wait to try it out in calm daylight air!

Gary

http://www.youtube.com/watch?v=4nqe7...eature=channel

I have your plans but im a bit confuse as to the original size of the ag3. The templates for individual pieces are bigger than the original reference plans. Which one is "correct" for lack of a better word. Also what do you recommend using for landing gear? Carbon rod probably but what thickness? Thanks!
Jun 30, 2017, 09:48 PM
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Cantaloupeman's Avatar
Quote:
Originally Posted by flypaper 2
Finally got 'er working right. It is overweight at 8 oz. and ended up putting in a bigger motor. Made all the difference, as before with the Blue Wonder, it would barely climb and when turned, it lost too much altitude. With the BP motor and 800 to 1300 ma 3 cell batts., it now does consecutive loops and rolls. I put a wider track landing gear that helped it from rolling over too easy on the ground. Very happy with it. Thanks for a great design

Gord.
Take a look at my last post on this thread. I specifically quoted gary but maybe youll be able to answer my question as well. Also what exact motor did you use?
Jun 30, 2017, 11:44 PM
Flying...Pushing Air Down
sr71fan's Avatar
Cantaloupeman,

I don't remember having any plans, but none of the measurements are critical. The motor I used originally (AG-1?) and on all subsequent versions was a hexTronic 2730-1300 Blue Wonder from Hobby King. If I were to make another one today, I would use the same motor but higher, 1500KV. This provides dazzling performance on 2S.

Happy Flying!

Gary
Jul 01, 2017, 06:22 AM
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flypaper 2's Avatar
Too far back to remember what motor I had but the Blue Wonder will work fine if you keep the weight down to what they call for.

Gord,
Jul 03, 2017, 01:12 PM
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juzchillin's Avatar
Hello
I'm trying to help a fellow member with this build

My question is was the original fuse and v2 the same or was v1 a little smaller ?

Thanks in advance
Aug 20, 2017, 06:00 PM
Registered User

Successful maiden and a question


My first experience with an autogyro was an Auto-G (1) that I modified successfully to use a 4 bladed rotor head with non-profile, flat depron blades https://www.rcgroups.com/forums/show...postcount=2376

Now, two years later, I found the plans of Gary’s AG3 – and gave it a try. Though I did not yet glue the lower fuselage, and did not mount any landing gear, I wanted to risk a test fly. From the hang angle I thought to have the correct CG and hand launched it into our strong wind today. Disaster! It flew like on a rollercoaster – rolling upside down, turning sharply, flying against me. Hardly controllable. Somehow I brought it down. Only the nose was crunched and cracked a little bit – but instantly repairable with some strong tape. My colleagues told me that my AG3 looked very tail heavy in flight.

To make an exciting experience short, I moved the battery forwards in several steps and the flight performance and control increased from test to test. Finally the 2S, 450mAh battery was moved more than 10 cm forward to end up directly behind the motor, together with additional nose ballast of 13gram of lead. But now my AG3 flew like a charm Very good control. Flies right and left circles without problems, using rudder and elevator, and counter-roll to hinder it from banking too much. I could hover it in the winds and had no further problems with touch down. GREAT FUN !

I was surprised how quiet my AG3 is in the air. The motor and prop noise is so low, that I clearly could hear the rotor blades. Very nice.

A big THANK YOU for publishing this design and drawing these plans! I am impressed about the simple, and inexpensive build and the efficiency of those flat rotor blades. (Though blades with the correct airfoil will be much more efficient – but need more effort and knowledge to be built correctly.)

My AG3 weighs 193grams. The AUW is 218grams (including the 13g nose-lead and the battery).
I use a hexTronik 24gram Brushless Outrunner, an 8”x4” prop, and a 2S, 450mAh battery. The flight time is only 2.5 minutes. Then the motor is hot (it even smelled strange) and the battery is really drained. I recharged 457mAh!

Is this the wrong motor or the wrong propeller?
Aug 21, 2017, 11:31 AM
Registered User

Gyro Motor Prop and Blades


Previously we learned that for their size, gyros need a different power system than a similarly sized fixed wing airplane. Gyros are like pulling a large trailer with a small car. You need power to pull because of the drag or weight and you need it in a lower gear. It takes a lot of work for that power system that would be perfect for the same size fixed wing airplane to pull that draggy gyro rotor through the air! That's precisely why the motor gets hot...its working very hard. You need a motor that turns a larger prop at a slower speed. You need to increase the prop to a 10" prop with a lower pitch, and replace the motor with a motor that has a lower Kv, say in the 750-1000 range.

Ralf, the above is an quote from my post #71 in the thread: https://www.rcgroups.com/forums/show...rototype/page5

Also, you may want to take a look there for my easy method of making thicker airfoil foam blades. We abandoned flat blades years ago due to their unacceptable poor performance. Also, If you can smell the hot motor, you are on the edge of destroying it, as the insulation on the windings is melting!

Cheers!

Russ


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