Single blade gyro

skypirate1982

Newbie
Joined
Feb 5, 2015
Messages
7
Location
Independence, MO
I have been looking but haven't found anything on single blade rotors. Has anyone built a single blade rotor autogyro?

My aerodynamic knowledge is very beginner but I am curious. So here are my questions.

Would the single blade eliminate the 2/rev vibe?

Does the lesser interference drag of the single blade really make any difference?
 

WaspAir

Supreme Allied Gyro CFI
Joined
Oct 21, 2006
Messages
4,755
Location
Colorado front range
Aircraft
Bell 47G-3B-1 / A&S 18A / Phoebus C, etc.
Total Flight Time
stopped caring at 1000
Here's a snip from an old thread (Feb 2006) from a C. Beaty post:
It’s a long story, Mike, but I’ll try to repeat it as succinctly as I can.

I traded some stuff for a set of run out Hughes-269 rotorblades.

I made up a hub that incorporated a door hinge style joint at its center and used outboard drag hinges because the previous owner had tapered the root ends of two of the Hughes blades to make them resemble Bensen blades.

They flew beautifully after the usual amount of tinkering but I had the misfortune to be flying over the Gulf of Mexico about 100 yards offshore at Birdy’s altitude when a wire running my electric fuel pump came loose. Mustering dolphins, of course.

Needless to say, I did a water landing in about 12’ of water.

Someone was kind enough to give me a ride back to the airport where we picked up my trailer and a pair of ski ropes. Since I was already cold and wet, -it was around Christmas-, I swam out to the spot, dove down and tied a rope to the gyro.

Got the thing home, pulled the spark plugs on the engine, hosed everything down with fresh water and after a couple of days of drying, the trusty Mac lit right up.

I still had the urge to fly but had only one good rotorblade left. The obvious solution seemed to be a one-blade rotor.

I had seen pictures of the one-blade helicopter by one of the predecessor companies of MBB, so thought, with insufficient thought, why not?

My first attempt wouldn’t autorotate; I had been in too much of a hurry so had used a length of 1½” steel rod for a counterweight but it was too draggy.

Dragged everything back to the shop and made up a proper counterweight; a teardrop shape welded up from 1/8” steel sheet with enough lead poured in for balance.

The rotor autorotated just fine and was glass smooth as long as the stick wasn’t moved. Rapid stick movement caused a violent vertical hopping about like a dirt-tamping machine.

I think I might have gotten daylight under the wheels but decided then and there one-blade rotors weren’t my piece of cake.

My friend Gary, younger and far braver than I, wanted to have a go at it. Gary was just then growing new skin after a bout with an overhead stick.

I said; “Gary, be careful, move the stick very slowly or it will start hopping pretty violently.”

Well, Gary wasn’t careful; the machine started hopping and he stirred it around rapidly trying relocate the sweet spot and it hopped over with the rotor at full speed.

Gary lost more skin and it was back to the drawing board for me.

I suppose the MBB helicopter worked because of the use of a Hiller style servo rotor which can be adjusted for very slow rotor following. I have no idea how they compensated for the unbalanced torque.
 

Wiplash

Todd Noble
Joined
May 7, 2009
Messages
366
Location
Hudson, IN
Aircraft
Air Command 582 LowRider w/stab
Total Flight Time
Gyro - 101 as of 7-10-16
Here's a snip from an old thread (Feb 2006) from a C. Beaty post:
As I was reading the OP, I thought to myself "if someone has tried it, that someone would be Chuck"


:hippie:
 

C. Beaty

Gold Supporter
Joined
Apr 16, 2004
Messages
9,879
Location
Florida
Chuck, good to know you smart people do dumb things too.

Aussie Paul. :)
Thanks, Paul, but if I had in fact been smart, I’d have made up a scale model and run it in front of a fan.

Might have saved a bit of skin and 25 lbs. of aluminum.
 

XXavier

Member
Joined
Nov 13, 2006
Messages
1,206
Location
Madrid, Spain
Aircraft
ELA R-100 and Magni M24 autogyros
Total Flight Time
628 gyro (Sept. 2020)
Thanks a lot!!! The AIAA paper is very interesting...
 

C. Beaty

Gold Supporter
Joined
Apr 16, 2004
Messages
9,879
Location
Florida
Craig Wall showed up at Bensen Days many years ago with a Gluhareff valveless pulse jet engine mounted on a stand attached ot the bed of his Toyota pick up.

Quite an earsplitting racket when fired up.
 

johnrk

Member
Joined
Jun 7, 2015
Messages
178
Location
Wentzville
Aircraft
FW guy trying like ? to get into rotorcraft!
Total Flight Time
300+ (ASEL)
Years ago I bought a full size set of the GH-20 plans. The thrust was based largely on the fuel pressure and there were several tips for how to increase the pressure of the propane tank. Even with a large tank the run times were very short - it was wacky and I was very young. The thing was very dangerous!

All the rage nowadays are the valve pulse jets shown in the video below - also propane fueled. If you don't know Colin Furze then you are missing out - he is fun and talented - I recommend his channel:

https://youtu.be/muoAvTwkcQg

Here is his hover bike - lol, I guess I should mention that he is crazy!
https://youtu.be/soxxPyaAT1k
 
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All_In

Gold Supporter
Joined
Apr 21, 2008
Messages
14,999
Location
San Diego, CA. USA
Aircraft
Piper Archer, Aviomania G1sb
Total Flight Time
Not sure over 10,000+ logged FW, 260+ ultralights, sailplane, hang-gliders
Chuck is so amazing creates and test every idea he has and usually they work saving a bit of skin and 25 lbs. of aluminum.

And he cracks me up!!!
 
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