magni

[Brent Drake]

What band or kind of blades does a Magni have?
Thanks for replies!
Brent

[wannabee]

Magni makes their own. They will not sell them individually. (I've tried). It is pretty top secret stuff actually. Some say that the way they manufactuer their blades is the key to the secret of their amazing stability. It is true, they look like nothing else on the market.

[CypherNinja]

Originally Posted by wannabee

It is true, they look like nothing else on the market.

Now I'm interested.......

[MikeBoyette]

Originally Posted by wannabee

Magni makes their own. They will not sell them individually. (I've tried). It is pretty top secret stuff actually. Some say that the way they manufactuer their blades is the key to the secret of their amazing stability. It is true, they look like nothing else on the market.

I ain't gonna take the bait this time!!!!!!!!!

[wannabee]

Come on let's think of something to debate about....

[Sapientino]

Originally Posted by wannabee

Magni makes their own. They will not sell them individually. (I've tried). It is pretty top secret stuff actually. Some say that the way they manufactuer their blades is the key to the secret of their amazing stability. It is true, they look like nothing else on the market.

I'm from Italy and I've flown a lot magni's gyro now I've built my gyro with Dragonwings Blades that in my opinion are even better (even if magni is a great gyro, and his blades are very nice)

-mine Dragon wings has less vibration than magni (with proper undersling)
-Dragon wings weight 20 kg less but in flights they have the same attitude when you loose rpm (I mean that even if Magni's blades weights more seems to have not more inertia)
-DW seems to be much efficient
-only disadvantages of DW is that since they are alluminium polished you need to wax them to protect from oxidation

Anyway I had opportunity to see inside a magni blade (broken by a ground hit), and it has a spar of unidirctional fiber in epoxy, a lead weight in the front side of the blade (for all blade lenght), and a foam core with a skin of fiber.
The profile is a NACA 8H12 with 2,5° pitch angle and it's not twisted like Dw (this is in my opinion the biggest advantge of DW)
I would not change my Dw for magni's blades

[Aussie_Paul]

Originally Posted by Sapientino

-mine Dragon wings has less vibration than magni (with proper undersling)
-Dragon wings weight 20 kg less but in flights they have the same attitude when you loose rpm (I mean that even if Magni's blades weights more seems to have not more inertia)
-DW seems to be much efficient
-only disadvantages of DW is that since they are alluminium polished you need to wax them to protect from oxidation

I would not change my Dw for magni's blades

Sapientino, nice gyro you have.

Did you compare both Magni and DW on your own gyro?

Have you flown with Magni blades on your gyro?

Thank you.

Aussie Paul.

[Brent Drake]

I have a set of RAF on my Twinstar and thinking of getting a 2nd set of blades. Mine have about 300 hrs on them. They fly well. Looking for something a little more balanced.
Brent

[Sapientino]

Originally Posted by Aussie_Paul

Sapientino, nice gyro you have.

Did you compare both Magni and DW on your own gyro?

Have you flown with Magni blades on your gyro?

Thank you.

Aussie Paul.

Thanks for your compliments (in some old posts you can find more photos of my gyro)

No I didn't compare blades on my gyro (that's why I told that Dw "seems" to be more efficient even if it is pretty evident especially in take off).

Anyway also other people that owns magni when tested my gyro agreed with my considerations about Dw vs Magni blades



By the way did you stop with your Firebird project? since your web site has not more news since 2003

[Sapientino]

Originally Posted by Brent Drake

I have a set of RAF on my Twinstar and thinking of getting a 2nd set of blades. Mine have about 300 hrs on them. They fly well. Looking for something a little more balanced.
Brent

I would suggest Dragon wings but it is very important to use the undersling that Ernie suggest

[Brent Drake]

Thanks for your info. I've heard alot of good things about dragon wings. I think i'm going to get a set for my Bensen project.
Thanks
Brent

[Aussie_Paul]

Originally Posted by Sapientino

By the way did you stop with your Firebird project? since your web site has not more news since 2003

....I had some difficulties with the supplier of my composite components, and had to change the structure of the composite side of the business. I now have total control of the project and it happening quite quickly.

Our web site is about to be updated, now that I have something to show!!! I will be releasing details early in the New Year.

What is the empty weight of you gyro ans what diameter DWs are you using?

Aussie Paul.

[gyrogreg]

Originally Posted by wannabee

Magni makes their own. They will not sell them individually. (I've tried). It is pretty top secret stuff actually. Some say that the way they manufactuer their blades is the key to the secret of their amazing stability. It is true, they look like nothing else on the market.

Magni rotors incorporate some technologies that are not commonly seen or appreciated with some other rotors. But, there are really not many "secrets" in this. To see more about the Magni rotor "secrets", see the following article on our Magni USA website:
Why are Magni Rotors so Smooth
Vittorio says the factors noted in this article are correct. But, he tells me, with a smile, you still have not figured out one technical factor - that he isn't ready to disclose - so I guess that is a "secret"!

Wannabee said the rotors are a secret of the Magni Stability. That is partially true. But the big thing with the rotors are the techniques to make it smooth.

In comparing any rotor, you would definitely need to compare apples to apples. Single seat gyro rotors are shorter and are much easier to get smooth than a heavy 2-seat gyro rotor. Heavier gyros often use longer rotors, and I do believe the Magni rotors are among the smoothest achievable for 2-seaters. Read the article to find out how they do this.

---------------------------------------

I believe gyroplane rotors do play a significant part in gyro stability - especially dynamic stability. While static and dynamic stability are strongly factors of the airframe and HS aerodynamics (thrustlines, HS, drag lines, etc.) The rotor inertia can be an important factor in dynamic pitch stability.

For this reason, I believe that rotors may not be readily interchangeable on specific gyros. I believe one element of the Magni stability is that the inertia, or the response rate of the rotor, relative to the pitch inertia/response rate of the airframe. The response rate of the rotor is such that the airframe can react to a disturbance (G-load or airspeed) at a rate that provides a cyclic correction to the rotor BEFORE the rotor can do anything bad - like slow down under reduced g loads - before something bad happens.

I believe that, due to the harmony of this feedback between the rotor and airframe, and vice-versa, the inertia of the rotor is a significant element of the Magni dynamic stability. I beleive that, when done right, these relative inertia rates can be "tuned" so that the gyro is very much immune from both buntovers and precession stalls.

For this reason, I would excercise caution in exchanging rotor blades just on similarity of size, chord, etc. I believe that the stability, or instability of some gyros may be related to a poor mis-match of rotor inertia/response to airframe inertia/response. Vittorio refers to this as a "harmony" of many factors in the gyro configuration.

I do believe that the Magni rotor inertia is comparable to that of the Dragon Wing inertia - so there may not be major differences between the two rotors on the same gyro. I beleive the Dragon Wing rotors achieve this inertia with tip weights, even though they weigh differently.

If you are interested, you can read more about how Magni achieves it's stability at:
Why are Magni Gyros so Stable?

[C. Beaty]

Originally Posted by Sapientino

Anyway I had opportunity to see inside a magni blade (broken by a ground hit), and it has a spar of unidirctional fiber in epoxy, a lead weight in the front side of the blade (for all blade lenght), and a foam core with a skin of fiber.

Years ago, Sapientino, Jukka Tervamaki sent me a sample section of one of his rotor blades.

It was exactly as you describe, linear fiberglass spar with a lead rod near the leadning edge for chordwise balance. The polyurethane foam core was quite rigid, unlike some of the meringue “cores” others use.

[Aussie_Paul]

Greg, when I started testing stability a few years ago I soon found that rotors ain't rotors!!!

Change rotors, and some times have to change torque tube offsets etc.

I am at the point with Firebird that I will have to fine tune the torque tube offset and trim spring stretch rate, and control ratiois to achieve the complete package.

I will also have to conduct this with both composite and extruded alloy blades as customers want a choice.

Aussie Paul.