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main spar scarf joint

Anything to do with gliders & gliding.
Robcrad
Posts: 52
Joined: 30 Sep 2020, 11:18
Location: Oxford

main spar scarf joint

Post by Robcrad »

Hi all
I have had to scarf joint the spars of a wing and have a quick question, What is the best position for the joint, nearer the tip or nearer the root of the wing? I was planning to put the joints nearer the tip as I was thinking less stress on them, but now I am not so sure, any ideas gratefully received.

Regards
Rob
IanT-White
Posts: 36
Joined: 31 Jan 2020, 16:17
Location: East Yorkshire

Re: main spar scarf joint

Post by IanT-White »

Rob , the stress on a spar is an exponential curve with the greatest stress at the root , by the time you get to quarter span ,the stress is about half the stress at the root .and tapering away towards the tip
To answer your question the splice will be better made near to the wing tip.
Regards Ian Turney-White
Robcrad
Posts: 52
Joined: 30 Sep 2020, 11:18
Location: Oxford

Re: main spar scarf joint

Post by Robcrad »

Thanks for the answer Ian, towards the tip it is.

Regards

Rob
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