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Spar Strap

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jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Sat Dec 19, 2020 4:00 am Post subject: Spar Strap

I have come to the point where everything on the plane is finished and working. Everything? Not quite. Through procrastination, lack of understanding and the hassle involved in getting two wings lined up vertically I have put off making the spar strap until this is really the only thing keeping me from flying.Now it's winter and even more inconvenient since I have to do it outside.

Obviously if it is flight safety related its a no-brainer that I have to do it now or wait for better weather. But I am just wondering: is this really an A-item (failure leading to loss of A/C and crew) or a nice to have I can do later? With all the lift and pip pins in there it seems the wings are pretty secure. If this strap is what is separating you from disaster you probably have a different problem altogether.

Any thoughts?

_________________
Jeroen

http://www.europaowners.org/main.php?g2_itemId=44165

graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Sat Dec 19, 2020 4:11 am Post subject: Re: Spar Strap

my take is that it is part of a basket of measures taken due to an unexplained accident i  cardiff about 12 years ago. Europas had been flying without issue for probably 12 years before. it helps prevents twisting of spars under high stress.

_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

flydgw(at)gmail.com
Guest

Posted: Sat Dec 19, 2020 4:46 am Post subject: Spar Strap

The spar strap was introduced as part of the weight upgrade modification from 1300 Lbs. to 1370 Lbs. (and not a result of any accidents).

It was introduced to prevent the rear spar bending away at maximum loading.

Dave Watts



On Sat, 19 Dec 2020 at 12:05, jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)>

 

 I have come to the point where everything on the plane is finished and working. Everything? Not quite. Through procrastination, lack of understanding and the hassle involved in getting two wings lined up vertically I have put off making the spar strap until this is really the only thing keeping me from flying.Now it's winter and even more inconvenient since I have to do it outside.

 Obviously if it is flight safety related its a no-brainer that I have to do it now or wait for better weather. But I am just wondering: is this really an A-item (failure leading to loss of A/C and crew) or a nice to have I can do later? With all the lift and pip pins in there it seems the wings are pretty secure. If this strap is what is separating you from disaster you probably have a different problem altogether.

 Any thoughts?

 

 --------

 Jeroen

 

 http://www.europaowners.org/main.php?g2_itemId=44165

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=499731#499731

 

 

 

 

 

 

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jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Sat Dec 19, 2020 5:25 am Post subject: Re: Spar Strap

So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around.

_________________
Jeroen

http://www.europaowners.org/main.php?g2_itemId=44165

flydgw(at)gmail.com
Guest

Posted: Sat Dec 19, 2020 6:27 am Post subject: Spar Strap

Jeroen,

At 1300 Lbs. before the weight upgrade we were restricted to 150 knots max speed.

Dave Watts



On Sat, 19 Dec 2020 at 13:28, jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)>

 

 So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around.

 

 --------

 Jeroen

 

 http://www.europaowners.org/main.php?g2_itemId=44165

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=499734#499734

 

 

 

 

 

 

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 eferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

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DuaneFamly(at)aol.com
Guest

Posted: Sat Dec 19, 2020 7:23 am Post subject: Spar Strap

For me, anything that was a safety upgrade, I did. 

I found doing the spar strap very straight forward. I did notice that I had quite a bit of mold release that had to be judiciously removed from the top, bottom, and forward surfaces of the port spar. Then a good attention to detail on scuffing only those surfaces. After I was sure this was done, I verified the position of the strap, wrapped the corresponding area of the starboard spar with clear wrap, joined the two wings, and did the fiberglass wrap portion. I then wrapped clear wrap around both spars to insure a snug fit.

Have never had an issue with it since. 



Mike Duane

N377EA Europa conventional gear

Chandler, Arizona, USA



Sent from my iPhone



 	  Quote: 	
		   On Dec 19, 2020, at 6:26 AM, jglazener <j.glazener14(at)gmail.com> wrote:

 

 ï»¿

 

 So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around.

 

 --------

 Jeroen

 

 http://www.europaowners.org/main.php?g2_itemId=44165

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=499734#499734

budyerly@msn.com

Joined: 05 Oct 2019
Posts: 288
Location: Florida USA

Posted: Sat Dec 19, 2020 8:04 am Post subject: Re: Spar Strap

Just my two cents.

The spar strap prevents the spars from doing two things.

Bending back and impacting the aileron cross connect, twisting or separating.



As many have found on the original Classic, the spar cups took abuse.  Some of that due to poor security of the starboard tip by the 3/8 inch pin.  Some from the twisting of the spars under load, and some due to poor technique on installation and rigging.



With the GW increase testing, enlarging the pin to allow a pip pin to securely hold the spars firmly from creeping aft was a very thoughtful idea.  The spar strap really keeps the spars from bending which they do under load.  Remember, the XS short wing spar has no bid around it for a shear web, so the roves are good in vertical bending but not so great in twisting or bowing.  



So belts and suspenders.  Either enlarge the thickness of the spars with shear webbing as in the glider wing, or retain them seems to be the dilemma.  They chose simple, a spar strap.



I would always install a spar strap.  It aids rigging if built right with some clearance, reduces pressure on the spar cup during rigging, assists in keeping the spars safely put under high G pullouts.  



Take the time and do it right.  If you don't do it in construction, it may never get done.  In testing, if a situation requires a quick pull out, the added spar strap fixation may become a factor.  I try never to cut corners.  Anything worth doing is worth doing right.



Technique:

Support the wings and spars so the spars are exactly vertical, each wing is at the same incidence and the spar pins rotate easily.  This is important to ensure the strap is going to be properly aligned and not just slightly askew.  NEVER clamp the spars together to get alignment.



Wrap the starboard spar with blue painters tape then the release tape to give you a few thousands more room for rigging and more importantly derigging during construction.



Make the upper curved inlet  as shown but do the same on the lower on the starboard side of the cup layup to ease rigging.  I make my spar strap "ramp" about 1/4 inch larger than depicted as well as the strap to allow nice clean trimming.

Make your glass wrap as shown in the manual.

Wrap peel ply around your glass to prevent sagging and use some release tape to hold the peel ply from sagging if necessary.



In cold climates:

Try to find a shop that may let you do the work in the warm, but if that is impossible:

Make a box over the spars out of styrofoam and use an incandescent light to keep it warm to cure.



Once cured, if heat treat is necessary pull apart the wings and heat treat slowly in the garage.



The spar strap when done properly is an excellent aid in rigging as well.  As the starboard spar is inserted, it is aligned with the strap and will slide along the port spar and assist in self alignment.  The spars stay properly vertical, assisting the wing tip assistant.  If the builder also installs a rigging aid for the spar to slide on and assist in alignment,(keeping the spar from sliding aft) and building a small ramp on the spar root to assist lifting the spar as it hits the cup and thereby aligning the pins to very near their required elevation, even the most clumsy of assistants even without a saw horse or trestle under the wing will be amazed how easy the rig is.



Best Regards,

Have a great holiday..  Bud Yerly

Duncan McFadyean

Joined: 18 Jan 2011
Posts: 220

Posted: Sat Dec 19, 2020 9:44 am Post subject: Spar Strap

150Knts is a benefit when it comes to the annual (LAA) Permit Vne dive test!   



    	  Quote: 	
		      On 19 December 2020 at 14:26 David Watts <flydgw(at)gmail.com> wrote:     

     

         Jeroen,    

         

    

         At 1300 Lbs. before the weight upgrade we were restricted to 150 knots max speed.    

         

    

         Dave Watts    

         

                  On Sat, 19 Dec 2020 at 13:28, jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:        

      

       	  Quote: 	
		         --> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)>        

        

 So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around.        

        

 --------        

 Jeroen        

        

 http://www.europaowners.org/main.php?g2_itemId=44165        

        

        

        

        

 Read this topic online here:        

        

 http://forums.matronics.com/viewtopic.php?p=499734#499734        

        

        

        

        

        

        

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ward.t(at)xtra.co.nz
Guest

Posted: Sat Dec 19, 2020 1:10 pm Post subject: Spar Strap

If you trailer your aircraft then a modification will have to be done to the trailer wing spar holders to get the spar with the cap through. You will have to top hinge that spar holder. Two cents worth.



Sent from my iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

 	  Quote: 	
		  On 20/12/2020, at 6:51 AM, D McFadyean <ami-mcfadyean(at)talktalk.net> wrote:



ï»¿               

150Knts is a benefit when it comes to the annual (LAA) Permit Vne dive test!   



    	  Quote: 	
		      On 19 December 2020 at 14:26 David Watts <flydgw(at)gmail.com> wrote:     

     

         Jeroen,    

         

    

         At 1300 Lbs. before the weight upgrade we were restricted to 150 knots max speed.    

         

    

         Dave Watts    

         

                  On Sat, 19 Dec 2020 at 13:28, jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:        

      

       	  Quote: 	
		         --> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)>        

        

 So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around.        

        

 --------        

 Jeroen        

        

 http://www.europaowners.org/main.php?g2_itemId=44165        

        

        

        

        

 Read this topic online here:        

        

 http://forums.matronics.com/viewtopic.php?p=499734#499734        

        

        

        

        

        

        

 ===========        

 pa-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Europa-List        

 ===========        

 FORUMS -        

 eferrer" target="_blank">http://forums.matronics.com        

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 ===========        

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           -Matt Dralle, List Admin.        

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution        

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budyerly@msn.com

Joined: 05 Oct 2019
Posts: 288
Location: Florida USA

Posted: Sat Dec 19, 2020 1:18 pm Post subject: Spar Strap

Tim, 

Good catch.  This applies to the original trailer where the spars slid into the wing spar holder.  The XS trailers had a latch that opened and then closed and latched. 

  

Bud Yerly 

    

From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> On Behalf Of timward

 Sent: Saturday, December 19, 2020 4:10 PM

 To: europa-list(at)matronics.com

 Subject: Re: Europa-List: Re: Spar Strap 

 

 

  

If you trailer your aircraft then a modification will have to be done to the trailer wing spar holders to get the spar with the cap through. You will have to top hinge that spar holder. Two cents worth.  

Sent from my iPad  

Tim Ward 

  

12 Waiwetu Street,  

  

Fendalton,  

  

Christchurch, 8052 

  

New Zealand. 

  

ward.t(at)xtra.co.nz (ward.t(at)xtra.co.nz)  

  

021 0640221 

 

  



 

   	  Quote: 	
		   

On 20/12/2020, at 6:51 AM, D McFadyean <ami-mcfadyean(at)talktalk.net (ami-mcfadyean(at)talktalk.net)> wrote:   

ï»¿  

150Knts is a benefit when it comes to the annual (LAA) Permit Vne dive test! 

   	  Quote: 	
		   

On 19 December 2020 at 14:26 David Watts <flydgw(at)gmail.com (flydgw(at)gmail.com)> wrote:   

Jeroen,  

  

  

  

At 1300 Lbs. before the weight upgrade we were restricted to 150 knots max speed.  

  

  

  

Dave Watts  

  

    

On Sat, 19 Dec 2020 at 13:28, jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:  

  	  Quote: 	
		   

--> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> 

 

 So that would mean that if I stay below 1300, which shouldn't be a problem for the test phase, I would be OK? That would at least allow me to wait until some warmer weather comes around. 

 

 -------- 

 Jeroen 

 

 http://www.europaowners.org/main.php?g2_itemId=44165 

 

 

 

 

 Read this topic online here: 

 

 http://forums.matronics.com/viewtopic.php?p=499734#499734 

 

 

 

 

 

 

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 eferrer" target="_blank">http://forums.matronics.com 

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Sat Dec 19, 2020 5:19 pm Post subject: Re: Spar Strap

Hi Jeroin I remember reading of Nev's adventures sandbag loading original classic wing. It failed something like the spar flexed and slipped off the spar pin, I forget if it was before or after the center (I think wood) split. Anyway it failed and the process of offloading begun. Son of a gun when weight got down the spar snapped back into place. Hmm, he figured he would see how strong it was, I forget the details, don't think it made it to 2 Gs, but close. So you can take comfort when you perform a less than perfect Lomcovak on your Europa and fail the spar because you don't install spar strap, perhaps you can unload and land OK if you're gentle!  The pip pin with balls on one spar pin and spar strap for the other increases amount of load before failing wing. Just going from long term memory but pretty sure to the why. Ron P.

John Wighton

Joined: 18 May 2010
Posts: 241

Posted: Sun Dec 20, 2020 2:11 am Post subject: Re: Spar Strap

The drag, anti-drag beam is essential primary structure and the aircraft should not be flown without it.  



To do so you risk the lives of those on board and those located wherever the ensuing crash occurs.  



Would you fly without a fin?  



Impatience is a killer.  Finish the aircraft to spec and then go and enjoy it.

_________________
John Wighton
Europa XS trigear G-IPOD

jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Sun Dec 20, 2020 2:42 am Post subject: Re: Spar Strap

Thanks everybody for all the useful information and particularly Bud for once again coming to the rescue with really good instructions. When are you going to bundle and publish these? 

I take to heart the point about getting it finished properly. I haven't cut corners so far and agree this is probably not the best place to start. I will give the styrofoam idea a try- as soon as they will allow me into a shop to buy some... . Winter here is everything epoxy and I don't like: cool and very damp so I am sure that will make the difference between ending up with a strong part or a soggy mess.

_________________
Jeroen

http://www.europaowners.org/main.php?g2_itemId=44165

wdaniell.longport(at)gmai
Guest

Posted: Sun Dec 20, 2020 4:18 am Post subject: Spar Strap

Jeroen

Suggest a curing tent of plastic sheet with fan heaters.Â  I had to do this in bogota which has quite cold nights almost all year round.

Greenhouse plastic sheet...lots of spring clips (the ones for paper) and fan heaters with the aircraft spruce temperature cut out.

Will



William Daniell

+1 786 878 0246



On Sun, Dec 20, 2020, 05:44 jglazener <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "jglazener" <j.glazener14(at)gmail.com (j.glazener14(at)gmail.com)>

 

 Thanks everybody for all the useful information and particularly Bud for once again coming to the rescue with really good instructions. When are you going to bundle and publish these? 

 I take to heart the point about getting it finished properly. I haven't cut corners so far and agree this is probably not the best place to start. I will give the styrofoam idea a try- as soon as they will allow me into a shop to buy some... . Winter here is everything epoxy and I don't like: cool and very damp so I am sure that will make the difference between ending up with a strong part or a soggy mess.

 

 --------

 Jeroen

 

 http://www.europaowners.org/main.php?g2_itemId=44165

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=499749#499749

 

 

 

 

 

 

 ===========

 pa-List" rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/Navigator?Europa-List

 ===========

  FORUMS -

 eferrer noreferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer noreferrer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

 Â  Â  Â  Â  Â  -Matt Dralle, List Admin.

 rel="noreferrer noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

Rocketman

Joined: 07 Sep 2010
Posts: 87
Location: USA, Earth

Posted: Mon Dec 21, 2020 7:26 am Post subject: Spar Strap

Jeroen,



In the grand scheme of things, what's another 5 or 6 months?  Take the 

time to make sure your baby is 100%.  You want to be confident when the 

pucker factor sets in on first flight.



Just me two cents worth.



Jeff

N55XS



"Hate can be a destructive thing, especially when it clouds one's judgment"



-JB



On 12/20/2020 4:42 AM, jglazener wrote:

 	  Quote: 	
		   

 

 Thanks everybody for all the useful information and particularly Bud for once again coming to the rescue with really good instructions. When are you going to bundle and publish these?

 I take to heart the point about getting it finished properly. I haven't cut corners so far and agree this is probably not the best place to start. I will give the styrofoam idea a try- as soon as they will allow me into a shop to buy some... . Winter here is everything epoxy and I don't like: cool and very damp so I am sure that will make the difference between ending up with a strong part or a soggy mess.

 

 --------

 Jeroen

 

 http://www.europaowners.org/main.php?g2_itemId=44165

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=499749#499749

jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Mon Dec 21, 2020 8:44 am Post subject: Re: Spar Strap

Hello Bud, just make sure I understand everything correctly, you say the spars should be vertical, rather than the wings vertical which the manual seems to suggest. That would certainly make setting the wings up on simple sawhorses a lot easier. Rgds, Jeroen



 	  budyerly(at)msn.com wrote: 	
		  Just my two cents.

The spar strap prevents the spars from doing two things.

Bending back and impacting the aileron cross connect, twisting or separating.



As many have found on the original Classic, the spar cups took abuse.  Some of that due to poor security of the starboard tip by the 3/8 inch pin.  Some from the twisting of the spars under load, and some due to poor technique on installation and rigging.



With the GW increase testing, enlarging the pin to allow a pip pin to securely hold the spars firmly from creeping aft was a very thoughtful idea.  The spar strap really keeps the spars from bending which they do under load.  Remember, the XS short wing spar has no bid around it for a shear web, so the roves are good in vertical bending but not so great in twisting or bowing.  



So belts and suspenders.  Either enlarge the thickness of the spars with shear webbing as in the glider wing, or retain them seems to be the dilemma.  They chose simple, a spar strap.



I would always install a spar strap.  It aids rigging if built right with some clearance, reduces pressure on the spar cup during rigging, assists in keeping the spars safely put under high G pullouts.  



Take the time and do it right.  If you don't do it in construction, it may never get done.  In testing, if a situation requires a quick pull out, the added spar strap fixation may become a factor.  I try never to cut corners.  Anything worth doing is worth doing right.



Technique:

Support the wings and spars so the spars are exactly vertical, each wing is at the same incidence and the spar pins rotate easily.  This is important to ensure the strap is going to be properly aligned and not just slightly askew.  NEVER clamp the spars together to get alignment.



Wrap the starboard spar with blue painters tape then the release tape to give you a few thousands more room for rigging and more importantly derigging during construction.



Make the upper curved inlet  as shown but do the same on the lower on the starboard side of the cup layup to ease rigging.  I make my spar strap "ramp" about 1/4 inch larger than depicted as well as the strap to allow nice clean trimming.

Make your glass wrap as shown in the manual.

Wrap peel ply around your glass to prevent sagging and use some release tape to hold the peel ply from sagging if necessary.



In cold climates:

Try to find a shop that may let you do the work in the warm, but if that is impossible:

Make a box over the spars out of styrofoam and use an incandescent light to keep it warm to cure.



Once cured, if heat treat is necessary pull apart the wings and heat treat slowly in the garage.



The spar strap when done properly is an excellent aid in rigging as well.  As the starboard spar is inserted, it is aligned with the strap and will slide along the port spar and assist in self alignment.  The spars stay properly vertical, assisting the wing tip assistant.  If the builder also installs a rigging aid for the spar to slide on and assist in alignment,(keeping the spar from sliding aft) and building a small ramp on the spar root to assist lifting the spar as it hits the cup and thereby aligning the pins to very near their required elevation, even the most clumsy of assistants even without a saw horse or trestle under the wing will be amazed how easy the rig is.



Best Regards,

Have a great holiday..  Bud Yerly

_________________
Jeroen

http://www.europaowners.org/main.php?g2_itemId=44165

budyerly@msn.com

Joined: 05 Oct 2019
Posts: 288
Location: Florida USA

Posted: Mon Dec 21, 2020 7:16 pm Post subject: Spar Strap

Jeroen,

I whacked this out this evening.  It is a bit rough but gives a bit more detail.

You can mount the wings vertical like the book or horizontal.  It is imperative that you make sure the wings are at the same angle so the spars are dead parallel in their vertical orientation.  Take a look at the .pdf I'm attaching.  I hope it is a bit clearer.  It also has a few other things to consider.



Best Regards,

Bud Yerly



--

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jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Tue Dec 22, 2020 8:58 am Post subject: Re: Spar Strap

Hello Bud, you just "whacked this out"... Fantastic! Now I have no more excuses to not get off my butt and get the job done. All the shops are closed here until the 19th but that gives me some time to internalise all this information and make sure I have a running start! Thanks again, Jeroen

_________________
Jeroen

http://www.europaowners.org/main.php?g2_itemId=44165

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