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Secondhand Flair Pup

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Mark a18/06/2017 09:37:26
321 forum posts
3 photos

Morning all

I picked up a secondhand Flair pup at Weston yesterday and have a question regarding the c of g. The model has an ASP 61 fs up front which maybe over kill for this model but it has good compression so it will be staying. I have read various c of g recommendations but I'm after a good starting point to balance the model.

Cheers

Mark.

Peter Miller18/06/2017 09:43:46
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11080 forum posts
1308 photos
10 articles

The way that I do biplanes is this.

Mark the 25% point on the top wing and the bottom wing. The CG should be in the middle between these two points.

Always worked for me.

Former Member18/06/2017 17:56:41
3577 forum posts

[This posting has been removed]

Mr.B.18/06/2017 18:01:36
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413 forum posts
26 photos

My one is 130mm back from the top wing LE as per the flair instructions.

**LINK**

Mark a18/06/2017 19:25:21
321 forum posts
3 photos

Thanks for the help guys. I'll balance it at 130mm and see how it fly's.

Mark.

onetenor18/06/2017 20:16:49
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1901 forum posts

The midway between the two 25% positions is fine but what about backstaggered wings.Does it still apply

i12fly18/06/2017 22:05:01
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632 forum posts
22 photos

Beware Mark! The instructions say use 130mm with a slightly nose down attitude.

In error I balanced mine at 130 with it level at flying attitude and it was tail heavy -a real handful!

I finished up adding several ounces more lead to get it correct (8oz in total with a 70FS too)

David Davis19/06/2017 04:44:42
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3751 forum posts
711 photos

I agree entirely with il2fly. I have had two of these and both were difficult to fly with the cg in the recommended position. I would recommend a cg of 110mm with the model level.

Bob Cotsford19/06/2017 09:11:31
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8571 forum posts
477 photos
Posted by Tom Sharp 2 on 18/06/2017 17:56:41:

Only works if the wings are staggered.

Can you explain why that should be please Tom? It sounds to be a workable option for anything without sweep.

pete taylor19/06/2017 09:47:10
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353 forum posts
164 photos
Posted by Tom Sharp 2 on 18/06/2017 17:56:41:

Only works if the wings are staggered.

It'll work the same, staggered or not Tom.

With 100mm stagger the mid-point will be 50mm behind the top mark. With 50mm stagger it'll be 25mm behind and at zero stagger the mid-point will also be zero.

The idea works for reverse stagger too.

Mark a19/06/2017 14:50:35
321 forum posts
3 photos
Posted by David Davis on 19/06/2017 04:44:42:

I agree entirely with il2fly. I have had two of these and both were difficult to fly with the cg in the recommended position. I would recommend a cg of 110mm with the model level.

Thanks Dave 110mm it is.

Cheers

Mark.

Former Member19/06/2017 16:46:10
3577 forum posts

[This posting has been removed]

Kevin Fairgrieve19/06/2017 19:17:33
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1668 forum posts
2979 photos

As per the plan on mine.

Kev

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