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Chipmunk C of G

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REVIEW: Seagull DHC-1 Chipmunk

REVIEW: Seagull DHC-1 Chipmunk

Andy Gower finds much to admire in Seagull’s 80” ARTF Chippy

Chris Bott - Moderator20/01/2019 17:24:52
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I have this to maiden soon.

img_20190120_122727.jpg

It's a Seagull 80" jobbie.

Now, I don't wholly trust manufacturers recommended C/Gs so I thought I'd canvass opinion here.

What other Chipmunks do you fly? And where is the C/G in percentage terms, at the root?

So that we all measure the same, please exclude any wing fairing but obviously do include the flaps.

Seagull's setting comes out at 33% which with the slight sweep forward (or less taper of the LE than the TE), means it might be a little aft?

bert baker20/01/2019 17:36:54
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On my Blackhorse 45cc Chippy, the cord is 420 mm and the Manual says 125mm back from leading edge,

It flys well at that setup,

It is 85” span

bert baker20/01/2019 17:42:51
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So I think that is about 30%,

Get the flaps mixed in with elevator trim,

Makes Chippys happier and easier to handle at full flap usage

Chris Bott - Moderator20/01/2019 17:44:23
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Thanks Bert. This is 80" and the recommended position is 130mm and the cord 380. So that bears out my suspicion already.

bert baker20/01/2019 17:57:11
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The book says it can upto 135 from leading edge at root where the two half’s join

Robert Parker20/01/2019 18:46:28
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Hi Chris,

I have a Galaxy Models Chippy at 72" span

Chord : 350mm

CoG: 105mm - 118mm

Regards

Robert

Chris Bott - Moderator20/01/2019 19:53:02
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Thanks Robert.
Low pass Pete10/03/2019 05:55:01
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I have flown my Seagull 80in Chippy with C of G at 130mm as per build instructions and she seems to fly well with it at this. Mine has an OS 120 upfront and with flaps fully deployed there is very little trim change.

Cheers

Peter

Cuban810/03/2019 10:00:32
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This works well, I've used on my Sig Zlin 526 which had a plan CG that looked odd (it was). **LINK**

Martin Harris10/03/2019 15:33:58
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My Airsail Chipmunk (apparently very close to scale as it was originally designed as an international level competition scale model) is shown at around 4.5" on a 13" root chord. The designer (Brian Borland) has stated that this C of G is conservative and can be moved backwards to suit the pilot.

I'm not sure where my C of G is now but I certainly set it to the plan position when I built it 17 years ago and it's always been a very well mannered model.  If it's any guide, spins are predictable but scale like without aileron input, the rate increasing after a couple of turns with the nose dropping. Recovery is less scale - almost instantaneous by simply centralising the controls.

Edited By Martin Harris on 10/03/2019 15:41:27

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