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Avoncraft T53 Refub - Help wanted for C of G

pfcallaghan
Posts: 10
Joined: 27 Jul 2015, 08:39
Location: Cornwall

Avoncraft T53 Refub - Help wanted for C of G

Post by pfcallaghan »

Hello everyone
Im currently restoring a 70s vintage Avoncraft Slingsby T53 Phoenix 2 channel glider that has been languishing in the loft for nearly 20 years!
Anyway all progressing well but would anybody out there know/remember where the suggested C of G should be please?

I hopefully have attached a couple of stock pictures of the model to jog any memories into action.
Cheers
Paul Callaghan
Avoncraft T53.jpg
T53.jpg
john greenfield
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Joined: 18 Mar 2015, 07:52
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Re: Avoncraft T53 Refub - Help wanted for C of G

Post by john greenfield »

With its straight non tapered wing and generous tail area I would start with a CG of 28 to 30% of the wing chord back from the leading edge.

AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)
pfcallaghan
Posts: 10
Joined: 27 Jul 2015, 08:39
Location: Cornwall

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by pfcallaghan »

Thanks John
The pictures don't show it but there is a massive amount of forward sweep to the wings ( a bit like the original).
I will probably work slowly backwards from the leading edge if I cannot find any definitive information from previous owners.
thanks for the help though.
Paul.
Barry_Cole

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by Barry_Cole »

Try this:-

https://rcplanes.online/cg_calc.htm

Start with the static margin at 15% for safety

BC
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by chris williams »

I'd put my money at somewhere near the LE
pfcallaghan
Posts: 10
Joined: 27 Jul 2015, 08:39
Location: Cornwall

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by pfcallaghan »

Thanks everyone for you help.
Chris is the second person to say the 'leading edge' so I will start there and gradually work backwards.
I will put a picture up when I have finished it for interest sake, attached is a picture of the model once I had finally got the god awful solarfilm off the wings.
The canopy is in 'poor' shape, and I have made a new stab.
The fus has gone a lovely shade of 'old english white' but I am reluctant to repaint it - to be fair it does go with the vintage look :lol: but now the wings are covered in pristine white Oracover it does look somewhat odd!
Anyway to be truly scale it should all be light grey....
So again thanks for the help chaps and I will stick a couple of photos up when its done.
Many thanks
Paul
IMG-20200427-WA0003.jpeg
roo Hawkins
Posts: 557
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by roo Hawkins »

hi I built a 4.2 meter one and I balanced it on the l.e at the root at fuz end.
Attachments
f9 (1).jpg
t53.jpg
john greenfield
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Joined: 18 Mar 2015, 07:52
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Re: Avoncraft T53 Refub - Help wanted for C of G

Post by john greenfield »

john greenfield wrote: 30 Apr 2020, 08:45 With its straight non tapered wing and generous tail area I would start with a CG of 28 to 30% of the wing chord back from the leading edge.

AEB
Paul
You may have misunderstood my comment. The CG should always be referenced to the mean aerodynamic chord, not some arbitrary location at the wing root. With a straight non tapering wing the mean aerodynamic chord will be at the 1/2 span of the wing panel. Locate this point and go back 28 to 30%.

AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)
pfcallaghan
Posts: 10
Joined: 27 Jul 2015, 08:39
Location: Cornwall

Re: Avoncraft T53 Refub - Help wanted for C of G

Post by pfcallaghan »

Hey thanks for that John.
Hope all well with you.
Best
Paul
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