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February 23, 2018, 03:09:30 PM *
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Author Topic: Bar Fly Legal Eagle  (Read 3608 times)
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Skymon
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« Reply #25 on: January 23, 2018, 07:41:28 AM »

John
I read that these cabin type models fly right hand circles.
My other indoor stick stuff flies left, so I was expecting that to continue.
My feeling with this one was just let it go and what ever way it goes, adjust that circle...
I wonder if precession effect has any bearing on the turn direction.... with such big indoor props there has to be a resultant from that torque up front.

Many thanks for the kind comments, I'm relatively new to indoor, having returned to aeromodelling after a long lay off.

I'm really enjoying the whole precision of it all.

Best regards
Si
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piecost
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« Reply #26 on: January 23, 2018, 08:45:43 AM »

Thanks for the compliment John. The model should really fly well at that weight. My 3g models were so much better performing than my 3.4g example. A positive snowball effect I suppose.

With regard to circuit direction; we found that with LH circuits Legal Eagle models struggled to take off or even landed again with high turns and torque. Circling with torque tended to keep the model Earthbound. RH circuits gave more consistent, steeper initial climbs.

The circuit direction for stick models is critical in that the stick twisting causes wing warp to aid trim after launch.

With these full fuselage models this effect is not present. But the RoG introduces different limitations. Lots of torque is needed to take off (more than for a hand launch) but if you give too much the model may stall, torque roll and crash as its stability cannot overcome the destabilising effect of the propeller.
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Skymon
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« Reply #27 on: January 23, 2018, 09:47:11 AM »

Interesting info - I'll soak my stab off and add a bit of RH to start the turn.
Does stab tilt work as effectively on this type of model too?

What torque are you launching at?
I measure in g/cm, but I can easily convert Smiley

Looking at my calendar I think the 6th March will be my next session indoors.
I'm hoping to have a go with this model then.

Best regards
S

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piecost
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« Reply #28 on: January 23, 2018, 01:13:37 PM »

I employed 1/3rd partial motors under a 25' ceiling to simulate the over 50' height of the Brabazon hanger. Post 7 and 8 gives the motor and turns. I do not use a torque meter,  though it is a good idea. Scaling the torque from data obtained from testing gives me a launch torque of 11g.cm. This would put my model through the roof of a low ceiling site. Perhaps you could try motors ranging from 1.6g/m to 2.0g/m in loops from 22 to 24 inches.

I must try a full motor under the low ceiling
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Skymon
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« Reply #29 on: January 24, 2018, 06:24:13 AM »

Piecost
Was your 8" loop a 1/3rd motor??
SO a full one would be 24"?


Regards
S
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piecost
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« Reply #30 on: January 24, 2018, 06:32:48 AM »

Yes
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