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Dag Autogyro - 9/9/2012 9:30 PM   
wizzzyyy


 

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Joined: 9/9/2012
Last Login: 12/23/2012
From: Nr.KidderminsterWorcestershire, UNITED KINGDOM
Status: offline 		I have 50+ years experience in rc aircraft,but am new to the autogyro.
I have completed a DAG, and after a terminal test flight I need help. The question I need to ask first is about control orientation. Is rotor head tipped backwords towards the fin, the same as up-elevator on a conventional aircraft, and rotor head tipped forwards the same as down -elevator.  The reason i ask this basic question is ,that ,on hand launching the autogyro into wind(quite strong),it started to climb steeply,and even with full down applied(rotor head tipped forwards) it continued into a vertical climb,then started to loop and go inverted, and the rest is history.!!!! This has made me wonder if the controlls were the reverse of those on a conventional aircraft,although I cant see why they should be. If not, what happened???
The hang angle was 18 deg. forward tilt 10 deg.,rearward tilt 20 deg.,and side to side movement 15 deg...Sevos 12 kilo pull.
Can anyone help and advise please ??



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RE: Dag Autogyro - 9/10/2012 11:46 AM   
rcflyerfl



Posts: 820
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Last Login: 6/19/2013
From: Lakeland, FL, USA
Status: offline 		I think you should go to RC Groups/ Autogyros.. There you may find DAve the designer to explain your problem.
Jim

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RE: Dag Autogyro - 9/10/2012 2:07 PM   
XE521



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Last Login: 6/10/2013
From: Ottobrunn, nr. Munich, GERMANY
Status: offline 		Hi wwwiiizzzyyy,

I've never had a DAG, so I can't help you with the figures. But, I did have a similar result when I first started, thank goodness without the 'Exitus Effect'.
I think you have over powered the kite resulting in an accentuated climb, thus resulting in the loop. Back off somewhat on the power before launching, and this will result in a shallower climb. Once you have achived the hight you want, back off slowly untill you have level flight.

One other thought, do you have the correct down thrust on your motor?

Best of lck.

Karl.

_____________________________

Master of Kiwi Kites

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RE: Dag Autogyro - 9/10/2012 5:42 PM   
wizzzyyy


 

Posts: 3
Score: 100
Joined: 9/9/2012
Last Login: 12/23/2012
From: Nr.KidderminsterWorcestershire, UNITED KINGDOM
Status: offline 		Thanks for that Jim,I may well do so.


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RE: Dag Autogyro - 9/10/2012 6:06 PM   
wizzzyyy


 

Posts: 3
Score: 100
Joined: 9/9/2012
Last Login: 12/23/2012
From: Nr.KidderminsterWorcestershire, UNITED KINGDOM
Status: offline 		Hi Karl,
The down thrust is 6 deg,as per the plan. However,I think you have hit the nail on the head in respect of the power. From what you say about the method of flying the model,I believe I was using far to much power !!
I was using 125 watts/lb,as I usually do on my airobatic fixed wing models. From the way you describe the way to fly the model,itwould seem to be a much softer/less power affair. I fear I have made a novice mistake of thinking that an Autogyro needs all the power it can get in order for the blades to reach a flying speed. I see now that this is not the case.
Repairs (rebuild) are well under way, so I will have another attempt before too long.
Thank you for your advice,and if you have more I would be glad to hear it.

John


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