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Old Nov 17, 2011, 08:30 AM
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Trailer Down By The River
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I ordered a spare head so I had a clean template for a flexplate or flapping hinge. I use polycorbonate for it now.
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Old Nov 19, 2011, 06:27 PM
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QLD Australia
Joined Oct 2009
294 Posts
Finally some videos of my HK C30 gyro

See here;
http://www.rcgroups.com/forums/showt...3#post19919315

About a 5-10kt headwind[good 10kts+ up higher]

The low battery flight was because I had a brain fade and used a 2cell battery instead of a 3cell 850mAh nano techs.

I get about 5-6mins on the 3cell 850mah.

All flights are with the 5'' blade extensions on each blade.

It now weights apx 850g, ready to fly.[bit heavy but goes well--making longer and wider blades soon]

I find 1.5mm fibreglass makes a good durable flex plate for the head[fibreglass boat building and repair shops usually have bits spare.
Some people are using fibreglass ciruit board type things.
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Last edited by minirotor; Dec 24, 2011 at 06:58 PM.
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Old Dec 22, 2011, 11:56 AM
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Trailer Down By The River
Joined Sep 2004
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I finally saw you first vid,,,Nice work!!
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Old Jan 02, 2012, 06:34 AM
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QLD Australia
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Finially the new wider blades

Well as mentioned a long while back, I was making a new set of wider blades for my HobbyKing C30.

Well they are finially formed/balanced/covered and fitted.

Now just need some good weather[its wet summer here] and short grass field to do some test hops first, and then hopefully some circuits.

Actually the origional HobbyKing blades with my 5" extensions looked more realistic, but hopefully these blades will allow it to fly nice and slow in calm air.

The whole Gyro now weights 920g RTF.

Regards, M
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Old Jan 02, 2012, 09:41 AM
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Rome,Ciampino
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Quote:
Originally Posted by minirotor View Post
Well as mentioned a long while back, I was making a new set of wider blades for my HobbyKing C30.

Well they are finially formed/balanced/covered and fitted.

Now just need some good weather[its wet summer here] and short grass field to do some test hops first, and then hopefully some circuits.

Actually the origional HobbyKing blades with my 5" extensions looked more realistic, but hopefully these blades will allow it to fly nice and slow in calm air.

The whole Gyro now weights 920g RTF.

Regards, M
Had a bad experience with my homebuilt blades on my cierva.
They where long the same but wider.
When reaching high side of spin-up, they used to "flutter" and slow down very quickly...
So I returned to the original ones.
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Old Jan 02, 2012, 12:43 PM
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Trailer Down By The River
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Originally Posted by ask21! View Post
Had a bad experience with my homebuilt blades on my cierva.
They where long the same but wider.
When reaching high side of spin-up, they used to "flutter" and slow down very quickly...
So I returned to the original ones.
Are you using the stock flapper hinge that came with the rotor head? Could be it is just too flexable. I use clear polycarbonate and while still flexible it is abit stiffer than stock. May I ask did you put the mounting hole for the blades at the cord CG point on all 3 blades and some lead weight at the leading edge of each blade near the tip??
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Old Jan 02, 2012, 02:04 PM
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Rome,Ciampino
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Originally Posted by TURBOOMNI View Post
Are you using the stock flapper hinge that came with the rotor head? Could be it is just too flexable. I use clear polycarbonate and while still flexible it is abit stiffer than stock. May I ask did you put the mounting hole for the blades at the cord CG point on all 3 blades and some lead weight at the leading edge of each blade near the tip??
I'm usin hinge like yours.

About the hole location, I believe you are right. That was an old set of rotor blad, and I just mounted them and went out to fly.
I have to check the CG and Hole position. I'm 90% sure that's the problem

Thanks!
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Old Jan 04, 2012, 11:40 PM
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Trailer Down By The River
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Let us know if that was your problem,,,I would like to know as if it is or not we will gain a litltle more knowlege.
Thanks!!
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Old Jan 06, 2012, 10:05 AM
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Scotland
Joined Jan 2010
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At last had my second flight today I need to re balance the blades there was some vibration and move the CG forward a little but other than that it flew well
Joe

HK C30.wmv (1 min 51 sec)
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Old Jan 06, 2012, 12:57 PM
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Originally Posted by TURBOOMNI View Post
Let us know if that was your problem,,,I would like to know as if it is or not we will gain a litltle more knowlege.
Thanks!!
I add a little weight to the tip(the blade were made of the lightest balsa) and relocate the hole.

It seems to be ok now. No difference with the old blade
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Old Jan 06, 2012, 10:50 PM
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QLD Australia
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Jackadopolus--great takeoff and landing.
I've never been game to do a hand launch[I carn't get to the sticks quick enough]

ash21--good to see the blades are working now.

Interesting question about the c of g, lengthwise and crosswise, in relation to the bolt holes.

The origional HK blades that came with the C30 are apx balanced at 50% lengthwise.
And 40% crosswise from the leading adge[LE]
However the bolt holes are apx 30% from the leading eadge[this also happens to be the thickest section of the blades as well]
So they have the c of g apx 10% behind the bolt holes.

Does anybody know what are the figures apx for Aerobalsa blades?
or any comments about this matter?

Regards, M
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Last edited by minirotor; Jan 07, 2012 at 12:17 AM.
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Old Jan 06, 2012, 11:01 PM
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Trailer Down By The River
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Great flight Jackadopolus!! That was much better than the last video I saw of yours,,,well done! As far as making blades goes I have only made a total of 4 blades on my HK cierva.
One was damaged in a minor crash. I used the plans for the Spiro blades and either from the Spiro plans or that very good 2 part video on making autogyro blades was instructed to balance cordwise and then make the blade mounting hole on the that CG.The blades have worked perfectly though.
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Old Jan 07, 2012, 03:28 AM
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Scotland
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My local flying sites are waterlogged so hand launch is the only way to get a flight with the risk of tail strikes when you land
I hope to visit another site today weather permitting they have a tarmac runway
Re-balanced the rotor also had a bent motor shaft
Will post video of any flights
Joe (Jockadopolus)
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Old Jan 07, 2012, 04:55 AM
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QLD Australia
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Well, tried my new wider/longer blades on the HK C30 today.
Did a few hops.
The grass is really too long here at the moment to easily get a good easy run up.
It appears to fly really nice and slow[which is what I really was aiming for]

An interesting finding was that as the blades had a lot more lift than anything I've used previously, I had to move the C of G foreward quite a bit to get it to fly level without full foreward stick.

Hopefully a circuit and a video new week.

Regards, M
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Old Jan 08, 2012, 12:18 AM
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Elizabeth South Australia 5113
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If you were only using the stock blades on you previouse flights ,then you will find that they were only 4.7 mm thick ( to thin ) compared to the 6 mm ( I presume) ones you have made.
Chris.....
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