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Quickie Template Problem Print
Written by Dan Yager   
Thursday, 09 October 2008

I've been feverishly working on creating a set of full sized templates for the Single Seat Quickie for the past several weeks.  Over the last three years or so I've purchased several partial sets of PDF plans on eBay, and each of them contained a limited number of templates, and none of them overlapped so that I could verify scaling references.

However, one source from eBay was offering DXF drawings of the Canard, Wing, and Vertical Fin templates so that they could be CNC machined.  These DXF drawings are also available for download from the Q-list, so I don't feel particularly bad talking about them or refering to them here.

At any rate, my idea was to use these AutoCAD templates as a reference from which to confirm the other drawings I had.  But I ran into a slight snag that will require further input from people who know more about this than I do.  I think the LS1 template DXF drawings contain an error that could potentially lead a builder to sand away too much foam and therfore change the shape of the airfoil on the canard.

I want to bring this to the community's attention so that builders are at least aware of the potential problem before building from these templates.  Below is a "Canard Core and Spar Female Jigging Template" that I started to draw based on the DXF drawings on the Q-list.  This is the template from BL92 (Flipped upside down.)

As you can see below, I completed the circle for the canard Carbon Fiber Spar at this position, so that you could more clearly see the potential error: 

Quickie DXF Error

The plans ask that the builder sand off the tabs tangent to the spar, and then overlap the fiberglass layups onto the spar.  This would bind the outer skins to the spar and make them act as a single stronger unit.  However, if you look at the illustration below you can see that if you sand off the foam tangent to the spar you would remove too much foam and change the shape of the canard airfoil.  (The red area indicates foam to be removed.)
 

Quickie DXF Error

To me, this means that the DXF drawings are not accurate.  Either the Spar dimension needs to be larger, or the spar dimension is accurate at BL92, but the airfoil template itself is too large. 

Quickie DXF Error

The original intent of the plans is for the builder to only remove the tabs, not any additional foam on the airfoil.  (As shown below.) 

Quickie DXF Error

Hence, to make a long story short, I have decided to stop relying on these DXF drawings until I have some further input from the Quickie Builder Community.  I would like to make the templates available to everyone.  But most importantly, I want to ensure that they are accurate. 

I am trying to get my hands on an original set of drawings, and I think I have a pretty good lead on these.  However, I won't sell any templates from this site, unless I can do everything in my power to ensure that they are as close to the originals as possible.

The problem I see with the LS1 canard for the Quickie in general, is that it seems to be one of the very last things that Quickie Aircraft Corporation produced before going out of business.  This is attested to by the fact that they didn't make them available to everyone until the very last newsletter that they published.  I assume that several people have built a single seat Quickie with the LS1 canard, but I have no concept of how many were actually built, or how well developed the LS1 plans were for the Quickie.

If you'd like to fill in some of the gaps in my knowledge, would like to help me create a full set of accurate templates, or would like to tell me that I'm full of crap, I invite your comments below.  Undecided




Comments
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Jim Payne  - LS1 Q1 Wing Mod...   |2008-10-11 12:37:04
I hope you are able to get somewhere with this. I have been wanting to build an LS1 Q1 for
awhile. If you need any help, let me know!
Dan Yager  - I'll keep working on it. . .   |2008-10-11 15:28:01
I think there are a lot of people out there looking for this information, so I'll keep
working on it until I get it figured out! Thanks Jim.

-Dan
John Ambler  - GU - LS1 hybrid?   |2008-10-16 23:23:16
Slightly related. Lately I've been pondering the concept of a canard using the LS1 airfoil
shape with the GU construction methods. This would eliminate the complications of a Carbon
Fiber spar yet allow for the performance of the LS1. Integrity should be fine considering
the light wing loading of the single seat Quickie. Perhaps its a nutty idea, but I can't
get it out of my head. When GU and LS1 templates surface, this idea could be explored.
Sorry for the hijack.
Dan Yager  - Hybrid?   |2008-10-17 08:11:01
Hi John,
I think this has already been done on the Tri-Q-2's, but I think it was tried
mainly because the landing loads didn't need to be absorbed by canard on the tricycle
geared versions.

You can probably find more information by contacting people in the
quickiebuilders group. (They've been around for a long time.)
http://www.quickiebuilders.org

I think this idea was originally proposed by Quickie
Aircraft Corporation and you can read about it (and why the idea was abandoned) in Quickie
newsletter 19 page 2 (Under the heading "AVAILABILITY") on this site
here:

http://www.quickheads.com/QUICKIE-NEWSLET TER-19-page-2.html

I'm not trying to
squash your enthusiasm, I just want to ensure that you stay safe while pushing the design
envelope.

I would be more than happy to report your results, here on this site, if
you'd like to persue the idea. Please keep me posted.

I hope this finds you well.
Have fun but stay vigilant!

Good luck,
Dan Yager
www.quickheads.com
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