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Old Jun 20, 2016, 03:22 AM
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durafly autogyro g2 balance point

Can anyone tell me where the center of gravity is supposed to be. I have searched the internet and can,t find anything. I bought mine second hand and do not have the instructions/manual. Also does anyone know where to download a manual.
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Last edited by pauljdickinson; Jun 20, 2016 at 04:17 AM. Reason: forgot to ask for further info
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Old Jun 20, 2016, 04:58 PM
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Paul

Mine is balanced half way between the front of the wooden mast and the hatch opening and flies smoothly and very well. You can go back to just in front of the mast but it becomes more lively at that.

Graham
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Old Jun 20, 2016, 05:02 PM
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Sorry Paul--forgot to mention .....

Mine needed about 15 grams of stick on lead in the cowl cheeks alongside the motor to achieve that cg.

Graham
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Old Jun 20, 2016, 09:04 PM
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With a 3s 1300 mAh pack mine has its CG almost directly under the center of the head. Seems pretty far aft, but it flies well and has around 150 flights so far. It does have a tendency to pitch up power off or with a gusty tailwind. Power-on, it's dandy.
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Old Jun 21, 2016, 02:09 PM
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autogyro g2 C ofG

mine seems to balance under the rotor head. I assume you lads are testing for balance with the craft inverted. So with 2 replies the balance point seems to be halfway between the mast and the battery hatch and underneath the rotor head. If you lads have a manual what does it say in there. Mine when i bought it had a 3s 1000mah in addition to the 3s 1300mah and it balanced approx 10mm behind the front of the mast. The 3s 1000mah was to power led lights on the mast and motor bay (for orientation )
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Old Jun 21, 2016, 04:58 PM
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Hi Paul

Manual showed C of G just in front of the motor mast balanced inverted .

Mine also had the tendency to pitch up under power which is why I moved it a few mil forward . This has now cured this and it climbs gently under power whish is in line with the rest of my fleet of 13 gyros.

Graham
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Old Jun 22, 2016, 12:32 PM
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Thanks for your replies. I can't understand how you have got the balance point so far forward. With the recommended battery a 3s 1300mah mine balances pretty much under the rotor head which is probably 20 + mm behind your c of g. Have you put a load of ballast up front to achieve your balance point????? and what would happen if i try to fly mine with such a rearward c of g WOW you are the gyro man 13 gyros you should buy one more as 13 is unlucky.
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Old Jun 22, 2016, 04:59 PM
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Paul see post 3

With your current C of G it is likely the auto g will be difficult to fly straight and level and just climb steeply with any power on which will also cause problems in turns. A rearward CG is bad news on a gyro and usually results in only one flight !!

Graham
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Old Jun 23, 2016, 04:35 AM
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Thanks for your reply Graham. I will balance mine forward like yours. Why do durafly make these gyros so out of balance off the shelf they are supposed to be PNP . You would expect to plug in your receiver and battery and the model to balance to within a few mm of the c of g.
I will have a go at flying mine and post how i faired!!!!!!!!!

Paul
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Old Jun 23, 2016, 07:53 AM
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Hi i've just balanced my gyro to the front of the mast it has taken a load of weight probably 3 or 4 oz. But i just had a thought why it's taken so much weight. i have AJ blades fitted which i guess are a lot heavier than the stock foam/depron blades. I guess that the heavier blades pulling down on the rotor point which is rearwards of the balance point. Is now making the craft tail heavy . I forgot to mention it also has the cast/cnc aluminium rotorhead fitted wich is probably heavier than the plastic original .The only thing is now the model is a lot heavier and will need more power=less flight time. Your thoughts would be appreciated.

Paul
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Old Jun 23, 2016, 06:33 PM
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Not to confuse the issue, but when I changed over to the MIA delta plate, the first flight was a wild scramble to keep it out of the dirt...the trim had gone from neutral to strongly pitch down without any change in the CG. It finally came through to me that the blades were set so their pitch angle was a few degrees lower than it had been with the original head. I managed to correct this with shims of the proper thickness...problem solved without changing weight distribution at all.
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Old Jun 24, 2016, 11:22 AM
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Mine has a fiberglass ( i think) delta plate fitted and the neg pitch is built into the blades. The best thing i can do is try and get it off the ground and see what happens ???? . unless you know differently !!!

Paul
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Old Jun 24, 2016, 03:15 PM
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Paul

Mine also flies with a 0.8mm epoxy/glassfibre plate and from memory trim was just about the same as with the original head .

Try it and see - short hops first and don't forget to make sure the rotors are fully up to speed before lift off or it will pitch violently to the left.

Remember, use a little aileron to bank into a turn and then use rudder to maintain the turn using opposite aileron to control the bank and exit.

Good luck

Graham
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Old Jun 25, 2016, 11:47 AM
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Thanks Graham
Its a bit too windy today but i will try tomorrow if the wind drops.

Paul
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Old Jun 28, 2016, 03:03 PM
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Manual Mistake Surely ?

Just started to build mine and noticed that the build manual recommends a cg point that is 22 cm forward of the mast centre...
what, I say what ?

Something lost in translation there, surely ?
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