View Single Post
Old 05-22-2012, 06:18 AM   #1 (permalink)
EricW
Registered Users
 
Posts: 1,401
 
My HF Map location
Join Date: Mar 2007
Default Test Gryphon 700 blades

Test Gryphon 700 blades

Introduction:

Gryphon has been brought to my attention a while ago and I noticed they are producing very interesting products for RC heli pilots.
Next to blades, they offer smart and good looking electronics for Nitro and electric helicopters.
http://www.gryphon.co.kr/

RogiŽr, Gm of Rigidheli.com distributes Gryphon in the EU/Benelux, and he managed to get hold of a couple of prototype sets of the brand new 700 mm blades.
He also provided two sets of the already released 615 blades to be tested by a selection of Dutch 3D Pilots.
The 615 mm blades were tested by Anko Dragt (Hex50) en Niels Breet (Logo 600).
The 700 mm blades were tested by Eric Weijers en Frank Nijboer (Compass 7HV).

Often people suggest Carbon Fiber blades are produced in the same, or just in a couple of factories and the technical differences are very minor.
Same airfoil type, molds, with small modifications here and there.
And most of the flight characteristics are heavily tempered by the settings and operation of our flybarless controllers.
And to be honest, I shared that vision to a certain degree before I actually started testing different blades on the exact same setup.
Itís also a fact these blades are produced in Korea, and developed and tested under full supervision of Gryphon.

The 615 Blades are released and available.
But iíd like to mention that both Anko and Niels really do like the overall performance and feel of these blades.
They have a super agile and direct feel to them, and some extra Exponential was needed.
The blades are still used by both pilots, and they stick to them so I was told.
So that tells something about their personal conclusion.


Equipment and reference material:

During the tests I used a Compass Atom 7HV, identical lipo batteries and approximately the same flight time and maneuvers.
A mix of Funnels and transitions, controlled piroflips, pirofunnels, tictocs in all orientations, rolls and flips, fast/slow, etc.etc.
All logged with an Eagletree module, and I did my very best to create an objective opinion out of each flight, and concentrate on the differences.

I tested two sample sets of Gryphon 700 blades.
Both with an unique Weight (center of gravity) placement.
Iíll refer to them as Sample A&B.
Between flights I switched between Edge 693, Edge Se 693, Rail blades 696, Compass 700.
To remain objective and fresh.

Blade specifications:

Gryphon 700:
Bolt to blade tip: 700 mm Root thickness: 14 mm Weight: 200 gram

Quality, Packaging and Presentation

The blades look really nice, good quality.
High gloss finish and the same solid feel all around, no weak or soft spots hiding under the Carbon.
The bolt bushings are made from aluminum.
The tips have a more rounded shape than most other blades.
And the paint scheme is stylish and very practical.
The Gryphon brand is nicely printed in gold on each blade and a bright red stripe covers the leading edge of the mostly white colored blades.
I personally like white, makes them more visible, especially when you're flying low.

The packaging is one of the most creative Iíve seen so far.
Simple but also very cool.
The blades are separated by two small pre-formed blocks made out of a firm foam in a black cardboard box with Holographic silver lettering.
To top it off, there is a wiping cloth included to remove any airflow interfering buggy objects...




Testing:

On the first day the test team had a lot of fun, but also a lot of bad luck.
A set of Gryphons type B got lost along with a 7HV during a spectacular flight by Frank.
In a wide, tail first inverted looping the 7HV just touched the long grass and it got pulled in hard.
After my first flight with sample A, I got pretty excited, and persuaded Niels to try them on his 7HV.
After less than a minute one of his swash balls backed out and autorotating was not an option.
He also came in hard.
We had an early opportunity to Judge the way they crash, I wished we didn't though.
But they are save, a steel wire keeps them together and no parts or Carbon were coming our way.

Luckily we had a sample set A & B left, to continue the testing.
All following flights were logged in the eagle tree module, flights with the other blades as well.
I soon realised during examination of the Graphs, that I couldnít find any significant differences between them.
Itís simply not accurate enough.
The only way to do this appropriately, would be in a lab with a controlled testing rig and identical load/pitch patterns.
I donít have access to this kind of equipment, so i concentrated on what i could feel.
Below an Amp graph of both blade types for who is interested:

Eagletree:




Comparison:

To describe a certain feel is a bit complicated, and I never read a report of this kind before, so to make things a bit more clear I decided to put some flight characteristics in a Table and add my personal score to each characteristic.



Conclusion:

The scores seem to have worked, my end verdict pretty much resembles the table results.
They fly well, and the first flight I had with ďsample AĒ was an absolute ďWOWĒ moment.
I was not alone, all four of us shared the same feeling.
Frank, Anko, Niels and later Danny (friend who flies Railblades) confirmed the same.

Sample A reacts particularly well in cyclic transitions and executing / exiting the more demanding maneuvers.
They remain precise and without wobble in small corrections, even under heavy loading of the disc.
Stops and punchout are also crisp and direct, no wobble or unwanted side effects there.
This tells me they are very effective, also on varying and lower head speeds.
The cyclic speed is comparable with most 690 blades I flew.
Something which is lacking most of the time once you go bigger than 690.

Sample B also performed well.
But did not excel like Sample A.
They felt a lot like the Edge SE blades, a bit more static but a lot of velocity on the short run.
My friend Herbert tested them on high speed runs (200 + Km/h ).
But the samples both seem to be designed as 3D blades, too sensitive / unstable for speedflying.

What people prefer or like more, is, and always will remain a personal preference.
The properties, or feel of a rotor blade most likely belongs in that category.
But I know from my own experience, differences do exist...
My conclusion,
Gryphon did a great job so far, and managed to produce a very nice set of blades.
Hard to suggest any further improvements, these are definitely keepers.
Iím sure they will have plenty of satisfied customers after release.

Regards,
Eric
__________________
One day I got stung, and now I love rotor sounds...Team RIGIDHELI.COM
T-Rex 700N Pro, Compass 7HV ult., MSH PRTOS
EricW is offline        Reply With Quote