Re: GU canard for sale?

Frankenbird Vern

Geek alert!  Not a plug intended, but today I received the June 2021 issue of Kitplanes and on page 32 is an interesting composites testing article that has pertinent info for our projects on foam types and reveals test results. The data at this point in development is realistic in stating the vast numbers of combinations of fabric and resins + methodology still forces even large corporations to test, including lightening strike, birdstrike, and load margins. Of the foams tested Figure 2 on page 36 indicates that Rohacell performed best. As Charlie has noted, the failures to be concerned with are failure in shear of lighter density foams prior to failure of laminates applied (in the test case, carbon fiber). The author did state as far as fabric types pre-pregs tested the highest, but again, strict controls and tooling beyond a typical home shop environment are required to build honeycomb/pre-preg airworthy structures. The tests are intended for a new design aircraft...using I presume wet layup vacuum, perhaps infusion. Tests concluded Hexel 282/284 plain weave carbon fiber proved to be superior to spread tow and just below pre preg. More info on resin type and method of wetting the layup should be in future issues

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------ Original message------
From: One Sky Dog via
Date: Tue, Apr 27, 2021 11:09 AM
Subject:Re: [Q-List] GU canard for sale?

The best protection from lightning strikes is to avoid thunderstorms. But if you must fly near them here are the latest mitigation schemes. 

That thin layer of glass will not insulate the carbon. I have never worried about the carbon bits and spar caps in my Dragonfly. I fly in less than perfect weather but when lightning storms are forecast I would rather be on the ground.

One Sky Dog

On Tuesday, April 27, 2021, 3:34 AM, Richard Thomson <richard@...> wrote:


    The modern carbon airliners use glass pads as insulators for lightning strike, so as the carbon spar is wrapped in glass, it should be insulated from lightning stike I would have thought.

    Just my 2 new pence worth, (which is also a good coin for tap testing). 


    Rich T.

On 27/04/2021 01:40, Jay Scheevel wrote:

Any Q is faster if it is lighter and more power is added. Those factors are probably more important than the airfoil.  


VG’s on the GU solve the rain/contamination problem, but are a pain when trying to keep the canard clean.


LS-1’s break too, but just outboard of the fuselage instead of farther out on the wing.


There are several GU’s flying with O-200’s on them, so I suspect the QAC change from GU to LS1 was driven more by contamination problems than by strength issues (despite what was said in the QAC newsletters).


I am not sure that the speed of GU vs LS1 has ever been fully resolved, but there are a lot of fast GU Q’s that have been built with a variety of engines (Corbin’s is a very fast Q200 and has a GU canard. Paul Spackman’s Q2 with the GU and Jabiru engine is/was also very fast). More LS1’s have been built because of supply, so the sample size is larger and probably more is known about them because of that.


……The GU will not explode if hit by lightning, since no carbon fiber.







From: <> On Behalf Of Mike Dwyer
Sent: Monday, April 26, 2021 6:26 PM
Subject: Re: [Q-List] GU canard for sale?


In my opinion... 1) the GU spar ends 4 feet from the wing tip.  Lots of them break there on a hard landing.  2) It wasn't designed to carry an 0-200A (but I don't know what your running for an engine). 3) if you never fly in the rain your ok.  And I challenge that the GU is faster?  The fastest Q out there is Sam and he's an LS1.

Mike Dwyer

Q-200 N3QP


Q200 Website:



On Mon, Apr 26, 2021 at 7:57 PM ryan goodman via <> wrote:

John, PM me. I'm on the q Facebook group too if that's easier.


Mike, it's faster, and my LS one is already a little damaged. Plus I'm doing some fairly major changes and replacing my firewall already so seems a good time. Faster is legit the only reason for me wanting the swap. But I'm open to hearing reasons not to change back and to keep the LS.




On Mon, Apr 26, 2021 at 5:26 PM, John Lewis

<john@...> wrote:

Yup.  Located 40 minutes from Salt Lake City on I84.


John Lewis




On Mon, Apr 26, 2021, 5:09 PM Mike Steinsland <MIKESKUSTOMS@...> wrote:

Hey Ryan

I'm curious why you would switch that back.

Everything I read indicates the LS is some better characteristics



On Mon., Apr. 26, 2021, 6:00 p.m. ryan goodman via, <> wrote:

Anyone or there have a decent GU canard sitting around for a Q2? Tossing around the idea of swapping my LS1 back to that. Not fully decided as of yet but if there's one laying around for the right price that would save me making a new one it might twist my arm. 

       Thanks, Ryan

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