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Building Tips and technical articles. => Building techniques => Topic started by: Phil Goldberg on March 10, 2017, 06:03:20 PM

Title: Weight Box at Wing Tip
Post by: Phil Goldberg on March 10, 2017, 06:03:20 PM
The model I working on has (open construction wing tips) meaning I can look straight through from the top.  The wing tips are quite thick and I am wondering if anyone has ideas for putting a weight box right into the wing tip.  I am thinking a tube (either aluminum or carbon fiber) with a cap or something of the sort.  Any ideas?   
Title: Re: Weight Box at Wing Tip
Post by: Leester on March 10, 2017, 06:32:36 PM
Carve your wing tips from blocks and put your tip box in the tip !!! This is a Brodak Profile ME-109 that I did .
Title: Re: Weight Box at Wing Tip
Post by: Russell Shaffer on March 10, 2017, 07:58:33 PM
I have seen tubes used for weight boxes and it works just fine.  Don't worry about keeping it light, though.  After all it is a weight box - brass, copper, whatever will work great.
Title: Re: Weight Box at Wing Tip
Post by: Tim Wescott on March 10, 2017, 11:13:42 PM
From this thread (http://stunthanger.com/smf/building-techniques/fancherized-twister-build/).

(http://stunthanger.com/smf/building-techniques/fancherized-twister-build/?action=dlattach;attach=111228;image)
(http://stunthanger.com/smf/building-techniques/fancherized-twister-build/?action=dlattach;attach=111230;image)
Title: Re: Weight Box at Wing Tip
Post by: john e. holliday on March 11, 2017, 11:16:53 AM
This must be a scratch build as most kits show how to do weight boxes.  If you do a search and spend some time reading you would find not only the two ideas mentioned but many others.   if I sound harsh it may be I'm still recovering from an all night drive,   But even in all my years of modelling I still do a search on here as well as reading each day and still learn something new even from the kids that post on here..   

So except my apologies. H^^
Title: Re: Weight Box at Wing Tip
Post by: Tim Wescott on March 11, 2017, 11:32:45 AM
Quote from: john e. holliday on March 11, 2017, 11:16:53 AM
If you do a search and spend some time reading you would find not only the two ideas mentioned but many others.

Which, BTW, means that there's a whole lot of right ways to do a weight box, and not very many wrong ones.  As long as it holds the weights in place and doesn't let them rattle, and as long as you're not having to custom-build weights for each of your planes, then you've achieved Weight Box Nirvana.
Title: Re: Weight Box at Wing Tip
Post by: Allan Perret on March 11, 2017, 12:51:17 PM
Tube type, for weights I cut various lengths of 5/16" steel rod, use a nylon set screw for cap.
Title: Re: Weight Box at Wing Tip
Post by: Tim Wescott on March 11, 2017, 12:53:11 PM
Quote from: Allan Perret on March 11, 2017, 12:51:17 PM
Tube type, for weights I cut various lengths of 5/16" steel rod, use a nylon set screw for cap.

How do you control the fore-aft CG when you change tip weight?
Title: Re: Weight Box at Wing Tip
Post by: Allan Perret on March 11, 2017, 01:01:16 PM
Finished install.  Control CG with light spacers to position weights fore / aft in tube.