SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Mar 26, 2009, 06:08 AM
Registered User
PeterO_UK's Avatar
Joined Aug 2006
1,462 Posts
Quote:
Originally Posted by sr71fan
I have no experience with the DC head, so you're on your own in that regard.
Gary
Errrrr Sure you do. Your model has DC head, just not a 2 axis DC head.

PeterO_UK
PeterO_UK is offline Find More Posts by PeterO_UK
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 26, 2009, 01:45 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
OOps!

Thanks Peter!

Gary
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 05, 2009, 10:34 PM
Registered User
Joined Jun 2003
676 Posts
Gary,

I really like your gyroplane!

Can you tell me a little about your 3 blade rotor? Are the blades reinforced? Are you using any type of hinging? How much negative incidence is in the blades?

What size are the blades chord and span?
grant31781 is offline Find More Posts by grant31781
Reply With Quote
Old Apr 06, 2009, 12:27 AM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
Grant,

Glad you like it. The blades are 2 inch by 12 inch (25 inch rotor) made from 3mm Depron, and have 2mm carbon rods (that's all I had) taped to the leading edge. The pitch (don't know how much) is the result of overlapping the leading and trailing edges of adjacent blades. The trailing edge is placed on top of the leading edge of the following blade. The blades are then sandwiched between two circular discs, and everything is held together with hot glue. Any "hinge" is coincidental with the flexing of the Depron discs. Oh, and I added a 1 inch square (should be round) of 1/64 ply above and below the hub to prevent the shaft bearing from pulling through the foam.

I hope this makes sense... I sorta copied Michael Connally's hubs from his giant Twirl modification which he derived somewhat from Al Foot's Twirl design (I think). I can't remember half of what I did; I usually take the simplest and quickest route (yes, you can call me lazy).

Hope this helps. Take a look at what I did at work today while I was waiting for some customers...

Gary

Autogyro Fun Indoors (1 min 38 sec)
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 06, 2009, 11:05 AM
Registered User
Joined Jun 2003
676 Posts
Cool video! How did you get the baldes set/ aligned at 120o apart?
grant31781 is offline Find More Posts by grant31781
Reply With Quote
Old Apr 06, 2009, 12:01 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
Grant,

I drew a circle on a piece of cardboard for use as a template. Guessed at the three points; then kept changing them until they were all the same distance apart. Assembled the rotor over the template.

Gary
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 07, 2009, 07:54 AM
If it flies, I crash it!
dlazarus6660's Avatar
USA, NH, Londonderry
Joined Nov 2006
926 Posts
Awsome!

Hey Gary,

Awsome video!

I'm still in awe over your Cessna 402!

Still fly it?

BTW, can you take some detailed pic's of the Cessna 402 so I can "borrow" your ideas to build one?

Keep up the good work!

Daniel
dlazarus6660 is offline Find More Posts by dlazarus6660
Reply With Quote
Old Apr 07, 2009, 12:46 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
Daniel,

Yes, I still fly the 402; it goes with me to every event. PM me your e-mail address, and I'll send pics.

Glad you like the video.

Gary
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 14, 2009, 01:45 AM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
Made a new ship yesterday, and test-flew it today. Basically the same as the second one, and used the 3-blade rotor from it. This one has a taller mast and more tilt back, to get it spinning up faster on takeoff. Here are some pictures I took while flying it:

Gary
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 14, 2009, 06:38 AM
Registered User
JochenK's Avatar
Joined Jan 2005
1,286 Posts
Grant,

well done. Congratulations.

Jochen
JochenK is offline Find More Posts by JochenK
Reply With Quote
Old Apr 15, 2009, 04:03 PM
Suspended Account
heli_ebook's Avatar
Joined Apr 2006
658 Posts
Could this be built with just foamboard, instead of 2-3 different materials? The blades being the most delicate I would think.
heli_ebook is offline Find More Posts by heli_ebook
Reply With Quote
Old Apr 20, 2009, 12:17 AM
Suspended Account
heli_ebook's Avatar
Joined Apr 2006
658 Posts
Great answer, keep up the good work!
heli_ebook is offline Find More Posts by heli_ebook
Reply With Quote
Old Apr 22, 2009, 02:44 AM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,559 Posts
I guess you could make it out of whatever you want. I used what I had on-hand.

More video...

Gary

Autogyro Fun Outdoors (2 min 1 sec)
sr71fan is offline Find More Posts by sr71fan
Reply With Quote
Old Apr 22, 2009, 03:47 AM
Suck it and see
Norfolk Flyer's Avatar
Cromer, North Norfolk Coast, UK
Joined Aug 2008
525 Posts
Nice one Gary,

For such a lightly loaded model, it (and you) handles the wind very well.

I calculate you have just 2 ounces per square foot. I'm working on a variation right now. Hope to have results soon.

John
Norfolk Flyer is offline Find More Posts by Norfolk Flyer
Reply With Quote
Old Apr 22, 2009, 07:28 AM
Suck it and see
Norfolk Flyer's Avatar
Cromer, North Norfolk Coast, UK
Joined Aug 2008
525 Posts
Gary,

When building this, I wanted a similar model to yours, but with folding blades, which probably meant a flex plate type head. I used polypropylene to make the plate, cut from a clear plastic stacking storage crate. (don't tell the wife).
The actual blades are made as your design, 3mm depron with a 2mm CF rod on the LE, which I fixed in place with clear packing tape.
I knew I could never keep the weight down to under 7 ounces, so I made 14 inch rotor blades to achieve the 2 ounces per sq. foot that you have. My model is 10 ounces AUW.
Tail wheel and "finlets" complete the build. Sorry but no colour yet!
see pics

Video soon, I hope.

John
Norfolk Flyer is offline Find More Posts by Norfolk Flyer
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Looking for TurboCAD 2D 6.5 Zoom The Builders Workshop 22 Dec 01, 2006 01:04 PM
Yippee! My wife got me a digital postal scale today. My moth is 6.5 oz w/ no battery! The Other Dave Parkflyers 1 Feb 08, 2002 11:37 PM
Aeronaut 6.5x4 or 6.5 prop for Zagi 450T ? freq Foamies (Kits) 3 Oct 25, 2001 07:36 PM
Will a 6.5-4 prop work with a direct drive Permax 480? Ryan Nau Power Systems 2 Apr 29, 2001 12:43 PM