Go Back  RCU Forums > RC Helicopters > AutoGyros
Experiment autogyro build log >

Experiment autogyro build log

Notices
AutoGyros All about autorotational flight, sport and scale autogyros! User friendly!

Experiment autogyro build log

Old 09-10-2013, 09:05 AM
  #1  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default Experiment autogyro build log

Ok, guys, this is the story. I've had a couple of gyros, both DC head. Then I tried to convert a plane fuselage into another gyro, with the expected disastrous outcome. Well, a couple of weeks ago I made a mockup gyro out of foamboard and although it flew ok, the structure was weak in torsion and it ended up breaking apart. So I decided to draw and build my own. Ive spent this week drawing, framing up the fuse, and building the column. Next will be to make the tail and gear, and finally the blades. The head will be the same from the mockup, which I made from a homemade plate of carbon and fiberglass. A word on weather, here in Abu Dhabi I went to fly the foamboard version at noon one day, and the black head got so hot that it got weak and the blades started drooping ever closer to the fuselage. Scary stuff, hehe. Well, I hope you like, and off course, I hope it flies
Old 09-10-2013, 09:46 AM
  #2  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

Fuselage is atandard truss construction, column has an inner birch ply base, then balsa structure and planking.
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	170
Size:	184.1 KB
ID:	1918935   Click image for larger version

Name:	image.jpg
Views:	182
Size:	167.9 KB
ID:	1918936   Click image for larger version

Name:	image.jpg
Views:	168
Size:	164.4 KB
ID:	1918937  
Old 09-10-2013, 08:41 PM
  #3  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

This is the head. It's Carbon and fiberglass sandwich, as I said, with regular 30min epoxy. I'll strengthen it a bit with ply, only leaving a gap to flex, as right now it's too bendy, specially when hot. Also, I'll try some 5 degrees to the flex, so the advancing blade will get a bit of down incidence. I', not using bearings, it's just a 3/16 music wire inside a brass tube, with washers and graphite as a lubricant. Yes, plain old pencil dust, it's the best dry lube, and dust and sand cant't get stuck
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	179
Size:	224.8 KB
ID:	1919104   Click image for larger version

Name:	image.jpg
Views:	163
Size:	210.2 KB
ID:	1919105   Click image for larger version

Name:	image.jpg
Views:	167
Size:	239.8 KB
ID:	1919106  
Old 09-10-2013, 08:46 PM
  #4  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

This attachment system I think is brilliant, and I borrowed it from Jim Baxter's Twirl design. Basically the column goes in rails and is then screwed from the bottom. It looks great inside and out.
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	170
Size:	218.6 KB
ID:	1919107   Click image for larger version

Name:	image.jpg
Views:	147
Size:	256.7 KB
ID:	1919108   Click image for larger version

Name:	image.jpg
Views:	149
Size:	235.9 KB
ID:	1919109   Click image for larger version

Name:	image.jpg
Views:	156
Size:	260.1 KB
ID:	1919110   Click image for larger version

Name:	image.jpg
Views:	146
Size:	268.4 KB
ID:	1919111  
Old 09-15-2013, 10:17 AM
  #5  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

Well, this is my progress. It's looking sadly similar to everything else, but apparently there's a reason for that. We'll see. No interest out there for the project, but I'll continue to post anyway
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	194
Size:	209.6 KB
ID:	1920930   Click image for larger version

Name:	image.jpg
Views:	186
Size:	212.6 KB
ID:	1920931   Click image for larger version

Name:	image.jpg
Views:	192
Size:	177.8 KB
ID:	1920932  
Old 09-15-2013, 10:21 AM
  #6  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

This is the reinforcement I made on the head, some screws are missing.

I'm a bit worried about the weight of the model, as the loading is going up to almost 4oz per sq ft. Thoughts?
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	180
Size:	222.3 KB
ID:	1920935  
Old 09-17-2013, 02:39 AM
  #7  
My Feedback: (1)
 
Join Date: Dec 2001
Location: Lakeland, FL
Posts: 838
Likes: 0
Received 0 Likes on 0 Posts
Default

Looks like it will fly to me..Better fly at night or early in morning so it will not melt.

Jim
Old 09-23-2013, 02:13 AM
  #8  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

This is the milling setup that I am using for the blades. At least they all end up fairly similar in shape. And check out my drink, hehe
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	184
Size:	166.3 KB
ID:	1924119   Click image for larger version

Name:	image.jpg
Views:	201
Size:	183.9 KB
ID:	1924120   Click image for larger version

Name:	image.jpg
Views:	210
Size:	199.6 KB
ID:	1924121  
Old 10-15-2013, 10:46 PM
  #9  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

Well, guys, an update. The project was a huge failure. After several attempts and flip overs I decided to just hand launch it, it just stalled upwards and fell to the left. At it was made out of sticks, that's pretty much all that was left. So it's back to the board
Old 07-29-2014, 06:00 AM
  #10  
Senior Member
Thread Starter
 
colmo-RCU's Avatar
 
Join Date: Aug 2003
Location: Bogota, COLOMBIA
Posts: 322
Likes: 0
Received 0 Likes on 0 Posts
Default

Ok, guys, the design was a huge failure; the gyro didn't even leave the ground, it would immediately flip to the right, I'm guessing too much "up" on the disc, and the disc was way too big for the bird, specially the stabilizer. So, deciding to start over, the only things I am keeping are the mast and the blades. My dad has a laser CNC in his factory, and a lathe at home, so in my last visit we got to work. I made some plans, we cut the parts an I just finished assembly and paint. I'm very happy with the result, the blades now flap mechanically and are hinged properly. The hub is aluminum, turned at home, and inside it has two 4x12mm ball bearings. I can't seem to find the thrust bearing I need for the top, but a couple of nylon washers will do for now. Check out the process and the result.


Mariano
Attached Thumbnails Click image for larger version

Name:	image.jpg
Views:	146
Size:	940.8 KB
ID:	2018279   Click image for larger version

Name:	image.jpg
Views:	148
Size:	135.3 KB
ID:	2018280   Click image for larger version

Name:	image.jpg
Views:	151
Size:	182.9 KB
ID:	2018281   Click image for larger version

Name:	image.jpg
Views:	160
Size:	145.4 KB
ID:	2018282   Click image for larger version

Name:	image.jpg
Views:	159
Size:	143.3 KB
ID:	2018284  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.