REFLECTOR: Plumbing the Spar

Tue Feb 4 15:01:10 CST 2014

Phil,

If you had a really rigid spar it would make the ride much less pleasant in any kind of turbulence. Just wait till you do the flutter tests and start jabbing the stick. You are going to see some serious flexing!

Richard 

Sent from my iPhone 5 Classic

> On Feb 4, 2014, at 3:29 PM, Phil Hooper <phil at hdmnet.com> wrote:
> 
> Thank you all for the thoughtful responses.  I also talked to Scott Baker who is always so knowledgeable who confirmed your sage advice, before I read your messages.  I had assumed the spar was pretty rigid.  WRONG.  I was pleasantly surprised last night to lift the back of the wing and watch the spar flex lots.  Whew!  I shall implement your wisdom.  Happy building.
> 
> 
>> On Mon, Feb 3, 2014 at 6:58 PM, James Traynor <jtetraynor at hotmail.com> wrote:
>> Hi Phil
>>  
>> I just did my lower co-pilot side strake and yes have every thing plum level and true. Use the incidence gauge and twist the wing with wedges  which will twist the  spar back into place and flox in the back lower strake when ready. I pushed up from the ground to lock in the lower strake and as I lifted the wing laid back a few degrees. NEXT time I will have boards holding (pushing) down from the ceiling in my shop. Yes if there is any twist it will come out if you wedge the wing back perfect and lock in the lower strake to the side of the fuselage. Also if the lower strake will not move after floxing  you will need to cut the lower skin down the center of the spar and wing in that 1/2" gap as in the manual. 
>> I found that once bonded to the fuselage there is no changing the incidence at this time unless major undo work is done.
>> I love working with this kind of construction if you make a mistake there is and easy undo, redo, rebuild and fix it trick.
>>  
>> Have fun and enjoy
>>  
>> James  
>>  
>> From: ljepstein at hotmail.com
>> Date: Mon, 3 Feb 2014 20:32:13 -0500
>> To: reflector at tvbf.org
>> Subject: Re: REFLECTOR: Plumbing the Spar
>> 
>> 
>> No-
>> 
>> The wings should be on, all plumb & level, incidence gauge on, while you fabricate/install the strakes. The strakes are what hold the spar/wing at the correct incidence.
>> 
>> Larry
>> 
>> 
>> On Feb 3, 2014, at 7:40 PM, Carl Hoffman <hoffman3 at rcn.com> wrote:
>> 
>> I don't believe your suppose to put the wings on until the strakes have completed.
>> 
>> Carl Hoffman
>> 
>> Sent from my iPad.
>> 
>> 
>> On Feb 3, 2014, at 5:23 PM, Phil Hooper <phil at hdmnet.com> wrote:
>> 
>> Slow building Hooper here.  When we installed the spar everything was level, on the money.  The vertical line on the spar bushings was also on the money.  The fire wall was and remains dead nuts perfect.  The wings have been on for three months and we're about to mount the lower strake on the pilot side.  I rechecked the levels, and all is exact.  Nothing has moved.  However, in placing a level against the spare (front, outboard), and plumbing a line down between the spar and the wing to the center or the earth, it appears that the outboard part of the spar is twisted a bit, not in plumb, rotating aft.  My bubble level error may be from unevenness in the spar surface.  I am also assuming that twist will  be induced by the weight of the wings.  
>> 
>> Any thoughts from fellow builders wiser than I. Thanks very much.
>> 
>> -- 
>> 
>> -- 
>> Phil Hooper
>> President
>> Harvest Development & Media Inc.
>> 19851 Yorba Linda Blvd., Suite 204
>> Yorba Linda, CA 92886
>> voice: 714.693.8745
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>> web: http://www.hdmnet.com/
>> email: phil at hdmnet.com
>> 
>> 
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> 
> 
> 
> -- 
> 
> -- 
> Phil Hooper
> President
> Harvest Development & Media Inc.
> 19851 Yorba Linda Blvd., Suite 204
> Yorba Linda, CA 92886
> voice: 714.693.8745
> fax: 714.777.0134
> web: http://www.hdmnet.com/
> email: phil at hdmnet.com
> 
> 
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
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